AS3661 [AMSCO]
Programmable 9-channel LED Dr iver; 可编程的9通道LED医生IVER
| 型号： | AS3661 |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | Programmable 9-channel LED Dr iver |
| 文件： | 总87页 (文件大小：3127K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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ams AG
The technical content of this austriamicrosystems datasheet is still valid.
Contact information:
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ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: ams_sales@ams.com
Please visit our website at www.ams.com
Datasheet
AS3661
Programmable 9-channel LED Driver
1 General Description
2 Key Features
ꢀ
Three independent program execution engines; 9
programmable outputs with 25.5 mA full-scale
current, 8- bit current setting resolution and 12-bit
PWM control resolution
The AS3661 is a 9-channel LED driver designed to
produce lighting effects for mobile devices. A high-
efficiency charge pump enables LED driving over full Li-
Ion battery voltage range. The device is equipped with
an internal program memory, which allows operation
without processor control. The AS3661 maintains
excellent efficiency over a wide operating range by
autonomously selecting the best charge pump gain
based on LED forward voltage requirements. AS3661 is
able to automatically enter power-save mode when LED
outputs are not active, thus lowering idle current
consumption down to 10 µA (typ).
ꢀ
ꢀ
Adaptive charge pump with 1x and 1.5x gain
provides up to 95% LED drive efficiency
Charge pump with soft start and overcurrent/short
circuit protection
ꢀ
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ꢀ
Built-in LED test
Automatic power save mode; IVDD = 10 µA (typ.)
Two wire, I2C-compatible, ntrol nterface
Flexibinstruction set
The AS3661 has an I2C-compatible control interface
with four pin selectable addresses. Also, the device has
a flexible General Purpose Output (GPO), which can be
used as a digital control pin for other devices. INT pin
can be used to notify processor when a lighting
sequence has ended (interrupt - function). Also, the
device has a trigger input interface, which allows
synchronization between multiple devices.The deice
requires only four small and low-cost ceramic
capacitors.
Large SRAM program memory
Small applicaticircuit
Source (high sde) drivers
Minimum number of external components
Archture supports color control
The AS3661 is available in a tiny WL-CS-25
(2.285x2.285mm) 0.4mm pitch packag.
3 Applications
Te product is ideal for fun and indicator lights, LED
backlighting, and programmable current source.
Figure 1. AS3661 LED Driver Block Diagram
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AS3661
Datasheet
Contents
1 General Description ............................................................................................................................1
2 Key Features .......................................................................................................................................1
3 Applications ........................................................................................................................................1
4 Pinout ...................................................................................................................................................5
4.1 Pin Assignment ..............................................................................................................................................5
4.2 Pin Description ..............................................................................................................................................5
5 Absolute Maximum Ratings ...............................................................................................................7
6 Electrical Characteristics .................................................................................................................
7 Typical Operating Characteristics ..................................................................................................12
8 Detailed Description .......................................................................................................................14
8.1 Programming ............................................................................................................................................14
8.2 LED Error Detection ..................................................................................................................................14
8.3 Energy Efficiency ...................................................................................................................................14
8.4 Temperature Compensation .................................................................................................................14
8.5 Modes of Operation ............................................................................................................................16
8.5.1 RESET ......................................................................................................................................16
8.5.2 STANDBY ......................................................................................................................................16
8.5.3 STARTUP ........................................................................................................................................16
8.5.4 NORMAL ...........................................................................................................................................16
8.5.5 POWER SAVE .............................................................................................................................16
8.6 Charge Pump Operational Descriptn .................................................................................................17
8.6.1 Overview ........................................................................................................................................17
8.6.2 Output Resistance ........................................................................................................................17
8.6.3 Controlling the Charge mp ......................................................................................................18
8.6.4 LED Forward Voltage Monitoring ...............................................................................................18
8.6.5 Gain Change Hysteresis ....................................................................................................................18
8.6.6 Automatic Power Save Mode ............................................................................................................19
8.6.7 PWM Power Save Mode ....................................................................................................................19
8.7 LED Driver Operational Descriptin ...........................................................................................................20
8.7.1 Powering LEDs ..............................................................................................................................21
8.7.2 Controlling the Hig-side LED Drivers ..................................................................................................21
8.8 I2C Compatible Contrl Interface .................................................................................................................22
8.8.1 I2C Address selecton ...........................................................................................................................22
8.8.2 Bus Not Bsy .......................................................................................................................................22
8.8.3 SarDaa Transfer ...............................................................................................................................22
8.8.4 Stop Data Transfer ...............................................................................................................................22
8.8.Data Valid .............................................................................................................................................22
8.8.6 cknowledge ........................................................................................................................................22
8.7 Program Downloading ..........................................................................................................................25
8.9 Register Set .................................................................................................................................................25
8.0 Control Register Details .............................................................................................................................35
8.10.1 ENABLE/ ENGINE CONTROL1 .........................................................................................................35
8.10.2 ENGINE CNTRL2 ..............................................................................................................................36
8.10.3 OUTPUT DIRECT/RATIOMETRIC MSB and LSB .............................................................................37
8.10.4 OUTPUT ON/OFF CONTROL MSB and LSB ....................................................................................38
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AS3661
Datasheet
8.10.5 LEDx Control ......................................................................................................................................39
8.10.6 LEDx PWM .........................................................................................................................................45
8.10.7 LEDx CURRENT CONTROL .............................................................................................................48
8.10.8 MISC ..................................................................................................................................................51
8.10.9 ENGINEx PC ......................................................................................................................................52
8.10.10 STATUS/INTERRUPT .....................................................................................................................52
8.10.11 GPO .................................................................................................................................................54
8.10.12 VARIABLE ........................................................................................................................................54
8.10.13 RESET .............................................................................................................................................54
8.10.14 TEMP ADC CONTROL .................................................................................................................55
8.10.15 TEMPERATURE READ ...............................................................................................................
8.10.16 TEMPERATURE WRITE .............................................................................................................
8.10.17 LED TEST CONTROL .................................................................................................................56
8.10.18 LED TEST ADC ..........................................................................................................................57
8.10.19 ENGINE1 VARIABLE A .............................................................................................................58
8.10.20 ENGINE2 VARIABLE A ...............................................................................................................58
8.10.21 ENGINE3 VARIABLE A ..........................................................................................................58
8.10.22 MASTER FADER1 ..................................................................................................................58
8.10.23 49 MASTER FADER2 ...........................................................................................................59
8.10.24 4A MASTER FADER3 .............................................................................................................59
8.10.25 ENG1 PROG START ADDR .....................................................................................................59
8.10.26 ENG2 PROG START ADDR .....................................................................................................59
8.10.27 ENG3 PROG START ADDR .......................................................................................................59
8.10.28 PROG MEM PAGE SELECT ..................................................................................................60
8.10.29 ENG1 MAPPING MSB .........................................................................................................60
8.10.30 71H ENG1 MAPPING SB .........................................................................................................60
8.10.31 ENG2 MAPPING MB ..............................................................................................................61
8.10.32 ENG2 MAPPING LS.................................................................................................................61
8.10.33 ENG3 MAPPING MSB ..........................................................................................................61
8.10.34 ENG3 MAPPING LSB ...................................................................................................................62
8.10.35 GAIN CHANGE CTRL ..................................................................................................................63
8.11 Instruction Set ..........................................................................................................................................64
8.12 LED Driver Instructions ..........................................................................................................................67
8.12.1 RAMP (Numerical Opera) ............................................................................................................67
8.12.2 RAMP (Variables..............................................................................................................................68
8.12.3 SET PWM (Nmecal Operands) ......................................................................................................69
8.12.4 SET PWM Varibles) ........................................................................................................................70
8.12.5 WAIT .............................................................................................................................................70
8.13 LED MappinInstuctions ..........................................................................................................................71
8.13.1 MUX_LD_START ...............................................................................................................................71
8.132 MUX_LD_END ...................................................................................................................................71
8.13.3 MUX_MAP_START ............................................................................................................................72
13.4 MUX_SEL ..........................................................................................................................................72
8.13.5 MUX_CLR ..........................................................................................................................................72
8.13.6 MUX_MAP_NEXT ..............................................................................................................................73
8.13.7 MUX_MAP_PREV ..............................................................................................................................73
8.13.8 MUX_LD_NEXT .................................................................................................................................74
8.13.9 MUX_LD_PREV .................................................................................................................................74
8.13.10 MUX_MAP_ADDR ...........................................................................................................................74
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AS3661
Datasheet
8.13.11 MUX_LD_ADDR ..............................................................................................................................74
8.14 Branch Instructions ....................................................................................................................................75
8.14.1 RST ....................................................................................................................................................75
8.14.2 BRANCH (Numerical) ........................................................................................................................75
8.14.3 BRANCH (Variables) ..........................................................................................................................76
8.14.4 INT .....................................................................................................................................................76
8.14.5 END ....................................................................................................................................................76
8.14.6 TRIGGER ...........................................................................................................................................76
8.14.7 JNE/JL/JGE/JE ..................................................................................................................................7
8.15 Arithmetic Instructions ...............................................................................................................................78
8.15.1 LD ......................................................................................................................................................
8.15.2 ADD (Numerical Operands) .............................................................................................................8
8.15.3 ADD (Variables) ..............................................................................................................................78
8.15.4 SUB (Numerical) ..............................................................................................................................79
8.15.5 SUB (Variables) .............................................................................................................................79
9 Typical Application .........................................................................................................................81
9.1 Recommended External Components ....................................................................................................82
10 Package Drawings and Markings ............................................................................................83
11 Ordering Information .................................................................................................................84
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AS3661
Datasheet - Pinout
4 Pinout
4.1 Pin Assignment
Figure 2. Pin Assignments (Top View)
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4.2 Pin Description
Table 1. Pin Description for AS3661
Pin Number
Pin Name
LED1
LED2
VCP
Desription
LED1 Ouut. Current source froVCP.
A1
A2
A3
A4
A5
B1
B2
B3
B4
B5
C1
C2
C3
C4
C
D1
D2
LED2 Otput. Current source om VCP.
ChargPump output. short connection to capacitor CVCPOUT.
Charge Pump flyig capacitor 2. make a short connection to capacitor CFLY2.
Charge Pump flyincpacitor 2. make a short connection to capacitor CFLY2.
LED3 OutpuCurrent source from VCP.
C2-
C2+
LED3
LED4
ASEL1
C1-
LED4 Outt. Current source from VCP.
Digital int - I²C address select
Chrge Pump flying capacitor 1. make a short connection to capacitor CFLY1.
Carge Pump flying capacitor 1. make a short connection to capacitor CFLY1.
LED5 Output. Current source from VCP.
C1+
LED5
LED
ASEL0
EN
LED6 Output. Current source from VCP.
Digital input - I²C address select
Enable. Active high digital input.
Positive Power Supply Input
VBAT
LED7
LED8
LED7 Output. Current source from VBAT.
LED8 Output. Current source from VBAT.
Interrupt Output. Open drain digital output for microcontroller unit, leave
unconnected if not used.
D3
D4
INT
Digital Clock Input. Connect a 32kHz signal; if this signal is not available, connect
this pin to GND.
CLK32K
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AS3661
Datasheet - Pinout
Table 1. Pin Description for AS3661
Pin Number
Pin Name
GND
Description
Ground
D5
E1
E2
E3
E4
E5
LED9 Output. Current source from VBAT.
General Purpose Output. Leave unconnected if not used.
Trigger Input. Open drain, connect to ground if not used.
Serial-Data I/O. Open drain digital I/O I²C data pin.
Serial-Clock Input
LED9
GPO
TRIG
SDA
SCL
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AS3661
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Table 3. Electrical
Characteristics on page 8 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
VBAT, VCP, C1+, C1-, C2+, C2- to GND
VCP to VBAT
Min
-0.3
-0.3
-0.3
Max
Units
Comments
+7.0
V
V
V
Diode between VCP and VBAT
LED1, LED2....LED9 to GND
+7.0
+7.0
SDA, SCL, EN, CLK32K, TRIG, INT, GPO,
ASEL0, ASEL1 to GND
-0.3
V
Electrostatic Discharge
ESD HBM (LED1 to LED2)
8
2.5
250
1
kV
kV
JEDEC JESD2-A114
ESD HBM (all other pins)
ESD MM
JEDEC JSD22-A115
JEDEC ESD22-C101
ESD CDM
k
Temperature Ranges and Storage Conditions
Continous Power Dissipation
Intenally limited (overtemperature
protection)1
Junction Temperature (TJMAX
)
+125
+125
+260
ºC
ºC
Storage Temperature Range
-55
Body Temperature during Soldering
Junction to Ambient Thermal Resistane
(θJA)2
IPC/JEDEC J-STD-020
87
°C/W
Represents a max. floor life time of
Moisture Sensitive Level
unlimited
Recommended Operating Conditions
Recommended charge pump load current
0
100
mA
1. Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages
at TJ = 150°C (typ.) and disengages at T = 130°C (typ.).
2. Junction to ambient thermal resistance ighly application and board-layout dependent. In applications where
high maximum power dissipation exists, special care must be paid to thermal dissipation issues in board
design.
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AS3661
Datasheet - Electrical Characteristics
6 Electrical Characteristics
VBAT = 3.6V, VEN = 1.65V, CBAT = CVCPOUT = 1.0µF, CFLY1-2 = 0.47µF, TAMB = -30ºC to +85ºC, typical values @ TAMB =
+25ºC (unless otherwise specified)1.
Table 3. Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
General Operating Conditions
VBAT
IVBAT
Supply Voltage
2.7
5.5
4
V
Standby supply
current
EN = 0V or CHIP_EN=0 (bit), external 32 kHz
clock running or not running
1.4
µA
External 32 kHz clock running, charge pump
and current source outputs disabled
0.16 0.22
0.16 0.22
1.4
mA
mA
mA
Normal Mode supply
current
Charge pump in 1x mode, no load, current
source outputs disabled
Charge pump in 1.5x mode, no load, current
source outputs disabled
External 32 kHz clck running
Internal oscillatr runnig
TA= +25ºC
3.1
5
µA
Power Save Mode
supply current
0.16 0.23
mA
-4
-7
+4
+7
Internal Oscillator
Frequency Accuracy
fOSC
%
°C
Operating
TAMB
-30
25
85
Temperature1
Charge Pump
Gain = 1.5 and VBA= 2.9V
Gain = 1 and VBA= 2.9V
Gain = 1.5 and BAT = 3.6V
Gain = VBAT = 3.6V
6
1
Charge Pump Output
Resistance
ROUT
Ω
1.4
1
fSW
Switching Frequency
Ground current
1.2
1.25
1.2
1
1.3
MHz
mA
µA
Gain = 1.5
Gain = 1
IGND
VCP Turn-On Time2
VBAT = 3.6V, IOUT = 60 mA
tON
100
µs
Charge Pump loa
current
ILOAD
Recommended charge pump load current
0
100
1
mA
LED Driver
LeakagCurrnt
(LED1 to ED9)
ILEAK
IMAX
PWM = 0%
0.1
µA
Mimum Source
Current
Outputs LED1 to LED9
25.5
mA
TAMB = +25ºC -2.5%
-5
+2.5%
+5
Output Current3
Accuracy
Output Current set to 17.5
mA
IOUT
%
IMATCH
fLED
Matching
Output Current set to 17.5 mA
1
2.5
%
LED Switching
Frequency
312
Hz
Saturation Voltage4
mV
VSAT
Output Current set to 17.5 mA
45
100
LED Test
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AS3661
Datasheet - Electrical Characteristics
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
Typ
Max
±4
5
Unit
LSB
Least Significant Bit
30
mV
Total Unadjusted
Error5
EABS
VIN_TEST = 0V to VBAT
<±3
2.7
LSB
tCONV
Conversion Time
DC Voltage Range
ms
V
VIN_TEST
0
Logic Interface
Logic Input EN
VIL
VIH
IIN
Input Low Level
Input High Level
Input Current
0.5
1.0
V
V
1.2
-1.0
µA
Input Delay6
tDELAY
2
µs
V
Logic Input SCL, SDA, TRIG, CLK32K, ASEL0, ASEL1
0.2x
VEN
VIL
Input Low Level
0.8x
VEN
VIH
IIN
Input High Level
Input Current
V
-1.0
1.0
µA
Logic Output SDA, TRIG, INT
VOL
IL
Output Low Level
IOU= 3 mA (pull-up cur)
VCP = 2.8
0.3
0.3
0.5
1.0
V
Output Leakage
Current
µA
Logic Output GPO
VOL
Output Low Level
IO= 3 mA
IO-2 mA
0.5
1.0
V
V
VBAT - VBAT -
VOH
Output High Level
0.5
0.3
Output Leakage
Current
IL
VCP = 2.8V
µA
Logic Input CLK32K
fCLK
fCLKH
fCLKL
tR
Clock Frequency
32.7
kHz
µs
High Time
Low Time
6
6
µs
Clock Rise ime
Clock FaTime
10 to 90%
90 to 10%
2
2
µs
tF
µs
1. In applications whre high power dissipation and/or poor package thermal resistance is present, the maximum
ambient teperature may have to be derated. Maximum ambient temperature (TAmb-MAX) is dependent on the
maximum oeraing junction temperature (TJ-MAX =125°C), the maximum power dissipation of the devi ce in the
applicn (PD-MAX) and the junction to ambient thermal resistance of the part/package in the application (θJA) as
given the following equation: TAmb-MAX = TJ-MAX - (θJA * PD-MAX ).
2. Trn-on time is measured from the moment the charge pump is activated until the VCP crosses 90% of its target
value
1. Low-ESR Surface-Mount Ceramic Capacitors 8MLCCs) used in setting electrical characteris-
tics.
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AS3661
Datasheet - Electrical Characteristics
3. Output current accuracy is the difference between actual value of the output current and programmed value of
this current. IMATCH is determined as follows:
For the constant current D1 to D9, the following are determined: The maximum current (max) and the minimum
current (min), then the IMATCH is calculated with: IMATCH = 100*(((max-min)/2)+((max+min)/2))/((max+min)/2)-
100
4. Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured
at VCP - 1V.
5. Total unadjusted error includes offset, full-scale and linearity errors.
6. The I2C host should allow at least 500µs before sending data the AS3661after the rising edge of the enable
line.
Figure 3. I2C mode Timing Diagram
SDA
tBUF
tLOW
t:STA
tR
tF
SCL
tHD:STA
tSU:STO
tSU:STA
tHD:DAT
tHIGH
tSU
REPEATED
START
STOP START
.
Table 4. Electrical Characteristics IC1
Symbol Paramete
I2C mode timings - see Figre 3 on page 10
Condition
Min
Typ
Max
Unit
fSCLK
SCL Clock Fequency
0
400
kHz
µs
s Fre Time
Betwen a STOP and
START Condition
tBUF
1.3
Hold Time (Repeated)
START Condition2
tHD:S
0.6
µs
LOW Period of SCL
Clock
OW
tHIGH
1.3
0.6
µs
µs
HIGH Period of SCL
Clock
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AS3661
Datasheet - Electrical Characteristics
Table 4. Electrical Characteristics (Continued)I2C1
Symbol
Parameter
Condition
Min
Typ
Max
Unit
Setup Time for a
Repeated START
Condition
tSU:STA
0.6
µs
Data Hold Time3
Data Setup Time4
tHD:DAT
tSU:DAT
tR
tF
tSU:STO
CB
50
ns
ns
100
20 +
0.1CB
Rise Time of Both
SDA and SCL Signals
300
300
ns
ns
µs
ns
pF
15+
0.1CB
Fall Time of Both SDA
and SCL Signals
Setup Time for STOP
Condition
0.6
10
Capacitive Load for
Each Bus Line
Load of one Picofarad corresponds to one
nanosecond.
20
10
I/O Capacitance
(SDA, SCL)
CI/O
1. Specification is guaranteed by design and is not tested production. VEN = 1.65V to VBAT.
2. After this period the first clock pulse is generated.
3. A device must internally provide a hold time of at least 30ns for the SDA signal (rferred to the VIHMIN of the
SCL signal) to bridge the undefined region of the falling edge of SCL.
4. A fast-mode device can be used in a standard-oe ystem, but the requireent tSU:DAT = to 250ns must then
be met. This is automatically the case if the dvice does not stretch tLOW period of the SCL signal. If such a
device does stretch the LOW period of the SCL ignal, it must out the next data bit to the SDA line tR max +
tSU:DAT = 1000 + 250 = 1250ns before he SL line is release.
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AS3661
Datasheet - Typical Operating Characteristics
7 Typical Operating Characteristics
VBAT = 3.6V, VEN = 1.65V, CBAT = CVCPOUT = 1.0µF, CFLY1-2 = 0.47µF, TAMB = +25ºC, unless otherwise specified
Figure 4. Charge Pump 1.5 x Efficiency vs. Load
Figure 5. Output Voltage vs. Load Current (1.5 x CP)
Figure 6. Gain Change Hysteresis Loop (6x1mA load)
ure 7. Effect of adaphyst. on width of hyst. loop
6 x LED Multicomp OVS-601
6 x LED Multicomp OVS-0601
Figure 8. LED Current matching istribution @17.5mA
Figure 9. LED current Accuracy distribution @17.5mA
Total count: 610 parts
Total count: 610 parts
60
70
0
0
−1
0
1
−2
0
2
%
%
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AS3661
Datasheet - Typical Operating Characteristics
Figure 10. Power Save Mode Supply Current vs.
VBAT, Charge Pump in 1x mode
Figure 11. Serial Bus Write and Charge Pump Start-
up, ILOAD = 60mA
200
internal CLK
external CLK
150
100
50
0
2,7
3,1
3,5
3,9
VBAT [V]
4,3
4,7
5,1
5,5
25µs/Div
Figure 12. Line Trans. and Charge Pump autom. Gain
Change 1.5 to 1, 6LEDs@1mA 100% PWM
Figur13. Lie Trans. and Charge Pump autom. Gain
Cange 1 to 1.5, 6EDs@1mA 100% PWM
3.6V
3.6V
2.8V
2.8V
4V
4.65V
3.6V
4.2V
3.8V
2.5ms/Div
2.5ms/Div
Figure 14. 100% PWM RGB LED fficincy vs. VBAT
Figure 15. 100% PWM WLED Efficiency vs. VBAT
3 x LED Osram LRTB Y3SG
6 x LED Multicomp OVS-0601
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AS3661
Datasheet - Detailed Description
8 Detailed Description
The AS3661 is a fully integrated lighting management unit for producing lighting effects for mobile devices. The
AS3661 includes all necessary power management, high-side current sources, temperature compensation, two wire
control interface and programmable pattern generators. The overall maximum current for each driver is set by an 8-bit
register. The AS3661 controls LED luminance with a pulse width modulation (PWM) scheme with a resolution of 12
bits. The temperature compensation is also done by a PWM.
8.1 Programming
The AS3661 provides flexibility and programmability for dimming and sequencing control. Each LED can be controlled
directly and independently through the serial bus or LED drivers can be grouped together for pre-programmed flashing
patterns. The AS3661 has three independent program execution engines, so it is possible to form three independenty
programmable LED banks. LED drivers can be grouped based on their function so that, for example, the first bank o
drivers can be assigned to the keypad illumination, the second bank to the “funlights” and the third group to the
indicator LED(s). Each bank can contain 1 to 9 LED driver outputs. Instructions for program execution engines e
stored in the program memory. The total amount of the program memory is 96 instructions and the user can allocate
the memory as required by the engines.
8.2 LED Error Detection
AS3661 has a built-in LED error detection. Error detection does nt only detect open and shocircu, but provides an
opportunity to measure the VF’s of the LEDs. The test event is acvated a serial interface write and the result can be
read through the serial interface during the next cycle. This featucan lso be addressd to easure the voltage on
VBAT, VCP and INT pins. Typical example usage includes nitoring battery voltage or using INT pin as a light sensor
interface.
8.3 Energy Efficiency
When charge pump automatic mode selection is eabled, the AS3661 monitorthe voltage over the drivers of LED1 to
LED6 so that the device can select the best charge pump gain and man good efficiency over the whole operating
voltage range. The red LED element of an RGB ED typically has a forrd voltage of about 2V. For that reason, the
outputs LED7, LED8 and LED9 are internally owered by VBAT, sincbattery voltage is high enough to drive red LEDs
over the whole operating voltage range. Tis allows to drive thee RGB LEDs with good efficiency because the red
LEDs doesn't load the charge pumpA661 is able to automtically enter power-save mode, when LED outputs are
not active and thus lowering idle curreonsumption doo 10 µA (typ.). During the “downtime” of the PWM cycle
(constant current output status is low) additional power s can be achieved when the PWM power save feature is
enabled.
8.4 Temperature Compensation
The luminance of an LED is typically a functin of its temperature even though the current flowing through the LED
remains constant. Since luminance is temeratre dependent, many LED applications require some form of
temperature compensation to decrease luance and color purity variations due to temperature changes. The
AS3661 has a build in temperature sensing element and PWM duty cycle of the LED drivers changes linearly in
relationship to changes in temperureUser can select the slope of the graph (31 slopes) based on the LED
characteristics. This compensaon can be done either constantly, or only right after when the device wakes up from
power save mode, to avoid eror due to self-heating of the device. Linear compensation is considered to be practical
and accurate enough for ost LED applications. Compensation is effective over the temperature range from -40°C to
+90°C.
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AS3661
Datasheet - Detailed Description
Figure 16. Temperature Compensation Principle
100
75
50
M ax. Slope
Value
25
No
compensation
M in. Slope Value
0
-50
-25
0
25
50
75
100
Temperature [°C]
Figure 17. AS3661 - Block Diagram
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AS3661
Datasheet - Detailed Description
8.5 Modes of Operation
The following are the different modes of operation of AS3661
8.5.1 RESET
In the RESET mode all the internal registers are reset to the default values. Reset is entered always if Reset Register
(3DH) is written FFH or internal Power On Reset is active. Power On Reset (POR) will activate during the chip startup
or when the supply voltage VBAT fall below 1.5V (typ.). Once VBAT rises above 1.5V (typ.) POR will be inactivate and
the chip will continue to the STANDBY mode. CHIP_EN control bit is low after POR by default.
8.5.2 STANDBY
The STANDBY mode is entered if the register bit CHIP_EN or EN pin is logic low and Reset is not active. This is the
low power consumption mode, when all circuit functions are disabled. Registers can be written in this mode if EN pn
logic high so that the control bits will be effective right after the start up.
8.5.3 STARTUP
When CHIP_EN bit is written high and the EN pin is high, the INTERNAL STARTUP SEQUENCE powrs up all the
needed internal blocks (VREF, Bias, Oscillator etc.). Startup delay is 500 µs. If the chip temperature ises oo high, the
Thermal Shutdown (TSD) disables the chip operation and chip waits in STARTUP mode until no herml shutdown
event is present.
8.5.4 NORMAL
During NORMAL mode the user controls the chip using thontrol Registers.
8.5.5 POWER SAVE
In POWER SAVE mode analog blocks are disabled to minimize power consmptin. (see Automatic Power Save
Mode on page 19)
Figure 18. Mode Select
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AS3661
Datasheet - Detailed Description
8.6 Charge Pump Operational Description
8.6.1 Overview
The AS3661 includes a pre-regulated switched-capacitor charge pump with a programmable voltage multiplication of 1
and 1.5x. In 1.5x mode by combining the principles of a switched-capacitor charge pump and a linear regulator, it
generates a regulated 4.5V output from Li-Ion input voltage range. A two-phase non-overlapping clock generated
internally controls the operation of the charge pump. During the charge phase, both flying capacitors (CFLY1 and CFLY2)
are charged from input voltage. In the pump phase that follows, the flying capacitors are discharged to output. A
traditional switched capacitor charge pump operating in this manner will use switches with very low on-resistance,
ideally 0Ω, to generate an output voltage that is 1.5x the input voltage. The AS3661 regulates the output voltage by
controlling the resistance of the input-connected pass-transistor switches in the charge pump.
Figure 19. Charge Pump
CFLY1
CFLY2
C1-
C2-
C1+
C2+
Low Noise
Charge Pump
VBAT
VBAT
VCP
CBAT
1:1, 1:1.5 Modes
CVCPOUT
_max_5V4
Voltage limit
V
5V
LED1
LE
up
down
Mode
Switching
LED9
8.6.2 Output Resistance
At lower input voltages, the charge puoutput voltage degrade due to effective output resistance (ROUT) of the
charge pump. The expected voltage drop can be calculay using a simple model for the charge pump illustrated in
Figure 20 below.
Figure 20. Charge Pump Output Resistanc
Rout
Vcp
Vin
V
1.5x V
REG
1.5x
The model showa iner pre-regulation block (REG), a voltage multiplier (1.5x), and an output resistance (ROUT). The
output resistance mdels the output voltage drop that is inherent to switched capacitor converters. The output
resistance is .5Ω (typ.), and it is a function of switching frequency, input voltage, flying capacitors’ capacitance value,
internal resistnceof the switches and ESR of the flying capacitors. When the output voltage is in regulation, the
regulatohe model controls the voltage V to keep the output voltage equal to 4.5V (typ.). With increased output
curent, e vltage drop across ROUT increases. To prevent drop in output voltage, the voltage drop across the
reglator is reduced, V increases, and VCP remains at 4.5V. When the output current increases to the point that there
is zervoltage drop across the regulator, V equals the input voltage, and the output voltage is “on the edge” of
regulation. Additional output current causes the output voltage to fall out of regulation, so that the operation is similar to
a basic open-loop 1.5x charge pump. In this mode, output current results in output voltage drop proportional to the
output resistance of the charge pump. The out-of-regulation output voltage can be approximated by:
VCP = 1.5 x VIN – IOUT x ROUT.
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AS3661
Datasheet - Detailed Description
8.6.3 Controlling the Charge Pump
The charge pump is controlled with two CP_MODE bits in MISC register (address 36H). When both of the bits are low,
the charge pump is disabled and the output voltage is pulled down with an internal 300 kΩ (typ.) resistor. The charge
pump can be forced to bypass mode, so that the battery voltage is connected directly to the current sources. In 1.5x
mode the output voltage is boosted to 4.5V. In automatic mode the charge pump operation mode is determined by
saturation of constant current drivers, like described in chapter LED Forward Voltage Monitoring.
8.6.4 LED Forward Voltage Monitoring
When the charge pump automatic mode selection is enabled, the voltages over the LED drivers LED1 to LED6 are
monitored.
Note: Power input for current source outputs LED7, LED8 and LED9 are internally connected to the VBAT pin.
If the LED1 to LED6 drivers do not have enough headroom, the charge pump gain is set to 1.5x. Driver saturaton
monitor does not have a fixed voltage limit, since saturation voltage is a function of temperature and current. Th
charge pump gain is set to 1x, when the battery voltage is high enough to supply all LEDs. In automatic gain chnge
mode, the charge pump is switched to bypass mode (1x), when LEDs are inactive for over 50 ms.
8.6.5 Gain Change Hysteresis
The charge pump gain control utilizes digital filtering to prevent suply voltage disturbances (exaple, the transient
voltage on the power supply during the GSM burst) from triggerg unneessary gain changes. ysteresis is provided
to prevent periodic gain changes, which would occur due to LED iver ad charge pump voltae drop in 1x mode. The
hysteresis of the gain change is user configurable, defaultting is factory programmable. Flexible configuration
ensures, that the hysteresis can be minimized or set to deleel in each appation. LED forward voltage
monitoring and gain control block diagram is shown in Figur21.
Figure 21. Forward Voltage Monitoring and Gain Control Block
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AS3661
Datasheet - Detailed Description
8.6.6 Automatic Power Save Mode
Automatic power save mode is enabled when POWERSAVE_EN bit in register address 36H is ‘1’. Almost all analog
blocks are powered down in power save, if an external clock signal is used. Only the charge pump protection circuits
remain active. However, if the internal clock has been selected, only charge pump and LED drivers are disabled during
the power save; the digital part of the LED controller needs stay active. In both cases the charge pump enters to the
weak 1x mode. In this mode the charge pump utilizes a passive current limited keep-alive switch, which keeps the
output voltage at the battery level. During the program execution AS3661 can enter power save if there is no PWM
activity in any of the LED driver outputs. To prevent short power save sequences during program execution, AS3661
has an instruction look-ahead filter. During program execution engine 1, engine 2 and engine 3 instructions are
constantly analyzed, and if there is time intervals of more than 50ms in length with no PWM activity on LED driver
outputs, the device will enter power save. In power save mode program execution continues uninterruptedly. When an
instruction that requires PWM activity is executed, a fast internal startup sequence will be started automatically.
8.6.7 PWM Power Save Mode
PWM cycle power save mode is enabled when register 36 bit [2] PWM_PS_EN is set to '1'. In PWM power save ode
analog blocks are powered down during the "down time" of the PWM cycle. Blocks that are powered down depends
whether external or internal clock is used. While the Automatic Power Save Mode (see above) saes eergy when
there is no PWM activity at all, the PWM Power Save mode saves energy during PWM cycles. Like te Automatic
Power Save Mode, PWM Power Save Mode works also during program execution.
Figure 22. PWM Powersave Principle with external clock (VDD =3.6V, 0% PWM, ILED9=5mA)
INPUT CURRENT ~35µ
DURING PWM POWES
1ms/Div
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AS3661
Datasheet - Detailed Description
8.7 LED Driver Operational Description
AS3661 LED drivers are constant current sources. The output current can be programmed by control registers up to
25.5 mA. The overall maximum current is set by 8-bit output current control registers with 100 µA step size. Each of the
9 LED drivers has a separate output current control register. The LED luminance pattern (dimming) is controlled with
PWM (pulse width modulation) technique, which has internal resolution of 12 bits (8-bit control can be seen by user).
PWM frequency is 312 Hz (see Figure 23 on page 20).
Figure 23. LED Pattern and Current Control Principle
LED dimming is controlled according to a logarithmic or lineascale(see Figue 2). Logarithmic or linear scheme can
be set for both the program execution engine contol and direct PWM control.
Figure 24. Logarithmic vs. Linear Dimming
100
95
linear PWM
90
logarithmic PWM
85
8
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0
64
128
192
256
Dimming Control [DEC]
Note: If the emperature compensation is active, the maximum PWM duty cycle is limited to 50% at +25°C. This is
requireto allow enough headroom for temperature compensation over the whole temperature range -40 °C to
.
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AS3661
Datasheet - Detailed Description
8.7.1 Powering LEDs
Although the AS3661 is very suitable for white LED and general purpose applications, it is particularly well suited to
use with RGB LEDs. The AS3661 architecture is optimized for use with three RGB LEDs. Typically, the red LEDs have
forward voltages below 2V and thus red LEDs can be powered directly from VBAT. In AS3661 the LED7, LED8 and
LED9 drivers are directly powered from the battery voltage (VBAT), not from the charge pump output. The LED1 to
LED6 drivers are internally connected to the charge pump output and these outputs can be used for driving green and
blue (VF = 2.7V to 3.7V) or white LEDs. Of course, LED7, LED8 and LED9 outputs can be used for green, blue or white
LEDs if the VBAT voltage is high enough. An RGB LED configuration example is given in the Typical Applications
section.
8.7.2 Controlling the High-side LED Drivers
ꢀ
Direct PWM Control
All AS3661 LED drivers, LED1 to LED9, can be controlled independently through the two-wire serial I²C cmpa
ble interface. For each high-side driver there is a PWM control register. Direct PWM control is active by defult.
ꢀ
Controlling by Program Execution Engines
Engine control is used when the user wants to create programmed sequences. The program ecutin engine has
higher priority than direct control registers. Therefore if the user has set to PWM register a certaivalue it will be
automatically overridden when the program execution engine controls the driver. LED cnrol nd program execu-
tion engine operation is described in the chapter Control Reister etails.
ꢀ
Master Fader Control
In addition to LED-by-LED PWM register control, the 661 is equipped with so called master fader control,
which allows the user to fade in or fade out multiple LEy writing to only oregister. This is an useful function
to minimize serial bus traffic between the MCU and the S3661. The AS361 hahree master fader registers, so
it is possible to form three master fader groups. Master fader control cabe ued with the engines as well.
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AS3661
Datasheet - Detailed Description
8.8 I2C Compatible Control Interface
The AS3661 supports the I2C bus protocol. A device that sends data onto the bus is defined as a transmitter and a
device receiving data as a receiver. The device that controls the message is called a master. The devices that are
controlled by the master are referred to as slaves. A master device that generates the serial clock (SCL), controls the
bus access, and generates the START and STOP conditions must control the bus. The AS3661 operates as a slave on
the I2C bus. Within the bus specifications a standard mode (100kHz maximum clock rate) and a fast mode (400kHz
maximum clock rate) are defined. The AS3661 works in both modes. Connections to the bus are made through the
open-drain I/O lines SDA and SCLTable 5
8.8.1 I2C Address selection
The slave address can be selected depending on the connection of the two address selection pins ASEL0 and ASEL
The selected address for reading and writing depending on the state of ASEL0 and ASEL1 can be found inTable 5
below.
Table 5. Chip Address Configuration
Address
(Hex)
32
8 biHex Address
ASEL1
ASEL0
/W
64/65
66/67
68/69
6A/6B
GND
GND
VEN
GND
VEN
33
GND
VEN
34
VEN
35
The following bus protocol has been defined (Figue 25):
ꢀ
ꢀ
Data transfer may be initiated only when the bus is not busy.
During data transfer, the data line must rmaistable whenevthe lock line is HIGH. Changes in the data line
while the clock line is HIGH are interpeted as control signals.
Accordingly, the following bus conditios hae been defined:
8.8.2 Bus Not Busy
Both data and clock lines remain HIGH.
8.8.3 Start Data Transfer
A change in the state of the data line, from HGH to LOW, while the clock is HIGH, defines a START condition.
8.8.4 Stop Data Transfer
A change in the state of the data lie, from LOW to HIGH, while the clock line is HIGH, defines the STOP condition.
8.8.5 Data Valid
The state of the data line reprsents valid data when, after a START condition, the data line is stable for the duration of
the HIGH period of the clck signal. The data on the line must be changed during the LOW period of the clock signal.
There is one clok pulsper bit of data.
Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of data bytes
transferred beween START and STOP conditions are not limited, and are determined by the master device. The
information is anserred byte-wise and each receiver acknowledges with a ninth bit.
8.6 Aknowledge
Eacreceiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The
master device must generate an extra clock pulse that is associated with this acknowledge bit.
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AS3661
Datasheet - Detailed Description
A device that acknowledges must pull down the SDA line during the acknowledge clock pulse in such a way that the
SDA line is stable LOW during the HIGH period of the acknowledge-related clock pulse. Of course, setup and hold
times must be taken into account. A master must signal an end of data to the slave by not generating an acknowledge
bit on the last byte that has been clocked out of the slave. In this case, the slave must leave the data line HIGH to
enable the master to generate the STOP condition.
Figure 25. Data Transfer on I2C Serial Bus
SDA
MSB
SLAVE
ADDRESS
R/W
DIRECTION
BIT
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVER
ACKNOWLEDGEMENT
SIGNAL FROM
RECEIVE
SCL
1
9
1
2
6
7
8
2
3-8
8
9
ACK
STOP CONDITION
OR REPEATED
START CONDITION
START
CONDITION
REPEAD IF
MORE BYTEARE
TRNSERRED
Depending upon the state of the R/W bit, twtypeof data transfere possible:
1. Data transfer from a master trasmiter to a slave reciver. The first byte transmitted by the master is the
slave address. Next follows a nmbr of data bytes. Te slae returns an acknowledge bit after each received
byte. Data is transferred with tmost significant bit (MB) first.
2. Data transfer from a slave transmitter to a meceiver. The master transmits the first byte (the slave
address). The slave then returns an acknowledge bit, followed by the slave transmitting a number of data
bytes. The master returns an acknowledgbit aer all received bytes other than the last byte. At the end of the
last received byte, a “not acknowledge” is returned. The master device generates all of the serial clock pulses
and the START and STOP condition. A transfer is ended with a STOP condition or with a repeated START
condition. Since a repeated STARcondition is also the beginning of the next serial transfer, the bus is not
released. Data is transferred with most significant bit (MSB) first.
The AS3661 can operate in the foowing two modes:
1. Slave Receiver Mode (Wrte Mode): Serial data and clock are received through SDA and SCL. After each
byte is received an acknwledge bit is transmitted. START and STOP conditions are recognized as the begin-
ning and end of a seril transfer. Address recognition is performed by hardware after reception of the slave
address and direcon bit (see Figure 26). The slave address byte is the first byte received after the master
generatete START condition. The slave address byte contains the 7-bit AS3661 address, which is
01100102, foowed by the direction bit (R/W), which, for a write, is 0.3 After receiving and decoding the slave
address bye the device outputs an acknowledge on the SDA line. After the AS3661 acknowledges the slave
addres+ write bit, the master transmits a register address to the AS3661. This sets the register pointer on the
3661. The master may then transmit zero or more bytes of data (if more than one data byte is written see
ao Blockwrite/read boundaries on page 24), with the AS3661 acknowledging each byte received. The
2. ’XXX’ depends on the external connection of ASEL0 and ASEL1; see Chip Address Configuration on page
22
3. The address for writing to the AS3661 is 8Xh = 01100100b - see Table 5
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AS3661
Datasheet - Detailed Description
address pointer will increment after each data byte is transferred. The master generates a STOP condition to
terminate the data write.
2. Slave Transmitter Mode (Read Mode): The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmit-
ted on SDA by the AS3661 while the serial clock is input on SCL. START and STOP conditions are recognized
as the beginning and end of a serial transfer (Figure 26 and Figure 27). The slave address byte is the first byte
received after the master generates a START condition. The slave address byte contains the 7-bit AS3661
address, which is 0110010, followed by the direction bit (R/W), which, for a read, is 1.4 After receiving and
decoding the slave address byte the device outputs an acknowledge on the SDA line. The AS3661 then
begins to transmit data starting with the register address pointed to by the register pointer (if more than one
data byte is read see also Blockwrite/read boundaries on page 24). If the register pointer is not written to
before the initiation of a read mode the first address that is read is the last one stored in the register pointr.
The AS3661 must receive a “not acknowledge” to end a read.
Figure 26. Data Write - Slave Receiver Mode
<Data(n+X
XXXXXXX
<Slave Address>
0110010
<Word Address (n)>
XXXXXXXX
<Data(n)>
<Data(1)>
XXXXXX
S
0
A
A
XXXXXX
A
A
A
P
S - Start
A - Acknowledge (ACK)
P - Stop
Data Transferre
(X + 1 Bytes + Acknoedge)
Figure 27. Data Read (Write Pointer, en Read) - Slaveive and Transmit
Word Address (n)>
XXXXXXX
<Slave Address>
1
A
S
0110010
0
A
Sr
0110010
<ata(n+1)>
XXXXXXXX
<Data(n+2)>
XXXXXXXX
<Data(n+X)>
XXXXXXXX
<Data(n)>
XXXXXXXX
A
A
A
NA
P
S - tart
S- Reated Start
Acknwledge (ACK)
P - top
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
NA -Not Acknowledge (NACK)
4. The address for read mode from the AS3661 is 8Xh+1 = 01100101b - see Table 5
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AS3661
Datasheet - Detailed Description
8.8.7 Program Downloading
First the register page_select is set to the program page, which should be accessed. Then the program page (part of or
full page) can be downloaded to the registers Cmd_0_MSB, Cmd_0_LSB, Cmd_1_MSB, Cmd_1_LSB...Cmd_F_MSB,
Cmd_F_LSB (I2C registers area 50h to 6Fh).
Table 6. Page_Select Register
Addr: 4Fh
Bit Name
Page_Select Register
Description
Bit
Default Access
Selects program page for download
page 0 - Addr 00h-0Fh
page 1 - Addr 10h-1Fh
page 2 - Addr 20h-2Fh
page 3 - Addr 30h-3Fh
page 4 - Addr 40h-4Fh
page 5 - Addr 50h5Fh
don’t use
000
001
010
011
100
101
110
111
page_select
2:0
000b
R/W
don’t us
8.9 Register Set
The AS3661 is controlled by a set of registers through the twwire serial intefacport. Some register bits are
reserved for future use. Table below lists device registers, their addresses antheir abbreviations. A more detailed
description is given in chapter Control Register Details.
Table 7. Description of Registers
Default Vue
After eset
Hex
Address
Register Name
Bit(s)
Type
Description
CHIP_EN
[6]
xxxxxx
0
1
AS3661 not enabled
AS3661 enabled
ENGINE1_EXEC
Engine 1 program execution control
ENABLE / ENGINE
CNTRL1
[5:4]
[3:2]
[1:0]
[5:4]
[3:2]
[1:0]
xx00xxxx
xxxx00xx
xxxxxx00
xx00xxxx
xxxx00xx
xxxxxx00
00
/W
ENGINE2_EXEC
Engine 2 program execution control
ENGINE3_EXEC
Engine 3 program execution control
ENGINE1_MODE
ENGINE 1 mode control
ENGINE2_MODE
ENGINE 2 mode control
01
2
ENGINCNTRL2
R/W
R/W
ENGINE3_MODE
ENGINE 3 mode control
OUTPUT DIRECT/
RATIOMETRIC
MSB
LED9_RATIO_EN
Enables ratiometric dimming for LED9 output
[0]
xxxxxxx0
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Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
[0]
[7]
[6]
[5]
[4
[3]
[2]
[1]
Type
Description
LED8_RATIO_EN
Enables ratiometric dimming for LED8 output
0xxxxxxx
x0xxxxxx
xx0xxxxx
xxx0xxxx
xxxx0xxx
xxxxx0xx
xxxxxx0x
xxxxxx0
xxx1
1xxxxxxx
x1xxxxx
xx1xxxxx
xxxx
xxxx1xxx
xxxxx1xx
xxxxxx1x
LED7_RATIO_EN
Enables ratiometric dimming for LED7 output
LED6_RATIO_EN
Enables ratiometric dimming for LED6 outpu
LED5_RATIO_EN
Enables ratiometric dimming for LED5 oupu
OUTPUT DIRECT/
03
R/W
RATIOMETRIC LSB
LED4_RATIO_EN
Enables ratiometric dimming for LED4 otput
LED3_RATIO_N
Enables ratiometric dimmig for LED3 output
LED2_RATO_E
Enables ratiometric mminfor LED2 output
LED1_RATIO_EN
Enables ratiomeric dmming for LED1 output
OUTPUT ON/OFF
04
R/W
LED9_ON
ON/OFF Control for LED9 output
CONTROL MSB
LED8_ON
ON/OFF Control for LED8 output
LED7_ON
ON/OFF Control for LED7 output
LED6_ON
ON/OFF Control for LED6 output
LED5_ON
ON/OFF Control for LED5 output
OUTPUT ON / OFF
CONTROL LSB
05
R/W
LED4_ON
ON/OFF Control for LED4 output
LED3_ON
ON/OFF Control for LED3 output
LED2_ON
ON/OFF Control for LED2 output
LED1_ON
ON/OFF Control for LED1 output
[0]
[7:6]
[5]
xxxxxxx1
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED1 output
LOG_EN
Logarithmic dimming control for LED1
06
07
LED1 CONTROL
LED2 CONTROL
R/W
R/W
TEMP COMP
Temperature compensation control for LED1
output
[4:0]
xxx00000
[7:6]
[5]
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED2 output
LOG_EN
Logarithmic dimming control for LED2 output
TEMP COMP
Temperature compensation control for LED2
output
[4:0]
xxx00000
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[7:6]
[5]
Type
Description
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED3 output
LOG_EN
R/W
Logarithmic dimming control for LED3 output
08
09
0A
0B
0C
0D
0E
LED3 CONTROL
LED4 CONTROL
LED5 CONTROL
LED6 CONTROL
LED7 CONTROL
LED8 CONTROL
LD9 CONTROL
TEMP COMP
Temperature compensation control for LED3
output
[4:0]
xxx00000
[7:6]
[5]
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED4 output
LOG_EN
R/W
R/W
R/W
R/W
R/W
R/W
Logarithmic dimming control for LED4 utp
TEMP COMP
Temperature compensation ontrol for LED4
output
[4:0]
xxx00000
[7:6]
[5]
00xxxxxx
xx0xxxx
MAPPING Mapping or LD5 output
LOG_EN
ogarithmic dimming cotrol for LED5 output
TEMP COMP
Temperture compensation control for LED5
output
[4:0]
x00
[7:6]
[5]
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED6 output
LOG_EN
garithmic dimming control for LED6 output
TEMP COMP
Temperature compensation control for LED6
output
[4:0]
xxx0000
[7
[5]
xxxxx
0xxxxx
MAPPING Mapping for LED7 output
LOG_EN
Logarithmic dimming control for LED7 output
TEMP COMP
Temperature compensation control for LED7
output
[4:0]
xxx00000
[7:6]
[5]
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED8 output
LOG_EN
Logarithmic dimming control for LED8 output
TEMP COMP
Temperature compensation control for LED8
output
[4:0]
xxx00000
[7:6]
[5]
00xxxxxx
xx0xxxxx
MAPPING Mapping for LED9 output
LOG_EN
Logarithmic dimming control for LED9 output
TEMP COMP
Temperature compensation control for LED9
output
[4:0]
xxx00000
0F to 15
16
[7:0]
[7:0]
[7:0]
[7:0]
reserved
LED1 PWM
LED2 PWM
LED3 PWM
R/W
R/W
R/W
00000000
00000000
00000000
PWM duty cycle control for LED1
PWM duty cycle control for LED2
PWM duty cycle control for LED3
17
18
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Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
Type
Description
19
1A
LED4 PWM
LED5 PWM
LED6 PWM
LED7 PWM
LED8 PWM
LED9 PWM
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
00000000
00000000
00000000
00000000
00000000
00000000
PWM duty cycle control for LED4
PWM duty cycle control for LED5
PWM duty cycle control for LED6
PWM duty cycle control for LED7
PWM duty cycle control for LED8
PWM duty cycle control for LED9
reserved
1B
1C
1D
1E
1F to 25
CURRENT
LED1 output current control register.
Default 17.5 mA (tp.)
LED1 CURRENT
CONTROL
26
27
[7:0]
[7:0]
[7:0]
[7:0]
[7:0]
7:
[7:0]
[7:0]
R/W
R/W
R/W
R/W
R/
R/W
R/W
RW
R/W
10101111
10101111
10101111
10101111
1010111
1010111
10101111
10101111
10101111
CURRENT
LED2 output current ontrl register.
Default 15 mA (typ.)
LED2 CURRENT
CONTROL
CURRENT
LED3 output currnt control register.
Default 17.5 mA (typ.)
LED3 CURRENT
CONTROL
28
CURRENT
LEDoutput current control register.
Default 17.5 mA (typ.)
LED4 CURRENT
CONTROL
29
CURRENT
LED5 output current control register.
Default 17.5 mA (typ.)
LED5 CURRENT
CONTROL
2A
CURRENT
LED6 output current control register.
Default 17.5 mA (typ.)
LED6 CURRENT
CONTROL
2B
CURRENT
LED7 output current control register.
Default 17.5 mA (typ.)
LED7 CURRENT
CONTROL
2C
0x2D
CURRENT
LED8 output current control register.
Default 17.5 mA (typ.)
LED8 CURRENT
CONTROL
CURRENT
LED9 output current control register.
Default 17.5 mA (typ.)
LED9 CURRENT
CONTROL
0x2E
[7:0
[7:0]
2F to 35
reserved
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[7]
Type
Description
VARIABLE_D_SEL
Variable LED source selection
0xxxxxxx
x1xxxxxx
xx0xxxxx
xxx00xxx
xxxxx0xx
xxxxxx0x
xxxxxxx0
EN_AUTO_INCR
Serial bus address auto increment enable
[6]
POWERSAVE_EN
Powersave mode enable
[5]
CP_MODE
Charge pump gain selection
36
MISC
[4:3]
[2]
R/W
PWM_PS_EN
PWM cycle powersave enable
CLK_DET_E
External clock dtectn
[1]
INT_CLKEN
Clock soe seection
[0]
37
38
39
ENGINE1 PC
ENGINE2 PC
ENGINE3 PC
[6:0]
[6:0]
[6:0]
R/W
R/W
R/W
x000000
000000
x0000
PC Program counter for engine 1
PC Program counter for engine 2
PC rogram counter for engine 3
LEDTEST_MEAS_DONE
Indictes when the LED test measurement is
done.
[7]
[6]
[
[4]
0xxxxxxx
x1xxxxxx
xxxxx
xxx0xxxx
MASK_BUSY
Mask bit for interrupts generated by
STARTUP_BUSY or ENGINE_BUSY
STARTUP_BUSY
This bit indicates that the start-up sequence
is running
ENGINE_BUSY
STATUS /
INTERRUPT
3A
R
This bit indicates that a program execution
engine is clearing internal registers
EXT_CLK_USED
Indicates when external clock signal is in use
[3]
[2]
[1]
[0]
xxxx0xxx
xxxxx0xx
xxxxxx0x
xxxxxxx0
ENG1_INT
Interrupt bit for program execution engine 1
ENG2_INT
Interrupt bit for program execution engine 2
ENG3_INT
Interrupt bit for program execution engine 3
INT_CONF
INT pin can be configured to function as a
GPO with this bit
[2]
[1]
[0]
xxxxx0xx
xxxxxx0x
xxxxxxx0
3B
3C
GPO
R/W
R/W
GPO pin control
INT_GPO
GPO pin control for INT pin (when
INT_CONF is set "1")
VARIABLE
Global 8-bit variable
VARIABLE
[7:0]
00000000
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
Type
Description
RESET
Writing 11111111 into this register resets the
AS3661
3D
RESET
[7:0]
R/W
00000011
TEMP_MEAS_BUSY
Indicates when temperature measurement is
active
[7]
[2]
[1]
R
0xxxxxxx
xxxxx0xx
xxxxxx0x
EN_TEMP_SENSOR
Reads the internal temperature sensor onc
TEMP ADC
CONTROL
3E
CONTINUOUS_CONV
Continuous temperature measuremnt
selection
R/W
SEL_EXT_TEMP
Internal/external tempratursensor
selection
[0]
xxxxxxx0
TEMPRATURE
Bits for temperatre information
TEMPERATURE
READ
3F
40
[7:0]
[7:0]
R
0001101
000000
TMPERATURE
Bits for temperature information
TEMPERATURE
WRITE
R/W
[7]
[6]
0xxxxx
x0xxxxxx
EN_LED_TEST_ADC
EN_LED_TEST_INT
LED TEST
CONTROL
CONTINUOUS_CONV
onnuous LED test measurement selection
41
42
R/W
R
[5]
xx0xxxxx
xxx00000
N/A
LED_TEST_CTRL
Control bits for LED test
[4:0]
[7:
LED_TEST_ADC
LED test result
LED TEST ADC
43
44
[7:0]
[7:0]
reserved
reserved
ENGINE1
45
46
47
[7:0]
[7:0]
7:0]
R
R
R
00000000
00000000
00000000
VARIABLE FOR ENGINE1
VARIABLE FOR ENGINE2
VARIABLE FOR ENGINE3
VARIABLE A
ENGINE2
VARIABLE A
ENGINE3
VARIABLE A
48
49
4A
4B
MASTER FADER
MASTER FADR2
MASTR FADER3
[7:0]
[7:0]
[7:0]
[7:0]
R/W
R/W
R/W
00000000
00000000
00000000
MASTER FADER 1
MASTER FADER 2
MASTER FADER 3
reserved
ENG1 PROG
START ADDR
4C
D
4E
4F
[6:0]
[6:0]
[6:0]
[2:0]
R/W
R/W
R/W
R/W
x0000000
x0001000
x0010000
xxxxx000
Engine 1 program start address
Engine 2 program start address
Engine 3 program start address
PAGE_SEL
ENG2 PROG
START ADDR
ENG3 PROG
START ADDR
PROG MEM PAGE
SEL
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[15:8]
[7:0]
Type
Description
50
51
52
53
54
55
56
57
PROGRAM
MEMORY
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
R/W
00H/10H/20H/30H/
40H/50H
CMD
Every Instruction is 16–bit width. The
AS3661 can store 96 instructions. Each
instruction consists of 16 bits. Because one
register has only 8 bits, one instruction
requires two register addresses. In order to
reduce program load time the AS3661
supports address auto-incrementation.
Register address is incremented after each
data bits. Thus the whole program meory
page can be written in one serial bus write
sequence.
PROGRAM
MEMORY
[15:8]
[7:0]
R/W
R/W
R/W
01H/11H/21H/31H/
41H/51H
PROGRAM
MEMORY
[15:8]
[7:0]
02H/12H/22H/32H/
42H/52H
PROGRAM
MEMORY
[15:8]
[7:0]
03H/13H/23H/33H/
43H/53H
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[15:8]
[7:0]
Type
Description
58
59
5A
5B
5C
5D
5E
5F
60
61
62
63
64
65
66
67
68
69
6A
6B
6C
6D
6E
6F
PROGRAM
MEMORY
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
0000000
000000
000000
00000000
0000000
000000
0000
0000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
00000000
R/W
04H/14H/24H/34H/
44H/54H
PROGRAM
MEMORY
[15:8]
[7:0]
R/W
R/W
R/W
R/W
R/W
/W
R/W
R/W
R/W
R/W
R/W
05H/15H/25H/35H/
45H/55H
PROGRAM
MEMORY
[15:8]
[7:0]
06H/16H/26H/36H/
46H/56H
PROGRAM
MEMORY
[15:8]
[7:0]
07H/17H/27H/37H/
47H/57H
PROGRAM
MEMORY
[15:8]
[7:0]
08H/18H/28H/38H/
48H/58H
CMD
Every struction is 16–bit width. The
AS361 cstore 96 instructions. Each
instuctioconsists of 16 bits. Because one
reister has only 8 bits, one instruction
quires two register addresses. In order to
rduce program load time the AS3661
supports address auto-incrementation.
Register address is incremented after each 8
data bits. Thus the whole program memory
page can be written in one serial bus write
sequence.
PROGRAM
MEMORY
[15:8]
[7:0]
09H/19H/29H/39H/
49H/59H
PROGRAM
MEMORY
[15:8]
[7:0]
0AH/1AH/2AH/3AH/
4AH/5AH
PROGRAM
MEMORY
[15
[7:0]
0BH/1BH/2BH/3BH/
4BH/5BH
PROGRAM
MEMORY
0CH/1CH/2CH/
3CH/4CH/5CH
[15:8]
[7:0]
PROGRAM
MEMORY
[15:8]
[7:0]
0DH/1DH/2DH/36D/
46D/5DH
PROGRM
MEMORY
[15:8]
[7:0]
0EH/EH/2EH/3EH/
4E/5EH
PROGRAM
MEMORY
[15:8]
[7:0]
0FH/1FH/2FH/3FH/
4FH/5FH
GPO
[7]
[0]
0xxxxxxx
xxxxxxx0
Engine 1 mapping information, GPO pin
ENG1 MAPPING
MSB
70
R
D9
Engine 1 mapping information, D9 output
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
[7]
[0]
[7]
[6]
[5
[4]
[3]
[2]
[1]
[0]
[7]
[0]
Type
Description
LED8
0xxxxxxx
x0xxxxxx
xx0xxxxx
xxx0xxxx
xxxx0xxx
xxxxx0xx
xxxxxx0x
xxxxxx0
0xxx
xxxxxxx0
0xxxxxx
x0xxxxxx
xxxx
xxx0xxxx
xxxx0xxx
xxxxx0xx
xxxxxx0x
xxxxxxx0
0xxxxxxx
xxxxxxx0
Engine 1 mapping information, LED8 output
LED7
Engine 1 mapping information, LED7 output
LED6
Engine 1 mapping information, LED6 output
LED5
Engine 1 mapping information, LED5 oupu
ENG1 MAPPING
71
R
LSB
LED4
Engine 1 mapping information, LED4 otput
LED3
Engine 1 mapping informion, ED3 output
LED
Engine 1 mapping irmaon, LED2 output
LED1
Engine 1 mappinrmation, LED1 output
GPO
Engine 2 mapping information, GPO pin
ENG2 MAPPING
72
R
R
R
MSB
LED9
Engne 2 mapping information, D9 output
LED8
Engine 2 mapping information, LED8 output
LED7
Engine 2 mapping information, LED7 output
LED6
Engine 2 mapping information, LED6 output
LED5
Engine 2 mapping information, LED5 output
ENG2 MAPPING
73
LSB
LED4
Engine 2 mapping information, LED4 output
LED3
Engine 2 mapping information, LED3 output
LED2
Engine 2 mapping information, LED2 output
LED1
Engine 2 mapping information, LED1 output
GPO
Engine 3 mapping information, GPO pin
NG3 MAPPING
74
MSB
LED9
Engine 3 mapping information, LED9 output
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AS3661
Datasheet - Detailed Description
Table 7. Description of Registers
Default Value
After Reset
Hex
Register Name
Address
Bit(s)
[7]
Type
Description
LED8
0xxxxxxx
x0xxxxxx
xx0xxxxx
xxx0xxxx
xxxx0xxx
xxxxx0xx
xxxxxx0
xxxxxxx
Engine 3 mapping information, LED8 output
LED7
[6]
Engine 3 mapping information, LED7 output
LED6
[5]
Engine 3 mapping information, LED6 output
LED5
[4]
Engine 3 mapping information, LED5 outpu
ENG3 MAPPING
75
R
LSB
LED4
[3]
Engine 3 mapping information, LED4 oput
LED3
[2]
Engine 3 mapping informaon,LD3 output
ED2
[1]
Engine 3 mapping infrmation, LED2 output
LED1
[0]
Engine 3 mapping inormation, LED1 output
TRESHOLD
Treshold voltage (typ.)
00
1
10
11
400mV
300mV
200mV
100mV
[7:6]
R/W
00xxxxxx
ADAPTIVE_TRESH_EN
Activates adaptive threshold.
[5
[4:3]
[2
R/W
R/W
R/W
x0xxxx
xxx00xxx
xxxxx0xx
GAIN CHANGE
76
CTRL
TIMER
5ms
00
01
10
11
10ms
50ms
Infinite
FORCE_1x
Activates 1.5x to 1x timer
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AS3661
Datasheet - Detailed Description
8.10 Control Register Details
8.10.1 ENABLE/ ENGINE CONTROL1
This register controls the startup of the chip and the program execution modes for each program execution engine.
Table 8. ENABLE / ENGINE CNTR 1 Register
Register: 0x00
Bit Name
ENABLE / ENGINE CNTR1
Bit Description
Bit
Default
Access
6
CHIP_EN
0: Standby mode is entered. Still, control registers can be
written or read, excluding bits [5:0] in reg 00 (this
register), registers 16h to 1E (LED PWM registers) and 37
to 39h (program counters).
0
R/W
1: internal startup sequence powers up all the needed inern
blocks and the device enters normal mode.
5:4
ENGINE1_EXEC
The engine 1 program execution control regiser bits define
how the program is executed. Program staraddess can be
programmed to program counter (PC) register 0x37.
00: Hold cuses the execution engito fiish the current
instructin and hen stop. Program conter (PC) can be
read or witten nly in this moe.
01cute the instruction at the location pointed by the PC,
incrnt the PC by one d then reset ENG1_EXEC bits to
00 (i.enter hold).
00
R/W
10: Start program exeution from the location pointed by the
C. This mode is so clled “Free Run” mode.
11: Executthe strction pointed by the current PC value
and reset EN1_EXEC to 00 (i.e. enter hold). The difference
between sp and execute once is that execute once does not
incremnt the PC.
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AS3661
Datasheet - Detailed Description
Table 8. ENABLE / ENGINE CNTR 1 Register
Register: 0x00
ENABLE / ENGINE CNTR1
Bit Description
Bit
Bit Name
Default
Access
3:2
ENGINE2_EXEC
The engine 2 program execution control register bits define
how the program is executed. Program start address can be
programmed to program counter (PC) register 0x38.
00: Hold causes the execution engine to finish the current
instruction and then stop. Program counter (PC) can be
read or written only in this mode.
01: Execute the instruction at the location pointed by the PC,
increment the PC by one and then reset ENG2_EXEC bits to
00 (i.e. enter hold).
00
R/W
10: Start program execution from the location pointed by he
PC. This mode is also called “Free Run” mod.
11: Execute the instruction pointed by the crrent PC value
and reset ENG2_EXEC to 00 (i.e. enter hold). he difference
between step and execute once is tht exeute once does not
incrementhe P.
1:0
ENGINE3_EXEC
The engi3 proram execution ontrol register bits define
hothe program is executed. Program start address can be
prod to program nter (PC) register 0x39.
00: Hld causes the executin engine to finish the current
instruction and then stopProgram counter (PC) can be
ead or written only ithis mode.
01: Executes thnstruction at the location pointed by the PC,
increment tPC by one and then reset ENG3_EXEC bits to
00 (i.e. enter hl).
00
R/W
10: Stat program execution from the location pointed by the
PChis mode is also called “Free Run” mode.
1cute the instruction pointed by the current PC value
and reset ENG3_EXEC to 00 (i.e. enter hold). The difference
etween step and execute once is that execute once does not
increment the PC.
8.10.2 ENGINE CNTRL2
The AS3661 supports up to four different eration modes which are defined in these registers.
Disabled: Engines can be configed tdisabled mode each one separately.
Load program: Writing to progam memory is allowed only when the engine is in load program operation mode and
engine busy bit (reg 3A) is nset. Serial bus master should check the busy bit before writing to program memory. All
the three engines are in ld while one or more engines are in load program mode. PWM values are frozen, also.
Program execution cotinues when all the engines are out of load program mode. Load program mode resets the
program counter ohe respective engine. Load program mode can be entered from the disabled mode only. Entering
load program mode fm the run program mode is not allowed.
Run ProgramRuprogram mode executes the instructions stored in the program memory. Execution register
(ENG1_C etc.) bits define how the program is executed (hold, step, free run or execute once). Program start
address n e programmed to the Program Counter (PC) register. The Program Counter is reset to zero when the
PCs upper limit value is reached.
Halt: Istruction execution aborts immediately and engine operation halts.
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Table 9. ENGINE CNTRL2 Register
Register: 0x01
ENGINE CNTRL2
Bit Description
Bit
Bit Name
Default
Access
5:4
ENGINE1_MODE
00: Disabled
01: Load program to SRAM, reset engine 1 PC
10: Run program as defined by ENGINE1_EXEC bits
11: Halts the engine
00
R/W
3:2
1:0
ENGINE2_MODE
ENGINE3_MODE
00: Disabled
01: Load program to SRAM, reset engine 2 PC
10: Run program as defined by ENGINE2_EXEC bits
11: Halts the engine
00
00
R/W
R/W
00: Disabled
01: Load program to SRAM, reset engine PC
10: Run ograas defined by ENGINE_EXEC bits
11: Halts te engne
8.10.3 OUTPUT DIRECT/RATIOMETRIC MSB and B
A particular feature of the AS3661 is the ratiometric up/down dimming of the RG-LEDs. In other words, the LED
driver PWM output will vary in a ratiometric manner. By a ratiometric approathe emitted color of an RGB–LED
remains the same regardless of the initial magnitus othe R/G/B PWutpus. For example, if the PWM output of
the red LED output is doubled, the output of gren LED is doubled also
Table 10. OUTPUT DIRECT / RATIOMERIC MSB Register
Register: 0x02
Bit Name
OUTPUDIRECT/RATIOMETRIC MSB
Bit Description
Bit
Defa
Access
0
LED9_RATIO_EN
0: sables ratiometric dimming for LED9 output.
enables ratiometric dimming for LED9 output.
0
R/W
Table 11. OUTPUT DIRECT / RATIOMETRIC LSB Register
Register: 0x03
Bit Name
OUTPUT DIRECT/RATIOMETRIC LSB
Bit
Default
Access
Bit Description
7
LED8_RATIO_EN
0: Disables ratiometric dimming for LED8 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED7 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED6 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED5 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED4 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED3 output.
1: enables ratiometric dimming for LED9 output.
0
R/W
6
5
4
3
2
LED7_RATIO_EN
LED6_RATO_EN
ED5_RATIO_EN
LED4_RATIO_EN
LED3_RATIO_EN
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
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Table 11. OUTPUT DIRECT / RATIOMETRIC LSB Register
Register: 0x03
Bit Name
OUTPUT DIRECT/RATIOMETRIC LSB
Bit
Default
Access
Bit Description
1
LED2_RATIO_EN
0: Disables ratiometric dimming for LED2 output.
1: enables ratiometric dimming for LED9 output.
0: Disables ratiometric dimming for LED1 output.
1: enables ratiometric dimming for LED9 output.
0
R/W
0
LED1_RATIO_EN
0
R/W
8.10.4 OUTPUT ON/OFF CONTROL MSB and LSB
The following two registers allow the user to switch all nine current sources independently from each other on and off
Please mind that this selection will be overridden if a current source is selected by one of the program execution
engines.
Table 12. OUTPUT ON/OFF CONTROL MSB Register
Register: 0x04
Bit Name
OUTPUT ON/OFF CONTROL MSB
Bit Descriptin
Bit
Default
Access
0
LED9_ON
0: LED9 utput ff.
0
R/W
1: LED9 oput n.
Table 13. OUTPUT ON/OFF CONTROL LSB Register
Register: 0x05
OUTPUT ON/OFF CONROL LSB
it Description
Bit
Bit Name
Default
Accss
7
LED8_ON
0: LED8 outpuff.
1: LED8 outpon.
0: LED7 ouput off.
1: D7 utput on.
06 output off.
1: LED6 output on.
0: LED5 output off.
1: LED5 output on.
0: LED4 output off.
1: LED4 output on.
0: LED3 output off.
1: LED3 output on.
0: LED2 output off.
1: LED2 output on.
0: LED1 output off.
1: LED1 output on.
0
R/W
6
5
4
3
2
1
0
LED7_ON
LED6_ON
LED5_ON
LED4_ON
LED3_ON
LED2_ON
LED1_N
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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8.10.5 LEDx Control
These registers are used to assign the any current source output to the MASTER FADER group 1, 2, or 3, or none of
them. Also, the registers set the slope of the current sources output temperature compensation line and selects
between linear and logarithmic PWM brightness adjustment. By using logarithmic PWM-scale the visual effect looks
like linear. When the logarithmic adjustment is enabled, the chip handles internally PWM values with 12-bit resolution.
This allows very fine-grained PWM control at low PWM duty cycles. If a MASTER FADER is selected for an output, the
duty cycle on the output will be LED1 PWM register value (address 0x16) multiplied with the value in the MASTER
FADER register.
Besides the LED mapping and linear or logarithmic selection it is also possible to do a temperature compensation for
each output separately. The PWM duty cycle at temperature T (in centigrade) can be obtained as follows: PWMF =
[PWMS - (25 - T) * slope * PWMS] / 2, where PWMF is the final duty cycle at temperature T, PWMS is the set PWM duty
cycle (PWM duty cycle is set in registers 16H to 1EH) and the value of the correction factor is obtained from Table 8.
For example, if the set PWM duty cycle in register 16H is 90%, temperature T is -10°C and the chosen s lope is +1.5
°C, the final duty cycle PWMF for LED1 output will be [90% - (25°C - (-10°C))* 1.5 1/°C * 90%]/2 = [90 % - 35 * 15 *
90%]/2 = 21.4%. Default setting 00000 means that the temperature compensation is non-active and the PWM output
(0 to 100%) is set solely by PWM registers LED1 PWM to LED9 PWM.
Table 14. LED1 CONTROL Register
Register: 0x06
Bit Name
LED1 CONTROL
Bit Descrption
Bit
Default
Access
7:6
LED1_MAPPING
Thegister defines the mapping of LED1 output to the master
fadhe faders can eitr be used for dimming several
LEDn parallel or for ratiomric control of the output.
00: no master fader eleced
00
R/W
1: MASTER FAR 1 controls LED1 output
10: MASTEFAER 2 controls LED1 output
11: MASTER FDER 3 controls LED1 output
5
LED1_LOG_EN
This biis effective for both, program execution engine and
dirPWM control.
0
R/W
0ar adjustment.
1: logarithmic adjustment.
4:0 LED1_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
11110: -1.4 1/°C
0 0000
R/W
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
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Table 15. LED2 CONTROL Register
Register: 0x07
LED2 CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:6
LED2_MAPPING
This register defines the mapping of LED2 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
00
R/W
01: MASTER FADER 1 controls LED2 output
10: MASTER FADER 2 controls LED2 output
11: MASTER FADER 3 controls LED2 output
5
LED2_LOG_EN
This bit is effective for both, program execution engine nd
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED2_TEMP_COMP
The reference temperature is +25°C (i.e. te temper ature at
which all sope settings have no effec) and te temperature
coefficie(slopecan be set in 0.1 1/°C sps to any value
between -5 1/°and +1.5 1/°C, ita default to 0.0 1/°C
111.5 1/°C
1111-1.4 1/°C
0 0000
R/W
...
0000: temperacompensation not activated
...
01110: +1.4 1/
011111.5 /°C
Table 16. LED3 CONTROL Register
Register: 0x08
LED3 CONTROL
Bit Description
Bit
Bit Name
Default
Acces
7:6
LED3_MAPPING
This register defines the mapping of LED3 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
00
R/W
01: MASTER FADER 1 controls LED3 output
10: MASTER FADER 2 controls LED3 output
11: MASTER FADER 3 controls LED3 output
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Table 16. LED3 CONTROL Register
Register: 0x08
LED3 CONTROL
Bit Description
Bit
Bit Name
Default
Access
5
LED3_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED3_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
11110: -1.4 1/°C
0 0000
R/W
...
00000: temperature compensation not ctivted
...
01110: +4 1/°C
011: +1.5 1/°C
Table 17. LED4 CONTROL Register
Register: 0x09
LED1 COTROL
Bit Description
Bit
Bit Name
Default
Access
7:6
LED4_MAPPING
This registefins the mapping of LED4 output to the master
faders. The faers can either be used for dimming several
LEDs in parllel or for ratiometric control of the output.
00: no mster fader selected
00
R/W
0STER FADER 1 controls LED4 output
10: MASTER FADER 2 controls LED4 output
11: MASTER FADER 3 controls LED4 output
5
LED4_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED4_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
11110: -1.4 1/°C
0 0000
R/W
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
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Table 18. LED5 CONTROL Register
Register: 0x0A
LED1 CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:6
LED5_MAPPING
This register defines the mapping of LED5 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
00
R/W
01: MASTER FADER 1 controls LED5 output
10: MASTER FADER 2 controls LED5 output
11: MASTER FADER 3 controls LED5 output
5
LED5_LOG_EN
This bit is effective for both, program execution engine nd
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED5_TEMP_COMP
The reference temperature is +25°C (i.e. te temper ature at
which all sope settings have no effec) and te temperature
coefficie(slopecan be set in 0.1 1/°C sps to any value
between -5 1/°and +1.5 1/°C, ita default to 0.0 1/°C
111.5 1/°C
1111-1.4 1/°C
0 0000
R/W
...
0000: temperacompensation not activated
...
01110: +1.4 1/
011111.5 /°C
Table 19. LED6 CONTROL Register
Register: 0x0B
LED6 CONTROL
Bit Description
Bit
Bit Name
Default
Acces
7:6
LED6_MAPPING
This register defines the mapping of LED6 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
00
R/W
01: MASTER FADER 1 controls LED6 output
10: MASTER FADER 2 controls LED6 output
11: MASTER FADER 3 controls LED6 output
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Table 19. LED6 CONTROL Register
Register: 0x0B
LED6 CONTROL
Bit Description
Bit
Bit Name
Default
Access
5
LED6_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED6_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
11110: -1.4 1/°C
0 0000
R/W
...
00000: temperature compensation not ctivted
...
01110: +4 1/°C
011: +1.5 1/°C
Table 20. LED7 CONTROL Register
Register: 0x0C
LED7 COTROL
Bit Description
Bit
Bit Name
Default
Access
7:6
LED7_MAPPING
This registefins the mapping of LED7 output to the master
faders. The faers can either be used for dimming several
LEDs in parllel or for ratiometric control of the output.
00: no mster fader selected
00
R/W
0STER FADER 1 controls LED7 output
10: MASTER FADER 2 controls LED7 output
11: MASTER FADER 3 controls LED7 output
5
LED7_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED7_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
11110: -1.4 1/°C
0 0000
R/W
...
00000: temperature compensation not activated
...
01110: +1.4 1/°C
01111: +1.5 1/°C
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Table 21. LED8 CONTROL Register
Register: 0x0D
LED8 CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:6
LED8_MAPPING
This register defines the mapping of LED8 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
00
R/W
01: MASTER FADER 1 controls LED8 output
10: MASTER FADER 2 controls LED8 output
11: MASTER FADER 3 controls LED8 output
5
LED8_LOG_EN
This bit is effective for both, program execution engine nd
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED8_TEMP_COMP
The reference temperature is +25°C (i.e. te temper ature at
which all sope settings have no effec) and te temperature
coefficie(slopecan be set in 0.1 1/°C sps to any value
between -5 1/°and +1.5 1/°C, ita default to 0.0 1/°C
111.5 1/°C
1111-1.4 1/°C
0 0000
R/W
...
0000: temperacompensation not activated
...
01110: +1.4 1/
011111.5 /°C
Table 22. LED9 CONTROL Register
Register: 0x0E
LED9 CONTROL
Bit Description
Bit
Bit Name
Default
Acces
7:6
LED9_MAPPING
This register defines the mapping of LED9 output to the master
faders. The faders can either be used for dimming several
LEDs in parallel or for ratiometric control of the output.
00: no master fader selected
00
R/W
01: MASTER FADER 1 controls LED9 output
10: MASTER FADER 2 controls LED9 output
11: MASTER FADER 3 controls LED9 output
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Table 22. LED9 CONTROL Register
Register: 0x0E
LED9 CONTROL
Bit Description
Bit
Bit Name
Default
Access
5
LED9_LOG_EN
This bit is effective for both, program execution engine and
direct PWM control.
0
R/W
0: linear adjustment.
1: logarithmic adjustment.
4:0 LED8_TEMP_COMP
The reference temperature is +25°C (i.e. the temper ature at
which all slope settings have no effect) and the temperature
coefficient (slope) can be set in 0.1 1/°C steps to any value
between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C
11111: -1.5 1/°C
11110: -1.4 1/°C
0 0000
R/W
...
00000: temperature compensation not ctivted
...
01110: +4 1/°C
011: +1.5 1/°C
8.10.6 LEDx PWM
This is the PWM duty cycle control for LED1 to ED9 output. The PWM gisters are effective during direct control
operation. Direct PWM control is active aftepowr up by default.
Note: Serial bus address auto increment s not supported for regster addresses from 16 to 1E.
Note: If the temperature compensatis active, the maum PWM duty cycle is 50% at +25°C. This is require d to
allow enough headroom for temperature compen over the temperature range -40 °C to 90°C.
Table 23. LED1 PWM Register
Register: 0x16
Bit Name
LED1 PWM
Bit Description
Bit
Default
Access
7:0
LED1_PWM
This register controls the duty cycle of LED1 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
R/W
1111 1111: 100% Duty Cycle
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Table 24. LED2 PWM Register
Register: 0x17
LED2 PWM
Bit Description
Bit
Bit Name
Default
Access
7:0
LED2_PWM
This register controls the duty cycle of LED2 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
R/W
1111 1111: 100% Duty Cycle
Table 25. LED3 PWM Register
Register: 0x18
LED3 PWM
Bit
Bit Name
Default
Access
Bit Description
7:0
LED3_PWM
This registr controls the duty cycle oED3 PWM output.
0000 000: 0% Dty Cycle
0000 0001: .3921% Duty Cycle
000100.7843% Duty ycle
0000 011: 1.1765% DuCyce
....
0000 0000
R/W
111 1111: 100% ty Cycle
Table 26. LED4 PWM Register
Register: 0x19
LED4 PWM
Bit
Bit Name
Defa
Access
Bit Description
7:0
LED4_PWM
Tgister controls the duty cycle of LED4 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
/W
1111 1111: 100% Duty Cycle
Table 27. LED5 PWM Rgiste
Register0x1A
LED5 PWM
Bit
Bit Nae
Default
Access
Bit Description
7:0
LED5PWM
This register controls the duty cycle of LED5 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
R/W
1111 1111: 100% Duty Cycle
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Table 28. LED6 PWM Register
Register: 0x1B
LED6 PWM
Bit Description
Bit
Bit Name
Default
Access
7:0
LED6_PWM
This register controls the duty cycle of LED6 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
R/W
1111 1111: 100% Duty Cycle
Table 29. LED7 PWM Register
Register: 0x1C
LED7 PWM
Bit
Bit Name
Default
Access
Bit Description
7:0
LED7_PWM
This registr controls the duty cycle oED7 PWM output.
0000 000: 0% Dty Cycle
0000 0001: .3921% Duty Cycle
000100.7843% Duty ycle
0000 011: 1.1765% DuCyce
....
0000 0000
R/W
111 1111: 100% ty Cycle
Table 30. LED8 PWM Register
Register: 0x1D
LED8 PWM
Bit
Bit Name
Defa
Access
Bit Description
7:0
LED8_PWM
Tgister controls the duty cycle of LED8 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
/W
1111 1111: 100% Duty Cycle
Table 31. LED9 PWM Rgiste
Register0x1E
LED9 PWM
Bit
Bit Nae
Default
Access
Bit Description
7:0
LED9PWM
This register controls the duty cycle of LED9 PWM output.
0000 0000: 0% Duty Cycle
0000 0001: 0.3921% Duty Cycle
0000 0010: 0.7843% Duty Cycle
0000 0011: 1.1765% Duty Cycle
....
0000 0000
R/W
1111 1111: 100% Duty Cycle
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8.10.7 LEDx CURRENT CONTROL
With the following register it is possible to control the output current of each current source separately. The resolution
of the current sources is 8-bit which gives a step size is 100 µA with a maximum output current of 25.5mA per current
source.
Table 32. LED1 CURRENT CONTROL Register
Register: 0x26
Bit Name
LED1 CURRENT CONTROL
Bit Description
Bit
Default
Access
7:0
LED1_CURRENT
This register controls the output current of current source
LED1 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111
R/W
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 11125.5m
Table 33. LED2 CURRENT CONTROL Register
Register: 0x27
D2 CURRENT CONROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED2_CURRENT
his register controls thoutput current of current source
LED2 in 100µA ps from 0µA up to 25.5mA.
0000 0000: mA
0000 00010.1mA
...
1010 1
R/W
111: 17.5mA
...
111 1110: 25.4mA
1111 1111: 25.5mA
Table 34. LED3 CURRENT CONTROL Rter
Register: 0x28
LED3 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED3_CURRENT
This register controls the output current of current source
LED3 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111
R/W
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
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Table 35. LED4 CURRENT CONTROL Register
Register: 0x29
LED4 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED4_CURRENT
This register controls the output current of current source
LED4 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111
R/W
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Table 36. LED5 CURRENT CONTROL Register
Register: 0x2A
LED5 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED5_CURRENT
This registr conrols the output urenof current source
LEn 100µA steps from 0µA up to 25.5mA.
000000: 0mA
0000 0001: 0.1mA
.
1010 1111
R/W
1010 1111: 17.5A
...
1111 1110: 2.4mA
11111125.5mA
Table 37. LED6 CURRENT CONTROL Register
Register: 0x2B
LED6 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED6_CURRENT
This register controls the output current of current source
LED6 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111
R/W
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
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Table 38. LED7 CURRENT CONTROL Register
Register: 0x2C
LED7 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED7_CURRENT
This register controls the output current of current source
LED7 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111
R/W
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
Table 39. LED8 CURRENT CONTROL Register
Register: 0x2D
LED8 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED8_CURRENT
This registr conrols the output urenof current source
LEn 100µA steps from 0µA up to 25.5mA.
000000: 0mA
0000 0001: 0.1mA
.
1010 1111
R/W
1010 1111: 17.5A
...
1111 1110: 2.4mA
11111125.5mA
Table 40. LED9 CURRENT CONTROL Register
Register: 0x2E
LED9 CURRENT CONTROL
Bit Description
Bit
Bit Name
Default
Access
7:0
LED9_CURRENT
This register controls the output current of current source
LED9 in 100µA steps from 0µA up to 25.5mA.
0000 0000: 0mA
0000 0001: 0.1mA
...
1010 1111
R/W
1010 1111: 17.5mA
...
1111 1110: 25.4mA
1111 1111: 25.5mA
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8.10.8 MISC
This register contains miscellaneous control bits like the clock detection. Program execution is clocked with internal
32.7 kHz clock or with external clock. External clock can be used if a clock signal is present on CLK-pin. The external
clock frequency must be 32.7 kHz in oder to meet the timing specifications of the datasheet and for correct operation.
If a higher or a lower frequency is used, it will affect on the program execution engine operation speed. The detector
block does not limit the maximum frequency. External clock status can be checked with read only bit EXT_CLK_USED
in register address 3A, when the external clock detection is enabled (Bit [1] CLK_DET_EN = high).
If external clock is not used in the application, CLK pin should be connected to GND to avoid oscillation on this pin and
extra current consumption.
Table 41. OUTPUT ON/OFF CONTROL LSB Register
Register: 0x05
Bit Name
OUTPUT ON/OFF CONTROL LSB
Bit Description
Bit
Default
Access
7
VARIABLE_D_SEL
The variable D can be linked to two different sources. Th
default source for variable D is register 0x3C bt it can be
assigned to the LED test ADC output. This aowsor example,
program execution control with an analog signl.
0
R/W
0: variablD source is register 0x3
1: variabD soue is LED test ADC.
6
EN_AUTO_INCR
Thautomatic increment feature of the serial bus address
enaquick memory rte of successive registers within
one nsmission.
1
0
R/W
R/W
0: serial bus address utoatic increment is disabled.
: serial bus addss automatic increment is enabled.
5
POWERSAVE_EN
CP_MODE
Please refr to stio8.14.9 for a detailed description of the
powersave mde of AS3661.
0: power sve mode is disabled.
1: power save mode is enabled.
4:3
gister bits control the operation mode of the integrated
charge pump. The charge pump can be switched off, forced to
ypass mode, forced to 1.5x mode and automatic operation.
00: CP is switched off.
00
R/W
01: CP is forced to bypass mode (1x).
10: CP is forced to 1.5x mode (output voltage is 4.5V)
11: CP is in automatic mode depending on load conditions
2
PWM_PS_EN
For a detailed description of this power save mode please refer
to section 8.14.10. This mode can only be used if the CP is in
off mode or 1x mode.
0
R/W
R/W
0: PWM power save mode disabled.
1: PWM power save mode enabled.
The following bits define the clock selection of AS3661.
00: forced external clock (CLK pin).
01: forced internal clock.
1
0
CK_DET_EN
NT_CLK_EN
00
10: automatic clock selection.
11: internal clock.
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8.10.9 ENGINEx PC
The program counter defines the starting value for each program execution engine. It can be any value between 000
0000 to 101 1111. The maximum value depends on program memory allocation between the three program execution
engines.
Table 42. ENGINE1 PC Register
Register: 0x37
Bit Name
ENGINE1 PC
Bit Description
Bit
Default
Access
6:0
ENGINE1_PC
Program counter value for execution engine1 from 000 0000 t
101 1111 depending on the memory allocation of the
application.
000 0000
R/W
Table 43. ENGINE2 PC Register
Register: 0x38
ENGINE2 PC
Bit
Bit Name
Default
Access
Bit Description
6:0
ENGINE2_PC
Program counter value for execution engie2 frm 000 0000 to
101 1111 dpending on the memory catin of the
application.
000 0000
R/W
Table 44. ENGINE3 PC Register
Register: 0x39
ENGINE3 PC
Bit
Bit Name
Default
Access
Bit Description
6:0
ENGINE3_PC
rogram counter value or execution engine 3 from 000 0000
o 101 1111 deping on the memory allocation of the
application
000 0000
R/W
8.10.10 STATUS/INTERRUPT
This register contains several status interrupt regist
Table 45. STATUS / INTERRUPT Register
Register: 0x3A
STATUS / INTERRUPT
Bit Description
Bit
Bit Name
Default
Access
7
LEDTEST_MEAS_D
ONE
This bit indicates when the LED test is done, and the result is
written to the LED_TEST_ADC register (0x42). Typically the
conversion takes 2.7 milliseconds to complete. The bit will not
be cleared after conversion. Each write command to this
register starts another conversion.
0
R/W
0: LED test not done.
1: LED test done.
6
MASKBUSY
Mask bit for interrupts generated by STARTUP_BUSY or
ENGINE_BUSY.
0: External interrupt will be generated when STARTUP_BUSY
or ENGINE_BUSY condition is no longer true. Reading the
register 3A clears the status bits [5:4] and releases INT pin to
high state.
1
R/W
1: Interrupt events will be masked i.e. no external interrupt
will be generated from STARTUP_BUSY or ENGINE_BUSY
event (default).
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Table 45. STATUS / INTERRUPT Register
Register: 0x3A
STATUS / INTERRUPT
Bit Description
Bit
Bit Name
Default
Access
5
STARTUP_BUSY
A status bit which indicates that the device is running the
internal start-up sequence. Please note that STARTUP_BUSY
bit is always “1” when CHIP_EN bit is “0”. Please refer to
section 8.5 for detailed startup mode description.
0
R
0: internal start-up sequence completed.
1: internal start-up sequence running.
4
ENGINE_BUSY
A status bit which indicates that a program execution engine i
clearing internal registers. Serial bus master should not write
or read program memory, or registers 0x00, 0x37 to 0x3or
0x4C to 0x4E, when this bit is set to "1".
0
R
0: engine ready.
1: at least one of the engines is clearing inteal rgisters.
3
2
1
0
EXT_CLK_USED
ENG1_INT
This bit is high when external clock sgnal n CLK pin is
detected. CLK_ET_EN bit high in addess 36 enables the
clock detction.
0
0
0
0
R
R
R
R
0: xternal clock not detected.
1: eal clock detected
This ithe interrupt statubit for program execution engine 1.
The bit is set by END r INT instruction. Reading the interrupt
t clears the intept.
0: interrupt uns/clared.
1: interrupt se
ENG2_INT
This is he inerrupt status bit for program execution engine 2.
The bit iset by END or INT instruction. Reading the interrupt
brs the interrupt.
0: interrupt unset/cleared.
: interrupt set.
ENG3_INT
This is the interrupt status bit for program execution engine 3.
The bit is set by END or INT instruction. Reading the interrupt
bit clears the interrupt.
0: interrupt unset/cleared.
1: interrupt set.
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8.10.11 GPO
AS3661 has one General Purpose Output pin (GPO). Status of the pin can be controlled with this register. Also, INT
pin can be configured to function as a GPO by setting the bit EN_GPO_INT. When INT is configured to function as a
GPO, output level is defined by the VBAT voltage.
When INT pin’s GPO function is disabled, it operates as an open drain pin. INT signal is active low, i.e. when interrupt
signal is send, the pin is pulled to GND. External pull-up resistor is needed for proper functionality.
Table 46. GPO Register
Register: 0x3B
Bit Name
GPO
Bit
Default
Access
Bit Description
2
INT_CONF
This bit defines the function of GPO pin. It can either be
configures as interrupt pin or as general purpose output pin.
0
R/W
0: INT pin is set to function as an interrupt pin.
1: INT pin is configured to function as a GPO.
This register controls the state of pin GPO.
0: GPO pin state is low.
1
0
GPO
0
0
R/W
R/W
1: GPO pn statis high. GPO pin is a dgital CMOS output,
and no pldown esistor is needed.
INT_GPO
If Ipin is defined as general purpose output (INT_CONF bit
musto”1”), it is poble to control the INT pin with this
bit.
0: INT pin state is lo(if IT_CONF = 1).
INT pin state igh (iINT_CONF = 1).
8.10.12 VARIABLE
The variable can be sued to store datorder to controxample the data flow.
Table 47. GPO Register
Register: 0x3C
Bit Name
GPO
Bit
Default
Access
Bit Description
7:0
VARIABLE_D
These bits are used for storing a global 8–bit variable. Variable
can be used to control program flow.
0000 000
R/W
8.10.13 RESET
Table 48. RESET Register
Register: 0x3D
RESET
Bit
Bit Nme
Default
Access
Bit Description
7:0
RESET
Writing 11111111 into this register resets the AS3661. Internal
registers are reset to the default values. Reading RESET
register returns 00000011.
0000 0011
R/W
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8.10.14 TEMP ADC CONTROL
Table 49. TEMP ADC CONTROL Register
Register: 0x3E
TEMP ADC CONTROL
Bit Description
Bit
Bit Name
Default
Access
7
TEMP_MEAS_BUSY
Indicates the status of the temperature measurement ADC of
AS3661.
0
R
0: temperature measurements done or not activated.
1: temperature measurement active.
2
1
0
EN_TEMP_SENSOR
Every time when EN_TEMP_SENSOR is written high a new
measurement period is started. The length of the
measurement period depends on temperature. At 25°C
measurement takes 20 milliseconds. Temperature can be ead
from register 0x3F.
0
0
R/W
R/W
0: temperature sensor disabled.
1: enable internal temperature sensor and start measurement.
CONTINUOUS_CON
V
When ENTEMP_SENSOR bit is set t1” it is possible to
enable a ontinus temperature converstion setting the
CONTINUUS_CONV bit in this eisr.
0: mperature measurement period initiated during
starp or after exit from ower save mode.
1: coninuous temperature measurement. Not active when the
device is in powersave
SEL_EXT_TEMP
It is possible to the temperature compensation register
either to thnteral temperature measurement result register
0x3F or to the EMPERATURE WRITE register 0x40. This
register can be sued to store the temperature of an external
temperaure measurement device to AS3661 in order to use it
fD temperature compensation.
0
R/W
0: perature compensation source register addr 3FH.
temperature compensation source register addr 40H.
8.10.15 TEMPERATURE READ
Table 50. TEMPERATURE READ Regist
Register: 0x3F
TEMPERATURE READ
Bit Description
Bit
Bit Name
Default
Access
7:0
TEMPERATURE
_READ
These bits are used for storing an 8-bit temperature reading
acquired from the internal temperature sensor. This register is
a read-only register. Temperature reading is stored in 8-bit
two's complement format, see the table below.
1101 1010: -38°C
...
0001 1001
R
0001 1001: 25°C
...
0101 1000: 88°C
0101 1001: 89°C
Note: When writing temperature data outside the range of the temperature compensation: Values greater than 89°C
will be set to 89°C; values less than -38°C will be set to -38°C.
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8.10.16 TEMPERATURE WRITE
Table 51. TEMPERATURE WRITE Register
Register: 0x40
TEMPERATURE WRITE
Bit Description
Bit
Bit Name
Default
Access
7:0
TEMPERATURE
_WRITE
These bits are used for storing an 8-bit temperature reading
acquired from an external temperature sensor, if such a sensor
is used. Temperature reading is stored in 8-bit two's
complement format, see the table below.
1101 1010: -38°C
...
0000 0000
R/W
0001 1001: 25°C
...
0101 1000: 88°C
0101 1001: 89°C
Note: When writing temperature data outside the range of the mpeture compensation: Vaues greater than 89°C
will be set to 89°C; values less than -38°C will be set to 8°C.
8.10.17 LED TEST CONTROL
Table 52. LED TEST CONTROL Register
Register: 0x41
Bit Name
LED TEST CNTROL
Bit Description
Bit
Default
Access
7
EN_LED_TEST
_ADC
Writing this high (1) fires single LED test conversation. Thus
each time you nt to start a conversion it is necessary to
write a 1” to his register. The measurement cycle is 2.7
millisecods per conversion.
0
R/W
test measurement disabled.
1: LED test measurement enabled
6
EN_LED_TEST_INT
This register enabled the interrupt for the LED test ADC.
Interrupt can be cleared by reading STATUS/INTERRUPT
register 0x3A.
0
R/W
0: no interrupt signal will be send to the INT pin when the
LED test is accomplished.
1: interrupt signal will be send to the INT pin when the LED test
is accomplished.
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Table 52. LED TEST CONTROL Register
Register: 0x41
LED TEST CONTROL
Bit Description
Bit
Bit Name
Default
Access
5
CONTINUOUS
_CONV
When EN_LED_TEST_ADC bit is set to”1”, it is possible to
enable a continuous conversation setting the
CONTINUOUS_CONV bit to “1” in this register.
0
R/W
0: continuous conversion is disabled.
1: continuous LED test measurement. Not active in powersave
mode.
4:0
LED_TEST_CTRL
These bits are used for choosing the LED driver output to be
measured with the LED test ADC. In addition to the LED
outputs is is possible to measure VDD , INT-pin and chage-
pump output voltage as well.
0 0000: LED1
0 0001: LED2
0 0010: LED3
0 0011: LD4
0 0100: LED5
0 0000
R/W
0 0ED6
0 01: LED7
0 0111: LED8
1000: LED9
0 1001 to 0 1110esrved, do not use
0 1111: VCP
1 000VBA
1 1: INT-pin
1to 11111: reserved, do not use
8.10.18 LED TEST ADC
Table 53. LED TEST ADC Register
Register: 0x42
LED TEST ADC
Bit Description
Bit
Bit Name
Default
Access
7:0
LED_TEST_ADC
This is used to store the LED test result. Read-only register.
LED test ADC least significant bit corresponds to 30mV. The
measured voltage V (typ.) is calculated as follows: V =
(RESULT(DEC) x 0.03 - 1.478 V. For example, if the result is
10100110 = 166(DEC), the measured voltage is 3.50V
(typ.)(see Figure 28 on page 58).
N/A
R
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Figure 28. LED Test Results vs. Measured Voltage
5
4
3
2
1
0
40
90
140
190
RESULT (DEC)
8.10.19 ENGINE1 VARIABLE A
Table 54. ENGINE1 VARIABLE A Register
Register: 0x45
ENGINE1 VARIABLE A
Bit Description
Bit
Bit Name
Default
Access
7:0
ENGINE1_
VARIABLE_A
These bitare used for engine 1 s a local variable. The
regter is a read only register and can be used for example for
aritperations with e program execution engine.
0000 0000
R
8.10.20 ENGINE2 VARIABLE A
Table 55. ENGINE2 VARIABLE A Register
Register: 0x46
ENGNE2 VARIABLE A
Bit Description
Bit
Bit Name
Default
Access
7:0
ENGINE2_
VARIABLE_A
These bts are used for engine 2 as a local variable. The
rr is a read only register and can be used for example for
atic operations with the program execution engine.
0000 0
R
8.10.21 ENGINE3 VARIABLE A
Table 56. ENGINE3 VARIABLE A Register
Register: 0x47
ENGINE3 VARIABLE A
Bit Description
Bit
Bit Name
efault
Access
7:0
ENGINE3_
VARIABLE_A
These bits are used for engine 3 as a local variable. The
register is a read only register and can be used for example for
arithmetic operations with the program execution engine.
000 0000
R
8.10.22 MASTER FADER1
Table 57. MASTER FADER1 Register
Rster: 0x48
MASTER FADER1
Bit Description
Bit
Bit Name
Default
Access
7:0
MASTER_FADER1
An 8-bit register to control all the LED-drivers mapped to
MASTER FADER1. Master fader allows the user to control
dimming of multiple LEDS with a single serial bus write. This is
a faster method to control the dimming of multiple LEDs
compared to the dimming done with the PWM registers
(address 0x16 to 0x1E), which would need multiple writes.
0000 0000
R/W
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8.10.23 49 MASTER FADER2
Table 58. MASTER FADER2 Register
Register: 0x49
MASTER FADER2
Bit Description
Bit
Bit Name
Default
Access
7:0
MASTER_FADER2
An 8-bit register to control all the LED-drivers mapped to
MASTER FADER2. Master fader allows the user to control
dimming of multiple LEDS with a single serial bus write. This is
a faster method to control the dimming of multiple LEDs
compared to the dimming done with the PWM registers
(address 0x16 to 0x1E), which would need multiple writes.
0000 0000
R/W
8.10.24 4A MASTER FADER3
Table 59. MASTER FADER3 Register
Register: 0x4A
MASTER FADER3
Bit Description
Bit
Bit Name
Default
Access
7:0
MASTER_FADER3
An 8-bit rgisteo control all the LED-dvers mapped to
MASTER FADER. Master fader allows the user to control
dimming of ultiple LEDS with a single serial bus write. This is
a fethod to controthe dimming of multiple LEDs
comed to the dimming dne with the PWM registers
(addrss 0x16 to 0x1E), hich would need multiple writes.
0000 0000
R/W
8.10.25 ENG1 PROG START ADDR
Table 60. ENG1 PROG START ADDR Regier
Register: 0x4C
ENG1 PROG START ADDR
Bit Description
Bit
Bit Name
Defa
Access
6:0
ENG1_PROG_
START_ADDR
gram memory start address for program execution
engine 1 is defined in this register.
000 0000
R/W
8.10.26 ENG2 PROG START ADDR
Table 61. ENG2 PROG START ADDR Reiste
Register: 0x4D
ENG2 PROG START ADDR
Bit Description
Bit
Bit Name
Defaut
Access
6:0
ENG2_PROG_
START_ADDR
The program memory start address for program execution
engine 2 is defined in this register.
00 0000
R/W
8.10.27 ENG3 POG START ADDR
Table 62. ENG2 PROG START ADDR Register
Reister: 0x4E
ENG3 PROG START ADDR
Bit Description
Bit
Bit Name
Default
Access
6:
ENG3_PROG_
START_ADDR
The program memory start address for program execution
engine 3 is defined in this register.
000 0000
R/W
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8.10.28 PROG MEM PAGE SELECT
Table 63. PROG MEM PAGE SEL Register
Register: 0x4F
PROG MEM PAGE SEL
Bit Description
Bit
Bit Name
Default
Access
2:0
PAGE_SEL
These bits select the program memory page. The program
memory is divided into six pages of 16 instructions; thus the
total amount of the program memory is 96 instructions.
000: Program Memory 0x00 - 0x0F selected.
001: Program Memory 0x10 - 0x1F selected.
010: Program Memory 0x20 - 0x2F selected.
011: Program Memory 0x30 - 0x3F selected.
100: Program Memory 0x40 - 0x4F selected.
101: Program Memory 0x50 - 0x5F selected.
000
R/W
8.10.29 ENG1 MAPPING MSB
Table 64. ENG1 MAPPING MSB Register
Register: 0x70
ENG1 MAPPING MSB
Bit
Bit Name
Default
Access
Bit escription
7
ENG1_GPO
0: GPO pin non-maped to the program exec. engine 1.
1: GPO pin is mapped o the program execution engine 1.
0: LED9 pin nomapped to the program exec. engine1.
1: LED9 pin imapped to the program execution engine 1.
0
R
0
ENG1_LED9
0
R
8.10.30 71H ENG1 MAPPING LSB
Table 65. ENG1 MAPPING LSB Register
Register: 0x71
ENG1 MAPPING LSB
Bit
Bit Name
Default
Access
Bit Description
7
ENG1_LED8
0: LED8 pin non-mapped to the program exec. engine 1.
1: LED8 pin is mapped to the program execution engine 1.
0: LED7 pin non-mapped to the program exec. engine 1.
1: LED7 pin is mapped to the program execution engine 1.
0: LED6 pin non-mapped to the program exec. engine 1.
1: LED6 pin is mapped to the program execution engine1.
0: LED5 pin non-mapped to the program exec. engine 1.
1: LED5 pin is mapped to the program execution engine 1.
0: LED4 pin non-mapped to the program exec. engine 1.
1: LED4 pin is mapped to the program execution engine 1.
0: LED3 pin non-mapped to the program exec. engine 1.
1: LED3 pin is mapped to the program execution engine 1.
0: LED2 pin non-mapped to the program exec. engine 1.
1: LED2 pin is mapped to the program execution engine 1.
0: LED1 pin non-mapped to the program exec. engine 1.
1: LED1 pin is mapped to the program execution engine 1.
0
R
6
5
4
3
2
1
0
ENG1_LED7
ENG1_LED6
ENG_LE5
ENG1LED4
ENG1_LED3
ENG1_LED2
ENG1_LED1
0
0
0
0
0
0
0
R
R
R
R
R
R
R
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8.10.31 ENG2 MAPPING MSB
Table 66. ENG2 MAPPING MSB Register
Register: 0x72
ENG2 MAPPING MSB
Bit Description
Bit
Bit Name
Default
Access
7
ENG2_GPO
0: GPO pin non-mapped to the program exec. engine 2.
1: GPO pin is mapped to the program execution engine 2.
0: LED9 pin non-mapped to the program exec. engine2.
1: LED9 pin is mapped to the program execution engine 2.
0
R
0
ENG2_LED9
0
R
8.10.32 ENG2 MAPPING LSB
Table 67. ENG2 MAPPING LSB Register
Register: 0x73
ENG2 MAPPING LSB
Bit
Bit Name
Default
Access
Bit Description
7
ENG2_LED8
0: LED8 pin non-mapped to the prgam exec. engine 2.
1: LED8 in is mpped to the program excution engine 2.
0: LED7 pino-mapped to the progam exec. engine 2.
1: Ln is mapped to he program execution engine 2.
0: LE6 pin non-mapped to the program exec. engine 2.
1: LED6 pin is mappto the program execution engine 2.
: LED5 pin noapped to the program exec. engine 2.
1: LED5 pis mpped to the program execution engine 2.
0: LED4 pin nn-mapped to the program exec. engine 2.
1: LEDpin is mapped to the program execution engine 2.
03 pin non-mapped to the program exec. engine 2.
1: 3 pin is mapped to the program execution engine 2.
LED2 pin non-mapped to the program exec. engine 2.
1: LED2 pin is mapped to the program execution engine 2.
0: LED1 pin non-mapped to the program exec. engine 2.
1: LED1 pin is mapped to the program execution engine 2.
0
R
6
5
4
3
2
1
0
ENG2_LED7
ENG2_LED6
ENG2_LED5
ENG2_LED4
ENG2_LED3
ENG2_LED2
ENG2_LED1
0
0
0
0
0
0
0
R
R
R
R
R
R
R
8.10.33 ENG3 MAPPING MSB
Table 68. ENG3 MAPPING MSB Register
Register: 0x74
ENG3 MAPPING MSB
Bit
Bit Nme
Default
Access
Bit Description
7
ENG3_GPO
0: GPO pin non-mapped to the program exec. engine 3.
1: GPO pin is mapped to the program execution engine 3.
0: LED9 pin non-mapped to the program exec. engine 3.
1: LED9 pin is mapped to the program execution engine 3.
0
R
0
ENG3_LED9
0
R
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8.10.34 ENG3 MAPPING LSB
Table 69. ENG3 MAPPING LSB Register
Register: 0x75
ENG3 MAPPING LSB
Bit Description
Bit
Bit Name
Default
Access
7
ENG3_LED8
0: LED8 pin non-mapped to the program exec. engine 3.
1: LED8 pin is mapped to the program execution engine 3.
0: LED7 pin non-mapped to the program exec. engine 3.
1: LED7 pin is mapped to the program execution engine 3.
0: LED6 pin non-mapped to the program exec. engine .
1: LED6 pin is mapped to the program execution engin3.
0: LED5 pin non-mapped to the program exec. engin3.
1: LED5 pin is mapped to the program executin engine 3.
0: LED4 pin non-mapped to the program xec. engine 3.
1: LED4 pin is mapped to the program exeution engine 3.
0: LED3 in nomapped to the progrm exec. engine 3.
1: LED3 pis mpped to the proram execution engine 3.
0: pin non-mapped to the program exec. engine 3.
1: LE2 pin is mapped to thprogram execution engine 3.
0: LED1 pin non-maped o the program exec. engine 3.
LED1 pin is mped tthe program execution engine 3.
0
R
6
5
4
3
2
1
0
ENG3_LED7
ENG3_LED6
ENG3_LED5
ENG3_LED4
ENG3_LED3
ENG3_LED2
ENG3_LED1
0
0
0
0
0
0
0
R
R
R
R
R
R
R
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8.10.35 GAIN CHANGE CTRL
With hysteresis and timer bits the user can optimize the charge pump performance to better meet the requirements of
the application at hand. Some applications need to be optimized for efficiency and others need to be optimized for
minimum EMI, for example.
Table 70. GAIN CHANGE CTRL Register
Register: 0x76
Bit Name
GAIN CHANGE CTRL
Bit Description
Bit
Default
Access
7:6
TRESHOLD
Bits set the threshold voltage at which the charge pump gain
changes from 1.5x to 1x. The threshold voltage is defined as
the voltage difference between highest voltage output (LED1
to LED6) and input voltage VBAT: VTRESHOLD = VBAT - MAX
(voltage on LED1 to LED6). If VTRESHOLD is larger than te se
value (100mV to 400mV), the charge pump is in 1x mod
00
R/W
00: 400mV
01: 300mV
10: 200mV
11: 100m
5
ADAPTIVE_
TRESH_EN
Gain chane hyeresis prevents hmode from toggling back
anth (1x -> 1.5x -> 1x...) , which would cause ripple on VIN
and flicker. When the daptive threshold is enabled, the
width f the hysteresis region epends on the choice of
TRESHOLD bits (see abov), saturation of the current
ources, charge pump oad current, PWM overlap and
emperature.
0
R/W
0: Adaptivhreshold disabled.
1: Adaptivthreshold enabled.
4:3
TIMER
A forcemode change from 1.5x to 1.0x is attempted at the
il specified with these bits. Mode change is allowed if
tenough voltage over the LED drivers to ensure proper
operation. Set FORCE_1x to "1" (see below) to activate this
fature.
00
R/W
00: 5ms
01: 10ms
10: 50ms
11: infinite
2
FORCE_1x
Activates forced mode change. In forced mode charge pump
mode change from 1.5x to 1x is attempted at the interval
specified with the TIMER bits.
0
R
0: forced mode changes disabled.
1: forced mode changes disabled.
Note: Vues above are typical and should not be used as product specification. Writing to TRESHOLD [7:6] bits by
user overrides factory settings. Factory settings aren't user accessible.
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8.11 Instruction Set
AS3661 has three independent programmable execution engines. All the program execution engines have their own program memory block allocated buser.
Note that in order to access program memory the operation mode needs to be load program, at least for one of the three program execution engines. Prm
execution is clocked with 32 768Hz clock. This clock can be generated internally or external 32 kHz clock can be connected to CLK32K pin. Usinextrnal clock
enables synchronization of LED timing to the external clock signal.
Supported instruction set is listed in the tables below:
Table 71. LED Driver Instructions
Bit Bit
Bit
Bit
Bit
Bit
Bit
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2
Bit
[1]
Bit
[0]
LED Driver
Instructions
Compiler
Command
[15] [14] [13] [12] [11] [10] [9]
pre-
ramp1
ramp2
RMP
RWV
0
1
step time
0
sign
0
# of incremes
scale
pre-
# of
increments
0
0
0
1
0
0
0
sign
step time
scale
set_pwm1
set_pwm2
wait
SPW
SPV
0
1
1
0
0
0
0
0
0
0
0
1
0
0
PWM value
0
0
1
0
1
0
0
0
0
0
0
0
PWM value
pre-
scale
WAIT
0
time
0
0
0
1. This opcode is used with numerical operands.
2. This opcode is used with variables.
Table 72. LED Mapping Instructions
Bit Bit
Bit
Bit
Bit
Bit
Bit
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2]
Bit
[1]
Bit
[0]
LED Mapping
Instructions
Compiler
Command
[15] [14] [13] [12] [11] [10] [9]
mux_ld_start
mux_map_start
mux_ld_end
mux_sel
MLS
MMS
MLE
MSL
MCL
MMN
MMP
MLN
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
1
0
0
1
1
1
SRAM address 0-95
LED select
mux_clr
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
mux_map_next
mux_map_prev
mux_ld_next
Table 72. LED Mapping Instructions
Bit Bit
Bit
Bit
Bit
Bit
Bit
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2]
Bit
[1]
Bit
[0]
LED Mapping
Instructions
Compiler
Command
[15] [14] [13] [12] [11] [10] [9]
mux_ld_prev
mux_ld_addr
mux_map_addr
MLP
MLA
MMA
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
0
1
1
0
0
0
0
0
1
SRAM address 0-95
Table 73. Branch Instructions
Bit Bit
Bit
Bit
Bit
Bit
Bit
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2
Bit
[1]
Bit
[0]
Compiler
Command
Branch Instructions
[15] [14] [13] [12] [11] [10] [9]
rst
RST
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
branch1
BRN
loop count
step umber
branch2
Int
BRV
1
0
0
0
0
0
0
1
1
step mber
loop count
INT
1
1
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
end
END
int reset
0
0
0
wafor trigger
send a trigger
E3
trigger
TRG
1
1
1
0
ext.tr
ext.tr
ig
x
x
E3
E2
E1
X
X
E2
E1
ig
0
0
0
0
jne
jl
JNE
JL
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
0
0
1
1
0
1
0
1
umber of instructions to be
pped if the operation returns
true
variable1
variable2
jge
je
JGE
JE
1. This opcode is used with numerical operands.
2. This opcode is used with variables.
Note: x stands for ‘don’t care’
Table 74. Data Transfer and Arithmetic Instructions
Bit Bit
Bit
Bit
Bit
Bit
Bit
Bit
[8]
Bit
[7]
Bit
[6]
Bit
[5]
Bit
[4]
Bit
[3]
Bit
[2]
Bit
[1]
Bit
[0]
Arithmetic
Instructions
Compiler
Command
[15] [14] [13] [12] [11] [10] [9]
ld
LD
1
1
0
0
0
0
1
1
0
0
0
1
8-bit value
8-bit value
add1
add2
sub1
sub2
ADN
target
variable
ADV
SBN
SBV
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
0
1
0
0
0
0
0
0
0
variable1
8-bit value
variabl1
varible2
variable2
1
1. This opcode is used with numerical operands.
2. This opcode is used with variables.
AS3661
Datasheet - Detailed Description
8.12 LED Driver Instructions
8.12.1 RAMP (Numerical Operands)
This is the instruction useful for smoothly changing from one PWM value into another PWM value on the LED1 to
LED9 outputs, in other words generating ramps (with a negative or positive slope). AS3661 allows programming very
fast and very slow ramps. Ramp instruction generates a PWM ramp, using the effective PWM value as a starting value.
At each ramp step the output is incremented /decremented by one unit, unless the step time span is 0 or # of
increments is 0. Time span for one ramp step is defined with prescale -bit [14] and step time -bits [13:9]. Prescale = 0
sets 0.49 ms cycle time and prescale = 1 sets 15.6 ms cycle time; so the minimum time span for one step is 0.49 ms
(prescale * step time span = 0.49ms x 1) and the maximum time span is 15.6 ms x 31 = 484ms/step If all the step tim
bits [13:9] are set to zero, output value is incremented / decremented during one prescale on the whole. Number of
increment’s value defines how many steps will be taken during one ramp instruction: Increment maximum value is
255d, which corresponds increment from zero value to the maximum value. If PWM reaches minimum/maximum val
(0/255) during the ramp instruction, ramp instruction will be executed to the end regardless of saturation. This eables
ramp instruction to be used as a combined ramp & wait instruction. Ramp instruction is the wait instruction whethe
increment bits [7:0] are set to zero.
COMPILER COMMAND SYNTAX: RMP, prescale[1], step time[4], sign[1], number of increments[8
Table 75. RMP Parameter Description
Name
prescale
step time
sign
Value
Description
0
1
Divides master clock (3768 Hz) by 16 = 204Hz -0.488 ms cycle time
Divides master c2 768 Hz) by 512 = 64 Hz -> 15.625 ms cycle time
One ramincrement done in (stp time) x (prescale).
Increase PWM output
0-31
0
1
Decse PWM output
Thnumer of incremenecrement cycles. Note: Value 0 takes the same
time as incremeby 1, but it is the wait instruction.
# of increments
0-255
8.12.1.1 RMP Application Examp
Let's say that the LED dimming is controlled according near scale and effective PWM value at the moment t=0
is 140d (~55%,), as shown in the figure below, and we wat to reach a PWM value of 148d (~58%) at the moment t =
1.5s. The parameters for the RAMP instruction wibe:
ꢀ
ꢀ
ꢀ
ꢀ
Prescale = 1 (15.625 ms cycle time)
Step time = 12 (step time span will be 12*5.625 ms = 187.5 ms)
Sign = 0 (increase PWM output)
Number of increments = 8 (tae 8 steps)
COMPILER COMMAND SYNTX EXAMPLE: RMP, 1, 12, 0, 8;
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Figure 29. RAMP Instruction Example
8.12.2 RAMP (Variables)
Programming ramps with variables is very similar to programminramwith numerical operans. The only difference
is that step time and number of increments are captured from vaable registers, when the instruction execution is
started. If the variables are updated after starting the instruction execution, it will have no effet on instruction
execution. Again, at each ramp step the output is incremecremented by oe unless step time is 0 or increment
is 0. Time span for one step is defined with prescale and stetime bits. Step time is defined with variable A, B, C or D.
Variables A, B and C are set with ld-instruction. Variable D is global variable ancan be set by writing the VARIABLE
register (address 0x3C). LED TEST ADC register (address 0x42) can be useas a source for the variable D, as well.
Note: Variable A is the only local variable which cabe rad throughout tseril bus. Of course, the variable stored in
3CH can be read (and written), too. Setting regiter 0x06, 0x07, or 0x0it LOG_EN high/low sets logarithmic (1) or
linear ramp (0). By using the logarithmic ramsettng the visual eft appears like a linear ramp, because the human
eye behaves in a logarithmic way.
COMPILER COMMAND SYNTAX: RW, prescale[1], sign[1], tep time[2], number of increments[2];
Table 76. RWV Parameter Descriptio
Name
Value
Description
Divides mastr clock (32 768 Hz) by 16 = 2048 Hz -> 0.488 ms cycle time
Divdes master clock (32 768 Hz) by 512 = 64 Hz -> 15.625 ms cycle time
Increase PWM output
0
1
0
1
prescale
sign
Decrease PWM output
One ramp increment done in (step time) x (prescale).
Step time is loaded with the value (5 LSB bits) of the variable defined below.
1
2
3
local variable A
local variable B
local variable C
step time
0-3
register address 3CH variable D value, or register address 42H
value.
4
The value of the variable should be from 00001b to 11111b (1d to 31d) for
correct operation.
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Table 76. RWV Parameter Description
Name
Value
Description
The number of increment/decrement cycles. Value is taken from variable
defined below:
0
1
2
local variable A
local variable B
local variable C
# of increments
0-3
register address 0x3C variable D value, or register address 0x42
value.
3
8.12.2.1 RWV Application Example
Let's say that the LED dimming is controlled according to the linear scale and effective PWM value at the moment t=0
is 0d (0%,) and we want to reach a PWM value of 255d (100%) at the moment t = 3s. The parameters for the RMP
instruction will be:
ꢀ
ꢀ
ꢀ
ꢀ
Prescale = 0 (0.488 ms cycle time)
Step time = 4 (use variable D in register 0x3C with a value of 24d)
Sign = 0 (increase PWM output)
Number of increments = 0 (use local variable A which must bloadd with the value 25d
COMPILER COMMAND SYNTAX EXAMPLE: RMP, 0, 0,
The example above gives us a ramp time of 2.987s (tr = 0.48ms * 24 * 255).
Figure 30. Ramp Instruction Example with Variabes
8.12.3 SET PWM (Numrical Operands)
This instruction is ed fsetting the PWM value on the outputs LED1 to LED9 without any ramps. Set PWM output
value from 0 to 255 wth PWM value bits [7:0]. Instruction execution takes sixteen 32 kHz clock cycles (=488µs) .
COMPICOMMAND SYNTAX: SPW, PWM Value[8];
Tale 77. SPW Parameter Description
Name
Value
Description
PWM Value
0-255
PWM output duty cycle 0 - 100%
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8.12.3.1 SPW Application Example
The SPW command can be used to set the PWM duty cycle of the program execution engine. In the following example
we want to set the duty cycle of the PWM output to 55% like in the ramp example in the previous section. The right
PWM value can be calculated with the following formula:
PWM value = (Duty Cycle * 255 / 100) = 55% * 255 / 100 = 140.
The predefined PWM value can be used as a starting point for dimming LEDs for example.
COMPILER COMMAND SYNTAX: SPW, 140;
8.12.4 SET PWM (Variables)
This instruction is used for setting the PWM value on the outputs LED1 to LED9 without any ramps. In comparison to
the SPW command, this command is in combination with variables similar to the RWM example in one of the previou
sections.
COMPILER COMMAND SYNTAX: SPV, Variable[2];
Table 78. SPW Parameter Description
Name
Value
Description
0
1
2
3
local variable A
local variable B
Variable
0-3
global variable C
register adCH variable D aue, or register address 42H value.
8.12.4.1 SPV Application Example
The purpose of the SPV command is basically the saone like with the SPW command in the previous section. The
only difference is that this command allows the user the control the PWduty cycle with the variables of the chip.
COMPILER COMMAND SYNTAX EXAMPL: SPW, 0;
The example above shows the control of te duty cycle with the loal variable A. If the local variable is for example
loaded with a value of 100, the duty cye of the PWM output set to 39.2%.
8.12.5 WAIT
When a wait instruction is executed, the engine is et in a wait status and the PWM values on the outputs are frozen.
This can be used for example to keep the LEDs eablefor a certain period of time before another up/down dimming
process is being initiated.
COMPILER COMMAND SYNTAX: WAIT, precale[1], time[5];
Table 79. WAIT Parameter Description
Name
Pre-scale
time
Value
0
Description
Divide master clock (32 768 Hz) by 16 which means 0.488 ms cycle time.
Divide master clock (32 768 Hz) by 512 which means 15.625 ms cycle time.
Total wait time will be = (time) x (prescale). Maximum 484 ms, minimum 0.488 ms.
1
1-31
8.12.5.1 WAIT Appication Example
In the examplshown below we want to have a target wait time of 125ms after dimming up the LEDs. In order to get
the 100elay we select a prescaler value “1”, which gives a cycle time of 15.625ms. If we divide the 100ms by the
cle timwe get the right value for the time parameter which is 8.
COPILER COMMAND SYNTAX EXAMPLE: WAIT, 1, 8;
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8.13 LED Mapping Instructions
These instructions define the engine-to-LED mapping. The mapping information is stored in a table, which is stored in
the SRAM (program memory of the AS3661). AS3661 has three program execution engines which can be mapped to
9 LED drivers or to one GPO pin. One engine can control one or multiple LED drivers. The first part of the program
memory of AS3661is usually used for LED driver programs of each sequencer. The LED mapping is usually put at the
end of the program memory where the programmable multiplexer, shown in the block diagram below, gets the
information which LED must be connected to what sequencer output.
Figure 31. LED Mapping Memory allocation
In order to control and define the mapping of the LEDs there are totally en instructions for the engine-to-LED-driver
control: mux_ld_start, mux_map_start, mux_ld_ed, mux_sel, muxlr, mx_map_next, mux_map_prev, mux_ld_next,
mux_ld_prev, mux_ld_addr and mux_map_adr. With these instructios it is also possible to change the LED mapping
from one mapping to another mapping, whch has been defined in he LED mapping table, forth and back to create
again more complex light patterns.
8.13.1 MUX_LD_START
Mux_ld_start defines the start of the mapping tabllocation in the memory.
COMPILER COMMAND SYNTAX: MLS, SRAM adress[7];
Table 80. MLS Parameter Description
Name
Value
Description
SRAM address
0-95
Mapping table start address
8.13.1.1 MLS Application Example
In this example we want set he start address for the LED mapping table to 80d.
COMPILER COMMAND SYNTAX EXAMPLE: MLS, 80;
8.13.2 MUX_LD_ED
Mux_ld_end dfinethe end of the mapping table location in the memory. It is very important to define the end address
of the mng table, otherwise it could happen if you use relative mapping commands, that the address pointer points
to a posn utside the mapping table due to the missing end address.
COPILER COMMAND SYNTAX: MLE, SRAM address[7];
Table 81. MLE Parameter Description
Name
Value
Description
SRAM address
0-95
Mapping table end address
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8.13.2.1 MLE Application Example
In this example we want to set the end address for the LED mapping table to 85d.
COMPILER COMMAND SYNTAX EXAMPLE: MLE, 85;
8.13.3 MUX_MAP_START
Mux_map_start defines the mapping table start address in the memory and the first row of the table will be activated
(mapped) at the same time.
COMPILER COMMAND SYNTAX: MMP, SRAM address[7];
Table 82. MMP Parameter Description
Name
Value
Description
SRAM address
0-95
Mapping table start address
8.13.3.1 MMP Application Example
In the example we would like to set the start address to 80d. In addition to the definition of the stat adess of the
mapping table the first LED mapping defined at address 80d gets activated. The difference to the MSX_D_START
command, described in one of the previous sections, is that it only defines the start address withot actiating the LED
mapping.
COMPILER COMMAND SYNTAX EXAMPLE: MMP, 80;
8.13.4 MUX_SEL
With mux_sel instruction one, and only one, LED driver (or e GPO-pin) can be conected to a program execution
engine. Connecting multiple LEDs to one engine is done with he mapping table. fter the mapping has been released
from an LED, PWM register value will still control the LED brightness. If the apping is released from the GPO pin,
serial bus control takes over the GPO state.
COMPILER COMMAND SYNTAX: MSL, LED Sect[6]
Table 83. MSL Parameter Description
Name
Value
Description
no drivers selected
LED1 selected
LED2 selected
....
LED Select
0-16
0
1
2
....
1
GPO
8.13.4.1 MSL Application Exmpl
In this example we would like to use the MSL command to map a single LED to a execution engine. Usually we do this
with the mapping table buin case we want to use only a single LED on one sequencer it is possible to use the MSL
command. The example ommand below shows the mapping of LED2 to the program execution engine.
COMPILER COMANSYNTAX EXAMPLE: MSL, 2;
8.13.5 MUX_CLR
Mux_clr clearengne-to-driver mapping. After the mapping has been released from an LED, PWM register value will
still conthe LED brightness. If the mapping is released from the GPO pin, serial bus control takes over the GPO
stte.
COPILER COMMAND SYNTAX: MCL;
This command doesn’t support any parameters.
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Datasheet - Detailed Description
8.13.6 MUX_MAP_NEXT
This instruction sets the next row active in the mapping table each time it is called. For example, if the 1st row is active
at this moment, after mux_map_next instruction call the 2rd row will be active like in the block diagram shown in
Figure 32 below.
Figure 32. MUX_MAP_NEXT Command
If the mapping table end address is reached, activation will l to the mapping table tart address next time when the
mux_map_next instruction is called. Engine will not push a new PWM value to thLED driver output before set_pwm
or ramp instruction is executed. If the mapping habeen released from an LE, the value in the PWM register will still
control the LED brightness. If the mapping is released fom the GPO perial bus control takes over the GPO state.
COMPILER COMMAND SYNTAX: MMN;
This command doesn’t support any parameters
8.13.7 MUX_MAP_PREV
This instruction sets the previous row active in the mapble each time it is called. For example, if the 3rd row is
active at this moment, after mux_map_prev instruction call the 2nd row will be active like in block diagram shown in
Figure 33 below.
Figure 33. MUX_MAP_PREV Command
Figure 34.
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Datasheet - Detailed Description
If the mapping table start address is reached, activation will roll to the mapping table end address next time the
mux_map_prev instruction is called. Engine will not push a new PWM value to the LED driver output before set_pwm
or ramp instruction is executed. If the mapping has been released from an LED, the value in the PWM register will still
control the LED brightness. If the mapping is released from the GPO pin, serial bus control takes over the GPO state.
COMPILER COMMAND SYNTAX: MMP;
This command doesn’t support any parameters.
8.13.8 MUX_LD_NEXT
Similar than the mux_map_next instruction, but only the index pointer will be set to point to the next row i.e. no
mapping will be set and the engine-to-LED-driver connection will not be updated.
COMPILER COMMAND SYNTAX: MLN;
This command doesn’t support any parameters.
8.13.9 MUX_LD_PREV
Similar than the mux_map_prev instruction, but only the index pointer will be set to point to the previos row i.e. no
mapping will be set and the engine-to-LED-driver connection will not be updated.
COMPILER COMMAND SYNTAX: MLP;
This command doesn’t support any parameters.
8.13.10 MUX_MAP_ADDR
Mux_map_addr sets the index pointer to point the mappinrow defined by its [6:0] and sets the row active.
Engine will not push a new PWM value to the LED driver ouut before set_pwm or amp instruction is executed. If the
mapping has been released from an LED, the value in the PM register will till ontrol the LED brightness. If the
mapping is released from the GPO pin, serial bus control takes over the GPstate
COMPILER COMMAND SYNTAX: MMA, SRAM addres[7];.
Table 84. MMA Parameter Description
Name
Value
Description
SRAM address
0-95
Any SRM address containing mapping data.
8.13.10.1 MMA Application Example
In this example we asume the we have aleady defned e start and end address of the LED mapping table. Now we
want to set address 83d within the addresrange of the map table active.
COMPILER COMMAND SYNTAX EXAMPLEMMA, 83;
8.13.11 MUX_LD_ADDR
Mux_ld_addr sets the index pointr to point the mapping table row defined by bits [6:0], but the row will not be set
active.
COMPILER COMMAND SYTAXMLA, SRAM address;
Table 85. MLA Parameter Description
Name
Value
Description
SRAM address
0-95
Any SRAM address containing mapping data.
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AS3661
Datasheet - Detailed Description
8.14 Branch Instructions
8.14.1 RST
RST instruction resets Program Counter register (address 37H, 38H, or 39H) and continues executing the program
from the program start address defined in 4C-4E. Instruction takes sixteen 32 kHz clock cycles.
COMPILER COMMAND SYNTAX: RST;
This command doesn’t support any parameters.
Note: The default value for all program memory registers is 0000H, which is the RST instruction.
8.14.2 BRANCH (Numerical)
Branch instruction is mainly indented for repeating a portion of the program code several times. Branch instructio
loads step number value to program counter. Loop count parameter defines how many times the instructions insde t
loop are repeated. AS3661 supports nested looping i.e. loop inside loop. The number of nested loops is not limied.
Instruction takes sixteen 32 kHz clock cycles.
COMPILER COMMAND SYNTAX: BRN, loop count[6], step number[7];
Table 86. BRN Parameter Description
Name
Accepted Value
Description
loop count
step number
0-63
0-95
The number ooops be done. 0 means n infinite loop
The number to be loaded to program counter
8.14.2.1 BRN Application Example
In this application example we would like to create an infinite loop, which meas the loop will never stop. The code we
want to repeat has a start address of 10d. At the end of he code we warepeat we put the BRN command with the
program counter address 10d. Once the program execution enginexetethe BRN command the program counter
jumps back to address 10d and starts exeutg the code from this adress until it reaches again the BRN command.
COMPILER COMMAND SYNTAX: EXAMLE: BRN, 0, 10;
Figure 35. BRN Example for executiongine 1
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Datasheet - Detailed Description
8.14.3 BRANCH (Variables)
The BRANCH command for variables has basically the same functionality like the numerical command. The only
difference is that the loop count is controlled with variables instead of having a fixed number.
COMPILER COMMAND SYNTAX: BRV, step number[7], loop count[2];
Table 87. BRN Parameter Description
Name
Accepted Value
Description
step number
0-95
The step number to be loaded to program counter
Selects the variable for step number value. Step number is loaded with the
value of the variable defined below
0
1
2
3
local variable A
local variable B
loop count
0-3
local variable C
register address 3CH variable D value, or registeaddess 42H value
8.14.4 INT
Send interrupt to processor by pulling the INT pin down and settng corsponding status bit hig. Interrupt can be
cleared by reading interrupt bits in STATUS/INTERRUPT registeat addess 3A.
COMPILER COMMAND SYNTAX: INT;
This command doesn’t support any parameters.
8.14.5 END
End program execution. Instruction takes sixteen 2 kHclock cycles.
COMPILER COMMAND SYNTAX: END, int[1], eset[1];
Table 88. END Parameter Description
Name Value
Dscription
0
No errupt will be sWM register values will remain intact.
Reset program counter value to 0 and send interrupt to processor by pulling the INT pin down and
setting corresponding status bihigh o notify that program has ended. PWM register values will
remain intact. Interrupt can be clereby reading interrupt bits in STATUS/INTERRUPT register at
address 3A.
int
1
0
Reset program cuntevalue to 0 and hold. PWM register values will remain intact.
Reset program countelue to 0 and hold. PWM register values of the non-mapped drivers will
remain. PWM reister values of the mapped drivers will be set to "0000 0000". On completion of int
instruction witthis it set to "1" the master fader registers are set to zero as follows: Program
execution engie 1 sets MASTER FADER 1 (48H) to zero, engine 2 sets MASTER FADER 2 (49H) to
zero and engine 3 sets MASTER FADER 3 (4AH) to zero.
Reset
1
8.14.5.1 END Application Example
The example code elow sends an interrupt to the processor and resets the program counts to 0. The program
execution engine is st on hold.
COMPILER COMMAND SYNTAX EXAMPLE: END, 1, 0;
8.4.6 IGGER
Waior send triggers can be used to e.g. synchronize operation between the program execution engines. Send trigger
instrucion takes sixteen 32 kHz clock cycles and wait for trigger takes at least sixteen 32 kHz clock cycles. The
receiving engine stores the triggers which have been sent. Received triggers are cleared by wait for trigger instruction.
Wait for trigger instruction is executed until all the defined triggers have been received (note: several triggers can be
defined in the same instruction).
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Datasheet - Detailed Description
External trigger input signal must stay low for at least two 32 kHz clock cycles to be executed. Trigger output signal is
three 32 kHz clock cycles long. External trigger signal is active low, i.e. when trigger is send/received the pin is pulled
to GND. Sent external trigger is masked, i.e. the device which has sent the trigger will not recognize it. If send and wait
external trigger are used on the same instruction, the send external trigger is executed first, then the wait external
trigger.
COMPILER COMMAND SYNTAX: TRG, wait for trigger[6], send a trigger[6]
Table 89. TRG Parameter Description
Name
Value
Description
Wait for trigger from the engine(s). Several triggers can be defined in the
same instruction. Bit [7] engages engine 1, bit [8] engine 2, bit [9] engine 3
and bit [12] is for external trigger I/O. Bits [10] and [11] are not in use.
wait for trigger
0-31
Send a trigger to the engine(s). Several triggers can be defined in the sam
instruction. Bit [1] engages engine 1, bit [2] engine 2, bit [3] engine 3 ad bit
[6] is for external trigger I/O. Bits [4] and [5] are not in use.
send a trigger
0-31
8.14.6.1 TRG Application Example
In this example we want to wait/receive a trigger from program execution engine 1.
COMPILER COMMAND SYNTAX EXAMPLE: TRG, 2, 0;
8.14.7 JNE/JL/JGE/JE
AS3661 instruction set includes the following conditional jstructions: jne (jmp if not equal); jge (jump if greater
or equal); jl (jump if less); je (jump if equal). If the condition rue a certain number of instructions will be skipped (i.e.
the program jumps forward to a location relative to the preset location). If condion is false then the next instruction
will be executed.
COMPILER COMMAND SYNTAX: JNE, number of insuctions...[5], Vble1[2], Variable2[2];
COMPILER COMMAND SYNTAX: JL, number of nstructions...[5ariale1[2], Variable2[2];
COMPILER COMMAND SYNTAX: JGE, umbr of instructions.[5], Vriable1[2], Variable2[2];
COMPILER COMMAND SYNTAX: Eumber of instructions.[5], Variable1[2], Variable2[2];
Table 90. JNE/JL/JGE/JE Parameter scription
Name
Value
Description
number of instructions to be
skipped if the operation
returns true.
The number of instructions to be skipped when the statement is true.
Note: value 0 means redundant code.
0-31
Defines the variable to be used in the test:
local variable A
0
1
2
Variable1
Variale2
0-
0-3
local variable B
global variable
C3
register address 3CH variable, or register address 42H value
Defines the variable to be used in the test:
local variable A
0
1
local variable B
2
global variable
C3
register address 3CH variable, or register address 42H value
8.14.7.1 JNE Application Example
In the following example we compare local variable A with local variable B. If the value of the two registers is not equal
the command will skip three instructions.
COMPILER COMMAND SYNTAX EXAMPLE: JNE, 3, 0,1;
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Datasheet - Detailed Description
8.15 Arithmetic Instructions
8.15.1 LD
This instruction is used to assign a value into a variable; the previous value in that variable is overwritten. Each of the
engines have two local variables, called A and B. The variable C is a global variable which is shared with all three
program execution engines.
COMPILER COMMAND SYNTAX: LD, Target Variable[2];
Table 91. LD Parameter Description
Name
Value
Description
variable A
0
1
2
Target Variable
8-bit value
0-2
variable B
variable C
0-255
variable value
8.15.1.1 LD Application Example
In this example we want to load variable B with a value of 100;
COMPILER COMMAND SYNTAX EXAMPLE: LD, 1, 100;
8.15.2 ADD (Numerical Operands)
Operator either adds the 8-bit value to the current value of ttarget variable.
COMPILER COMMAND SYNTAX: ADN, Target Variable,[2], 8-Bit value[8];
Table 92. ADN Parameter Description
Name
Value
Description
Variable value
variable A
8-bit value
0-255
0
1
Target Variable
Variable1
0-2
0-3
variable B
2
variable C
0
local variable A
1
local variable B
global variable
3
0
register address 3CH variable, or register address 42H value
local variable A
1
local variable B
0-3
Variable2
2
global variable
C3
register address 3CH variable, or register address 42H value
8.15.2.1 ADApplication Example
In this exple we would like to add a value of100 d to variable ‘A’, which is loaded with a value of 10d. The result of
the opeon s 110d stored in variable ‘A’.
COMPILER COMMAND SYNTAX EXAMPLE: ADN, 0, 100;
8.15.3 ADD (Variables)
This command adds the value of the variable 1 (A, B, C or D) to the value of the variable 2 (A, B, C or D) and stores the
result in the register of variable A, B or C which is defined as target variable. Variables overflow from 255 to 0.
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Datasheet - Detailed Description
COMPILER COMMAND SYNTAX: ADV, Target Variable[2], Variable1[2], Variable2[2];
Table 93. ADV Parameter Description
Name
Value
Description
variable A
0
1
Target Variable
0-2
variable B
2
variable C
0
local variable A
1
local variable B
global variable
Variable1
Variable2
0-3
0-3
2
C3
0
register address 3CH variable, or register address 42H vaue
local variable A
1
local variable B
2
global variable
C3
register addrss 3CH variable, or registaddrss 42H value
8.15.3.1 ADV Application Example
In this example we want to add variable ‘A’ to variable ‘B’. esult should be sored in variable ‘C’.
COMPILER COMMAND SYNTAX EXAMPLE: ADV, 2, 0, 1
8.15.4 SUB (Numerical)
SUB Operator either subtracts the 8-bit value from the urrent value of target variable.
COMPILER COMMAND SYNTAX: SBN, Taget ariable[2], 8-bit lue[8];
Table 94. SBN Parameter Description
Name
Value
Description
8-bit value
0-255
variable value
0
1
2
variable A
Target Variable
0-2
variable B
variable C
8.15.4.1 SBN Application Example
In this example we would like to sbtra50d from local variable ‘A’. The result is stored in variable ‘A’.
COMPILER COMMAND SYNTX EXAMPLE: SBN, 0, 50;
8.15.5 SUB (Variables
The SBV commad subracts the value of the variable 2 (A, B, C or D) from the value of the variable 1 (A, B, C or D)
and stores the resuin the register of target variable (A, B or C). Variables overflow from 0 to 255.
COMPILER COMMAND SYNTAX: SBV, Target Variable[2], Variable1[2], Variable2[2];
Table 95BV Parameter Description
Name
Value
Description
variable A
0
1
2
Target Variable
0-2
variable B
variable C
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Datasheet - Detailed Description
Table 95. SBV Parameter Description
Name
Value
Description
0
1
local variable A
local variable B
global variable
Variable1
0-3
2
C3
0
register address 3CH variable, or register address 42H value
local variable A
1
local variable B
Variable2
0-3
2
global variable
C3
register address 3CH variable, or register address 42H vaue
8.15.5.1 SBV Application Example
In this example we would like to subtract variable ‘A’ from variable ‘B’. The result should be stored n vaable ‘C’.
COMPILER COMMAND SYNTAX EXAMPLE: SBV, 2, 0, 1;
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AS3661
Datasheet - Typical Application
9 Typical Application
Figure 36. Typical Application 3 RGB LEDs
O P G
D N
2 E
D
- 1 C
4 B
+ 1 C
5 B
- 2
4 A
+ 2 C
5 A
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AS3661
Datasheet - Typical Application
9.1 Recommended External Components
The AS3661 requires 4 external capacitors for proper operation. Surface-mount multi-layer ceramic capacitors are
recommended. Tantalum and aluminium capacitors are not recommended because of their high ESR. For the flying
capacitors (C1 and C2) multi-layer ceramic capacitors should always be used. These capacitors are small, inexpensive
and have very low equivalent series resistance (ESR <20mΩ typ.). Ceramic capacitors with X7R or X5R temperature
characteristic are preferred for use with the AS3661. These capacitors have tight capacitance tolerance (as good as
±10%) and hold their value over temperature (X7R: ±15% over -55°C to 125°C; X5R: ±15% over -55°C to 8 5°C).
Capacitors with Y5V or Z5U temperature characteristic are generally not recommended for use with the AS3661.
Capacitors with these temperature characteristics typically have wide capacitance tolerance (+80%, -20%) and vary
significantly over temperature (Y5V: +22%, -82% over -30°C to +85°C range; Z5U: +22%, -56% over +10°C to +85°C
range). Under some conditions, a nominal 1µF Y5V or Z5U capacitor could have a capacitance of only 0.1µF. Such
detrimental deviation is likely to cause Y5V and Z5U capacitors to fail to meet the minimum capacitance requirement
of the AS3661. For proper operation it is necessary to have at least 0.24 µF of effective capacitance for each of the
flying capacitors under all operating conditions. The output capacitor CVCPOUT directly affects the magnitude of he
output ripple voltage. In general, the higher the value of CVCPOUT, the lower the output ripples magnitude. For pper
operation it is recommended to have at least 0.50µF of effective capacitance for CVBAT and CVCPOUunder all
operating conditions. The voltage rating of all four capacitors should be 6.3V; 10V is recommende. Reommended
External Components below lists recommended external components from some leading ceramic caacitor
manufacturers. It is strongly recommended that the AS3661 circuit be thoroughly evaluated early the design-in
process with the mass-production capacitors of choice. This will elp ensure that any variabilitin capacitance does
not negatively impact circuit performance.
Figure 37. Recommended External Components
ndor
Model
1µF for CVBAT and CVCPOUT
C1005X5R1A105K
LMK105BJ105KV-F
ECJ0EB1A105M
Type
Voltge Ring
0V
Package Size
0402
Ceramic X5R
CeramiXR
Ceramic X5R
TDK
Taiyo ude10
Panason10V
0402
0402
Ceraic X5R, array
oo
ECJUVBPA105
Pnasoic 10V
0504
470F for CFLY1 and CFLY2
C1005X5R1A474K
LMK105BJ474KV-F
ECJ0EB0J474K
Ceramic X5R
Ceramic X5
Ceramic X5R
DK
10V
0402
0402
0402
Taiyo Yuden 10V
Panasonic 6.3V
User defined. Note that D7, D8 and D9 outputs are
powered from VBAT when specifying the LEDs.
LEDs
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AS3661
Datasheet - Package Drawings and Markings
10 Package Drawings and Markings
Figure 38. WL-CSP-25 (2.285x2.285mm) 0.4mm pitch Marking
Pin A1
Indicator
Top View (through)
Bottom View (Ball Side)
5 4 3
2 1
1
2
3
4
5
A
B
C
A
B
C
A
B
C
A
B
C
AS3661
<Code>
D
E
D
E
D
E
D
E
1
2
3
4
5
5
4
3
2
1
Note:
Line 1:
Line 2:
Line 3:
austriamicrosystems logo
AS3661
<Code>
Encoded Datecode (4 characters)
Figure 39. WL-CSP-25 (2.285x2.285mm) 0.4mm pitch Paimensions
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AS3661
Datasheet - Ordering Information
11 Ordering Information
The devices are available as the standard products shown in Table 96.
Table 96. Ordering Information
Ordering Code
Marking
Desciption
Delivery Form
Package
WL-CSP-25
(2.285x2.285mm)
0.4mm pitch
AS3661-BWLT
AS3661
Programmable 9-channel LED Driver
Tape and Reel
Note: All products are RoHS compliant and austriamicrosystems green.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
Technical Support is found at http://www.austriamicrosystems.com/Technical-Support
For further information and requests, please contact us mailto:sales@austriamicrosystem.co
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Datasheet - Ordering Information
Copyrights
Copyright © 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement.
austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice.
Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG f
current information. This product is intended for use in normal commercial applications. Applications requiring
extended temperature range, unusual environmental requirements, or high reliability applications, sucas military,
medical life-support or life-sustaining equipment are specifically not recommended without additionl prcessing by
austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing ow might show
deviations from the standard production flow, such as test flow or tet location.
The information furnished here by austriamicrosystems AG is bieved tbe correct and accurat. However,
austriamicrosystems AG shall not be liable to recipient or any thirpartfor any damags, incuding but not limited to
personal injury, property damage, loss of profits, loss of uinterruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or ng out of the furning, performance or use of the
technical data herein. No obligation or liability to recipient or ny third party shall arisor flow out of
austriamicrosystems AG rendering of technical or other services.
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A-8141 Unterremaetten, Austria
Tel: +43 3136 500 0
Fx: +43 0) 136 525 01
For ales Offices, Distributors and Representatives, please visit:
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