AS3630-ZWLT [AMSCO]
8A Supercap Flash Driver;
| 型号： | AS3630-ZWLT |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | 8A Supercap Flash Driver |
| 文件： | 总72页 (文件大小：763K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AS3630
8A Supercap Flash Driver
The AS3630 is an inductive high efficient 4MHz dual DCDC step
up converter with several sources. It supports the charging of a
Supercap, its voltage balancing and a highly efficient DCDC step
up from the Supercap to the LED and from VIN to the LED to
power the flash LED with up to 8A. The AS3630 supports the
pre-charging of the Supercap (to VIN) to reduce the startup time
for the flash without reducing the lifetime of the Supercap.
General Description
The system concept supports an immediate torch function
without first charging the Supercap.
The AS3630 includes flash timeout, over- undervoltage,
overtemperature and LED short circuit protection.
The AS3630 is controlled by an I²C interface for adjustment of
the currents and timings, set the end of charge voltage and
measure the Supercap and LED parameters through the internal
ADC. A dedicated TXMASK/TORCH input can be used for a torch
button -or- reducing the battery current if a RF PA is operated
at the same time (TX Masking). A hardware enable pin -ON can
be used as a reset input.
The AS3630 is available in a space-saving WL-CSP 5x5 balls
package measuring only 2.5x2.5x0.6mm and operates over the
-30ºC to +85ºC temperature range.
Figure AS3630 – 1:
Key Benefits and Features
Benefits
Features
Dual high efficiency boost converter with soft start
allows small coils
Reduce Supercap size
Instantaneous Torch operation for improved user
experience
Immediate Torch functions with charging of the
Supercap
Tiny external coils
4MHz fixed frequency DCDC
10bit ADC converter for system monitoring with
Protection functions:
Automatic Flash Timeout timer to protect the LED
Overvoltage and undervoltage Protection
LED (NTC) and device Overtemperature Protection
LED short/open circuit protection
System Safety
Improved thermal performance (ground = heat sink)
Flash LED(s) cathode connected to ground:
8A Supercap Flash Driver
AS3630 – 1
Benefits
Features
LED currents (fully adjustable by interface)
• 8A for 33ms and 6A for 120ms (Flash), 2.9mA -
272mA for torch
Fine control of current to fit to applications
• 1mA-8mA indicator current
Full control and hardware ON pin for easier system
integration
I²C Interface with Interrupt output and ON pin
The device is ideal for Flash/Torch for mobile phones, DSC and
Tablets.
Applications
Figure AS3630 – 2:
Typical Operating Circuit
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AS3630 – 2
8A Supercap Flash Driver
Pin Assignment
Figure AS3630 – 3:
Pin Assignments (Top View)
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8A Supercap Flash Driver
AS3630 – 3
Pin Description
Figure AS3630 – 4:
Pin Description
Pin Number
Pin Name
Description
Digital input with pulldown to control strobe time for flash
A1
STROBE
1
function
LED temperature sensor input - connect to NTC and connect its
GND with a separate ground wire to AGND
A2
A3
NTC
Digital input, open drain output - serial data input/output for I²C
interface (needs external pullup resistor)
2
SDA
2
3
A4
A5
B1
B2
SCL
Digital Input - serial clock input for I²C mode
AGND
Analog ground - connect to ground (GND)
Supercap connection
VSUPERCAP
IND_OUT
Indicator LED current source output
Function 1
• “TXMASK” Connect to RF power amplifier enable signal -
reduces currents during flash to avoid a system shutdown
due to parallel operation of the RF PA and the flash driver.
Function 2
B3
TXMASK/TORCH
• “TORCH” Operate torch current level without using the I²C
interface to operate the torch without need to start a
camera processor (if the I²C is connected to the camera
processor.
Digital Input active high - a logic 1 enables of the AS3630; a logic
0 resets the AS3630
B4
B5
C1
C2
C3
C4
ON
VIN
Positive supply voltage input - connect to supply and make a
short connection to input capacitor CVIN and to coil L
DCDC1
Supercap balance pin - balances both single capacitors inside the
Supercap
BAL
DCDC converter 2 switching node - make a short connection to
SW2
PGND
INT
the coil L
and connect all SW2 pins together on top plane
DCDC2
Power ground - connect to ground (GND) and connect all PGND
pins together on top plane
Open drain interrupt output - active low (needs external pullup
resistor)
DCDC converter 1 and 2 output capacitor - make a short
connection to CVOUT1 and connect all VDCDC pins together as
short as possible
C5
VDCDC
AS3630 – 4
8A Supercap Flash Driver
Pin Number
Pin Name
Description
DCDC converter 1 and 2 output capacitor - make a short
connection to CVOUT1 and connect all VDCDC pins together as
short as possible
D1
VDCDC
DCDC converter 2 switching node - make a short connection to
D2
D3
D4
D5
SW2
PGND
the coil L
and connect all SW2 pins together on top plane
DCDC2
Power ground - connect to ground (GND) and connect all PGND
pins together on top plane
DCDC converter 1 switching node - make a short connection to
SW1
the coil L
and connect all SW1 pins together on top plane
DCDC1
Flash LED current source output and connect all LED_OUT pins
together on top plane
LED_OUT
DCDC converter 1 and 2 output capacitor - make a short
connection to CVOUT1 and connect all VDCDC pins together as
short as possible
E1
VDCDC
DCDC converter 2 switching node - make a short connection to
E2
E3
E4
E5
SW2
PGND
the coil L
and connect all SW2 pins together on top plane
DCDC2
Power ground - connect to ground (GND) and connect all PGND
pins together on top plane
DCDC converter 1 switching node - make a short connection to
SW1
the coil L
and connect all SW1 pins together on top plane
DCDC1
Flash LED current source output and connect all LED_OUT pins
together on top plane
LED_OUT
1. Application Information: The pin STROBE is usually connected directly to the camera processor.
2. When SCL and SDA exchanged, the AS3630 uses a different I²C address and the functionality of SCL/SDA is also exchanged - see “I²C Address
Selection” on page 43.
3. Only input: The AS3630 does not perform clock stretching.
8A Supercap Flash Driver
AS3630 – 5
Stresses beyond those listed under “Absolute Maximum
Ratings“ may cause permanent damage to the device. These are
stress ratings only. Functional operation of the device at these
or any other conditions beyond those indicated under
“Operating Conditions” is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Absolute Maximum Ratings
Figure AS3630 – 5:
Absolute Maximum Ratings
Parameter
Min
Max
Units
Comments
VIN, SDA, SCL, ON, STROBE,
TXMASK/TORCH, INT, IND_OUT, NTC
and BAL to GND
-0.3
+7.0
V
SDA, SCL, ON, STROBE,
TXMASK/TORCH, INT, IND_OUT, NTC to
GND
-0.3
-0.3
VIN + 0.3
+11
V
V
V
, SW1, SW2, V
, LED_OUT and
DCDC
DCDC
VSUPERCAP to GND
Diode between
V
V
V
to SW1
to SW2
to LED_OUT
DCDC
DCDC
DCDC
• V
• V
• V
and SW1
and SW2
and LED_OUT
DCDC
DCDC
DCDC
-0.3
V
VSUPERCAP to BAL
• VSUPERCAP and BAL
Connect AGND and PGND to GND
directly below the ball (short
connection required)
AGND, PGND to GND
0.0
0.0
V
+100
Input Pin Current without causing
latchup
-100
mA
Norm: EIA/JESD78
+I
IN
Continuous Power Dissipation (T = +70ºC)
A
1
Continuous power dissipation
2770
37
mW
P
P
T
Continuous power dissipation derating
factor
2
mW/ºC
DERATE
Electrostatic Discharge
ESD HBM
ESD MM
2000
100
V
V
Norm: JEDEC JESD22-A114F
Norm: JEDEC JESD 22-A115-B
AS3630 – 6
8A Supercap Flash Driver
Parameter
Min
Max
Units
Comments
Temperature Ranges and Storage Conditions
+150ºC internally limited only
during flash (max. 20000s)
Junction Temperature
+125
ºC
Storage Temperature Range
Humidity
-55
5
+125
85
ºC
%
Non condensing
Body Temperature during Soldering
+260
ºC
According to IPC/JEDEC J-STD-020
Represents a max. floor life time of
unlimited
Moisture Sensitivity Level (MSL)
MSL 1
1. Depending on actual PCB layout and PCB used.
2. PDERATE derating factor changes the total continuous power dissipation (PT) if the ambient temperature is not 70ºC. Therefore for e.g.
AMB=85ºC calculate PT at 85ºC = PT - PDERATE * (85ºC - 70ºC)
T
8A Supercap Flash Driver
AS3630 – 7
All limits are guaranteed. The parameters with min and max
values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
Electrical Characteristics
V
= +2.5V to +4.8V, T
= -30ºC to +85ºC, unless otherwise
VIN
AMB
specified. Typical values are at V
unless otherwise specified.
= +3.7V, T
= +25ºC,
BAT
AMB
Figure AS3630 – 6:
Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max Units
General Operating Conditions
V
Supply Voltage
2.5
3.7
0.5
4.8
2.0
V
VIN
AS3630 off, V <3.7V, T
ON=0
≤ 50ºC,
≤ 50ºC,
Shutdown
Current
BAT
AMB
I
I
μA
SHUTDOWN
AS3630 off, V <3.7V, T
BAT
AMB
Standby Current
1.0
2
10
μA
μA
ºC
STANDBY
ON=1
Supercap
pre-charging
current
IPRE_
CHARGE_
LOW_POWER
mode_setting = Supercap pre-charge
and charge_current =00b
Operating
Temperature
T
-30
25
85
10
AMB
DCDC1/2 Step Up Converter
DCDC Boost
output Voltage
DCDC1 (L
) and/or DCDC2
DCDC1
V
V
DCDC
(L
) is in operation
DCDC2
(pin V
)
DCDC
DCDC1 (L
) or DCDC2 (L
)
DCDC2
η
Efficiency
90
%
DCDC1
Operating
Frequency
All internal timings are derived from
this oscillator
f
-10%
4.0
+10%
MHz
CLK
DCDC1/2
maximum duty
cycle
max_duty
DCDC
84
%
DCDC Switch
RSW_P1
RSW_N1
RSW_P2
RSW_N2
100
100
70
mΩ
mΩ
mΩ
mΩ
SW1 - V
DCDC
DCDC Switch
SW1 - GND
DCDC Switch
SW2 - V
DCDC
DCDC Switch
SW2 - GND
100
AS3630 – 8
8A Supercap Flash Driver
Symbol
Parameter
Conditions
Min
Typ
Max Units
Supercap Charger / Discharge
0
1
2
3
4
4.469
4.557
4.646
4.724
4.820
4.900
4.995
5.082
5.170
5.258
5.345
5.433
5.526
5.616
5.704
5.793
4.57
4.66
4.75
4.83
4.93
5.01
5.11
5.2
4.671
4.763
4.855
4.936
5.036
5.12
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
5
Programmable in
90mV steps by
6
5.219
5.31
register
end_of_charge_vo
ltage above 5.5V
max. 60000s
End of charge
voltage for
Supercap
7
VSUPERCAP_
1
EOC
8
5.29
5.38
5.47
5.56
5.65
5.74
5.83
5.92
5.402
5.494
5.585
5.677
5.774
5.868
5.96
during lifetime of
AS3630
9
Ah
Bh
Ch
Dh
Eh
Fh
6.053
Pre-charging and
transition (to
charge) of
charge_current
=00b, low
quiescent
100
200
300
Supercap - see
Supercap
current mode
Pre-charging
current of
ISUPERCAP_
01b
10b
380
570
500
750
650
975
Charging/Discharg
e/Pre-charge to
VIN ; final charging
to VSUPERCAP_EOC is
controlled by
coil1_peak
mA
CHARGE
2
Supercap
11b
760
1000
10
1300
During torch, charge or PWM
operation keep VSUPERCAP charged
if keep_sc_charged =1
KeepingSupercap
charged current
IKEEP_
CHARGE
mA
Discharge
resistance for
VSUPERCAP
mode_setting = 001b / shutdown
and discharge Supercap
RDIS_
CHARGE
250*2
Ω
8A Supercap Flash Driver
AS3630 – 9
Symbol
Parameter
Conditions
Min
Typ
Max Units
LED Current Sources
Limited lifetime max. 20000s,
mode_setting = flash operation;
current specified for each of the two
flash LEDs
(2x)
3000
10
10
mode_setting = torch operation
460
mA
LED_OUT Current
set by led_current
ILED_OUT
303.9
*
duty
cycle
mode_setting = PWM operation
duty cycle defined by led_out_pwm
10
Accuracy, ΔI
-10
+10
%
LED_OUT ripple
current
ILED_OUT_
RIPPLE
I
=2500mA, BW=20MHz
200
mApp
LED
Minimum Voltage
between
led_current_ra
nge =00b or
01b
0.4
0.5
VSUPERCAP and
LED_OUT to
generate the
programmed
current
Flash current
source voltage
compliance
VFLASH_
COMP
V
10b
(led_current)
Range
1.0
-20
8.0
mA
%
Set by ind_current
in 1mA steps
IIND_OUT
Indicator Current
Accuracy, ΔI
+20
2.6
x2
4.4
x2
LED_OUT-
led_current_range = 00b…10b
V
V
forward voltage
measured on pin
LED_OUT
VLED_OUT
2.6
x2
4.325
x2
led_current_range = 11b (4A)
ADC
Resolution
10
bits
‘000h
’
ADC Code
‘3FFh’
5.866
BAL, VIN, IND_OUT, PGND,
TXMASK/TORCH, STROBE, INT and ON
0.0
V
VSUPERCAP
NTC
0.0
0.0
0.0
6.666
2.2
V
V
V
ADC input range;
channel selected
by ADC_channel
Range
V
11
DCDC
LED_OUT
12.1
Tjunc (AS3630 junction temperature, in ºC) =
round (((4 * ADC_D9-D2 + ADC_D1-D0) - 324) * -1.05042)
ºC
AS3630 – 10
8A Supercap Flash Driver
Symbol
Parameter
Conditions
Min
Typ
Max Units
Number of conversion per
measurement (averaged);
ADC internal
averaging filter
Averaging
measurements can be started
immediately, at begin of flash and
end of flash - see ADC_convert
4
Protection and Fault Detection Functions
V
DCDC
DCDC Converter Overvoltage
Protection
V
9.3
10.0
V
overvoltage
protection
VOUTMAX
Current Limit for
Range
500
3500
mA
Set by coil1_peak
and
coil L
(Pin
DCDC1
SW1) measured at
75% PWM duty
ILDCDC1
coil1_txmask_curr
_red during
TXMask
Accuracy, ΔI
Range
-10
1000
-10
+10
6000
+10
%
mA
%
3
cycle
Current Limit for
coil L
(Pin
DCDC2
SW1) measured at
75% PWM duty
ILDCDC2
Set by coil2_peak
Accuracy, ΔI
3
cycle
Voltage measured on pin LED_OUT
monitored once the LED_OUT current
is at or above a minimum current -
“Short/Open LED Protection -
fault_led” on page 35
Flash LED short
circuit detection
voltage
V
1.45
V
LEDSHORT
Overtemperature
Protection
T
144
5
ºC
OVTEMP
Junction temperature
T
Overtemperature
Hysteresis
OVTEMP
HYST
ºC
Range
Set by
4
760
ms
t
Flash Timeout
Timer
FLASHTIMEO
UT
-10%
-2ms
+10%
+2ms
flash_timeout
Accuracy, Δt
Falling V
2.3
2.4
2.5
V
V
VIN
Undervoltage
Lockout
V
UVLO
V
V
V
UVLO
+0.05
UVLO
+0.1
UVLO
+0.15
Rising V
VIN
8A Supercap Flash Driver
AS3630 – 11
Symbol
Parameter
Conditions
Min
Typ
Max Units
Protection and Fault Detection Functions - NTC
0
off
40
1
2
34.4
45.6
88
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
72
80
3
110
147
184
220
257
294
331
368
404
441
478
515
552
120
160
200
240
280
320
360
400
440
480
520
560
600
130
173
216
260
303
346
389
432
476
519
562
605
648
4
5
6
Adjustable by
NTC_current in
40μA steps,
7
NTC Current
Source
INTC
8
V(NTC) ≤ 1.7V
9
Ah
Bh
Ch
Dh
Eh
Fh
If ntc_on=1 and the voltage on NTC
drops below VNTC_TH, any flash/torch
or PWM operation of LED_OUT is
stopped
Threshold for
overtemperature
VNTC_TH
1.0
V
Digital Interface
High Level Input
Voltage
V
V
1.28
0.0
0
V
V
IH
VIN
Pins SDA, SCL, ON, STROBE and
TXMASK/TORCH
Low Level Input
Voltage
V
0.5
0.2
IL
Low Level Output
voltage
V
Pin INT and SDAat 2mA
V
OL
Leakage current
I
Pins SDA, SCL, ON
Pins
TXMASK/TORCH,
STROBE
-1.0
+1.0
μA
LEAK
V
or GND
VIN
Pulldown current
to GND
RPULLDOWN
1.8V on pad
35
kΩ
torch debounce
time
tDEBTORCH
TXMASK/TORCH input in torch mode
7.5
ms
AS3630 – 12
8A Supercap Flash Driver
Symbol
Parameter
Conditions
Min
Typ
Max Units
TXMASK/TORCH input in TXMask
mode - see “TXMASK” on page 28
tDEBTXMASK
debounce timer
2.1
μs
I²C Mode Timings (page 14 )
SCL Clock
Frequency
f
0
400
kHz
μs
SCLK
Bus Free Time
Between a STOP
and START
t
1.3
BUF
Condition
Hold Time
(Repeated) START
t
0.6
μs
HD:STA
4
Condition
LOW Period of
SCL Clock
t
1.3
0.6
μs
μs
LOW
HIGH Period of
SCL Clock
t
HIGH
Setup Time for a
Repeated START
Condition
t
0.6
μs
SU:STA
5
t
0
0.9
μs
μs
Data Hold Time
HD:DAT
6
t
100
Data Setup Time
SU:DAT
Rise Time of Both
SDA and SCL
Signals
20 +
t
300
300
ns
ns
R
0.1C
B
Fall Time of Both
SDA and SCL
Signals
20 +
t
F
0.1C
B
Setup Time for
STOP Condition
t
0.6
μs
pF
pF
SU:STO
C — total capacitance of one bus
line in pF
Capacitive Load
for Each Bus Line
B
C
400
10
B
I/O Capacitance
(SDA, SCL)
C
I/O
1. In pre-charge the Supercap is always charged close to VVIN; therefore VSUPERCAP_EOC ≥ VVIN is possible
2. In order to reduce the total charging time of the Supercap, it is recommended to keep the Supercap pre-charged at VIN (can be enabled/dis-
able by mode_setting)
3. Due to slope compensation of the current limit, the current limit changes with duty cycle
4. After this period, the first clock pulse is generated.
5. A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIHMIN of the SCL signal) to bridge the unde-
fined region of the falling edge of SCL.
6. A fast-mode device can be used in a standard-mode system, but the requirement tSU:DAT = to 250ns must then be met. This is automatically
the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it
must output the next data bit to the SDA line tR max + tSU:DAT = 1000 + 250 = 1250ns before the SCL line is released.
8A Supercap Flash Driver
AS3630 – 13
Timing Diagrams
Figure AS3630 – 7:
2
I C Mode Timing Diagram
SDA
t
BUF
t
LOW
t
t
t
HD:STA
R
F
SCLK
t
HD:STA
t
SU:STO
t
SU:STA
t
t
t
SU:DAT
HD:DAT
HIGH
REPEATED
STO START
All measurements are performed at V =3.7V and T
=25°C.
Typical Operating Characteristics
Figure AS3630 – 8:
VIN
AMB
LED = LXCL-LW07.
Efficiency vs. Supply Voltage V for DCDC1
IN
Efficiency vs. Supply Voltage: Shows efficiency (P /P ) of internal DCDC1 (V to V ) vs. different supply
DCDC
OUT IN
IN
AS3630 – 14
8A Supercap Flash Driver
voltages.
Figure AS3630 – 9:
Efficiency vs. V
for DCDC2
SUPERCAP
Efficiency vs. Supply Voltage: Shows efficiency (P /P ) of internal DCDC2 (V
to V ) vs. voltage on
DCDC
OUT IN
SUPERCAP
V
while discharging from 6V down to 3V.
SUPERCAP
8A Supercap Flash Driver
AS3630 – 15
Figure AS3630 – 10:
Supercap Charging Cycle
VVSUPERCAP (1V/div)
VVOUT_DCDC (2V/div)
IVIN (500mA/div)
time (500ms/div)
Supercap charging cycle: Shows all phases for charging of the Supercap starting from Pre-charge to transitions
to charge until end of charge.
Figure AS3630 – 11:
Complete Flash Cycle
VVSUPERCAP (1V/div)
ILED_OUT (500mA/div)
IVVIN (500mA/div)
ISUPERCAP (2A/div)
time (2ms/div)
Complete flash cycle: Shows a complete LED flash cycle, flash time=16ms, I
=3A, automatic re-charge
LED_OUT
enabled at end of flash cycle.
AS3630 – 16
8A Supercap Flash Driver
Figure AS3630 – 12:
Startup of Flash Cycle
VVSUPERCAP (1V/div)
ILED_OUT (500mA/div)
IVVIN (500mA/div)
ISUPERCAP (2A/div)
time (40μs/div)
Startup flash cycle: Shows detailed (zoomed) of startup of a flash cycle, I
=3A.
LED_OUT
Figure AS3630 – 13:
Shutdown of Flash Cycle
ILED_OUT (500mA/div)
VLED_OUT (2V/div)
IVVIN (1A/div)
ISUPERCAP (1A/div)
time (50μs/div)
Shutdown flash cycle: Shows detailed (zoomed) of rampdown of a flash cycle, I
=2.5A.
LED_OUT
8A Supercap Flash Driver
AS3630 – 17
Figure AS3630 – 14:
Torch Cycle
VVDCDC_OUT (1V/div)
ILED_OUT (20mA/div)
IVVIN (500mA/div)
VVSUPERCAP (1V/div)
time (80μs/div)
Torch cycle: Shows a torch operation. To operate the torch no charging of the Supercap is required (see voltage
on VSUPERCAP), I =100mA.
LED_OUT
Figure AS3630 – 15:
ILED_OUT Ripple Waveform
ILED_OUT (30mA/div, AC coupled)
time (100ns/div)
ILED_OUT ripple: Current ripple measured on ILED during flash with I
=2A.
LED_OUT
AS3630 – 18
8A Supercap Flash Driver
Figure AS3630 – 16:
Open LED Detection Waveform
VVDCDC_OUT (2V/div)
VLED_OUT (2V/div)
ILED_OUT (100mA/div)
time (400μs/div)
Open LED detection: Detailed measurement for detection of an open LED (LED disconnected) in torch mode.
Figure AS3630 – 17:
Short LED Detection Waveform
VVDCDC_OUT (1V/div)
VLED_OUT (1V/div)
ILED_OUT (50mA/div)
time (40μs/div)
Short LED detection: Detailed measurement for detection of a shorted LED (short during operation).
8A Supercap Flash Driver
AS3630 – 19
Figure AS3630 – 18:
Switching Waveform
VSW1 (3V/div)
VSW1 (2V/div)
ILDCDC1 (200mA/div ac
coupled)
time (320ns/div)
Switching waveform: Detailed measurement of the DCDC converters in operation during flash.
AS3630 – 20
8A Supercap Flash Driver
Detailed Descriptions
The AS3630 is a highly efficient dual DCDC Supercap charger
charging and balancing the Supercap and operating a LED flash
at up to 8A current.
The principle of operation of a AS3630 is as follows:
1. Charge the Supercap on VSUPERCAP to e.g. 5.5V - see
Supercap Charging/Discharge/Pre-charge to VIN
2. Torch (or PWM) operation of the LED does not depend
on a charge Supercap - see “Torch/PWM Operation” on
page 25.
3. Use DCDC1 to step up from VIN to V
to source one
DCDC
part of the LED_OUT current; in parallel use DCDC2 to
step up from -VSUPERCAP to V to source the
DCDC
remaining part of the flash current - see Flash Operation.
Using this approach a very high current flash operation can be
performed using considerable low current from the battery
(usually batteries have a defined strict current limit, so the full
flash current cannot be supplied directly from the battery only).
Supercap Charging/Discharge/Pre-charge to VIN
The charging of the Supercap is performed in following steps:
• Pre-Charge - (see Figure below): Charge the Supercap
close to VIN - initiated by setting mode_setting = Supercap
1 2
pre-charge , :
The switch between SW1 and V
is closed and I
CHARGE
DCDC
(set by charge_current) is used to control the charging
current. Use charge_current=00b for a special low power
mode only consuming I
.
PRE_CHARGE_LOW_POWER
1. This mode is usually used during standby of the system - the Supercap is kept at VIN; this will reduce the charging time, when the
camera is operated and the Supercap has to be charged to its final end of charge voltage (e.g. 5.5V)
2. In pre-charge the Supercap is always charged close to VVIN; therefore VSUPERCAP_EOC ≥ VVIN
8A Supercap Flash Driver
AS3630 – 21
Figure AS3630 – 19:
Supercap Pre-charging
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3
• Transition between pre-charge -> charge: Once the
voltage on VSUPERCAP is close to V and mode_setting
VIN
= “Supercap charge”, the DCDC1 converter is started and
the current source I between V and
CHARGE
DCDC
VSUPERCAP is used to finally charge VSUPERCAP to V
VIN
3. To avoid a current peak at VIN if the VSUPERCAP is connected to VIN, but its voltage is still below VIN
AS3630 – 22
8A Supercap Flash Driver
Figure AS3630 – 20:
Supercap Charging
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• Charging - (see Figure above): Once the voltage on
VSUPERCAP ≥ VIN and mode_setting = “Supercap charge”,
the main charging can start: The DCCD1 converter is
operated and the switch between V
and SW2 is closed.
DCDC
The charging current in this phase is defined by the L
peak current limit (programmed by coil1_peak).
Once the voltage on VSUPERCAP reaches
DCDC1
4
end_of_charge_voltage , the peak current through L
DCDC1
is reduced to 500mA. Charging is finished when the
voltage on VSUPERCAP again reaches
end_of_charge_voltage. Then the flash status_eoc is set and
if enabled by status_eoc_mask, INT is pulled low.
If keep_sc_charged=1, AS3630 will continuously check the
voltage on VSUPERCAP if it drops below
end_of_charge_voltage and automatically recharge the
Supercap with 5mA.
5
• Keep charge: Even in torch or PWM operation of the LED
connected to LED_OUT the charge on VSUPERCAP can be
maintained by setting keep_sc_charged=1. Then the
current source I
will be used to charger
KEEP_CHARGE
VSUPERCAP from V
(without exceeding
DCDC
end_of_charge_voltage).
4. In pre-charge the Supercap is always charged close to VVIN; therefore VSUPERCAP_EOC ≥ VVIN
5. In these modes DCDC2 is not used as LED_OUT can be driven directly with DCDC1 from VIN.
8A Supercap Flash Driver
AS3630 – 23
• Shutdown: Setting mode_setting=”shutdown or external
torch mode (leave Supercap charged)” will keep the
Supercap charged and disables the balancing circuit.It can
be forced on if bal_force_on is set. If the voltage voltage
on V
is above 5.35V, the Supercap will be discharged
DCDC
until V
is below 5.3V before shutdown mode is
DCDC
entered.
• Shutdown and Discharge: Setting
mode_setting=”shutdown and discharge Supercap” will
6
slowly discharge the Supercap through RDIS_CHARGE .
• Pre-Charge after Charge or Flash: Setting
mode_setting=”pre charge Supercap (to VIN)” will
discharge the Supercap to approximately V -0.3V by
VIN
using RDIS_CHARGE. Afterwards the Supercap is charged
to V
as shown in Figure 19.
VIN
Note: If the Supercap is charged above 5.5V it will be discharged
to 5.5V even if the mode is set to “shutdown or external torch
mode (leave Supercap charged)” to protect the Supercap.
If during pre-charge, transition or charging operation, the
junction temperature exceed T
, the operation is
OVTEMP
temporarily stopped and automatically resumes, when the
junction temperature has dropped below T -T
.
OVTEMP OVTEMPHYST
The Supercap balancing circuit keeps both parts of the
Supercap at the same voltage level - see Balancing Circuit - Pin
BAL.
6. Implemented by a resistor between VSUPERCAP and BAL and another resistor between BAL and GND.
AS3630 – 24
8A Supercap Flash Driver
Torch/PWM Operation
Due to its concept, a torch or PWM operation can be performed
without even charging the Supercap (this allows instantaneous
video light or torch light):
Figure AS3630 – 21:
Immediate Torch (=Video Light) or PWM Operation
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7
After setting mode_setting = “Torch” or “PWM Operation” the
step-up DCDC1 converter is used to generate -V sufficiently
DCDC
high enough to drive the I
current (controlled by
LED_OUT
led_current). If keep_sc_charged (page 51)=1, VSUPERCAP is
charged by the current source I (without exceeding
KEEP_CHARGE
end_of_charge_voltage) to maintain the charge on the Supercap
during this operating mode.
7. In PWM operation the current source ILED_OUT is PWM modulated with a duty cycle set by led_out_pwm.
8A Supercap Flash Driver
AS3630 – 25
Flash Operation
Additionally the step up converter DCDC1 (from VIN using
L
), the step up converter DCDC2 (from Supercap using
DCDC1
L
) is used in parallel operating at high efficiency for the
DCDC2
flash operation. This allows to reduce the current for each of the
DCDC’s and therefore the size of the Supercap and/or current
required from battery:
Figure AS3630 – 22:
Flash DCDC1 and DCDC2 Parallel Operation to Reduce Current and Size of Supercap
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ꢗꢆꢐꢇꢈꢉ
ꢗꢐꢀꢂ
ꢊꢎꢒꢅꢇꢓ
ꢊꢋꢐ
ꢔꢕꢀꢖꢗꢘꢐ
ꢍꢋꢐꢁꢖꢐꢄ
ꢘꢇꢈꢓꢙꢂꢔꢕꢀꢓ
ꢊꢋꢀꢖꢗꢘꢐ
ꢋꢐꢁ
ꢀꢊꢋꢀ
ꢏꢅꢋꢀ
ꢀꢅꢋꢀ
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ꢔꢕꢀ
ꢁꢋꢐꢁ
ꢀꢘꢔꢏꢑꢄꢖ
The flash operation is enabled by mode_setting = “Flash” and
the timeout timer (register flash_timeout) defines the maximum
flash duration.
Note: If the voltage on VSUPERCAP drops below 2.55V, DCDC2
is automatically stopped (and the flash current is supplied by
DCDC1 only).
Once the flash is finished, the AS3630 will automatically select
the operating mode according to register mode_after_flash (see
page 51) shown in Figure 26:
AS3630 – 26
8A Supercap Flash Driver
Figure AS3630 – 23:
Automatically Selected Operating Mode After Flash
mode_after_flash
mode_setting
updated to
Mode selected after flash has been finished
(see page 51)
00
000b
Shutdown of AS3630, but leave Supercap at the voltage
at the end of the flash
01
10
001b
010b
Shutdown AS3630 and discharge Supercap
Discharge the Supercap to approximately VVIN-0.3V by
using RDIS_CHARGE. Afterwards the Supercap is charged to
VVIN as shown in Figure 19 and kept at this voltage
11
011b
Supercap is automatically recharged to
end_of_charge_voltage
DCDC1 / DCDC2 Operating Principle During Flash
In order to supply the required LED output current during flash
operation, DCDC1 (from VIN) and DCDC2 (from Supercap) are
used in parallel as shown in Figure 22.
Three different operating modes are used (automatically
selected by the AS3630):
1. DCCD1 alone can deliver the full flash current.
I
<coil1_peak, I
=0A
DCDC1
DCDC2
DCDC1 is regulated to deliver the flash LED current
alone; no current is used from DCDC2 or the Supercap.
2. DCDC1 and DCDC2 together deliver the flash current.
I
hits coil1_peak, I
<coil2_peak
DCDC1
DCDC2
DCDC1 is operating in peak current limit (controlled by
coil1_peak) and DCDC2 is controlled to deliver the
remaining current for the LED. DCDC2 peak current is
below the setting coil2_peak.
3. DCDC1 and DCDC2 together cannot deliver the full flash
current.
I
hits coil1_peak, I
hits coil2_peak
DCDC1
DCDC2
In this operating mode both peak current settings
together (coil1_peak and coil2_peak) are not able to
deliver the programmed led_current. Therefore both
DCDCs are operating in coil current limit and the LED
current is the resulting sum of these two currents. If the
register bit curr_limit_curr_red is set, led_current is
8
ramped down until DCDC2 leaves peak current limit
and operation continuous at mode 2. (DCDC1 and
DCDC2 together deliver the flash current) and
led_current_min is set to the reduced LED current.
4. If the voltage on VSUPERCAP drops below 2.4V, DCDC2
is disabled and the flash current drops to the current
supplied by DCDC1 only.
8. fault_current_reduced is set to indicate this condition.
8A Supercap Flash Driver
AS3630 – 27
Note: If DCDC1 shall not be used during flash (the whole current
has to be delivered by DCDC2 using the Supercap only, no
current from VIN) set the registers as follows:
txmask_torch_mode = 01b (TXMASK/TORCH is used as TXMask
input),
pull TXMASK/TORCH to ‘1’,
coil1_peak = 000b.
The AS3630 will then always operate in TXMask mode and
switch off DCDC1 (as coil1_peak = 000b).
Battery and Flash LED Current Reductions in Flash Mode
Current Reduction by VIN Measurements In Flash Mode
Due to the load of the flash driver and the ESR of the battery
(especially critical at low temperatures), the voltage on the
battery drops. If the voltage drops below the system reset
threshold, the system would reset. To prevent this condition the
AS3630 monitors the battery voltage and keeps it above
vin_low_v as follows:
During flash, if the voltage on VIN drops below the threshold
defined by vin_low_v, coil1_peak current is reduced thus
reducing the current from the battery and preventing a system
shutdown. Due to the unique regulation scheme (see DCDC1 /
DCDC2 Operating Principle During Flash) more current is
automatically used from the Supercap and therefore the flash
current is kept constant.
This function can be disabled by setting vin_low_v = 000b.
DCDC1 and DCDC2 in Current Limit
See DCDC1 / DCDC2 Operating Principle During Flash operating
mode 3.
TXMASK
The coil L
current limit is usually defined by coil1_peak. If
DCDC1
this current is too high to allow parallel operation of another
high power load (e.g. the RF power amplifier) without
overloading of the battery, the TXMask function can be used.
Set txmask_torch_mode = 01b (TXMASK/TORCH is used as
TXMask input) and connect the enable line of the other high
power load to the AS3630 pin TXMASK/TORCH.
In the event of TXMASK/TORCH=1 during flash, the coil1_peak
current is instantaneously reduced by coil1_txmask_curr_red
steps (coding as for coil1_peak). If coil1_peak minus
coil1_txmask_curr_red steps would be negative DCDC1 is
switched off during TXMask.
Once TXMASK/TORCH=0, the coil peak current is ramped to the
previous programmed value of coil1_peak.
Continuous LED Current Ramp Down During Flash
If the register led_current_rampdown is set, the LED current
during flash is continuously ramped down. This has the benefit
of using the Supercap energy most efficiently.
AS3630 – 28
8A Supercap Flash Driver
Balancing Circuit - Pin BAL
Figure AS3630 – 24:
Balancing Circuit
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The internal balancing circuit (Figure 24) keeps the voltage
between VSUPERCAP-BAL to BAL-GND equal in order to avoid
overvoltage on one of the capacitors inside the Supercap. It is
powered from VSUPERCAP, therefore it can operate even if there
is no voltage on VIN.
The Supercap balancing circuit is active in pre-charge,
transition, charge, keep charge and discharge. It can be forced
on in flash and shutdown if bal_force_on is set.
8A Supercap Flash Driver
AS3630 – 29
Operating Mode and LED Currents
Currents and operating modes are selected according to the
following figure:
Figure AS3630 – 25:
Operating Mode and Current Settings
AS3630 Configuration
Operating Mode and Currents
Condition
Mode
No supply on VIN (0V)
Shutdown
All registers are
reset to their
Discharging
0
X
X
X
VIN supplied
default values
txmask_torch_m
ode not 10
X
0
1
X
X
X
X
X
Keep voltage as is
if mode_setting
=000b,
discharging if
mode_setting=00
1b
Standby
0mA
txmask_torch_m
ode =10
000b,
001b
1
txmask_torch_m
ode =10
External torch
mode
led_current
limited to 460mA
Pre-charge
Supercap to VIN
010b
011b
Pre-charge
0mA
Charge Supercap
to
end_of_charge_v
oltage
X
X
Charge
0mA
AS3630 – 30
8A Supercap Flash Driver
AS3630 Configuration
Operating Mode and Currents
Condition
Mode
1
led_current
X
X
X
X
100b
101b
Torch light mode
PWM operation:
limited to 460mA
If
keep_sc_charged
=0 keep voltage
on Supercap as is;
3
led_current
limited to
303.9mA PWM
modulated by
led_out_pwm
(1/16...4/16 @
31.25kHz,
Use for indicator
with the main flash
LED or low current
if
keep_sc_charged
=1 charge
2
Supercap to
end_of_charge_v
oltage with
IKEEP_CHARGE -
Figure 21 on
page 25
PWM operation
1/32, 3/32 @
15.625kHz)
0
1
X
0mA
Torch operation
sync to STROBE -
see Figure 32 on
page 35
X
110b
1
led_current
limited to 931mA
strobe_on = 0
Flash mode;
Supercap is
discharged using
DCDC2 to
0-
>
1
strobe_on = 1
and
strobe_type = 0
flash duration
defined by
flash_timeout
LED_OUT -
Figure 22 on
page 26
led_current for
flash duration
Flash mode;
111b
strobe_on = 1
and
strobe_type = 1
flash duration
defined by STROBE
input; timeout
defined by
mode selected
after flash: see
Figure 23 on
page 27
1
flash_timeout
1. If led_current_range=10 will use led_current_range=00.
2. The low current mode is a general purpose PWM mode to drive less current through the LED in average, but keep the actual pulsed current
in a range where the light output from the LED is still specified.
3. Will use led_current_range=00.
4. If txmask_torch_mode=01b then the DCDC1 peak coil current is changed depending on input TXMASK/TORCH - see section “TXMASK” on
page 28
8A Supercap Flash Driver
AS3630 – 31
Current Ranges
Depending on operating mode (mode_setting(see page 51)) the
9
current settings according to Figure 26 are possible :
Figure AS3630 – 26:
LED Current Selections
External Torch
led_current_range Mode or Torch
Mode
Flash
Torch operation
PWM Operation
Operation sync to STROBE
00
Ok, but limited to
460mA
Ok, but limited to
303.9mA
Ok, but limited to
931mA
Ok
(10-2500mA range)
01
Will use 00 range
(10-303.9mA)
Ok
Ok
Ok
Ok
(10-250mA range)
10
Will use 00 range
(10mA - 460mA)
Will use 00 range
(10-303.9mA)
Will use 00 range
(10mA - 931mA)
(2500-3000mA range)
SOFTSTART / Soft Ramp Down
During startup and ramp down the LED current is smoothly
ramped up and ramped down. Additionally the DCDC converter
on VIN has a startup mechanism to minimize or eliminate
battery input current overshoots.
Indicator Blinking Function
Setting ind_on=1 enabled the indicator current source on pin
IND_OUT. If ind_blink_delay=00 or ind_blink_on_time= 00, the
current source is constantly enabled with a current defined by
ind_current. All other conditions enable the indicator blinking
feature as shown in Figure 27 controlled by ind_blink_on_time,
ind_rampup_smooth, ind_rampdown_smooth, ind_blink_delay
and ind_current. Smooth current rampup and rampdown is
done using PWM modulation.
9. The LED current is limited by hardware to protect the LEDs under any condition.
AS3630 – 32
8A Supercap Flash Driver
Figure AS3630 – 27:
Indicator Blinking Function Waveform
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ꢒꢂꢓꢎꢘꢇꢗꢙꢓꢃ!ꢂꢎꢅꢗꢃꢃꢄꢛ
Flash Strobe and Torch Sync to STROBE Timings
The timings are defined as follows:
1. Flash duration defined by register flash_timeout and
flash is started immediately when this mode is selected
by the I²C command (see Figure 28):
set strobe_on = 0, start the flash by setting mode_setting
= 111b
2. Flash duration defined by register flash_timeout and
flash started with a rising edge on pin STROBE (see
Figure 29):
set strobe_on = 1, strobe_type = 0 and setting
mode_setting = 111b
3. Flash start and timing defined by the pin STROBE; the
flash duration is limited by the timeout timer defined by
flash_timeout (see Figure 30 and Figure 31):
set strobe_on = 1, strobe_type = 1 and setting
mode_setting = 111b
4. Torch operation synchronized to pin STROBE; the
current is limited according to Figure 26:
setting mode_setting = 110b
Figure AS3630 – 28:
AS3630 Flash Duration Defined by flash_timeout without Using STROBE Input
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8A Supercap Flash Driver
AS3630 – 33
Figure AS3630 – 29:
AS3630 Flash Duration Defined by flash_timeout, Starting Flash with STROBE Rising Edge
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Figure AS3630 – 30:
AS3630 Flash Duration and Start Defined by STROBE, Limited by flash_timeout; Timer Not Expired
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Figure AS3630 – 31:
AS3630 Flash Duration and Start Defined by STROBE, Limited by flash_timeout; Timer Expired
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AS3630 – 34
8A Supercap Flash Driver
Figure AS3630 – 32:
AS3630 Torch Operation with Duration Synchronized to STROBE Input
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Protection, Status, NTC and Fault Detection
Supercap End of Charge Detection - status_eoc
Charging of the Supercap is performed as described in
Figure 20. Once charging is finished the register status_eoc is
set.
ADC End of Conversion - status_adc_eoc
Once the ADC conversion is finished, status_eoc is set - see
“ADC” on page 38.
Short/Open LED Protection - fault_led
After the startup of the LED_OUT current source, the voltage
on LED_OUT is continuously monitored and compared against
V
after the LED current has reached a minimum current
LEDSHORT
depending on led_current_range (see page 47) - see the figure
below:
Figure AS3630 – 33:
Short LED Detection Minimum Current
led_current_range
Short LED Detected Above
00
>29.4mA
(10-2500mA range)
01
>20.58mA
>23.53mA
Disabled
(10-250mA range)
10
(3000mA range)
11
(4000mA range)
If the voltage on LED_OUT stays below V
is detected.
, a shorted LED
LEDSHORT
8A Supercap Flash Driver
AS3630 – 35
If the voltage on V
reaches V
and the voltage across
VOUTMAX
DCDC
the current source between V
and LED_OUT is below
DCDC
V
an open LED is detected.
FLASH_COMP
If an open or shorted LED is detected, bit fault_led is set. The
DCDCs and current sinks are disabled and the Supercap is
discharged by setting mode_setting=001b. In external torch
mode, the register txmask_torch_mode is reset.
Note: Short/open LED detection is disabled in PWM operating
mode (mode_setting=101b). The voltage on V
will
DCDC
nevertheless never exceed V
.
VOUTMAX
AS3630 DIE Overtemperature Detected - fault_overtemp
The junction temperature of the AS3630 is continuously
monitored. If the temperature exceeds T
, the DCDCs are
OVTEMP
stopped, the current sources are disabled (instantaneous) and
the bit fault_overtemp is set (but the operating mode
mode_setting is not changed). The driver is automatically
re-enabled once the junction temperature drops below
T
-T
.
OVTEMP OVTEMPHYST
Note: If an overtemperature is detected in Supercap pre-charge,
transition or charge mode, charging is temporarily disabled
until the temperature drops, but the register bit fault_overtemp
is not set.
Timeout Fault - fault_timeout
If the flash is started a timeout timer is started in parallel. If the
flash duration defined by the STROBE input (strobe_on=1 and
strobe_type=1, see Figure 31) exceeds tFLASHTIMEOUT
(adjustable by register flash_timeout), the DCDCs are stopped
and the flash current source (on pin LED_OUT) is disabled
(ramping down) and fault_timeout is set.
If the flash duration is defined by the timeout timer itself
(strobe_on = 0, see Figure 28), the register fault_timeout is not
set after the flash has been finished.
AS3630 will automatically select the operating mode according
to register mode_after_flash shown in Figure 26.
Supercap Short Detected - fault_sc_short
In all operating modes except shutdown (mode_setting not
000b or 001b) once VSUPERCAP is above 2.4V both internal
capacitors of the Supercap (VSUPERCAP-BAL and BAL-GND) are
10
monitored if they are shorted. If any of them is shorted
,
charging is stopped and the Supercap is discharged by setting
mode_setting=001b andfault_sc_short is set.
10. VSUPERCAP-BAL is compared with typ. 950mV, BAL-GND is compared with typ. 700mV.
AS3630 – 36
8A Supercap Flash Driver
NTC - Flash LED Overtemperature Protection - fault_ntc
Figure AS3630 – 34:
NTC Internal circuit
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The NTC input can be used to monitor the flash LED temperature
if ntc_on=1. A internal current source controlled by NTC_current
sources a current on pin NTC - see Figure 34. If the voltage on
pin NTC drops below VNTC_TH, fault_ntc is set, the DCDCs are
stopped and the flash current source (on pin LED_OUT) is
disabled (instantaneous) by setting mode_setting depending
on register mode_after_flash. If mode_after_flash=001b then
mode_setting=001b (shutdown and discharge Supercap). All
other settings of mode_after_flash result in mode_setting=000b
(shutdown).
As the external NTC cannot measure the LED temperature in
real time during a short high current flash pulse (the duration
from heating up of the LED until the NTC recognizes a too hot
LED is usually too long), it is advisable to measure the LED
temperature before the flash pulse (with the ADC and
NTC_current) and judge how much current can be driven
through the LED (to be estimated depending on LED heat sink
and is usually specified by the LED manufacturer).
LED Current Reduction Triggered - fault_current_reduced
If during flash the LED current has been reduced (for conditions
when this can occur see DCDC1 / DCDC2 Operating Principle
During Flash operating mode 3.), the register bit
fault_current_reduced is set for indication and lled_current_min
is set to the reduced LED current.
The operating mode is not changed and the DCDCs and current
source continue operation.
8A Supercap Flash Driver
AS3630 – 37
Supply Undervoltage Protection
If the voltage on the pin VIN (=battery voltage) is or falls below
V
, the AS3630 is kept in shutdown state and all registers are
UVLO
set to their default state.
Interrupt Output
INT is an open drain, active low output. The internal circuit to
control this pin is shown in Figure 35.
Figure AS3630 – 35:
Interrupts Processing
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ꢌꢈꢏꢊꢋꢀꢌ
ꢌꢀꢇ
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ꢊꢀꢌ
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"ꢑꢏ#ꢇꢃ ꢃ!ꢇꢑꢇꢏꢌ
ꢌꢇꢑꢇꢏꢌꢒꢀꢈꢋꢒꢓꢑꢌꢔ
Once an interrupt event occurs (e.g. end of charge of Supercap;
detailed description of interrupt events in “AS3630 Torch
Operation with Duration Synchronized to STROBE Input ” on
page 35, the interrupt flip flop is set (register status_eoc=1). If
the interrupt mask is high (register status_eoc_mask=1), the
output INT is pulled to low signalizing an interrupt condition.
All 8 interrupt flip flops are automatically cleared upon readout
of register Fault / Status.
ADC
The ADC is programmed by setting the ADC channel in register
ADC_channel (page 52) and the ADC conversion is performed
after setting ADC_convert (page 52).
The actual timing when the ADC conversion is started / finished
is programmed with ADC_convert as shown in Figure 36:
AS3630 – 38
8A Supercap Flash Driver
Figure AS3630 – 36:
ADC Timings
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ꢚꢛꢁꢆꢀꢁꢌꢏꢐꢑꢌꢔꢜꢜꢄꢝꢔꢆꢁꢄꢉ !ꢌ
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ꢚꢏꢁꢌꢄꢃꢝꢌꢒꢅꢌꢅꢉꢆꢊꢋ!ꢌ
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ꢂꢃꢁꢄꢀꢅꢆꢇꢄ
ꢏꢐꢑꢌꢑꢒꢃꢓꢄꢀꢊꢔꢒꢃ
ꢐꢆꢁꢆꢌꢆꢓꢆꢔꢉꢆꢙꢉꢄ
ꢐꢆꢁꢆꢌꢆꢓꢆꢔꢉꢆꢙꢉꢄ
ꢈꢉꢆꢊꢋꢌꢍꢎꢉꢊꢄ
ꢐꢆꢁꢆꢌꢆꢓꢆꢔꢉꢆꢙꢉꢄ
ꢎ
ꢔꢕꢖꢗꢘꢙꢚ
ꢉꢄꢐꢇꢆꢉꢄꢉꢆ
ꢑꢊꢋꢒꢍꢓ
ꢘ"#ꢜꢊ
Once the conversion is finished ADC_convert returns to 00b,
status_adc_eoc is set, and the result data is available from
register 4 * ADC_D9-D2 + ADC_D1-D0.
Note: The ADC input ranges and gains are described in Figure 6
subsection ADC.
I²C Mode Serial Data Bus
The AS3630 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 AS3630 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
AS3630 works in both modes. Connections to the bus are made
through the open-drain I/O lines SDA and SCL.
The following bus protocol has been defined (Figure 37):
• Data transfer may be initiated only when the bus is not
busy.
• During data transfer, the data line must remain stable
whenever the clock line is HIGH. Changes in the data line
while the clock line is HIGH are interpreted as control
signals.
Accordingly, the following bus conditions have been defined:
Bus Not Busy
Both data and clock lines remain HIGH.
8A Supercap Flash Driver
AS3630 – 39
Start Data Transfer
A change in the state of the data line, from HIGH to LOW, while
the clock is HIGH, defines a START condition.
Stop Data Transfer
A change in the state of the data line, from LOW to HIGH, while
the clock line is HIGH, defines the STOP condition.
Data Valid
The state of the data line represents valid data when, after a
START condition, the data line is stable for the duration of the
HIGH period of the clock signal. The data on the line must be
changed during the LOW period of the clock signal. There is one
clock pulse per bit of data.
Each data transfer is initiated with a START condition and
terminated with a STOP condition. The number of data bytes
transferred between START and STOP conditions are not
limited, and are determined by the master device. The
information is transferred byte-wise and each receiver
acknowledges with a ninth bit.
Acknowledge
Each receiving 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.
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.
AS3630 – 40
8A Supercap Flash Driver
Figure AS3630 – 37:
Data Transfer on I²C Serial Bus
SDA
MSB
7 bit SLAVE
ADDRESS
R/W
DIREC-
TION
ACKNOWLEDGE-
MENT SIGNAL FROM
RECEIVER
ACKNOWLEDGE-
MENT SIGNAL FROM
RECEIVER
SCLK
1
9
1
2
6
7
8
2
3-7
8
9
ACK
STOP CONDITION
OR REPEATED
START CONDI-
START
CONDITION
REPEATED IF
MORE BYTES
ARE TRANS-
Depending upon the state of the R/W bit, two types of data
transfer are possible:
1. Data transfer from a master transmitter to a slave
receiver. The first byte transmitted by the master is the
slave address. Next follows a number of data bytes. The
slave returns an acknowledge bit after each received
byte. Data is transferred with the most significant bit
(MSB) first.
2. Data transfer from a slave transmitter to a master
receiver. 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 acknowledge bit after 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 conditions. A transfer is ended with
a STOP condition or with a repeated START condition.
Since a repeated START condition is also the beginning
of the next serial transfer, the bus is not released. Data
is transferred with the most significant bit (MSB) first.
The AS3630 can operate in the following two modes:
1. Slave Receiver Mode (Write Mode): Serial data and
clock are received through SDA and SCLK. After each
byte is received an acknowledge bit is transmitted.
START and STOP conditions are recognized as the
beginning and end of a serial transfer. Address
recognition is performed by hardware after reception of
the slave address and direction bit (see Figure 38). The
slave address byte is the first byte received after the
master generates the START condition. The slave
address byte contains the 7-bit AS3630 address, which
is shown in Figure 42, followed by the direction bit
11
(R/W), which, for a write, is 0. After receiving and
decoding the slave address byte the device outputs an
acknowledge on the SDA line. After the AS3630
8A Supercap Flash Driver
AS3630 – 41
acknowledges the slave address + write bit, the master
transmits a register address to the AS3630. This sets the
register pointer on the AS3630. The master may then
transmit zero or more bytes of data, with the AS3630
acknowledging each byte received. The 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
transmitted on SDA by the AS3630 while the serial clock
is input on SCLK. START and STOP conditions are
recognized as the beginning and end of a serial transfer
(Figure 39 and Figure 40). The slave address byte is the
first byte received after the master generates a START
condition. The slave address byte contains the 7-bit
AS3630 address, which is shown in Figure 42, followed
12
by the direction bit (R/W), which, for a read, is 1. After
receiving and decoding the slave address byte the
device outputs an acknowledge on the SDA line. The
AS3630 then begins to transmit data starting with the
register address pointed to by the register pointer. 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 pointer. The AS3630 must receive
a “not acknowledge” to end a read.
Figure AS3630 – 38:
Data Write - Slave Receiver Mode
<Data(n+X)>
XXXXXXXX
<Slave Address>
Figure 42
<Word Address (n)>
XXXXXXXX
<Data(n)>
<Data(n+1)>
XXXXXXXX
S
0
A
A
XXXXXXXX
A
A
A
P
S - Start
A - Acknowledge (ACK)
P - Stop
Data Transferred
(X + 1 Bytes + Acknowledge)
11. The address for writing to the AS3630 is shown in Figure 42
12. The address for read mode from the AS3630 is shown in Figure 42
AS3630 – 42
8A Supercap Flash Driver
Figure AS3630 – 39:
Data Read (from Current Pointer Location) - Slave Transmitter Mode
<Data(n+X)>
XXXXXXXX
<Slave Address>
Figure 42
<Data(n)>
<Data(n+1)>
XXXXXXXX
<Data(n+2)>
XXXXXXXX
S
1
A
XXXXXXXX
A
A
A
NA
P
S - Start
A - Acknowledge (ACK)
P - Stop
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
NA - Not Acknowledge (NACK)
Figure AS3630 – 40:
Data Read (Write Pointer, Then Read) - Slave Receive and Transmit
<Word Address (n)>
XXXXXXXX
A
<Slave Address>
Figure 42
S
Figure 42
0
A
Sr
1
A
<Data(n+1)>
XXXXXXXX
<Data(n+2)>
XXXXXXXX
<Data(n+X)>
XXXXXXXX
<Data(n)>
XXXXXXXX
A
A
A
NA
P
S - Start
Sr - Repeated Start
A - Acknowledge (ACK)
P - Stop
Data Transferred
(X + 1 Bytes + Acknowledge)
Note: Last data byte is followed by a NACK
NA - Not Acknowledge (NACK)
I²C Address Selection
Note: It is required to read the register Fixed ID twice after
startup in order for the I²C address selection to identify the I²C
address used.
The AS3630 features two I²C slave addresses without having a
dedicated address selection pin. The selection of the I²C address
is done with the interconnection of AS3630 to the bus lines
shown in the figure below. The serial interface logic inside
AS3630 is able to distinguish between a direct I²C connection
to the master or a second option where data and clock line are
crossed. Therefore it is possible to address a maximum of two
AS3630 slaves on one I²C bus.
8A Supercap Flash Driver
AS3630 – 43
Figure AS3630 – 41:
I²C Address Selection Application Diagram
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ꢜꢍꢌꢍꢏꢝꢀꢁꢂ
ꢀꢁꢂ
ꢀꢃꢄ
ꢇꢓ
ꢙꢘꢃ
ꢚꢍꢛꢌꢔꢒ
ꢖꢎꢐꢖ!ꢏꢝꢀꢃꢄ
ꢀꢅꢆꢇꢈꢉ
ꢁꢔꢕꢊꢖꢔꢏꢘ
ꢀꢁꢂ
ꢀꢃꢄ
ꢇꢓ
ꢀꢅꢆꢇꢈꢉ
The I²C address use is defined according to the figure below:
Figure AS3630 – 42:
I²C Addresses for AS3630
7 bit I²C
address
8 bit I²C read
address
8 bit I²C write
address
Device Number
Figure 41 on page 44
1
30h
31h
60h
62h
61h
63h
(default; SCLK and SDA directly connected)
2
(SCLK and SDA exchanged)
8A Supercap Flash Driver
AS3630 – 44
Register Description
Figure AS3630 – 43:
Register Overview
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
Fixed ID
fixed_id
RO
Access
00h
17h - fixed id (e.g. to check I²C communication)
Note: It is required to read the register Fixed ID twice after startup in order for the I²C address selection to identify the I²C address used.
Reset Value
Version
reserved
version
Access
RO
NA
RO
01h
Reset Value
X
Don't use by application
Don't use by application
8A Supercap Flash Driver
AS3630 – 45
Addr
Name
Current Set LED
Access
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
led_current
RW
Reset Value
15h (206mA)
LED Current pin LED_OUT; the range of this setting is defined by led_current_range
LSB is 9.8mA (2500mA/255) for led_current_range=00b
LSB is 980μA (250mA/255) for led_current_range=01b
LSB is 11.76mA (3000mA/255) for led_current_range=10b
led_current_range
11b
led_current
00b
0mA
01b
10b
02h
00h
01h
02h
03h
...
0mA
0mA
0mA
9.8mA
19.6mA
29.4mA
...
Don’t use
below
2506mA
(code D5h)
Don’t use
below
2996mA
(code BFh)
Don’t use below 10mA (code
0Bh)
D5h
...
2088mA
...
209mA
...
2506mA
...
3341mA
...
FFh
2500mA
250mA
3000mA
4000mA
AS3630 – 46
8A Supercap Flash Driver
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
Boost/TXMask
Current
curr_limit_curr_r
ed
led_current_range
coil1_txmask_curr_red
txmask_torch_mode
Access
RW
RW
0b
RW
RW
Reset Value
00b
011b
00b
Reduce L
current in steps of coil1_peak
DCDC1
Function of TXMASK/TORCH
pin
currents during TXMask
(this is a delta value; e.g. -1 means one current
step reduction e.g. from 2.5A to 2.0A; -4
means four steps e.g. from 2.5A to 750mA. if
the reduction would result in a negative value,
DCDC1 is switch off during TXMask event)
000 … -1
001 … -2
010 … -3
011 … -4 - default value
100 … -5
101 … -6
00 … no effect (default)
01 … txmask operation
mode (applies for flash
mode, mode_setting=111b)
10 … external torch mode
(applies for shutdown mode,
mode_setting=000b or
001b, max. led_current ≤
460mA)
Range setting for led_current
00...10-2500mA range
01...10-250mA range
10...2500-3000mA range
11...don’t use
03h
Comment
11 … don't use
use range “10” only for currents
above 2500mA
110 … -7
111 … -8
If set, reduce LED current if LDCDC1 and LDCDC2 currents are hit and current source ILED cannot drive
the output current.
Note: In flash mode LDCDC1 is usually operated in current limit.
8A Supercap Flash Driver
AS3630 – 47
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
Coil and Charge
Current
charge_current
coil2_peak
coil1_peak
Access
RW
RW
RW
Reset Value
01b
010b
100b
Defines charging current of
Supercap for pre-charge and
‘transition’ (to charge);
afterwards coil1_peak defines
current
LDCDC2 Coil Peak current limit
000 … don’t use
001 … don’t use
010 … 2.43A (default)
011 … 3.14A
LDCDC1 Coil Peak current limit
000 … don’t use
001 … 750mA
010 … 1A
04h
Comment
011 … 1.5A
00 … 200mA - low quiescent
current mode
100 … 3.86A
101 … 4.57A
100 … 2A (default)
101 … 2.5A
01 … 500mA
110 … 5.29 A
110 … 3A
10 ... 750mA
111 … 6.0A
111 … 3.5A
11 … 1000mA
AS3630 – 48
8A Supercap Flash Driver
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
Charge / Low
Voltage
bal_force_on
end_of_charge_voltage
vin_low_v
Access
RW
0b
RW
5h
RW
5h
Reset Value
Define Supercap end of charge
Note: In pre-charge the Supercap is always charged close to VVIN;
Reduce coil1_peak current if the VIN voltage
falls below vin_low_v -
0h function is disabled
1h 3.0V
2h 3.07V
3h 3.14V
4h 3.22V
5h 3.3V - default
6h 3.38V
therefore end_of_charge_voltage ≥ VVIN
05h
0h … 4.61V
1h … 4.7V
8h … 5.33V
9h … 5.42V
Ah … 5.51V
Bh … 5.61V
Ch … 5.7V
Dh … 5.79V
Eh … 5.88V
Fh … 5.97V
2h … 4.79V
3h … 4.88V
4h … 4.97V
5h … 5.06V (default)
6h … 5.15V
7h … 5.24V
7h 3.47V
0 … balancing circuit is enabled according to the operating mode
1 … balancing circuit is always enabled
8A Supercap Flash Driver
AS3630 – 49
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
ind_rampup_s
mooth
ind_rampdo
wn_smooth
Flash Timer
flash_timeout
Access
RW
1
RW
1
RW
0Fh
Reset Value
Flash timeout timer - define maximum flash time
4ms steps from 0…15h; 16ms steps from 16h to 63h
00h … 4ms
01h … 8ms
16h … 104ms
17h … 120ms
18h … 136ms
19h … 152ms
1Ah … 168ms
1Bh … 184ms
1Ch … 200ms
1Dh … 216ms
1Eh … 232ms
1Fh … 248ms
20h … 264ms
21h … 280ms
22h … 296ms
23h … 312ms
24h … 328ms
25h … 344ms
26h … 360ms
27h … 376ms
28h … 392ms
29h … 408ms
2Ah … 424ms
2Bh … 440ms
2Ch … 456ms
2Dh … 472ms
2Eh … 488ms
2Fh … 504ms
30h … 520ms
31h … 536ms
32h … 552ms
33h … 568ms
34h … 584ms
35h … 600ms
36h … 616ms
37h … 632ms
38h … 648ms
39h … 664ms
3Ah … 680ms
3Bh … 696ms
3Ch … 712ms
3Dh … 728ms
3Eh … 744ms
3Fh … 760ms
02h … 12ms
03h … 16ms
04h … 20ms
05h … 24ms
06h … 28ms
07h … 32ms
08h … 36ms
09h … 40ms
0Ah … 44ms
0Bh … 48ms
0Ch … 52ms
0Dh … 56ms
0Eh … 60ms
0Fh … 64ms
10h … 68ms
11h … 72ms
12h … 76ms
13h … 80ms
14h … 84ms
15h … 88ms
Smooth
rampdown
during
indicator
blinking if
ind_on=1
Smooth
rampup during
indicator
blinking if
ind_on=1
06h
0... none
1...smooth
(380ms)
0... none
1...smooth
(380ms)
AS3630 – 50
8A Supercap Flash Driver
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
keep_sc_ch
arged
Control
ind_on
mode_after_flash
ntc_on
mode_setting
Access
RW
0b
RW
RW
0b
RW
0b
RW
Reset Value
11b
001b
000 ... shutdown or external torch mode (leave
Supercap charged)
001 ... shutdown or external torch mode and
discharge Supercap with RDIS_CHARGE - default
010 ... pre charge Supercap (to VIN)
011 ... charge Supercap
100 ... torch operation (wo/ Supercap) - max.
led_current ≤ 460mA
101 ... PWM Operation (main LED); max.
led_current ≤ 303.9mA; led_current_range is
set to 00b
If set during
PWM,Torch
or Charge
operation
keep
Supercap
charged
with 10mA
current
Set the operating mode after
flash (see Figure 23 on page 27):
00... shutdown (leave Supercap
charged)
01... shutdown and discharge
Supercap
07h
Iindicator
Hardware
NTC
protection
of LED_OUT
0…off
current source
on IND_OUT
0 … off
1… on, (current
set by
10... pre charge Supercap (to VIN)
11... charge Supercap
1…on
ind_current)
110 ... torch operation sync to STROBE
(STROBE=1: LED on; STROBE=0: LED off) max.
led_current ≤ 931mA
111 ... Flash Operation
8A Supercap Flash Driver
AS3630 – 51
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
Strobe and ADC
control
strobe_on
strobe_type
ADC_convert
ADC_channel
Access
RW
1b
RW
1b
RW
RW
0h
Reset Value
00b
Select ADC channel for conversion
0h … V
DCDC
1h … LED_OUT
2h ... Tjunc (DIE Junction temperature)
3h … VSUPERCAP
4h ... don’t use
5h ... BAL
6h … VIN
7h ... NTC
8h … IND_OUT
9h ... don’t use
Ah ... PGND.
Control ADC conversion -
register is automatically reset to
00 after the conversion is
finished
08h
STROBE
input is
Enable STROBE
input
0 … edge
sensitive
1 … level
sensitive
Bh ... don’t use
Ch ... STROBE
Dh ... INT
Eh ... ON
Fh ... don’t use
00 … ADC shutdown (no conversion performed or end of conversion)
01 … start ADC conversion immediately
10 … do ADC conversion 1.5ms after current rampup (beginning of flash)
11 … do ADC conversion just before current rampdown (at end of flash; flash duration is extended
by 100μs)
AS3630 – 52
8A Supercap Flash Driver
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
status_adc_e
oc
fault_overte
mp
fault_timeo
ut
fault_current
_reduced
Fault / Status
status_eoc
fault_led
fault_sc_short
fault_ntc
1
Access
SS_RC
0b
SS_RC
0b
SS_RC
0b
SS_RC
0b
SS_RC
0b
SS_RC
0b
SS_RC
0b
SS_RC
Reset Value
0b
Detect a
shorted
Timeout has Supercap
LED
Overtemper
ture
detection
hit
(monitored
by NTC) (see
page 36)
Overtemper
Shorted or open ature
09h
End Of
ADC end of
conversion
reached (see
page 35)
LED Current
has been
reduced and
register
Supercap
Charge (see
page 35)
LED (LED_OUT)
detected (see
page 35)
(Tjunction)
triggered
(see
triggered
(see
page 36)
(BAL-GND) or
(VSUPERCAP-
BAL) during
charging (see
page 36)
page 36)
led_current_min reports min. led current during flash cycle (see page 37)
fault_current
_reduced_m
ask
status_eoc_mas status_adc_e
fault_overte
mp_mask
fault_timeo
ut_mask
fault_sc_short fault_ntc_m
Interrupt Mask
fault_led_mask
k
oc_mask
_mask
ask
Access
RW
0b
RW
0b
RW
0b
RW
0b
RW
0b
RW
0b
RW
0b
RW
0b
Reset Value
0Ah
If set,
overtemper
ature
(Tjunction)
triggers INT
If set, end of
Supercap
charge triggers
INT
If set ADC
end of
conversion
triggers INT
If set, a shorted
or open LED
(LED_OUT)
If set
If set
timeout
triggers INT
If set
fault_sc_short fault_ntc
triggers INT triggers INT
If set
fault_current
_reduced
triggers INT
triggers INT
8A Supercap Flash Driver
AS3630 – 53
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
PWM and
Indicator
ind_blink_delay
ind_current
led_out_pwm
Access
RW
RW
RW
Reset Value
01b
000b
000b
PWM modulate LED_OUT current if
mode_setting=PWM operation; automatically
uses led_current_range=00 (10mA...2500mA)
but limits current to 303.9mA (codes 00h...1Fh
for led_current)
Control indicator blinking
function delay between blinks if 000 … 1mA
IND_OUT current setting if ind_on=1
0Bh
ind_on=1
001 … 2mA
010 … 3mA
011 … 4mA
100 … 5mA
101 … 6mA
110 … 7mA
111 … 8mA
000 1/32 PWM at 15.625kHz- subharmonic
oscillation are possible - not recommended to
use
001 don’t use - use 1/16 instead
010 3/32 PWM at 15.625kHz
00 ... continuously on (no
blinking)
01 ... 512ms
10 ... 1024ms
11 ... 2048ms
011 don’t use - use 2/16 instead
100 1/16 PWM at 31.25kHz
101 2/16 PWM at 31.25kHz
110 3/16 PWM at 31.25kHz
111 4/16 PWM at 31.25kHz
Minimum LED
Current
led_current_min
Access
RO
0Ch
Reset Value
00h
At the beginning of a flash pulse, led_current_min is set to led_current then it is reduced upon following condition: (coil1_peak hit
and coil2_peak hit and curr_limit_curr_red=1); led_current_min has the same coding used as led_current (the current reduction
happens in steps as the coding of led_current is done)
AS3630 – 54
8A Supercap Flash Driver
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
ADC MSB
ADC_D9-D2
Access
RO
NA
0Dh
Reset Value
ADC MSB results bit 9 to bit 2
ADC LSB
Access
led_current_rampdown
ADC_D1-D0
RW
00
RO
NA
Reset Value
Automatically ramp-down of
LED current register led_current
during flash
0Eh
00 ... no ramp-down
ADC LSB results bit 1 to bit 0
01 ...1LSB every 100μs
10 ...1LSB every 200μs
11 ...1LSB every 500μs
8A Supercap Flash Driver
AS3630 – 55
Addr
Name
<D7>
test6
R/W
0
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
NTC
skip_enable
ind_blink_on_time
NTC_current
Access
RW
1
RW
10
RW
8h
Reset Value
Current through the NTC when overtemperature protection of
the LEDs (LED_OUT) is monitored
0h … off; use for an external drive of NTC
1h … 40μA
2h … 80μA
3h … 120μA
4h … 160μA
5h … 200μA
6h … 240μA
7h … 280μA
8h … 320μA - default
9h … 360μA
Ah … 400μA
Allow
Control indicator blinking
on-time if ind_on=1 (excluding
rampup/down)
pulse-skip
operation or
force 4MHz
operation
0Fh
Test bit - don’t
use
00 ... 0ms (immediate
ramp-down after ramp-up)
01 ... 128ms
0...4MHz
operation
1...pulse-skip 11 ... 512ms
10 ... 256ms - default
Bh … 440μA
Ch … 480μA
Dh … 520μA
Eh … 560μA
Fh … 600μA
OTP1
OTP_data1
Access
RO
NA
10h
Reset Value
Data of OTP
AS3630 – 56
8A Supercap Flash Driver
Addr
Name
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
OTP2
OTP_data2
Access
RO
NA
11h
Reset Value
Data of OTP
OTP3
OTP_data3
Access
RO
NA
12h
13h
Reset Value
Data of OTP
OTP_lock
RO
OTP4
OTP_data4
Access
RO
NA
Reset Value
NA
Data of OTP
0 ... OTP is program-able (unlocked)
1... OTP is locked and no further programming of OTP is possible
1. SS_RC = automatically cleared upon readout
8A Supercap Flash Driver
AS3630 – 57
Register Map
Figure AS3630 – 44:
Register Map
Addr
00h
Name
Fixed ID
Version
Default
17h
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
fixed_id
01h
XXh
reserved
version
Current Set
LED
02h
03h
15h
0Ch
led_current
Boost/TXMas
k Current
curr_limit_curr
_red
led_current_range
charge_current
coil1_txmask_curr_red
txmask_torch_mode
Coil and
Charge
Current
04h
54h
coil2_peak
coil1_peak
Charge / Low
Voltage
05h
06h
07h
08h
09h
2Dh
CFh
61h
C0h
00h
bal_force_on
ind_rampup_s ind_rampdo
end_of_charge_voltage
vin_low_v
mode_setting
fault_ntc
Flash Timer
Control
flash_timeout
mooth
wn_smooth
keep_sc_ch
arged
ind_on
mode_after_flash
ntc_on
Strobe and
ADC control
strobe_on
status_eoc
strobe_type
ADC_convert
ADC_channel
Fault /
status_adc_
eoc
fault_overt fault_timeo fault_sc_shor
emp ut
fault_curren
t_reduced
fault_led
1
t
Status
AS3630 – 58
8A Supercap Flash Driver
Addr
Name
Default
<D7>
<D6>
<D5>
<D4>
<D3>
<D2>
<D1>
<D0>
fault_curren
t_reduced_
mask
Interrupt
Mask
status_eoc_m
ask
status_adc_
eoc_mask
fault_overt fault_timeo fault_sc_shor
fault_ntc_
mask
0Ah
00h
fault_led_mask
emp_mask
ut_mask
t_mask
PWM and
Indicator
0Bh
0Ch
40h
NA
ind_blink_delay
ind_current
led_out_pwm
Minimum
LED Current
led_current_min
0Dh
0Eh
0Fh
10h
11h
12h
13h
ADC MSB
ADC LSB
NTC
NA
0Xh
68h
NA
NA
NA
NA
ADC_D9-D2
0
led_current_rampdown
0
0
0
ADC_D1-D0
test6
skip_enable
ind_blink_on_time
OTP_data1
NTC_current
2
OTP1
OTP2
OTP_data2
OTP_data3
OTP3
OTP4
OTP_lock
OTP_data4
Read-Only Register
R/W Register
if writing to read-only register is required, write ‘0’ to read-only positions
(e.g. ADC LSB)
1. The register Fault / Status is a read only register, which is automatically cleared after readout. Therefore only a single I²C access is required to poll the status of the AS3630.
2. If OTP data are fused in-circuit, expect a small yield loss.
8A Supercap Flash Driver
AS3630 – 59
Application Information
External Components
Supercap
The Supercap performance is critical for the performance of
AS3630. As the Supercap is affected by aging, the flash
performance has to be checked at end of life conditions.
Figure AS3630 – 45:
Recommended Supercap’s
Rated
ESR Voltage
Peak
Rated1
Voltage
Match
ing2
Temp
Range3
Part
C
Manufact
urer
Size
Number
DME2Z5R5K43 430mF
-30ºC...
+70ºC
20.5x18.5
x3.2mm
50mΩ
60mΩ
60mΩ
5.5V
5.5V
5.5V
4.2V
4.2V
4.2V
<5%
<5%
<5%
4M3BT
20%
Murata
www.murat
a.com
DME2U5R5L35 350mF
4M3BT 20%
-30ºC...
+70ºC
20.5x18.5
x3.0mm
DMF3R5R5L35 350mF
-30ºC...
+70ºC
21.0x14.0
x2.5mm
4M3DTA0
20%
TDK
EDLC082644-3
31-2F-11
-20ºC...
+70ºC
26x44
x0.8mm
www.tdk-
component
s.com
330mF 80mΩ
5.5V
3.2V
1. Can be applied constantly
2. Difference of Capacitance of top capacitor (between VSUPERCAP/BAL) to capacitance of bottom capacitor (between BAL/GND).
3. Operating temperature range
AS3630 – 60
8A Supercap Flash Driver
LEDs
The LED with its optics and its performance are a key element
in a Supercap LED flash. Therefore use 2 high power LEDs with
lowest forward voltage.
Figure AS3630 – 46:
Recommended LEDs
ILED
@ 25ºC
ILED peak
@ 25ºC
Part
Number
Vf
@ 1A
Brightness
@ 1A
Size
Manufacturer
2500mA, t ≤ 2x1.64x0.6
3.5V
(max. 4.2V)
30mA-120
0mA
Osram-OS
CUW CFUP
CL-778
250-355lm
10ms,
3mm, max
H 0.74mm
www.osram-os.com
duty=0.005
Citizen Electronics
ce.citizen.co.jp/lighting
_led/en/index.html
2.24x1.84x
0.75mm
Lumileds
www.philipslumileds.c
om
LXCL-LW07
3000mA
Input Capacitor CVIN
Low ESR input capacitors reduce input switching noise and
reduce the peak current drawn from the battery. Ceramic
capacitors are required for input decoupling and should be
located as close to the device as is practical.
Figure AS3630 – 47:
Recommended Input Capacitor
Related
Voltage
Part Number
C
TC Code
Size
Manufacturer
10μ
>3μF@4.5V
>2μF@5.25V
Murata
GRM188R60J106ME47
LMK107BBJ106MA
X5R
X5R
6V3
0603
0603
www.murata.com
10μ
>3μF@4.5V
Taiyo Yuden
www.t-yuden.com
6V3
If a different input capacitor is chosen, ensure similar ESR value
and at least 3μF capacitance at the maximum input supply
voltage. Larger capacitor values (C) may be used without
limitations.
Optionally add a smaller capacitor in parallel to the input pin
VIN (e.g. Murata GRM155R61C104, >50nF @ 3V, 0402 size).
8A Supercap Flash Driver
AS3630 – 61
Output Capacitor CDCDC1, CDCDC2
Low ESR capacitors should be used to minimize V
ripple
DCDC
and therefore current ripple on the LED. Multi-layer ceramic
capacitors are recommended since they have extremely low
ESR and are available in small footprints. The capacitor should
be located as close to the device as is practical.
X5R dielectric material is recommended due to their ability to
maintain capacitance over wide voltage and temperature
range.
Figure AS3630 – 48:
Recommended DCDCs Capacitor
Related
Voltage
Part Number
C
TC Code
Size
Manufacturer
10μF 20%
>4.8μF@5V
GRM219R61A106ME47
GRM219R61A106ME44
0805
(2.0x1.25x0.85mm
max 1mm height)
Murata
www.murata.com
X5R
10V
10μF 10%
>4.05μF@5V
1
2x0805
(2.0x1.25x0.85mm
max 0.95mm
height)
TDK
www.tdk.com
2
10μF 20%
X5R
10V
2 x C2012X5R1A106M
1. If TAMB<70ºC or higher output voltage ripple can be tolerated.
2. Use 2 in parallel for CDCDC1 and CDCDC2 to reach the required output capacitor of >4.2μF capacitance at 5V.
If a different output capacitor is chosen, ensure similar ESR
values and at least 4.2μF capacitance at 5V output voltage and
for CDCDC1 10V voltage rating, CDCDC2 6.3V voltage rating.
Inductor LDCDC1
L
is used for charging of the Supercap, operate the LED in
DCDC1
torch and PWM operation and in parallel to L
to power the
DCDC2
LED during flash. Due to the different durations of the operation
modes, different peak current limits apply (see Figure 49).
The fast switching frequency (4MHz) of the AS3649 allows for
the use of small SMDs for the external inductor. The saturation
current ISATURATION should be chosen to be above the
13
maximum value of ILDCCD1 . The inductor should have very
low DC resistance (DCR) to reduce the I2R power losses - high
DCR values will reduce efficiency.
13. Can be adjusted in I²C mode with register coil1_peak
AS3630 – 62
8A Supercap Flash Driver
Figure AS3630 – 49:
Recommended Inductor
max. coil1_peak
setting for
Part Number
L
DCR
Size
Manufacturer
Other modes Flash
1.0μH
LQM32PN1R0MG0 >0.6μH @
3.0A
3.2x2.5x0.9mm
max 1.0mm
height
Murata
1
60mΩ
2.0A
2.5A
3.0A
www.murata.com
3.2x3x1.2
mm
height is max
3.0A
1.0μH
SPM3012T-1R0M
20%
57mΩ
10%
TDK
www.tdk.com
2
(3.5A )
1.0μH
>0.7μH @
2.7A
>0.6μH @
3.0A
Samsung
Electro-Mechancs
www.sem.samsun
g.co.kr
3.2x2.5mm
max 1.0mm
height
60mΩ
25%
CIG32W1R0MNE
CKP3225N1R0M
2.0A
3.0A
1.0μH
3.2x2.5x0.9mm
max 1.0mm
height
3
>0.6μH @ <60mΩ
1.0A
2.5A
3.0A
3.0A
Taiyo Yuden
www.t-yuden.com
1.0μH
2.5x2.0x1.2mm
height is max
MAMK2520T1R0M >0.6μH@
2.75A
45mΩ
2.5A
1. Flash pattern: 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again (no limit on the number of total cycles)
Alternative pattern with 1000ms/1.6A, 200ms pause, 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again. (no limit on the number of
total cycles)
2. Check with coil supplier
3. Check with coil supplier for worst case flash pattern.
If a different inductor is chosen, ensure similar DCR values and
at least0.6μH inductance at ILDCCD1 set by coil1_peak.
Inductor LDCDC2
L
is used in parallel to L
to power the LED during
DCDC1
DCDC2
flash. The whole current from the Supercap flows through
therefore a high power inductor is required.
L
DCDC2
The fast switching frequency (4MHz) of the AS3649 allows for
the use of small SMDs for the external inductor. The saturation
current ISATURATION should be chosen to be above the
14
maximum value of ILDCCD2 . The inductor should have very
low DC resistance (DCR) to reduce the I2R power losses - high
DCR values will reduce efficiency
14. Can be adjusted in I²C mode with register coil2_peak
8A Supercap Flash Driver
AS3630 – 63
Figure AS3630 – 50:
Recommended Inductor
max.
coil2_peak
setting
Part Number
L
DCR
Size
Manufacturer
4.06x4.45x1
.5mm
height is
max
1
1.0μH
>0.6μH @ 6.0A
6.0A
MPI4040R2-1R0-R
25mΩ
(max. value)
Coiltronics (Cooper
Bussmann)
www.cooperbussmann.c
om
4.06x4.45x1
.2mm
height is
max
1.0μH
>0.6μH @ 6.0A
check with
coiltronics
MPI4040R1-1R0-R
40mΩ
4x4x2mm
max 2.1mm
height
1.0μH
>0.6μH @ 6.0A
6.0A
(max. value)
XAL4020-102ME_
XFL4020-102ME_
13.25mΩ
14.4mΩ
Coilcraft
www.coilcraft.com
1.0μH
>0.6μH @
5.29A
4x4x2mm
max 2.1mm
height
5.29A
4.57A
3.0A
4.4x4.1x1.2
mm
height is
max
SPM4012T-1R0M
SPM3012T-1R0M
1.0μH 20%
1.0μH 20%
38mΩ
TDK
www.tdk.com
3.2x3x1.2
mm
height is
max
57mΩ
10%
2
(3.5A )
3.2x2.5x0.9
mm
max 1.0mm
height
1.0μH
>0.6μH @ 3.0A
Murata
3
LQM32PN1R0MG0
CIG32W1R0MNE
CKP3225N1R0M
60mΩ
3.0A
www.murata.com
1.0μH
>0.7μH @ 2.7A
>0.6μH @ 3.0A
3.2x2.5mm
max 1.0mm
height
Samsung
Electro-Mechancs
www.sem.samsung.co.kr
60mΩ
25%
3.0A
3.2x2.5x0.9
mm
max 1.0mm
height
1.0μH
>0.6μH @ 3.0A
Taiyo Yuden
www.t-yuden.com
4
<60mΩ
3.0A
1. Flash profile and max. TAMB to be checked with coil manufacturer.
2. Check with coil supplier
3. Flash pattern: 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again (no limit on the number of total cycles)
Alternative pattern with 1000ms/1.6A, 200ms pause, 200ms/3A, 200ms pause, 200ms/3A, 2s then repeat again. (no limit on the number of
total cycles)
4. Check with coil supplier for worst case flash pattern.
If a different inductor is chosen, ensure similar DCR values and
at least0.6μH inductance at ILDCCD2 set by coil2_peak.
AS3630 – 64
8A Supercap Flash Driver
Thermistor (NTC)
The NTC is used to protect the LED against overheating
(hardware protection inside the AS3649, which works without
any software - see “NTC - Flash LED Overtemperature Protection
- fault_ntc” on page 37.
The thermistor has to be thermally coupled to the LED (and
therefore as close as possible to the LED) and it shall not share
the same ground connection as the LED return ground (if they
share the same ground connection the high current through
the LED will offset the measurement of the NTC).
Figure AS3630 – 51:
Recommended Thermistors
Part Number
NCP02WF104F05RH
NCP02XH103F05RH
NCP03WL224E05RL
NCP03WL104E05RL
NCP15WF104F03RC
NCP15WL683J03RC
NTCG104QH224HT
NTCG104EF104FT
NTCG104LH683JT
NTCG104BF683JT
Resistance @ 25ºC B-constant 25/50ºC
Size
Manufacturer
100kΩ 1%
10kΩ 1%
220kΩ 3%
100kΩ 3%
100kΩ
4250k 1%
3380k 1%
4485K 1%
4485K 1%
01005 (inch)
01005 (inch)
Murata
www.murata.com
0201 (inch)
0402 (inch)
68kΩ
220kΩ 3%
100kΩ 1%
4750k 3%
4250k 1%
4550k 3%
4085k 1%
TDK
www.tdk.com
1.0x0.5mm
68kΩ 5%
It is recommended to use 220kΩ resistance for a detection
threshold of 125ºC, 100kΩ for 110ºC and 68kΩ for 80ºC LED
temperature detection threshold.
8A Supercap Flash Driver
AS3630 – 65
The high speed operation requires proper layout for optimum
performance. Route the power traces first and try to minimize
the area and wire length.
PCB Layout Guideline
At the pin GND a single via (or more vias, which are closely
combined) connects to the common ground plane. This via(s)
will isolate the DCDC high frequency currents from the common
ground - see the ‘ground via’ in Figure 52.
Figure AS3630 – 52:
Layout Recommendation Using a 3225 Coil for L
and L
DCDC2
DCDC1
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Note:
If component placement rules allow, move all components close to the AS3630.
The NTC ground connection shall be separated from the main ground and directly connected to AGND (Ball A5).
The recommended PCB pad size for the AS3630 is 250μm.
AS3630 – 66
8A Supercap Flash Driver
Drive 4 LEDs
In order to drive 4 LEDs at a maximum current of up to 4x3A =
15
12A using a single Supercap, two AS3630 can be used. The I²C
connections can be combined as the AS3630 supports two I²C
addresses (see “I²C Address Selection” on page 43). Use the
circuit shown in the figure below- to synchronize the flash
pulses use the STROBE input:
Figure AS3630 – 53:
Combining Two AS3630 Using a Single Supercap
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15. Will depend on the Supercap and LEDs VF which flash current / flash duration can be used.
8A Supercap Flash Driver
AS3630 – 67
Package Drawings and Markings
Figure AS3630 – 54:
25pin WL-CSP Marking
Notes:
1. Line 1 : ams AG logo
2. Line 2 : AS3630
3. Line 3 : <Code> (Encoded Datecode - 4 characters)
Figure AS3630 – 55:
25pin WL-CSP Package Dimensions
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Note: The coplanarity of the balls is 40μm
AS3630 – 68
8A Supercap Flash Driver
The devices are available as standard products as shown below.
Ordering Information
Figure AS3630 – 56:
Ordering Information
Ordering Code
Description
Delivery
Package
25-pin WL-CSP
Tape & Reel 5x5 balls 0.5mm pitch, 2.5x2.5x0.6mm size
RoHS compliant / Pb-Free
8A Supercap Flash Driver
with Torch and Indicator
AS3630-ZWLT
AS3630-ZWLT:
AS3630-
Z : Temperature Range: -30ºC - 85ºC
WL : Package: Wafer Level Chip Scale Package (WL-CSP)
T : Delivery Form: Tape & Reel
Note:
All products are RoHS compliant and ams green.
Buy our products or get free samples online at www.ams.com/ICdirect
Technical Support is available at www.ams.com/Technical-Support
For further information and requests, email us at sales@ams.com
(or) find your local distributor at www.ams.com/distributor
8A Supercap Flash Driver
AS3630 – 69
The PCB assembly should be instrumented and the reflow
oven’s process parameters established to ensure the solder
paste manufacturer’s reflow profile specification is met during
the assembly process. See Figure below.
Soldering Information
The maximum PCB temperature recommended by the supplier
must not be exceeded.
Figure AS3630 – 57:
Solder Reflow Profile
Profile Feature
Lead-free Assembly
Average ramp-up rate (Ts
to T )
3 °C/second max.
max
P
Preheat
150 °C
200 °C
60 – 120 seconds
• Temperature Min (Ts
• Temperature Max (Ts
• Time (t )
)
min
)
max
L
Time maintained above:
217 °C
60 – 150 seconds
• Temperature (T )
L
• Time (t )
L
Peak/classification temperature (T )
260 °C
P
Time within 5 °C of actual peak temperature (T )
30 seconds
P
Ramp-down rate
6 °C/second max.
8 minutes max.
Time 25 °C to peak temperature
JEDEC standard Lead-free reflow profile: According to J-STD-020D.
Figure AS3630 – 58:
Recommended Reflow Soldering Profile
tP
TP
Critical
Zone
Ramp
Up
TL to TP
TL
TL
Tsmax
Ramp Down
Tsmin
TL
25
Time [s]
t 25°C to Peak Temperature
AS3630 – 70
8A Supercap Flash Driver
The term RoHS compliant means that ams products fully comply
with current RoHS directive. Our semiconductor products do
not contain any chemicals for all 6 substance categories,
including the requirement that lead not exceed 0.1% by weight
in homogeneous materials. Where designed to be soldered at
high temperatures, RoHS compliant products are suitable for
use in specified lead-free processes. ams Green means RoHS
compliant and no Sb/Br). ams defines Green that additionally
to RoHS compliance our products are free of Bromine (Br) and
Antimony (Sb) based flame retardants (Br or Sb do not exceed
0.1% by weight in homogeneous material).
RoHS Compliant and ams Green
Statement
Important Information and Disclaimer The information
provided in this statement represents ams knowledge and
belief as of the date that it is provided. ams bases its knowledge
and belief on information provided by third parties, and makes
no representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams has taken and continues to
take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams
and ams suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
8A Supercap Flash Driver
AS3630 – 71
Copyright © 1997-2013, ams 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.
Copyrights
Disclaimer
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its Term of Sale. ams
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. ams 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 ams AG for current information. This
product is intended for use in normal commercial applications.
Applications requiring extended temperature range, unusual
environmental requirements, or high reliability applications,
such as military, medical life-support or life-sustaining
equipment are specifically not recommended without
additional processing by ams AG for each application. For
shipments of less than 100 parts the manufacturing flow might
show deviations from the standard production flow, such as test
flow or test location.
The information furnished here by ams AG is believed to be
correct and accurate. However, ams AG shall not be liable to
recipient or any third party for any damages, including but not
limited to personal injury, property damage, loss of profits, loss
of use, interruption of business or indirect, special, incidental
or consequential damages, of any kind, in connection with or
arising out of the furnishing, performance or use of the
technical data herein. No obligation or liability to recipient or
any third party shall arise or flow out of ams AG rendering of
technical or other services.
AS3630 – 72
8A Supercap Flash Driver
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