SX9513B [SEMTECH]
8 Capacitive Buttons, LEDs and Proximity Controller with Analog Outputs;
| 型号： | SX9513B |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | 8 Capacitive Buttons, LEDs and Proximity Controller with Analog Outputs |
| 文件： | 总53页 (文件大小：1546K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
GENERAL
D
ESCRIPTION
KEY PRODUCT FEATURES
The SX9512/12B and SX9513/13B are 8–button
capacitive touch sensor controllers that include 8-
channels of LED drivers, a buzzer and analog
outputs designed ideally for TV applications. The
SX9512/12B offers proximity sensing.
´ Separate Core and I/O Supplies
o 2.7V – 5.5V Core Supply Voltage
o 1.65V – 5.5V I/O Supply Voltage
´
Support Metal Overlay UI Design (SX9512/12B)
The SX9512/12B and SX9513/13B operate ´ 8 - Button Capacitance Controller
autonomously using a set of programmable button
sensitivities & thresholds, plus LED intensities &
o Adaptive Measurements For Reliable Proximity And
breathing functions with no external I2C
o Capacitance Offset Compensation to 40pF
Button Detection
communication required.
´ Proximity Sensing (SX9512/12B)
o High Sensitivity
All devices feature three individual LED driver
engines for advanced LED lighting control. On the
SX9512/12B, a proximity detection illuminates all
LEDs to a pre-programmed intensity. Touching a
button will enable the corresponding LED to a pre-
programmed mode such as intensity, blinking or
breathing.
o LEDs Activated During Proximity Sense
´ 8-channel LED Controller & Driver
o Blink And Breathing Control
o High Current, 15 mA LED Outputs
Whenever the capacitive value changes from ´ 2-Channel Analog Output, 6-bit DAC Programmable
either
a
proximity
detection
or
finger
Control
touch/release, the controller informs the host
processor through the analog output(s) or an open
drain interrupt and an I2C register read.
´ Programmable Buzzer
´ Simple (400kHz) I2C Serial Interface
o Interrupt Driven Communication via NIRQ Output
The SX9512/12B and SX9513/13B do not require
additional external dynamic programming support ´ Power-On Reset, NRST Pin and Soft Reset
or setting of parameters and will adapt to humidity
and temperature changes to guarantee correct
touch/no touch information.
´ Low Power
o Sleep, Proximity Sensing: 330uA
o Operating: 600uA
The B versions have a different pre-programmed
I2C address.
´ -40°C to +85°C Operation
´ 4.0 mm x 4.0 mm, 20-lead QFN package
´ 4.4 mm x 7.8 mm, 24-lead TSSOP package
´ Pb & Halogen free, RoHS/WEEE compliant
The SX9512/12B and SX9513/13B are offered in
20-ld QFN and 24-ld TSSOP packages and operate
over an ambient temperature range of -40°C to
+85°C.
APPLICATIONS
´ LCD TVs, Monitors
T
YPICAL APPLICATION CIRCUIT
´ White Goods
VDD
SVDD
CAPACITIVE
TOUCH BUTTONS
´ Consumer Products, Instrumentation, Automotive
´ Mechanical Button Replacement
LED [7:0]
SX9512/12B/13/13B
BL0
PWRON
NRST
BL1
BL2
BL3
O
RDERING INFORMATION
CONTROL
Part Number
SX9513EWLTRT1
SX9513ETSTRT2
SX9512EWLTRT1
SX9512ETSTRT2
SX9513BEWLTRT1
SX9513BETSTRT2
SX9512BEWLTRT1
SX9512BETSTRT2
SX9510EVK
Package
QFN-20
Marking
ZF3A
AOUT2/
NIRQ/
BUZZER/
PWRSTATE
SPO2
SPO1
GPO/LED
ENGINE
TOUCH
BUTTON &
LED
DRIVER
INTERFACE
AC70R
ZH57
AC71S
ZB13
AB13G
Z8CA
AB12F
-
TSSOP-24
QFN-20
AOUT1
SVDD
POR
OSC
BL4
BL5
ANALOG
OUTPUT
TSSOP-24
QFN-20
SDA
SCL
BL6
BL7
I2C
TSSOP-24
QFN-20
NVM
TSSOP-24
Evaluation Kit
LS
GND
1 3000 Units/Reel
2 2500 Units/Reel
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SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
Table of Contents
G
ENERAL
YPICAL
EY RODUCT
PPLICATIONS.......................................................................................................................................1
RDERING NFORMATION......................................................................................................................1
ENERAL ESCRIPTION...............................................................................................................4
D
ESCRIPTION........................................................................................................................1
PPLICATION CIRCUIT............................................................................................................1
EATURES.....................................................................................................................1
T
A
K
A
P
F
O
1
I
G
D
1.1
1.2
1.3
1.4
1.5
1.6
Pin Diagram
4
4
5
7
8
8
Marking information SX9513/13B
Marking information SX9512/12B
Pin Description
Simplified Block Diagram
Acronyms
2
3
ELECTRICAL CHARACTERISTICS .................................................................................................9
2.1
2.2
2.3
2.4
Absolute Maximum Ratings
Recommended Operating Conditions
Thermal Characteristics
9
9
9
Electrical Specifications
10
F
UNCTIONAL DESCRIPTION........................................................................................................ 12
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
Introduction
12
13
14
14
15
16
16
18
21
21
21
21
23
25
Scan Period
Operation modes
Sensors on the PCB
Button Information
Buzzer
Analog Output Interface
Analog Sensing Interface
Configuration
Clock Circuitry
I2C interface
3.10
3.11
3.12
3.13
3.14
Interrupt
Reset
LEDS on BL
4
DETAILED CONFIGURATION DESCRIPTIONS .............................................................................. 29
4.1
4.2
4.3
4.4
4.5
4.6
Introduction
29
31
34
38
43
44
General Control and Status
LED Control
CapSense Control
SPO Control
Buzzer Control
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SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
4.7
Real Time Sensor Data Readback
45
5
6
I2C INTERFACE........................................................................................................................... 47
5.1
5.2
I2C Write
I2C read
47
48
P
ACKAGING
I
NFORMATION ........................................................................................................ 49
6.1
6.2
Package Outline Drawing
Land Pattern
49
51
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SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
1
G
ENERAL
DESCRIPTION
1.1
Pin Diagram
24
23
22
21
20
19
18
17
16
VDD
1
2
3
4
5
6
7
8
GND
LS
VDD
GND
SPO2
SPO1
NC
BL7
BL6
BL5
BL4
BL3
BL2
BL1
Top View
PWRON
NRST
NC
9
15
14
SCL
SDA
10
11
BL0
NC
13
SVDD
12
NC
Figure 1 Pinout Diagram (QFN, TSSOP)
1.2
Marking information SX9513/13B
ZF3A
yyww
xxxxx
AC70R
yyww
xxxxxxxx
yyww = Date Code
xxxxx = Semtech lot number
yyww
= Date Code
xxxxxxxx
= Semtech l
ot
Figure 2 Marking Information SX9513 (QFN, TSSOP)
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SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
ZB13
yyww
xxxxx
yyww = Date Code
xxxxx = Semtech lot number
Figure 3 Marking Information SX9513B (QFN, TSSOP)
1.3
Marking information SX9512/12B
ZH57
yyww
xxxxx
AC71S
yyww
xxxxxxxx
yyww = Date Code
xxxxx = Semtech lot number
yyww
xxxxxxxx
= Date Code
= Semtech lo
t
Figure 4 Marking Information SX9512 (QFN, TSSOP)
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SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
Z8CA
yyww
xxxxx
yyww = Date Code
xxxxx = Semtech lot number
Figure 5 Marking Information SX9512B (QFN, TSSOP)
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SX9512/12B/13/13B
8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
1.4
Pin Description
Pin
Pin
Name
Type
Description
QFN
TSSOP
1
2
3
4
5
6
7
8
4
5
BL6
BL5
Analog
Analog
Analog
Analog
Analog
Analog
Analog
Power
Button Sensor and Led Driver 6
Button Sensor and Led Driver 5
Button Sensor and Led Driver 4
Button Sensor and Led Driver 3
Button Sensor and Led Driver 2
Button Sensor and Led Driver 1
Button Sensor and Led Driver 0
IO Power Supply, SVDD must be ≤ VDD
6
BL4
7
BL3
8
BL2
9
BL1
10
13
BL0
SVDD
9
14
SDA
Digital Input/Output I2C Data, requires pull up resistor to SVDD (in host or external)
10
11
12
15
17
18
SCL
NRST
Digital Input
Digital Input
Digital Output
I2C Clock, requires pull up resistor to SVDD(in host or external)
Active Low Reset. Connect to SVDD if not used.
PWRON
Power On Signal (positive edge triggered, push pull)
Special Purpose Output 1:
- AOUT1: Analog Voltage indicating touched buttons (filtered digital)
14
20
SPO1
SPO2
Analog
Special Purpose Output 2:
- AOUT2: Analog Voltage indicating touched buttons (filtered digital)
- BUZZER: Driver (digital push-pull output)
15
21
Analog/Digital
- NIRQ: Interrupt Output, active low (digital open drain output)
- PWRSTATE: Signal indicating system power state (digital input)
16
17
18
19
20
22
23
24
2
GND
VDD
VDD
LS
Ground
Power
Power
Analog
Analog
Ground
Power Supply
Power Supply
Led Sink/Shield
Button Sensor and Led Driver 7
3
BL7
bottom
plate
1
GND
NC
Ground
Connect to ground
Leave Floating
11, 12,
16, 19
13
No Connect
Table 1 Pin description
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8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
1.5
Simplified Block Diagram
VDD
SVDD
CAPACITIVE
TOUCH BUTTONS
LED [7:0]
SX9512/12B/13/13B
BL0
PWRON
BL1
BL2
BL3
CONTROL
NRST
AOUT2/
SPO2
NIRQ/
GPO/LED
ENGINE
BUZZER/
PWRSTATE
TOUCH
BUTTON &
LED
DRIVER
INTERFACE
SPO1
AOUT1
SVDD
POR
OSC
BL4
BL5
ANALOG
OUTPUT
SDA
SCL
BL6
BL7
I2C
NVM
LS
GND
Figure 6 Simplified Block diagram
1.6
Acronyms
AOI
ASI
NVM
PWM
SPO
Analog Output Interface
Analog Sensor Interface
Non Volatile Memory
Pulse Width Modulation
Special Purpose Output
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8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
2
E
LECTRICAL
CHARACTERISTICS
2.1
Absolute Maximum Ratings
Stresses above the values listed in “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at these, or any other conditions beyond the “Recommended Operating
Conditions”, is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameter
Symbol
VDD, SVDD
VIN
Min.
-0.5
-0.5
-10
Max.
6.0
Unit
V
Supply Voltage
Input voltage (non-supply pins)
Input current (non-supply pins)
Operating Junction Temperature
Reflow temperature
VDD + 0.3
10
V
IIN
mA
°C
°C
°C
kV
mA
TJCT
-40
150
TRE
260
Storage temperature
ESD HBM (Human Body model)(i)
Latchup(ii)
TSTOR
ESDHBM
-50
3
150
ILU
± 100
Table 2 Absolute Maximum Ratings
(i) Tested to JEDEC standard JESD22-A114
(ii) Tested to JEDEC standard JESD78
2.2
Recommended Operating Conditions
Parameter
Symbol
VDD
Min.
2.7
Max.
5.5
Unit
V
Supply Voltage
Supply Voltage (SVDD must be ≤ VDD)
Ambient Temperature Range
SVDD
TA
1.65
-40
5.5
V
85
°C
Table 3 Recommended Operating Conditions
2.3
Thermal Characteristics
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Thermal Resistance- QFN package - Junction to Ambient
Thermal Resistance –TSSOP package - Junction to Ambient
Note (vi)
25
78
°C/W
θJA,QFN
Note (vi)
°C/W
θJA,SSOP
Table 4 Thermal Characteristics
(vi) ThetaJA is calculated from a package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias under
exposed pad (if applicable) per JESD51 standards.
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8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
WIRELESS & SENSING PRODUCTS
DATASHEET
2.4
Electrical Specifications
All values are valid within the operating conditions unless otherwise specified.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Current consumption
All buttons are scanned at a
200ms rate. (40ms scan with
skip 4 frames)
Sleep
Isleep
330
600
350
650
uA
uA
All buttons are scanned at a 40
ms rate, excluding LED forward
current.
Operating
Ioperating
Input Levels NRST, SCL, SDA, SPO2 (in PWRSTATE mode)
Input logic high
VIH
VIL
LI
0.7*SVDD
GND - 0.3
SVDD + 0.3
0.3*SVDD
±1
V
Input logic low
GND applied to GND pins
CMOS input
V
Input leakage current
Output PWRON, SPO1, SPO2, SDA
uA
Output logic high
(PWRON, SP01, & SPO2 Only)
VOH
VOL
IOH<3mA
IOL,<6mA
SVDD-0.4
V
V
Output logic low
0.6
10
CapSense Interface
Offset Compensation Range
Coff
40
pF
Power up time
tpor
ms
Reset
Power on reset voltage
Vpor
1.1
1
V
Reset time after power on
Reset pulse width on NRST
tpor
ms
ns
tres
20
Recommended External components
capacitor between SVDD, GND
capacitor between VDD, GND
Cvreg
Cvdd
tolerance +/-20%
tolerance +/-20%
Table 5 Electrical Specifications
0.1
0.1
uF
uF
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8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
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Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
I2C Timing Specifications (i)
SCL clock frequency
fSCL
400
KHz
us
us
ns
us
ns
us
us
us
us
SCL low period
tLOW
1.3
0.6
100
SCL high period
tHIGH
tSU;DAT
Data setup time
Data valid time
t
VD;DAT (II)
0.9
Data hold time
tHD;DAT
tSU;STA
tHD;STA
tSU;STO
tBUF
0
Repeated start setup time
Start condition hold time
Stop condition setup time
Bus free time between stop and start
0.6
0.6
0.6
1.3
Up to 0.3xVDD from GND, down
to 0.7xVDD from VDD
Input glitch suppression
tSP
50
ns
Table 6 I2C Timing Specification
Notes:
(i) All timing specifications, Figure 7 and Figure 8, refer to voltage levels (VIL, VIH, VOL) defined in Table 5.
(ii) tVD;DAT = Minimum time for SDA data out to be valid following SCL LOW.
The interface complies with slave F/S mode as described by NXP: “I2C-bus specification, Rev. 03 - 19 June 2007”
Figure 7 I2C Start and Stop timing
Figure 8 I2C Data timing
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8 Capacitive Buttons, LEDs and
Proximity Controller with Analog Outputs
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DATASHEET
3
F
UNCTIONAL DESCRIPTION
Introduction
3.1
3.1.1 General
The SX9512/12B/13/13B is intended to be used in applications which require capacitive sensors covered by
isolating overlay material and which may need to detect the proximity of a finger/hand though the air. The
SX9512/12B/13/13B measures the change of charge and converts that into digital values. The larger the charge
on the sensors, the larger the number of digital value will be. The charge to digital value conversion is done by the
SX9512/12B/13/13B Analog Sensor Interface (ASI).
The digital values are further processed by the SX9512/12B/13/13B and converted in a high level, easy to use
information for the user’s host.
The information between SX9512/12B/13/13B and the user’s host is passed through the I2C interface with an
additional interrupt signal indicating that the SX9512/12B/13/13B has new information. For buttons this
information is simply touched or released. The SX9512/12B/13/13B can operate without the I2C and interrupt by
using the analog output interface (SPO1, SPO2) with a changing voltage level to indicate the button touched.
3.1.2 Feedback
Visual feedback to the user is done by the button and LED pins BL[7...0]. The LED drivers will fade-in when a
finger touches a button or proximity is detected and fade-out when the button is released or finger goes out of
proximity. Fading intensity variations can be logarithmic or linear. Interval speed and initial and final light intensity
can be selected by the user.
Audible feedback can be obtained through the Special Purpose Output (SPO2) pin connected to a buzzer.
3.1.3 Analog Output Interface SPO1 and SPO2
The Analog Output Interface (AOI) is a Digital signal driven from GND to SVDD and controlled by a PWM. When
the digital signal on the SPO line is filtered with an RC low pass filter you produce a DC voltage, the level of which
depends on the buttons that has been touched. A host controller can then measure the voltage delivered by the
SPO output and determine which button is touched at any given time.
The AOI feature allows the SX9512/12B/13/13B device to directly replace legacy mechanical button controllers in
a quick and effortless manner. The SX9512/12B/13/13B supports up to two Analog Output Interfaces, on SPO1
and SPO2 respectively. The SX9512/12B/13/13B allows buttons to be mapped on either SPO1 or SPO2. The
button mapping as well as the mean voltage level that each button produces on an SPO output can be configured
by the user through a set of parameters described in later chapters.
3.1.4 Buzzer
The SX9512/12B/13/13B can drive a buzzer (on SPO2) to provide audible feedback on button touches. The
buzzer provides two phases, each of which can vary from 5ms to 30ms in length and can drive 1KHz, 2KHz, 4KHz
or 8KHz tones.
3.1.5 Configuration
The control and configuration registers can be read from and written to an infinite number of times. During the
development phase the parameters can be determined and fine tuned by the users and updated over the I2C.
Once the parameter set has been determined, the settings can be downloaded over the I2C by the host each time
the SX9512/12B/13/13B boots up or they can be stored in the Multiple Time Programmable (MTP) Non Volatile
Memory (NVM) on the SX9512/12B/13/13B. This allows the flexibility of dynamically setting the parameters at the
expense of I2C traffic or autonomous operation without host intervention.
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8 Capacitive Buttons, LEDs and
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After the parameters are written to the NVM, the registers can still be dynamically overwritten in whole or in part
by the host when desired.
3.2
Scan Period
The SX9512/12B/13/13B interleaves the sensing of the touch buttons with the driving of the LEDs. To keep the
LED intensities constant and flicker free the BL sensing is done in a round robin fashion with an LED drive period
between each of the BL sensing periods.
Figure 9 CapSense Scan Frame SX9512/12B/13/13B
To keep timing consistency the scan frame always cycles through all channels (BL0 to BL7) and Combined
Channel proximity even if a channel is disabled or a device does not have the proximity feature. This means that
the frame time is always the sum of nine CapSense measurement times and nine LED PWM times.
The SX9512/12B/13/13B can reduce it’s average power consumption by inserting fames that skip the CapSense
measurements but maintain the LED PWM timing.
The Scan period of the SX9512/12B/13/13B is the time between the measurement of a particular channel and its
next measurement. This period is the time for one CapSense frame plus the time for any skip frames and is the
key factor in determining system touch response timing.
Figure 10 shows the different SX9512/12B/13/13B periods over time.
Figure 10 Scan Period SX9512/12B/13/13B
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8 Capacitive Buttons, LEDs and
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3.3
Operation modes
The SX9512/12B/13/13B has 2 operation modes, Active and Sleep. The main difference between the 2 modes is
found in the reaction time (corresponding to the scan period) and power consumption.
Active mode offers fast scan periods. The typical reaction time is 40ms. All enabled sensors are scanned and
information data is processed within this interval.
Sleep mode increases the scan period time which increases the reaction time to 200ms typical and at the same
time reduces the operating current.
The user can specify other scan periods for the Active and Sleep mode and decide for other compromises
between reaction time and power consumption.
In most applications the reaction time needs to be fast when fingers are present, but can be slow when no person
uses the application. In case the SX9512/12B/13/13B is not used during a scan frame it will go from Active mode
into Sleep mode and power will be saved. (when sleep mode is enabled)
To leave Sleep mode and enter Active mode this can be done by a touch on any button or the detection of
proximity.
The host can decide to force the operating mode by issuing commands over the I2C (using register 0x3A[3]) and
take fully control of the SX9512/12B/13/13B. The diagram in Figure 11 shows the available operation modes and
the possible transitions.
Power On
ACTIVE mode
I2Ccmd
OR proximity
OR touch any button
passive
timeout
SLEEP mode
Figure 11 Operation modes
3.4
Sensors on the PCB
The capacitive sensors are relatively simple copper areas on the PCB connected to the eight SX9512/12B/13/13B
capacitive sensor input pins (BL0…BL7). The sensors are covered by isolating overlay material (typically
1mm...3mm). The area of a sensor is typically one square centimeter which corresponds to about the area of a
finger touching the overlay material. The area of a proximity sensor is usually significantly larger than the smaller
touch sensors.
The SX9512/12B and the SX9513/13B capacitive sensors can be setup as ON/OFF buttons for control
applications (see example Figure 12).
Figure 12 PCB top layer of touch buttons sensors surrounded by the shield, SX9512/12B/13/13B
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8 Capacitive Buttons, LEDs and
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The SX9512/12B offers 2 options for proximity detection. Depending on the PCB area, the proximity detection
distance can be optimized.
1) Individual Sensor Proximity
Single sensor proximity is done by replacing the shield area shown in Figure 10 with a connection to BL0 as
shown in Figure 24.
Figure 13 PCB top layer for proximity and touch buttons, SX9512/12B
2) Combined Channel Proximity
In Combined Channel Proximity the SX9512/12B will put some or all of the sensors in parallel and execute one
sensing cycle on this combined large sensor.
3.5
Button Information
The touch buttons have two simple states (see Figure 14): ON (touched by finger) and OFF (released and no
finger press).
Figure 14 Buttons
A finger is detected as soon as the digital values from the ASI reach a user-defined threshold plus a hysteresis.
A release is detected if the digital values from the ASI go below the threshold minus a hysteresis. The hysteresis
around the threshold avoids rapid touch and release signaling during transients.
Buttons can also be used to do proximity sensing. The principle of proximity sensing operation is exactly the same
as for touch buttons except that proximity sensing is done several centimeters above the overlay through the air.
ON state means that finger/hand is detected by the sensor and OFF state means the finger/hand is far from the
sensor and not detected.
Figure 15 Proximity
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3.6
Buzzer
The SX9512/12B/13/13B has the ability to drive a buzzer (on SPO2) to provide an audible indication that a button
has been touched. The buzzer is driven by a square wave signal for approximately 10ms (default). During both
the first phase (5ms) and the second phase (5ms) the signal’s frequency is default 1KHz.
The buzzer is activated only once during any button touch and is not repeated for long touches. The user can
choose to enable or disable the buzzer by configuration and define the idle level, frequencies and phase durations
(see §4.6).
Figure 16 Buzzer behavior
3.7
Analog Output Interface
The Analog Output Interface outputs a PWM signal with a varying duty cycle depending on which button is
touched. By filtering (with a simple RC filter) the PWM signal results in a DC voltage that is different for each
button touch. The host controller measures the DC voltage level and determines which buttons has been touched.
In the case of single button touches, each button produces its own voltage level as configured by the user.
Figure 17 show how the AOI will behave when the user touches and releases different buttons.
The AOI will switch between the AOI idle level and the level for each button.
Figure 17 AOI behavior
The PWM Blocks used in AOI modes are 6-bits based and are typically clocked at 2MHz.
Figure 18 shows the PWM definition of the AOI.
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Figure 18 PWM definition, (a) small pulse width, (b) large pulse width
The AOI always reports one button per output channel. The AOI can be split over SPO1 and SPO2 (AOI-A, AOI-
B. The user can map any button to either AOI-A or AOI-B or both.
In most applications only one AOI pin will be selected. The two AOI pins allow the user to use a more coarse
detection circuit at the host. Assuming a 3.3V supply and 8 buttons on one single AOI then the AOI levels could
be separated by around 0.3…0.4V. In the case of using the two AOI pins, 4 buttons could be mapped on AOI-A
separated by around 0.8V (similar for 4 buttons on AOI-B) which is about double that of the case of a single AOI.
In the case of a single touch the button reporting is straight forward (as in Figure 17). If more than one button is
touched the reported depends on the selected button reporting mode parameter (see yyy). Three reporting modes
exist for the SX9512/12B/13/13B (All, Single and Strongest).
The All reporting mode is applicable only for the I2C reporting (AOI is not available). In All-mode all buttons that
are touched are reported in the I2C buttons status bits and on the LEDs. In the Single-mode a single touched
button will be reported on the AOI and the I2C. All touches that occur afterwards will not be reported as long as
the first touch sustains. Only when the first reported button is released will the SX9512/12B/13/13B report another
touch.
Figure 19 shows the Single-mode reporting in case of 2 touches occurring over time.
Figure 19 Single-mode reporting with 2 touches
At time t1 button0 is touched and reported on the AOI. At time t2 button1 is touched as well but not reported. At
time t3 the button0 is released and button1 will be reported immediately (or after one scan period at idle level). At
time t4 both buttons are released and the AOI reports the idle level.
The button with the lowest Cap pin index will be reported in case of a simultaneous touch (that means touches
occurring within the same scan period).
In the Strongest-mode the strongest touched button will be reported on the AOI and the I2C. All touches that
occur afterwards representing a weaker touch will not be reported. Only a touch which is stronger will be reported
by the SX9512/12B/13/13B.
Figure 20 shows the Strongest-mode reporting in case of 2 touches (with bt1 the strongest touch).
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Figure 20 Strongest-mode reporting with 2 touches
At time t1 button0 is touched and reported on the AOI. At time t2 button1 is touched as well. As bt1 is the
strongest touch it will be reported on the AOI immediately (or after one scan period at idle level). At time t3 the
button0 is released while the AOI continues to report button1. At time t4 both buttons are released and the AOI
reports the idle level.
3.8
Analog Sensing Interface
The Analog Sensing Interface (ASI) induces a charge on the sensors and then converts the charge into a digital
value which is further digitally processed. The basic principle of the ASI will be explained in this section.
The ASI consists of a multiplexer selecting the sensor, analog switches, a reference voltage, a high-resolution
ADC converter and an offset compensation DAC (see Figure 21).
Figure 21 Analog Sensor Interface
The SX9512/12B offers the additional Combined Channel Proximity mode where all sensors are sensed in
parallel.
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Figure 22 Analog Sensor Interface for SX9512/12B, Combined Channel Prox Mode
To get the digital value representing the charge on a specific sensor the ASI will execute several steps. A voltage
will be induced on the sensor developing a charge relative to the absolute capacitance of the sensor. The charge
on a sensor cap (e.g BL0) will then be accumulated multiple times on the internal integration capacitor (Cint). This
results in an increasing voltage on Cint proportional to the capacitance on BL0.
At this stage the offset compensation DAC is enabled. The compensation DAC generates a voltage proportional
to an estimation of the external parasitic capacitance (the capacitance of the system without the calibration).
The difference between the DAC output and the charge on Cint is the desired signal. In the ideal case the
difference of charge will be converted to a zero digital value if no finger is present and the digital value becomes
high in case a finger is present.
The difference of charge on Cint and the DAC output will be transferred to the ADC.
After the charge transfer to the ADC the steps above will be repeated.
The SX9512/12B/13/13B allows setting the sensitivity for each sensor individually for applications which have a
variety of sensors sizes or different overlays or for fine-tuning performances. The optimal sensitivity depends
heavily on the final application. If the sensitivity is too low the digital value will not pass the thresholds and
touch/proximity detection will not be possible. In case the sensitivity is set too large, some power will be wasted
and false touch/proximity information may be output (i.e. for touch buttons => finger not touching yet, for proximity
sensors => finger/hand not close enough).
The digital values from the ASI will then be handled by the digital processing.
The ASI will shut down and wait until new sensing period will start.
3.8.1 Processing
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ASI
processing
processing
raw
useful
diff
low pass
low pass
ave
compensation DCV
Figure 23 Processing
The raw data is processed through a programmable low pass filter to create useful data (data with fast
environmental noise suppressed). The useful data is processed through a second programmable low pass filter
(with a longer time constant) to create average data. The average data tracks along with the slow environmental
changes and is subtracted from the useful data to create the diff data. The diff data represents any fast
capacitance changes such as a touch or proximity event.
3.8.2 Offset Compensation
The parasitic capacitance at the BL pins is defined as the intrinsic capacitance of the integrated circuit, the PCB
traces, ground coupling and the sensor planes. This parasitic capacitance is relatively large (tens of pF) and will
also vary slowly over time due to environmental changes.
A finger touch is in the order of one pF and its effect typically occurs much faster than the environmental changes.
The ASI has the difficult task of detecting a small, fast changing capacitance that is riding on a large, slow varying
capacitance. This would require a very precise, high resolution ADC and complicated, power consuming, digital
processing.
The SX9512/12B/13/13B features a 16 bit DAC which compensates for the large, slow varying capacitance
already in front of the ADC. In other words the ADC converts only the desired small signal. In the ideal world the
ADC will put out a zero digital value even if the external capacitance is as high as 40pF.
At each power-up of the SX9512/12B/13/13B the Compensation Values are estimated by the digital processing
algorithms. The algorithm will adjust the compensation values such that a near-zero value will be generated by the
ADC. Once the correct compensation values are found these will be stored and used to compensate each BL pin.
If the SX9512/12B/13/13B is shut down the compensation values will be lost. At a next power-up the procedure
starts all over again. This assures that the SX9512/12B/13/13B will operate under any condition.
However if temperature changes this will influence the external capacitance. The ADC digital values will drift then
slowly around zero values basically because of the mismatch of the compensation circuitry and the external
capacitance.
In case the average value of the digital values become higher than the positive calibration threshold (configurable
by user) or lower than the negative threshold (configurable by user) then the SX9512/12B/13/13B will initiate a
compensation procedure and find a new set of compensation values.
The host can initiate a compensation procedure by using the I2C interface. This is required after the host changes
the sensitivity of sensors.
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3.9
Configuration
Figure 24 shows the building Blocks used for configuring the SX9512/12B/13/13B.
Figure 24 Configuration
During development of a touch system the register settings for the SX9512/12B/13/13B are adjusted until the user
is satisfied with the system operation. When the adjustments are finalized contents of the registers can be stored
in the Multiple Time Programmable (MTP) Non Volatile Memory (NVM). The NVM contains all those parameters
that are defined and stable for the application. Examples are the number of sensors enabled, sensitivity, active
and Sleep scan period. The details of these parameters are described in the next chapters.
At power up or reset the SX9512/12B/13/13B copies the settings from the NVM into the registers.
3.10 Clock Circuitry
The SX9512/12B/13/13B has its own internal clock generation circuitry that does not require any external
components. The clock circuitry is optimized for low power operation.
3.11 I2C interface
The host will interface with the SX9512/12B/13/13B through the I2C bus and the analog output interface.
The I2C of the SX9512/12B/13/13B consists of 95 registers. Some of these I2C registers are used to read the
status and information of the buttons. Other I2C registers allow the host to take control of the
SX9512/12B/13/13B.
The I2C slave implemented on the SX9512/12B/13/13B is compliant with the standard (100kb/s) and fast mode
(400kb/s)
The default SX9512/12B/13/13B I2C address equals 0b010 1011.
3.12 Interrupt
The NIRQ mode of SPO2 has two main functions, the power up sequence and maskable interrupts (detailed
below).
3.12.1 Power up
During power up the NIRQ is kept low (if SPO2 is configured for NIRQ in the NVM). Once the power up sequence
is terminated the NIRQ is cleared autonomously. The SX9512/12B/13/13B is then ready for operation. The AOI
levels are updated at the latest one scan period after the rising edge of NIRQ.
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Figure 25 Power Up vs. NIRQ
During the power on period the SX9512/12B/13/13B stabilizes the internal regulators, RC clocks and the firmware
initializes all registers.
During the power up the SX9512/12B/13/13B is not accessible and I2C communications are forbidden. The value
of NIRQ before power up depends on the NIRQ pull up resistor to the SVDD supply voltage.
3.12.2 NIRQ Assertion
When the NIRQ function is enabled for SPO2 then NIRQ is updated in Active or Sleep mode once every scan
period.
The NIRQ will be asserted at the following events:
•
•
•
•
if a Button event occurred (touch or release if enabled)
a proximity even occurred (prox or loss of prox (SX9512/12B only))
once compensation procedure is completed either through automatic trigger or via host request
during reset (power up, hardware NRST, software reset)
3.12.3 Clearing
The clearing of the NIRQ is done as soon as the host performs a read to any of the SX9512/12B/13/13B I2C
registers.
3.12.4 Example
A typical example of the assertion and clearing of the NIRQ and the I2C communication is shown in Figure 26.
Figure 26 Interrupt and I2C
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When a button is touched the SX9512/12B/13/13B will assert the interrupt (1). The host will read the
SX9512/12B/13/13B status information over the I2C (2) and this clears the interrupt.
If the finger releases the button the interrupt will be asserted (3), the host reads the status (4) which clears the
interrupt.
In case the host will not react to an interrupt then this will result in a missing touch.
3.13 Reset
The reset can be performed by 3 sources:
- power up,
- NRST pin,
- software reset.
3.13.1 Power up
During power up the NIRQ is kept low (if SPO2 is configured for NIRQ in the NVM). Once the power up sequence
is terminated the NIRQ is cleared autonomously. The SX9512/12B/13/13B is then ready for operation. The AOI
levels are updated at the latest one scan period after the rising edge of NIRQ.
Figure 27 Power Up vs. NIRQ
During the power on period the SX9512/12B/13/13B stabilizes the internal regulators, RC clocks and the firmware
initializes all registers.
During the power up the SX9512/12B/13/13B is not accessible and I2C communications are forbidden.
As soon as the NIRQ rises the SX9512/12B/13/13B will be ready for I2C communication.
3.13.2 NRST
When NRST is driven low the SX9512/12B/13/13B will reset and start the power up sequence as soon as NRST
is driven high or pulled high.
In case the user does not require a hardware reset control pin then the NRST pin can be connected to SVDD.
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Figure 28 Hardware Reset
3.13.3 Software Reset
To perform a software reset the host needs to write 0xDE at the SoftReset register at address 0xFF.
Figure 29 Software Reset
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3.14 LEDS on BL
The SX9512/12B/13/13B offers eight BL pins that both detect the capacitance change on the touch/prox sensor
and drive the associated LED.
The polarity of the BL pins is defined as in the figure below.
Figure 30 LED between BL and LS pins
The PWM Blocks used in BLP and LED modes are 8-bits based and clocked at 2MHz typ. hence offering 256
selectable pulse width values with a granularity of 0.5us typ.
Figure 31 PWM definition, (a) small pulse width, (b) large pulse width
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LED Fading
The SX9512/12B/13/13B supports two different fading modes, namely Single and Continuous. These fading
modes can be configured for each GPIO individually. Please see “BL Parameters” for more information on how to
configure this feature.
i) Single Fading Mode:
The LED pin fades in when the associated button is touched and it fades out when it is released. This is shown in
Figure 32
OFF
ON
OFF
ON intensity
OFF intensity
OFF intensity
fading-in
delay_off fading-out
Figure 32 Single Fading Mode
ii) Continuous Fading Mode:
The LED in and fades out continuously when the associated button is touched. The fading in and out stops when
the button is released. This is shown in Figure 33.
OFF
ON
ON intensity
OFF intensity
OFF intensity
fading-in fading-out
Figure 33 Continuous Fading Mode
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3.14.1 Intensity index vs. PWM pulse width
Tables below show the PWM pulse width for a given intensity (n) setting (for both linear and log modes).
Lin/
Log
0/0
2/0
3/0
4/0
5/0
6/2
7/2
Lin/
Log
Lin/
Log
Lin/
Log
97/26
98/27
Lin/
Log
Lin/
Log
Lin/
Log
Lin/
Log
n
n
n
n
n
n
n
n
0
1
2
3
4
5
6
7
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
33/5
34/5
35/5
36/5
37/5
38/6
39/6
40/6
41/6
42/6
43/7
44/7
45/7
46/7
47/7
48/8
49/8
50/8
51/8
52/9
53/9
54/9
55/9
56/10
57/10
58/10
59/10
60/11
61/11
62/11
63/12
64/12
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
65/12
66/13
67/13
68/13
69/14
70/14
71/14
72/15
73/15
74/15
75/16
76/16
77/16
78/17
79/17
80/18
81/18
82/19
83/19
84/20
85/20
86/21
87/21
88/22
89/22
90/23
91/23
92/24
93/24
94/25
95/25
96/26
96
97
98
99
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
129/48
130/49
131/50
132/51
133/52
134/53
135/54
136/55
137/55
138/56
139/57
140/58
141/59
142/60
143/61
144/62
145/63
146/64
147/65
148/66
149/67
150/68
151/69
152/71
153/72
154/73
155/74
156/75
157/76
158/77
159/78
160/80
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
161/81
162/82
163/83
164/84
165/86
166/87
167/88
168/89
169/91
170/92
171/93
172/95
173/96
174/97
175/99
176/100
177/101
178/103
179/104
180/106
181/107
182/109
183/110
184/111
185/113
186/114
187/116
188/117
189/119
190/121
191/122
192/124
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
193/125
194/127
195/129
196/130
197/132
198/133
199/135
200/137
201/139
202/140
203/142
204/144
205/146
206/147
207/149
208/151
209/153
210/155
211/156
212/158
213/160
214/162
215/164
216/166
217/168
218/170
219/172
220/174
221/176
222/178
223/180
224/182
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
225/184
226/186
227/188
228/190
229/192
230/194
231/197
232/199
233/201
234/203
235/205
236/208
237/210
238/212
239/215
240/217
241/219
242/221
243/224
244/226
245/229
246/231
247/233
248/236
249/238
250/241
251/243
252/246
253/248
254/251
255/253
256/256
99/27
100/28
101/29
102/29
103/30
104/30
105/31
106/32
107/32
108/33
109/33
110/34
111/35
112/35
113/36
114/37
115/38
116/38
117/39
118/40
119/40
120/41
121/42
122/43
123/44
124/44
125/45
126/46
127/47
128/48
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
8/2
9/2
8
9
10/2
11/2
12/2
13/2
14/2
15/3
16/3
17/3
18/3
19/3
20/3
21/3
22/3
23/3
24/4
25/4
26/4
27/4
28/4
29/4
30/4
31/4
32/5
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Table 7 Intensity index vs. PWM pulse width (normal polarity)
Recommended/default settings are inverted polarity (to take advantage from high sink current capability) and
logarithmic mode (due to the non-linear response of the human eye).
3.14.2 LED Triple Reporting
The button information touch and release can be reported on the LEDs in dual mode (ON and OFF).
The proximity information can be shown using the dual mode by attributing a dedicated LED to the proximity
sensor. The LED will show then proximity detected or no proximity detected. The fading principles are equal to the
fading of sensors defined as buttons as described in the previous sections.
In triple mode proximity is reported on all LEDs by an intermediate LED intensity.
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Figure 34 LEDs in triple reporting mode proximity
Figure 34 shows an example of proximity detection and the reporting on LEDs. As soon as proximity is detected
all LEDs (2 LEDs are shown for simplicity) will fade in and stop at the proximity intensity level. In case proximity is
not detected anymore then the LEDs remain at the proximity intensity for a configurable time and then the fading
out will start.
Figure 35 LEDs in triple reporting mode proximity and touch
Figure 35 shows an example of proximity detection followed by a rapid touch on the sensor sd1.
The LEDs d1 and d2 will fade in as soon as proximity is detected (using the Inc_Prox parameter).
As soon as the finger touches the sensor sd1 the fading in of d1 will go to the ON intensity (using the touch
increment parameter).
The LED d2 remains at the proximity intensity level as sensors sd2 is not touched.
If the finger is removed rapidly the fading out of d1 will first use the touch decrement parameter to the proximity
intensity level. If the finger leaves the proximity region d1 and 2 will fade out simultaneously using the proximity
delay and decrement parameters.
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4
D
ETAILED
CONFIGURATION DESCRIPTIONS
4.1
Introduction
The SX9512/12B/13/13B configuration parameters are taken from the NVM and loaded into the registers at
Power-Up or upon reset.
The registers are split by functionality into configuration sections:
•
•
•
•
•
•
General section: operating modes,
Capacitive Sensors section: related to lower level capacitive sensing,
LED
Special Purpose Outputs
Buzzer
System (Reserved)
The address space is divided up into areas that are (can be) stored in NVM and areas that are dynamic and not
stored.
Within the register address space are values designated as ‘Reserved’. These values can be disregarded when
reading but bust be set to the specified values when writing.
Address
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
Name
Address
0x38
0x39
0x3A
0x3B
0x3C
0x3D
0x3E
0x3F
0x40
0x41
0x42
0x43
0x44
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
0x4D
0x4E
0x4F
0x50
Name
IrqSrc
CapSenseStuck
CapSenseFrameSkip
CapSenseMisc
ProxCombChanMask
Reserved
TouchStatus
ProxStatus
CompStatus
NVMCtrl
Reserved
Reserved
Spo2Mode
PwrKey
Reserved
SPOChanMap
SPOLevelBL0
SPOLevelBL1
SPOLevelBL2
SPOLevelBL3
SPOLevelBL4
SPOLevelBL5
SPOLevelBL6
SPOLevelBL7
SPOLevelIdle
SPOLevelProx
Reserved
IrqMask
Reserved
Reserved
LEDMap1
LEDMap2
LEDPwmFreq
LEDMode
LEDIdle
LEDOffDelay
LED1On
Reserved
LED1Fade
LED2On
BuzzerTrigger
BuzzerFreq
LED2Fade
LEDPwrIdle
LEDPwrOn
LEDPwrOff
Reserved
Reserved
Reserved
Reserved
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0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
LEDPwrFade
0x51
0x52
0x53
0x54
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
0x5C
0x5D
0x5E
0x5F
0x60
0x61
0x62
0x63
0x64
0x65
0x66
0x67
0x68
0x69
0x6A
0x6B
0x6C
…
Reserved
LEDPwrOnPw
Reserved
LEDPwrMode
Reserved
Reserved
Reserved
Reserved
Reserved
CapSenseEnable
CapSensRange0
CapSenseRange1
CapSenseRange2
CapSenseRange3
CapSenseRange4
CapSenseRange5
CapSenseRange6
CapSenseRange7
CapSenseRangeAll
CapSenseThresh0
CapSenseThresh1
CapSenseThresh2
CapSenseThresh3
CapSenseThresh4
CapSenseThresh5
CapSenseThresh6
CapSenseThresh7
CapSenseThreshComb
CapSenseOp
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
CapSenseChanSelect
CapSenseUsefulDataMsb
CapSenseUsefulDataLsb
CapSenseAverageDataMsb
CapSenseAverageDataLsb
CapSenseDiffDataMsb
CapSenseDiffDataLsb
CapSenseCompMsb
CapSenseCompLsb
Reserved
CapSenseMode
CapSenseDebounce
CapSenseNegCompThresh
CapSensePosCompThresh
CapSensePosFilt
CapSenseNegFilt
0xFE
0xFF
Reserved
I2CSoftReset
Table 8 Register Map
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4.2
General Control and Status
4.2.1 Interrupt Source
Address Name Acc Bits Field
Function
0x00
IrqSrc R/W 7:0
Irq
Source
Indicate active Irqs
0 : Irq inactive
1 : Irq active
Bit map
7 : Reset
6 : Touch
5 : Release
4 : Near (Prox on)
3 : Far (Prox off)
2 : Compensation done (Write a 1 to this bit to trigger a
compensation on all channels)
1 : Conversion done.
0 : Reserved, will read 0
The Irq Source register will indicate that the specified event has occurred since the last read of this register. If the
NIRQ function is selected for SPO2 then it will indicate the occurrence of any of these events that are not masked
out in register 0x09.
The Irq mask in register 0x09 will prevent an Irq from being indicated by the NIRQ pin but it will not prevent the
IRQ from being noted in this register.
4.2.2 Touch Status
Address Name
0x01 TouchStatus
Acc Bits Field
7:0 Touch Status
Function
R
Indicates touch detected on indicated BL channel.
Bit 7 = BL7 … Bit 0 = BL0
0 : No touch detected
1 : Touch detected
The Touch Status register will indicate when a touch occurs on one of the BL channels. A touch is indicated when
a channels DiffData value goes at least the Hyst value above its threshold level for debounce number of
consecutive measurement cycles. A touch is lost when a channels DiffData value goes at least Hyst value below
it’s threshold for debounce number of measurement cycles. This is a dynamic read only regester that is not stored
in NVM.
Example: BL2 is set to a threshold of 400 (0x21 = 0x19), a Hyst of 8 (0x37 [7:5] = 3’b001), a touch debounce of 0
(0x33 [3:2] = 2’b00) and a release debounce of 2 (0x33 [1:0] = 2’b01).
A touch will be indicated the first measurement cycle that the DiffData goes above 408 and the touch will be lost
when the DiffData value goes below 392 on two successive measurement cycles.
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4.2.3 Proximity Status
Address Name
0x02 ProxStatus
Acc Bits Field
Function
Indicates proximity detected on BL0
0 : No Proximity detected
R
7
ProxBL0
1 : Proximity detected
(if Prox on BL0 enabled (0x31[6]))
R
6
ProxMulti
Indicates proximity detected on combined channels
0 : No Proximity detected
1 : Proximity detected
(if Prox on combined channels enabled (0x31[5])
and channels enabled for use (0x3B))
Indicates compensation pending for combined
channel Prox sensing
0 : Compensation not pending
1 : Compensation pending
(if Prox on combined channels enabled (0x31[5])
and channels enabled for use (0x3B))
Reserved, will read 00000
R
R
5
ProxMulti Comp
Pending
4:0
Reserved
The ProxBL0 bit will indicate Proximity detected on the BL0 pin, The ProxMulti bit will indicate proximity on the
Combined Channels and the ProxMulti Comp Pending bit will indicate that a compensation has been requested
for the Combined Channels and is pending. (for SX9512/12B and if enabled),
4.2.4 Compensation Status
Address Name
0x03 CompStatus
Acc Bits Field
Function
R
7:0
Comp
Pending
Indicates compensation pending on indicated BL channel.
Bit 7 = BL7 … Bit 0 = BL0
0 : Compensation not pending
1 : Compensation pending
The Comp Pending register indicates which pins from BL0 to BL7 have compensations requested and pending.
4.2.5 NVM Control
Address Name
0x04 NVMCtrl
Acc Bits Field
R/W 7:4 NVM Burn
Function
Write 0x50 followed by 0xA0 to initiate transfer of
reg 0x07 through 0x62 to NVM
Trigger NVM read.
R/W
3
NVM Read
0 : Do nothing
1 : Read contents of current active NVM area into
registers
R
2:0
NVM Area
Indicates current active NVM area
000 : no areas are programmed.
001 : User1 area is programmed and in use.
011 : User2 area is programmed and in use.
111 : User3 area is Programmed and in use.
The NVM Area field indicates which of the user NVM areas are currently programmed and active (1, 2 or 3). The
NVM Read bit gives the ability to manually request that the contents of the NVM be transferred to the registers
and NVM Burn field gives the ability to burn the current registers to the next available NVM area.
Normally, the transfer of data from the NVM to the registers is done automatically on power up and upon a reset
but occasionally a user might want to force a read manually.
Registers 0x07 through 0x62 are stored to NVM and loaded from NVM.
After writing 0xA0 (ie NVM burn), wait for at least 500ms and then power off-on the IC for changes to be effective.
Caution, there are only three user areas and attempts to burn values beyond user area 3 will be ignored.
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4.2.6 SPO2 Mode Control
Address Name
Acc Bits Field
Function
0x07 Spo2Mode R/W
7
Reserved
Reserved, set to 0
R/W 6:5
SPO2 Config Set function of SPO2 pin
00 : Pin is open drain NIRQ
01 : Pin drives Buzzer (see registers 0x4B and 0x4C)
10 : Pin is Analog Output 2
11 : TV Power State input (see registers 0x07[4] and
0x1B[7])
R/W
4
TV Power
State
If SPO2 set to TV Power State input then TV power state
indicated by this bit,
if SPO2 set to other function then Host writes this bit to
indicate current TV Power State.
0 : Off
1 : On
R/W 3:0
Reserved
Reserved, set to 0000
The SPO2 Config field will specify the functionality of the SPO pin. When selected as NIRQ, the open drain output
will go low whenever a non-masked Irq occurs and the NIRQ will go back high after a register 0x00 is read over
the I2C. When selected as Buzzer, the SPO2 pin will drive a 2 phase 2 frequency signal onto an external buzzer
for each specified event (see Buzzer section). When selected as SPO2, pin operates as an analog output similar
to SPO1 (see SPO section). If selected as TV power state, the pin is driven from the system PMIC with a high
(SPO2 = SVDD) indicating that the system power is on and a low (SPO2 = GND) when the system power is off.
The TV Power State bit reads back the current state of SPO2 if SPO2 is selected for TV power state, otherwise
the system should write to this bit to indicate the current system power state. The SX9512/12B/13/13B needs to
know the current state in able to correctly process some of the LED modes for the Power Button (see LED
modes).
4.2.7 Power Key Control (for generation of PWRON signal)
Address Name
0x08 PwrKey
Acc Bits Field
R/W 7:0 Power Keys
Function
Set which BL sensors will trigger a PowerOn pulse
when touched.
Bit 7 = BL7 … Bit 0 = BL0
0 : Do not use channel
1 : Use channel
If BL7 is enabled (0x1B[1]), it will be the main power
button with respect to power button LED functions
(see reg 0x16 through 0x1B)
The Power Keys field is a map that indicates which of the BL0 through BL7 channels should trigger a pulse on the
PWRON pin when touched. This should not be confused with the BL7 Power Key enable bit as described in
register 0x1B.
4.2.8 Interrupt Request Mask
Address Name
0x09 IrqMask
Acc Bits Field
R/W 7:0 Irq Mask
Function
Set which Irqs will be trigger an NIRQ (if enabled on
SPO2) and report in reg 0x00
0 : Disable Irq
1 : Enable Irq
Bit map
7 : Reset
6 : Touch
5 : Release
4 : Near (Prox on)
3 : Far (Prox off)
2 : Compensation done
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1 : Reserved, set to 0
0 : Reserved, set to 0
The Irq Mask field determines which Irq events will trigger an NIRQ signal on SPO2 if SPO2 is set to the NIRQ
function.
4.2.9 I2C Soft Reset
Address
Name
Acc
Bits
Field
Function
0xFF
I2CSoftReset
W
7:0
I2C Soft Reset
Write 0xDE followed by 0x00 to
reset
Trigger a device reset and NVM re-load by writing 0xDE followed by 0x00 to this register.
4.3
LED Control
4.3.1 LED Map for Engine 1 and 2
Address
Name
Acc Bits Field
Function
0x0C
LEDMap1
R/W 7:0
LED Engine
Map 1
Assign indicated BL channel to LED engine 1
Bit 7 = BL7 … Bit 0 = BL0
0 : Do not assign to LED engine 1
1 : Assign to LED engine 1
0x0D
LEDMap2
R/W 7:0
LED Engine
Map 2
Assign indicated BL channel to LED engine 2
Bit 7 = BL7 … Bit 0 = BL0
0 : Do not assign to LED engine 2
1 : Assign to LED engine 2
Write a 1 for each bit (7 through 0) into the LED Engine Map 1 field for each channel (BL7 through BL0) that will
be driven by LED Engine 1.
Write a 1 for each bit (7 through 0) into the LED Engine Map 2 field for each channel (BL7 through BL0) that will
be driven by LED Engine 2.
In most cases each BL channel will only be assigned to one of the engines but there are some rare cases where a
channel will be assigned to both.
4.3.2 LED PWM Frequency
Address
0x0E
Name
LEDPwmFreq
Acc
R/W 7:0
Bits Field
LED PWM Frequency
Function
LEDPWMfreq = 2MHz / n
The LED PWM frequency is derived from the 2MHz oscillator and is the primary method for controlling the BL7
through BL0 frame scanning rate as well as impacting the maximum brightness achievable on each LED and
impacting the smoothness of the LED illumination (flicker prevention).
As displayed in Figure 6, the CapSense measurements and LED PWM drive is time multiplexed. The CapSense
measurement time is nominally 648us and the LED PWM time is 255 LED clocks long. The LED refresh frequency
must be above 50/60Hz to ensure that there is not a noticeable flicker on the LEDs. So we have:
LED max brightness = 255/(648us * LEDPwmFreq + 255)
LED refresh frequency = 1 / (648us + 255/LEDPwmFreq)
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4.3.3 LED Mode
Address Name
Acc Bits Field
R/W 7:4 LED Fade Repeat
Function
0x0F
LEDMode
Set number of fade in/out repeats when in LED
Repeat X low and Repeat X high modes (see
reg 0x0F[1:0])
R/W
R/W
3
2
Reserved
LED Fading
Reserved, set to 0
Set LED fade in and fade out type
0 : linear
1 : log
R/W 1:0
LED Mode
Set LED mode of operation
00 : Single shot
01 : Repeat continuous
10 : Repeat X low
11 : Repeat X high
4.3.4 LED Idle Level
Address Name
Acc Bits Field
Function
0x10
LEDIdle
R/W 7:0
LED Engine 1 & 2 Idle
Level
Set LED engine 1 and LED engine 2 idle
intensity level.
4.3.5 LED Off Delay
Address Name
Acc Bits Field
Function
0x11
LEDOffDelay R/W 7:4
LED Engine 1 Delay Off Set time delay from loss of touch/prox to start
Time
of fade out.
Delay = n * 256ms
R/W 3:0
LED Engine 2 Delay Off Set time delay from loss of touch/prox to start
Time
of fade out.
Delay = n * 256ms
4.3.6 LED Engine 1 On Level
Address
0x12
Name
LED1On
Acc
R/W
Bits
7:0
Field
LED Engine 1 on Level
Function
Set LED engine 1 on intensity
level.
4.3.7 LED Engine 1 Fade In/Out Timing
Address Name Acc Bits Field
0x13 LED1Fade R/W 7:4 LED engine 1 Fade In
Time
Function
Set time per intensity step when changing from
idle to on, idle to prox or prox to on states.
StepTime = (n + 1) * 500us
The total time required to change from one level
to another will be:
ChangeTime = abs(CurrLevel - NewLevel) *
StepTime
R/W 3:0
LED engine 1 Fade Out Set time per intensity step when changing from
Time
on to idle, on to prox or prox to idle states.
StepTime = (n + 1) * 500us
The total time required to change from one level
to another will be:
ChangeTime = abs(CurrLevel - NewLevel) *
StepTime
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4.3.8 LED Engine 2 On Level
Address Name
0x14 LED2On
Acc
R/W 7:0
Bits Field
LED Engine 2 on Level
Function
Set LED engine 2 on intensity level.
4.3.9 LED Engine 2 Fade In/Out Timing
Address Name Acc Bits Field
0x15 LED2Fade R/W 7:4 LED engine 2 Fade In
Time
Function
Set time per intensity step when changing from
idle to on, idle to prox or prox to on states.
StepTime = (n + 1) * 500us
The total time required to change from one level
to another will be:
ChangeTime = abs(CurrLevel - NewLevel) *
StepTime
R/W 3:0
LED engine 2 Fade Out Set time per intensity step when changing from
Time
on to idle, on to prox or prox to idle states.
StepTime = (n + 1) * 500us
The total time required to change from one level
to another will be:
ChangeTime = abs(CurrLevel - NewLevel) *
StepTime
4.3.10 LED Power Button Idle Level
Address Name Acc Bits Field
LEDPwrIdle R/W 7:0 Power Button LED Idle
Level
Function
0x16
Set Power button LED engine idle intensity
level.
4.3.11 LED Power Button On Level
Address Name
0x17
Acc Bits Field
LEDPwrOn R/W 7:0 Power Button LED On
Level
Function
Set Power button LED engine on intensity
level.
4.3.12 LED Power Button Off Level
Address Name
Acc Bits Field
Function
0x18 LEDPwrOff R/W 7:0
Power Button LED Off Level Set Power button LED engine off intensity
level.
4.3.13 LED Power Button Fade In/Out Timing
Address Name Acc Bits Field
LEDPwrFade R/W 7:0 Power Button Fade
Function
0x19
Set time per intensity step when changing from
one level to another.
In/Out Time
StepTime = (n + 1) * 250us
The total time required to change from one
level to another will be:
ChangeTime = abs(CurrLevel - NewLevel) *
StepTime
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4.3.14 Power-On Pulse width
Address Name
0x1A
Acc Bits Field
LEDPwrOnPw R/W 7:0 Power On Pulse
Width
Function
Set the duration of both the power on pulse
driven on the PWRON pin and the power LED
on time in breath idle power mode.
PowerOnPw = (n + 1) * 1ms
The power on pulse is triggered by either the
power button (if power button enabled
(0x1B[1]))
4.3.15 LED Power Button Mode
Address Name
0x1B
Acc Bits Field
Function
LEDPwrMode R/W
7
Power LED Off Mode
Enable off sequence based on TV power
state (0x07[4])
0 : Switch from idle to breathing
1 : Switch from idle (0x16) to Power LED
max (0x1B[5] and 0x17) for Power On PW
time (0x1A) before switching to breathing if
TV Power State = 1 (0x07[4])
R/W
R/W
6
5
Power LED Max Level
Set Power LED max level to be used during
power up and power down sequences
0 : Max set to Power Button LED On Level
1 : Max set to 255
Power LED Breath Max Set which level to use as high level while
breathing
0 : Breathing swings between LED power
button off level (0x18) and LED power
button idle level (0x16)
1 : Breathing swings between LED power
button off level (0x18) and LED power
button on level (0x17)
R/W
4
Power LED Waveform
Set Power LED waveform type
0 : Breath idle mode, power LED goes from
idle to breathing, breathes for Power On Pw
time and then goes back to idle
1 : Breath idle mode, power LED goes from
breathing to Power LED max for Power On
Pw time and then goes to idle
R/W
R/W
3
2
Reserved
Reserved
Reserved: set to 0
Reserved: set to 0
R/W
R/W
1
0
Power Button EN
Enable BL7 as power button
0 : BL7 is normal button
1 : BL7 is power button
Invert the polarity of the LED touch on level
0 : LED on level = programmed on level
1 : LED on level = 255 - programmed on
level
LED Touch Polarity
Invert
Effects touch on level only, not idle or prox
levels.
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4.4
CapSense Control
4.4.1 CapSense Enable
Address Name
Acc Bits Field
Cap Sense EN
Function
Set which BL sensors are
enabled
0x1E
CapSenseEnable R/W 7:0
Bit 7 = BL7 … Bit 0 = BL0
0 : Disabled
1 : Enabled
4.4.2 CapSense 0 through 7 (and Combined Channel Mode) Delta Cin range and LS Control
Address Name
Acc Bits Field
Function
0x1F
CapSensRange0
R/W 7:6
LS Control
LS usage during measurements for BL0
00 : LS high-Z (off)
01 : dynamically driven with measurement
signal (preferred)
10 : LS tied to GND
11 : LS tied to an internal Vref
R/W 5:2
R/W 1:0
Reserved
Delta Cin
Range
Reserved, set to 0000
For BL0
00 : +/-7pF
01 : +/-3.5pF
10 : +/-2.8pF
11: +/-2.3pF
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
CapSenseRange1
CapSenseRange2
CapSenseRange3
CapSenseRange4
CapSenseRange5
CapSenseRange6
CapSenseRange7
CapSenseRangeAll
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
Same as CapSensRange0 but for BL1
Same as CapSensRange0 but for BL2
Same as CapSensRange0 but for BL3
Same as CapSensRange0 but for BL4
Same as CapSensRange0 but for BL5
Same as CapSensRange0 but for BL6
Same as CapSensRange0 but for BL7
Same as CapSensRange0 but for combined
channels used as a prox sensor
4.4.3 CapSense 0 through 7 (and Combined Channel Mode) Detection Threshold
Address Name Acc Bits Field
Function
0x28
CapSenseThresh0
R/W 7:0
Touch Detection Threshold
BL0
Set the touch/prox detection
threshold for BL0.
Threshold = n * 16
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
CapSenseThresh1
CapSenseThresh2
CapSenseThresh3
CapSenseThresh4
CapSenseThresh5
CapSenseThresh6
CapSenseThresh7
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
R/W 7:0
Touch Detection Threshold
BL1
Touch Detection Threshold
BL2
Touch Detection Threshold
BL3
Touch Detection Threshold
BL4
Touch Detection Threshold
BL5
Touch Detection Threshold
BL6
Touch Detection Threshold
BL7
Same as CapSenseThresh0
but for BL1
Same as CapSenseThresh0
but for BL2
Same as CapSenseThresh0
but for BL3
Same as CapSenseThresh0
but for BL4
Same as CapSenseThresh0
but for BL5
Same as CapSenseThresh0
but for BL6
Same as CapSenseThresh0
but for BL7
Same as CapSenseThresh0
but for combined channels
used as a prox sensor
CapSenseThreshComb R/W 7:0
Touch Detection Threshold
Combined
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4.4.4 CapSense Auto Compensation, Proximity on BL0 and Combined Channels Proximity Enable
Address Name
0x31 CapSenseOp
Acc Bits Field
Function
0 : Enable automatic
compensation
R/W
7
Auto Compensation
1 : Disable automatic
compensation
R/W
R/W
6
5
Proximity BL0
0 : BL0 is normal button
1 : BL0 is proximity sensor
Proximity Combined
Channels
0 : Do not use combined
channels for proximity sensing
1 : Use combined channels
(0x3B) for proximity sensing
Reserved, set to 10100
R/W 4:0
Reserved
4.4.5 CapSense Raw Data Filter Coef, Digital Gain, I2C touch reporting and CapSense reporting
Address Name
Acc Bits Field
R/W 7:5 Raw Filter
Function
filter coefficient to turn raw data into
useful data
0x32
CapSenseMode
000 : off
001 : 1-1/2
010 : 1-1/4
011 : 1-1/8
100 : 1-1/16
101 : 1-1/32
110 : 1-1/64
111 : 1-1/128
R/W
4
Touch Reporting
(I2C)
Set which touches will be reported in
Touch Status (0x01)
0 : Report touches according to
CapSense Report Mode (0x32[1:0])
1 : Report all touches
R/W 3:2
CapSense Digital
Gain
Set digital gain factor
00 : No gain, Delta Cin Range = Delta
Cin Range
01 : X2 gain, Delta Cin Range = Delta
Cin Range / 2
10 : X4 gain, Delta Cin Range = Delta
Cin Range / 4
11 : X8 gain, Delta Cin Range = Delta
Cin Range / 8
Delta Cin outside of range will saturate.
Set mode for Reporting touches on LEDs
(and in reg 0x01 if 0x32[4] = 0)
00 : Single, only report the first touch
01 : Strongest, report the strongest touch
10 : Double, report the first touch for a BL
assigned to LED engine 1 and the first
touch for a BL assigned to LED engine 2
11 : Double LED, report the first two
touches for each LED engine but the
second touch goes directly from idle to
on or on to idle with no fading
Note: When prox detection is enabled,
LED engine 1 is dedicated to the prox
function and that limits these modes to
LED engine 2.
R/W 1:0
CapSense Report
Mode
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4.4.6 CapSense Debounce
Address Name
0x33 CapSenseDebounce R/W 7:6
Acc Bits Field
CapSense Prox Near
Debounce
Function
Set number of consecutive
samples that proximity detection
must be true before proximity is
indicated on LEDs and in register
0x02
00 : Debouncer off, proximity
indicated on first sample
01 : 2 samples
10 : 4 samples
11 : 8 samples
R/W 5:4
CapSense Prox Far
Debounce
Set number of consecutive
samples that proximity detection
must be false before los of
proximity is indicated on LEDs and
in register 0x02
00 : Debouncer off, loss of
proximity indicated on first sample
01 : 2 samples
10 : 4 samples
11 : 8 samples
R/W 3:2
CapSense Touch
Debounce
Set number of consecutive
samples that touch detection must
be true before touch is indicated on
LEDs and in register 0x01
00 : Debouncer off, touch indicated
on first sample
01 : 2 samples
10 : 4 samples
11 : 8 samples
R/W 1:0
CapSense Release
Debounce
Set number of consecutive
samples that touch detection must
be false before release is indicated
on LEDs and in register 0x01
00 : Debouncer off, release
indicated on first sample
01 : 2 samples
10 : 4 samples
11 : 8 samples
4.4.7 CapSense Negative Auto Compensation Threshold
Address Name Acc Bits Field
0x34 CapSenseNegCompThresh R/W 7:0 CapSense Neg Comp
Thresh
Function
Set negative level that
average data must cross
before triggering a negative
drift auto compensation.
Threshold = n * 128
Should not be set below 0x40.
4.4.8 CapSense Positive Auto Compensation Threshold
Address Name
Acc Bits Field
Function
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0x35
CapSensePosCompThresh R/W 7:0
CapSense Pos Comp
Thresh
Set positive level that average
data must cross before
triggering a positive drift auto
compensation.
Threshold = n * 128
Should not be set below 0x40.
4.4.9 CapSense Positive Filter Coef, Positive Auto Compensation Debouce and Proximity Hyst
Address Name
0x36 CapSensePosFilt R/W 7:5
Acc Bits Field
CapSense Prox Hyst
Function
Set Proximity detection/loss
hysteresis
000 : 2
001 : 8
010 : 16
011 : 32
100 : 64
101 : 128
110 : 256
111 : 512
Prox detection when Delta Data >=
(Prox Thresh + Prox Hyst), Prox lost
when Delta Data <= (Prox Thresh -
Prox Hyst)
R/W 4:3
CapSense Pos Comp
Debounce
Set number of consecutive samples
that average data is above the
positive compensation threshold
before a compensation is triggered
00 : Debouncer off, compensation
triggered on first sample
01 : 2 samples
10 : 4 samples
11 : 8 samples
R/W 2:0
CapSense Ave Pos Filt
Coef
Set filter coefficient for turning positive
useful data into average data
000 : Off, no averaging of positive
data
001 : 1-1/2
010 : 1-1/4
011 : 1-1/8
100 : 1-1/16
101 : 1-1/32 (suggested)
110 : 1-1/64
111 : 1-1/128
4.4.10 CapSense Negative Filter Coef, Negative Auto Compensation Debounce and Touch Hyst
Address Name
Acc Bits Field
Function
0x37
CapSenseNegFilt R/W 7:5 CapSense Touch Hyst
Set touch detection/loss hysteresis
000 : 2
001 : 8
010 : 16
011 : 32
100 : 64
101 : 128
110 : 256
111 : 512
Touch detection when Delta Data
>= (Touch Thresh + Touch Hyst),
Touch lost when Delta Data <=
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(Touch Thresh - Touch Hyst)
R/W 4:3
CapSense Neg Comp
Debounce
Set number of consecutive
samples that average data is below
the negative compensation
threshold before a compensation is
triggered
00 : Debouncer off, compensation
triggered on first sample
01 : 2 samples
10 : 4 samples
11 : 8 samples
R/W 2:0
CapSense Ave Neg Filt Coef
Set filter coefficient for turning
negative useful data into average
data
000 : Off, no averaging of positive
data
001 : 1-1/2
010 : 1-1/4 (suggested)
011 : 1-1/8
100 : 1-1/16
101 : 1-1/32
110 : 1-1/64
111 : 1-1/128
4.4.11 CapSense Stuck-at Timer and Periodic Compensation Timer
Address Name Acc Bits Field Function
CapSenseStuck R/W 7:4 CapSense Stuck at
0x38
Set stuck at timeout timer. If touch lasts
longer than timer, touch is disqualified and a
compensation is triggered.
Timer
0000 : Off
00bb : Timeout = bb * FrameTime * 64
01bb : Timeout = bb * FrameTime * 128
1bbb : Timeout = bbb * FrameTime * 256
FrameTime = (CapSense time + LED Frame
time) * 9
CapSense time = 648us
LED Frame time = 255 / LED Frequency
(0x0E)
R/W 3:0
CapSense Periodic
Comp
Set periodic compensation interval
0000 : Off, no periodic compensations
bbbb : Periodic compensation triggered every
bbbb * 128 frames
FrameTime = (CapSense time + LED Frame
time) * 9
CapSense time = 648us
LED Frame time = 255 / LED Frequency
(0x0E)
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4.4.12 CapSense Frame Skip setting fro Active and Sleep
Address Name
Acc Bits Field
Function
0x39 CapSenseFrameSkip R/W 7:4
CapSense Active Frame Set number of frames to skip
Skip
measuring BL pins between frames
that do measure the BL pins in
active mode. Timing and LED drive
remains constant.
Frames to skip = n
R/W 3:0
CapSense Sleep Frame Set number of frames to skip
Skip
measuring BL pins between frames
that do measure the BL pins in sleep
mode. Timing and LED drive
remains constant.
Frames to skip = n * 4
4.4.13 CapSense Sleep Enable, Auto Compensation Channels Threshold, Inactive BL Control
Address Name
0x3A CapSenseMisc R/W 7:6
R/W 5:4
Acc Bits Field
Function
Reserved, set to 00
Reserved
Comp Chan Num Thresh Set how many channels must request
compensation before a compensation is
done on all channels.
00 : Each channel is compensated
individually when compensation is
requested for that channel
bb : Compensation for all channels is
triggered when bb channels request
compensation
R/W
R/W
3
2
CapSense Sleep Mode
Enable
Reserved
0 : Disable sleep mode
1 : Enable sleep mode
Reserved, set to 0
R/W 1:0
CapSense Inactive BL
Mode
Set what is done with BL pins when other
BL pins are being measured.
00 : Inactive BLs are driven to LS levels
01 : Inactive BLs are driven to LS levels
10 : Inactive BLs are HiZ
11 : Inactive BLs are connected to GND
4.4.14 Proximity Combined Channel Mode Channel Mapping
Address Name Acc Bits Field
0x3B ProxCombChanMask R/W 7:0 Prox Combined Chan
Function
Assign indicated BL channel to be
used in combined channel mode for
proximity detection
Mask
Bit 7 = BL7 … Bit 0 = BL0
0 : Do not use in combined channel
mode
1 : Use in combined channel mode
4.5
4.5.1 SPO Channel Mapping
Address Name Acc Bits Field
SPO Control
Function
0x3E
SPOChanMap R/W 7:0
SPO Channel
Mapping
Assign each BL pin to report touches on either
SPO1 or SPO2.
Bit 7 = BL7 … Bit 0 = BL0
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0 : Report touches on SPO1
1 : Report touches on SPO2
4.5.2 SPO Analog Output Levels (BL0 through BL7 Touch, Idle and Proximity)
Address Name
Acc Bits Field
Function
0x3F
SPOLevelBL0 R/W 7:6 Reserved
Reserved, set to 00
R/W 5:0
SPO Level BL0
Specify analog output level for BL0
V = (n / 63) * SVDD
0x40
0x41
0x42
0x43
0x44
0x45
0x46
0x47
SPOLevelBL1 R/W 7:6
R/W 5:0
SPOLevelBL2 R/W 7:6
R/W 5:0
SPOLevelBL3 R/W 7:6
R/W 5:0
SPOLevelBL4 R/W 7:6
R/W 5:0
SPOLevelBL5 R/W 7:6
R/W 5:0
SPOLevelBL6 R/W 7:6
R/W 5:0
SPOLevelBL7 R/W 7:6
R/W 5:0
Reserved
SPO Level BL1
Reserved
SPO Level BL2
Reserved
SPO Level BL3
Reserved
SPO Level BL4
Reserved
SPO Level BL5
Reserved
SPO Level BL6
Reserved
SPO Level BL7
Reserved
Reserved, set to 00
Same as SPOLevelBL0 but for BL1
Reserved, set to 00
Same as SPOLevelBL0 but for BL2
Reserved, set to 00
Same as SPOLevelBL0 but for BL3
Reserved, set to 00
Same as SPOLevelBL0 but for BL4
Reserved, set to 00
Same as SPOLevelBL0 but for BL5
Reserved, set to 00
Same as SPOLevelBL0 but for BL6
Reserved, set to 00
Same as SPOLevelBL0 but for BL7
Reserved, set to 00
SPOLevelIdle
R/W 7:6
R/W 5:0
SPO Level Idle
Specify analog output level for idle
V = (n / 63) * SVDD
0x48
SPOLevelProx R/W
R/W
7
6
SPO Report Prox
Enable reporting of proximity on SPO
0 : Do not report proximity on SPO
1 : Report proximity on SPO
0 : Report proximity on SPO1
1 : Report proximity on SPO2
SPO Prox Channel
Mapping
R/W 5:0
SPO Level Prox
Specify analog output level for proximity
V = (n / 63) * SVDD
4.6
4.6.1 Buzzer Trigger Event Selection
Address Name Acc Bits Field
Buzzer Control
Function
0x4B
BuzzerTrigger
R/W 7:5
Reserved
Reserved, set to 000
R/W
4
Buzzer Near
0 : Do not activate buzzer on proximity
detection
1 : Activate buzzer on proximity detection
0 : Do not activate buzzer on proximity loss
1 : Activate buzzer on proximity loss
R/W
R/W
R/W
3
2
1
Buzzer Far
Buzzer Touch 0 : Do not activate buzzer on touch detection
1 : Activate buzzer on touch detection
Buzzer
Release
0 : Do not activate buzzer on touch release
1 : Activate buzzer on touch release
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R/W
0
Buzzer Idle
Level
Set SPO2 pin drive level in buzzer mode when
buzzer is not active.
0 : GND
1 : VDD
4.6.2 Buzzer Duration and Frequency
Address Name
Acc Bits Field
Function
0x4C BuzzerFreq R/W 7:6
Buzzer Phase 1 Duration 00 : 5ms
01 : 10ms
10 : 15ms
11 : 30ms
R/W 5:4
R/W 3:2
R/W 1:0
Buzzer Phase 1
Frequency
00 : 1KHz
01 : 2KHz
10 : 4KHz
11 : 8KHz
Buzzer Phase 2 Duration 00 : 5ms
01 : 10ms
10 : 15ms
11 : 30ms
Buzzer Phase 2
Frequency
00 : 1KHz
01 : 2KHz
10 : 4KHz
11 : 8KHz
4.7
4.7.1 CapSense Channel Select for Readback
Address Name Acc Bits Field
Real Time Sensor Data Readback
Function
Reserved, will read 0000
0x63 CapSenseChanSelect
R
R
7:4
3:0
Reserved
CapSense Chan Select Set which BL channel data will be
present in registers 0x64 through
0x6B
0000 : BL0
…
0111 : BL7
1000 : Combined channel proximity
4.7.2 CapSense Useful Data MSB and LSB
Address Name
Acc Bits Field
Function
0x64
CapSenseUsefulDataMsb
R
7:0
CapSense Useful Data
Msb
Selected channel useful data.
Signed, 2's complement format
0x65
CapSenseUsefulDataLsb
R
7:0
CapSense Useful Data
Lsb
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4.7.3 CapSense Average Data MSB and LSB
Address Name
Acc Bits Field
Function
0x66
CapSenseAverageDataMsb
R
7:0
CapSense Average
Data Msb
Selected channel average
data.
Signed, 2's complement format
0x67
CapSenseAverageDataLsb
R
7:0
CapSense Average
Data Lsb
4.7.4 CapSense Diff Data MSB and LSB
Address Name Acc Bits Field
Function
0x68
CapSenseDiffDataMsb
R
7:0
CapSense Diff Data
Selected channel diff data.
Msb
Signed, 2's complement format
0x69
CapSenseDiffDataLsb
R
7:0
CapSense Diff Data
Lsb
4.7.5 CapSense Compensation DAC Value MSB and LSB
Address Name Acc Bits Field
Function
0x6A
CapSenseCompMsb
R/W 7:0
CapSense Comp Msb
Offset compensation DAC code.
Read : Read the current value from
the last compensation for the
selected channel
0x6B
CapSenseCompLsb
R/W 7:0
CapSense Comp Lsb
Write : Manually set the
compensation DAC for the selected
channel.
When written, the internal DAC
code is updated after the write of
the LSB reg. MSB and LSB regs
should be written in sequence.
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5
I2C INTERFACE
The I2C implemented on the SX9512/12B/13/13B is compliant with:
- standard (100kb/s), fast mode (400kb/s)
- slave mode
- 7 bit address : SX9512/13->0x2B ; SX9512B/13B ->0x2D.
The host can use the I2C to read and write data at any time.
Three types of registers are considered:
- status (read). These registers give information about the status of the capacitive buttons, GPIs, operation modes
etc…
- control (read/write). These registers control the soft reset, operating modes, GPIOs and offset compensation.
- REGISTERS gateway (read/write). These registers are used for the communication between host and the
REGISTERS. The REGISTERS gateway communication is done typically at power up and is not supposed to be
changed when the application is running. The REGISTERS needs to be re-stored each time the
SX9512/12B/13/13B is powered down.
The REGISTERS can be stored permanently in the NVM memory of the SX9512/12B/13/13B. The REGISTERS
gateway communication over the I2C at power up is then not required.
The I2C will be able to read and write from a start address and then perform read or writes sequentially, and the
address increments automatically.
The supported I2C access formats are described in the next sections.
5.1
I2C Write
The format of the I2C write is given in Figure 36.
After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The
SX9512/12B/13/13B then acknowledges [A] that it is being addressed, and the master sends an 8 bit Data Byte
consisting of the SX9512/12B/13/13B Register Address (RA). The slave acknowledges [A] and the master sends
the appropriate 8 bit Data Byte (WD0). Again the slave acknowledges [A]. In case the master needs to write more
data, a succeeding 8 bit Data Byte will follow (WD1), acknowledged by the slave [A]. This sequence will be
repeated until the master terminates the transfer with the Stop condition [P].
Figure 36 I2C write
The register address is incremented automatically when successive register data (WD1...WDn) is supplied by the
master.
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5.2
I2C read
The format of the I2C read is given in Figure 37.
After the start condition [S], the slave address (SA) is sent, followed by an eighth bit (‘0’) indicating a Write. The
SX9512/12B/13/13B then acknowledges [A] that it is being addressed, and the master responds with an 8 bit data
consisting of the Register Address (RA). The slave acknowledges [A] and the master sends the Repeated Start
Condition [Sr]. Once again, the slave address (SA) is sent, followed by an eighth bit (‘1’) indicating a Read.
The SX9512/12B/13/13B responds with acknowledge [A] and the Read Data byte (RD0). If the master needs to
read more data it will acknowledge [A] and the SX9512/12B/13/13B will send the next read byte (RD1). This
sequence can be repeated until the master terminates with a NACK [N] followed by a stop [P].
Figure 37 I2C read
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6 PACKAGING INFORMATION
6.1
Package Outline Drawing
SX9512/12B and SX9513/13B are assembled in a QFN-20 package as shown in Figure 38 and TSSOP-24 as
show in Figure 39.
Figure 38 QFN Package outline drawing
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Figure 39 TSSOP Package outline drawing
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6.2
The land pattern of QFN-20 package is shown in Figure 40.
The land pattern of TSSOP-24 package is shown in Figure 41.
Land Pattern
Figure 40 QFN-20 Land Pattern
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Figure 41 TSSOP-24 Land Pattern
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CONTACT INFORMATION
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