ETC TSM12

TSM12
12-Channel Self Calibration Capacitive Touch Sensor
SPECIFICATION V1.3
November 2006
ADSemiconductor Confidential
 Revision History
Rev.
1.0
1.1
1.2
1.3
Description of change
Initial Release
Revision Flow chart , Appending 'Wait 100ms'
Revision Unused CS pin -> Connect with GND
Appending MLF package
Appending MLF package Dimension
Appending MLF package marking spec
Date
Originator
06.11.15
09.06.04
10.02.10
BM KIM
SB CHEONG
KD PARK
10.02.10
KDPARK
ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
1 Specification
1.1 General Feature

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12-Channel capacitive sensor with auto sensitivity calibration
Selectable output operation (single mode / multi-mode)
Independently adjustable in 8 step sensitivity
Sync function for multi chip application
Touch intensity can be detectable within 3 steps (Low, Middle and High)
Adjustable internal frequency with external resister
Adjustable response time and interrupt level by the control registers
I2C serial interface
Embedded high frequency noise elimination circuit
IDLE mode to save the consumption
Embedded power key function on channel 1 for mobile phone application
RoHS compliant 32QFN, 32MLF packages
1.2

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
Application
Mobile application (mobile phone / PDA / PMP etc)
Membrane switch replacement
Sealed control panels, keypads
Door key-lock matrix application
Touch screen replacement application
1.3 Package (32QFN, 32MLF)
TSM12-32QFN
TSM12-32MLF
Drawings not to scale
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
2 Pin Description (32QFN, 32MLF)
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Name
RBIAS
SRBIAS
CS5
CS6
CS7
CS8
CS9
N.C.
CS10
VDD
CS11
CS12
VSS
NC
IRBIAS
RST
OUT1
SCL
19
SDA
20
21
22
23
24
25
26
INT
I2C_EN
ID_SEL
P_CDEG0
P_CDEG1
P_CDEG2
VSS
27
28
29
30
31
32
Note 1
:
I/O
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Digital Input
Analog Input
Analog Input
Ground
Analog Input
Digital Input
Digital Output
Digital Input
Digital
Input/Output
Digital Output
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Description
Internal bias adjust input
IDLE Mode Internal bias adjust input
CH5 capacitive sensor input
CH6 capacitive sensor input
CH7 capacitive sensor input
CH8 capacitive sensor input
CH9 capacitive sensor input
No Connection
CH10 capacitive sensor input
CH11 capacitive sensor input
CH12 capacitive sensor input
Supply ground
No Connection
Internal I2C clk frequency adjust input
System reset (High reset)
CH1 output (Open drain)
I2C clock input
Protection
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD
VDD/GND
VDD/GND
VDD/GND
VDD/GND
I2C data (Open drain)
VDD/GND
Interrupt output (Open drain)
I2C enable(Low enable)
I2C address selection
Ch1 sensitivity selection bit0
Ch1 sensitivity selection bit1
Ch1 sensitivity selection bit2
Output mode selection
Digital
SYNC/OPT
(Single Output / Multi Output Note 1)
Input/Output
Sync pulse input /output
VDD
Power
Power (2.5V~5.0V)
CS1
Analog Input
CH1 capacitive sensor input
CS2
Analog Input
CH2 capacitive sensor input
CS3
Analog Input
CH3 capacitive sensor input
CS4
Analog Input
CH4 capacitive sensor input
Refer to 6.3 SYNC/OPT implementation
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
GND
VDD/GND
VDD/GND
VDD/GND
VDD/GND
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
3 Absolute Maximum Rating
Battery supply voltage
5.0V
Maximum voltage on any pin VDD+0.3
Maximum current on any PAD 100mA
Power Dissipation
800mW
Storage Temperature
-50 ~ 150℃
Operating Temperature
-20 ~ 75℃
Junction Temperature
150℃
Note Unless any other command is noted, all above are operated in normal temperature.
4 ESD & Latch-up Characteristics
4.1 ESD Characteristics
Mode
H.B.M
M.M
Polarity
Pos / Neg
Pos / Neg
Max
Reference
2000V
VDD
2000V
VSS
2000V
P to P
200V
VDD
200V
VSS
200V
P to P
500V
C.D.M
Pos / Neg
DIRECT
800V
4.2 Latch-up Characteristics
Mode
Polarity
Max
Positive
200mA
Negative
-200mA
Positive
8.0V
I Test
V supply over 5.0V
Test Step
25mA
1.0V
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
5 Electrical Characteristics
▪ VDD=3.3V, Rb=510k, Sync Mode (Rsync = 2MΩ) (Unless otherwise noted), TA = 25℃
Characteristics
Symbol
Test Condition
Min
Typ
Max
Units
Operating supply voltage
VDD
3.3
80
200
7
15
1.5
2.3
-
5.0
130
315
1
V
VDD= 3.3V RB=510k
VDD= 5.0V RB=510k
VDD= 3.3V RB=510k
VDD= 5.0V RB=510k
VDD= 3.3V RB=510k
VDD= 5.0V RB=510k
IDD_I2C Disable
2.5
-
-
4.0
㎃
CS
-
10
100
㎊
RS
-
200
1000
Ω
0.2
-
-
㎊
-
12
-
-
30M
-
-
100
80
-
VDD = 3.3V
200
510
820
VDD = 5.0V
330
620
1200
IDD
Current consumption
Note1
IDD_I2C
Output maximum sink
current
Sense input
capacitance range
IOUT
R_SB=0
R_SB=0
R_SB=3M
R_SB=3M
RI2C =20k
RI2C =30k
TA = 25℃
㎂
mA
㎂
Note2
Sense input
resistance range
Minimum detective
capacitance difference
Output impedance
(open drain)
Self calibration time after
system reset
Recommended bias
resistance range
Note3
ΔC
Zo
TCAL
RB
Cs = 10pF, CDEG = 200pF
(I2C default sensitivity select)
ΔC > 0.2pF, Cs = 10pF,
(I2C default sensitivity select)
ΔC < 0.2pF, Cs = 10pF,
(I2C default sensitivity select)
VDD = 3.3V RB = 510k
VDD = 5.0V RB = 510k
Ω
ms
kΩ
Maximum bias
CB_MAX
820
1000
pF
capacitance
Recommended sync
RSYNC
1
2
20
MΩ
resistance range
Note 1 : In case of SCL frequency is 500kHz.
Note 2 : The sensitivity can be increased with lower CS value.
The recommended value of CS is 10pF when using 3T PC(Poly Carbonate) cover and
10 ㎜ x 7 ㎜ touch pattern.
Note 3 : The lower RB is recommended in noisy condition.
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
6 Implementation of TSM12
6.1 RBIAS & SRBIAS implementation
VDD
CB
RBIAS <<
RB
SRBIAS <<
RSB
The RBIAS is connecting to the resistor to decide the oscillator and internal bias current. The
sensing frequency, internal clock frequency and current consumption are therefore able to be
adjusted with RB. A voltage ripple on RBIAS can make critical internal error, so CB is connected
to the VDD (not GND) is recommended. (The typical value of CB is 820pF and the maximum
Value is 1nF.)
The RSB should be connected as above figure when the TSM12 operates in IDLE Mode to save
the current consumption. In this case, the consumption depends on the sum of the serial
resistors and the response time might be longer.
IDD [uA]
450
2.5 V
400
3.3 V
350
5.0 V
300
250
200
150
100
50
0
100
300
500
700
900
1100
RB [kΩ]
Normal operation current consumption curve (Pin21 I2C_EN is High)
The current consumption curve of TSM12 is represented in accordance with RB value as above.
The lower RB requires more current consumption but it is recommended in noisy application. For
example, refrigerator, air conditioner and so on.
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
6.2 CS implementation
CS12 <<
RS12
Touch PAD12
CS12
RS1
CS1 <<
Touch PAD1
CS1
The TSM12 has basically eight steps sensitivity, which is available to control with internal
register by I2C interface. The parallel capacitor CS1 is added to CS1 and CS12 to CS12 to adjust
sensitivity. The sensitivity will be increased when smaller value of CS is used. (Refer to the
below Sensitivity Example Figure) It could be useful in case detail sensitivity mediation is
required. The internal touch decision process of each channel is separated from each other.
The twelve channel touch key board application can therefore be designed by using only one
TSM12 without coupling problem. The RS is serial connection resistor to avoid mal-function
from external surge and ESD. (It might be optional.) From 200Ω to 1kΩ is recommended for RS.
The size and shape of PAD might have influence on the sensitivity. The sensitivity will be
optimal when the size of PAD is approximately an half of the first knuckle (it’s about 10 ㎜ｘ
7 ㎜). The connection line of CS1 ~ CS12 to touch PAD is recommended to be routed as short
as possible to prevent from abnormal touch detect caused by connection line. The unused CS
pin must be connected with the ground to prevent the unpredictable mal-function that occurred
in the floating CS pin.
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
Sensitivity example figure with default sensitivity selection
6.3 SYNC/OPT implementation
6.3.1
Output Mode Option
This pin will be assigned for the output mode option selection. It will decide that TSM12 is
working on single or multi touch detection mode. It should be implemented as below for these.
VDD
SYNC/OPT <<
(Single Output Mode Implementation)
SYNC/OPT <<
(Multi Output Mode Implementation)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
6.3.2 Multi Chip Application
Over two TSM12 can work on the one application at the same time thanks to SYNC function
with this pin. The SYNC pulse prevents over two sensing signal from interfering with each other.
RSYNC is pull-down resistor of SYNC/OPT pin. Too big value of RSYNC makes the SYNC pulse
falling delay, and too small value of RSYNC makes rising delay. Typical value of RSYNC is 2MΩ.The
Sync pin should be implemented as below. The TSM12 can also be used with the other TSxx
series by employing this SYNC function. The TSM12 could only operate on multi output mode in
this configuration.
SYNC/OPT
<<
st
1 TSM12
RSYNC
SYNC(/OPT)<<
nd
2 TSM12 or TS**
6.4 P_CDEG2 , P_CDEG1, P_CDEG0 implementation
The P_CDEG0, 1 and 2 are only for the CS1 to control the sensitivity. The sensitivity of channel
1 will be controlled by the register (refer to the “sensitivity control register” chapter) same as the
other channel if the P_CDEG(2:0) value is 011. But it should be fixed as following table if the
P_CDEG(2:0) value is not 011.
The sensitivity table of channel 1
P_CDEG(2:0)
Sensitivity of Channel 1 (@Cs = 0pF)
011
Respect the register value (refer to the I2C register description)
000
14~16T
001
12~14T
010
10~12T
100
7~9T
101
6~8T
110
5~7T
111
3~5T
Note 1: The unit T represents the thickness (mm) of a panel in case of poly-carbonate.
Note 2: The above table data is compatible with a pad size that is approximately an half of the
first knuckle. (it’s about 10 ㎜ｘ 7 ㎜)
The channel 1 provides the output with two ways whether the I2C or the out1 (pin17) directly.
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
6.5 RESET implementation
TSM12 has internal data latches, so initial state of these latches must be reset by external reset
pulse before normal operation starts. The reset pulse can be controlled by host MCU directly or
other reset device. If not, the circuit should be composed as below figure. The reset pulse must
have high pulse duration about a few msec to cover power VDD rising time. The recommended
value of RRST and CRST are 330KΩ and 100nF.
VDD
CRST
RESET <<
RRST
Recommended reset circuits 1
The better performance is warranted with below reset circuit. The Q1 is turned on and makes
reset pulse when power is on and VDD is raised to operating voltage. After a few msec (duration
time is determined by R7, R8, C5), Q1 is turned off and TSM12 can be operated with normal
sensitivity.
VDD
R7
200K
Q1
2N3906
R8 200K
RESET
C5
220nF
R9
470K
Recommended reset circuits 2
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
7 I2C Interface
7.1 IRBIAS Implementation
IRBIAS <<
RIB
The RIB is only charged in making the I2C internal clock and should be implemented as above
figure. The smaller RIB will increase the I2C internal clock frequency and current consumption.
(Refer to the following consumption curve)
I2C IDD Measure (RB = 510kΩ)
I2C IDD [uA]
3500
VDD = 3.3V
VDD = 5.0V
3000
2500
2000
1500
1000
500
0
10
20
30
40
RIB [kΩ]
50
60
70
80
I2C Block operation current consumption curve
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
I2C Clk Freq.
[MHz]
I2C Clk Freq. (RB = 510kΩ)
12.00
VDD = 3.3V
10.00
VDD = 5.0V
8.00
6.00
4.00
2.00
0.00
10
20
30
40
50
60
70
80
RIB [kΩ]
I2C clock frequency curve
7.2
Start & Stop Condition
 Start Condition (S)
 Stop Condition (P)
 Repeated Start (Sr)
The EN (Pin21) should be low before START condition and be high after STOP condition.
EN
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7.3 Data validity
The SDA should be stable when the SCL is high and the SDA can be changed when the SCL is
low.
7.4 Byte Format
The byte structure is composed with 8Bit data and an acknowledge signal.
7.5 Acknowledge
It is a check bit whether the receiver gets the data from the transmitter without error or not. The
receiver will write ‘0’ when it received the data successfully and ‘1’ if not.
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
7.6 First Byte
7.6.1 Slave Address
It is the first byte from the start condition. It is used to access the slave device.
TSM12 Chip Address : 7bit
ID_SEL
GND
VDD
Address
0xD0
0xF0
─
7.6.2 R/W
The direction of data is decided by the bit and it follows the address data.
MSB
Address
LSB
R/W
7 bit
1bit
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7.7 Transferring Data
7.7.1 Write Operation
The byte sequence is as follows:
■ the first byte gives the device address plus the direction bit (R/W = 0).
■ the second byte contains the internal address of the first register to be accessed.
■ the next byte is written in the internal register. Following bytes are written in successive
internal registers.
■ the transfer lasts until stop conditions are encountered.
■ the TSM12 acknowledges every byte transfer.
7.7.2 Read Operation
The address of the first register to read is programmed in a write operation without data, and
terminated by the stop condition. Then, another start is followed by the device address and
R/W= 1. All following bytes are now data to be read at successive positions starting from the
initial address.
7.7.3 Read/Write Operation
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7.8 I2C write and read operations in normal mode
2
The following figure represents the I C normal mode write and read registers.
☞ Write register 0x00 to 0x01 with data AA and BB
Start
Device
Address 0xD0
ACK
Register
Address 0x00
ACK
Data AA
ACK
Data BB
ACK
Stop
Read register 0x00 and 0x01
Start
Device
Address 0xD0
ACK
Register
Address 0x00
ACK
Start
Device
Address 0xD1
ACK
Data Read AA
ACK
From Master to Slave
Stop
Data Read BB
ACK
Stop
From Slave to Master
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8 TSM12 Register List
 Note: The unused bits (defined as reserved) in I²C registers must be kept to zero.
 Note: The bit0 and bit1 of CTRL2 register must be written by 0b11 after power on during an
initialize phase. (Refer to the chapter 9. initialize flow)
 Note: HS (High Sensitivity) / MS (Middle Sensitivity) / LS (Low Sensitivity)
 Note: Low Output (light touch) / Middle Output (middle touch) / High Output (hard touch)
8.1 I2C Register Map
Name
Sensitivity1
Sensitivity2
Sensitivity3
Sensitivity4
Sensitivity5
Sensitivity6
CTRL1
CTRL2
Ref_rst1
Ref_rst2
Ch_hold1
Ch_hold2
Cal_hold1
Cal_hold2
Output1
Output2
Output3
Addr. Reset Value
(Hex)
(Bin)
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
1011
1011
1011
1011
1011
1011
0010
0000
1111
0000
1111
0000
0000
0000
0000
0000
0000
1011
1011
1011
1011
1011
1011
0010
01XX
1110
1111
1110
1111
0000
0000
0000
0000
0000
Register Function and Description
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Ch2HL
Ch2M
Ch1HL
Ch4HL
Ch4M
Ch3HL
Ch6HL
Ch6M
Ch5HL
Ch8HL
Ch8M
Ch7HL
Ch10HL
Ch10M
Ch9HL
Ch12HL
Ch12M
Ch11HL
MS
FTC
ILC
0
0
0
0
SRST
IDLE
Ch8
Ch7
Ch6
Ch5
Ch4
Ch3
0
0
0
0
Ch12
Ch11
Ch8
Ch7
Ch6
Ch5
Ch4
Ch3
0
0
0
0
Ch12
Ch11
Ch8
Ch7
Ch6
Ch5
Ch4
Ch3
0
0
0
0
Ch12
Ch11
OUT4
OUT3
OUT2
OUT8
OUT 7
OUT6
OUT12
OUT11
OUT10
Bit1
Bit0
Ch1M
Ch3M
Ch5M
Ch7M
Ch9M
Ch11M
RTC
1
1
Ch2
Ch1
Ch10
Ch9
Ch2
Ch1
Ch10
Ch9
Ch2
Ch1
Ch10
Ch9
OUT1
OUT5
OUT9
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.2 Sensitivity Control Register
Sensitivity1
Channel 1 & 2 Sensitivity Control
Address (hex): 02h
Type: R/W
Bit7
Bit6
Ch2HL
Bit5
Bit4
Ch2M[2:0]
Bit3
Bit2
Ch1HL
Bit1
Bit0
Ch1M[2:0]
Description
The sensitivity of channel 1 and 2 are adjustable by Sensitivity_1 register. ChxM[2:0] allows
various middle sensitivity and also the high and low sensitivities are decided with ChxHL.
Bit name
Reset
Function
ChxM[2:0]
011
ChxHL
1
Sensitivity2
Channel 3 & 4 Sensitivity Control
Address (hex): 03h
Type: R/W
Bit7
Bit6
Ch4HL
Middle sensitivity T (= thickness of PC) @Cs = 0pF
000: 14~16T
100: 7~9T
001: 12~14T
101: 6~8T
010: 10~12T
110: 5~7T
011: 08~10T
111: 3~5T
High and Low sensitivity selection for channel x
0: HS = MS - (MS * 0.2)
LS = MS + (MS * 0.2)
1: HS = MS - (MS * 0.3)
LS = MS + (MS * 0.3)
Bit5
Bit4
Ch4M[2:0]
Bit3
Ch3HL
Bit2
Bit1
Bit0
Ch3M[2:0]
Description
The sensitivity of channel 3 and 4 are adjustable by Sensitivity_2 register. ChxM[2:0] allows
various middle sensitivity and also the high and low sensitivities are decided with ChxHL.
Bit name
Reset
Function
ChxM[2:0]
011
ChxHL
1
Middle sensitivity T (= thickness of PC) @Cs = 0pF
000: 14~16T
100: 7~9T
001: 12~14T
101: 6~8T
010: 10~12T
110: 5~7T
011: 08~10T
111: 3~5T
High and Low sensitivity selection for channel x
0: HS = MS - (MS * 0.2)
LS = MS + (MS * 0.2)
1: HS = MS - (MS * 0.3)
LS = MS + (MS * 0.3)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
Sensitivity3
Channel 5 & 6 Sensitivity Control
Address (hex): 04h
Type: R/W
Bit7
Bit6
Ch6HL
Bit5
Bit4
Ch6M[2:0]
Bit3
Bit2
Ch5HL
Bit1
Bit0
Ch5M[2:0]
Description
The sensitivity of channel 5 and 6 are adjustable by Sensitivity_3 register. ChxM[2:0] allows
various middle sensitivity and also the high and low sensitivities are decided with ChxHL.
Bit name
Reset
Function
ChxM[2:0]
011
ChxHL
1
Sensitivity4
Channel 7 & 8 Sensitivity Control
Address (hex): 05h
Type: R/W
Bit7
Bit6
Ch8HL
Middle sensitivity T (= thickness of PC) @Cs = 0pF
000: 14~16T
100: 7~9T
001: 12~14T
101: 6~8T
010: 10~12T
110: 5~7T
011: 08~10T
111: 3~5T
High and Low sensitivity selection for channel x
0: HS = MS - (MS * 0.2)
LS = MS + (MS * 0.2)
1: HS = MS - (MS * 0.3)
LS = MS + (MS * 0.3)
Bit5
Bit4
Ch8M[2:0]
Bit3
Ch7HL
Bit2
Bit1
Bit0
Ch7M[2:0]
Description
The sensitivity of channel 7 and 8 are adjustable by Sensitivity_4 register. ChxM[2:0] allows
various middle sensitivity and also the high and low sensitivities are decided with ChxHL.
Bit name
Reset
Function
ChxM[2:0]
011
ChxHL
1
Middle sensitivity T (= thickness of PC) @Cs = 0pF
000: 14~16T
100: 7~9T
001: 12~14T
101: 6~8T
010: 10~12T
110: 5~7T
011: 08~10T
111: 3~5T
High and Low sensitivity selection for channel x
0: HS = MS - (MS * 0.2)
LS = MS + (MS * 0.2)
1: HS = MS - (MS * 0.3)
LS = MS + (MS * 0.3)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
Sensitivity5
Channel 9 & 10 Sensitivity Control
Address (hex): 06h
Type: R/W
Bit7
Bit6
Ch10HL
Bit5
Bit4
Ch10M[2:0]
Bit3
Bit2
Ch9HL
Bit1
Bit0
Ch9M[2:0]
Description
The sensitivity of channel 9 and 10 are adjustable by Sensitivity_5 register.ChxM[2:0] allows
various middle sensitivity and also the high and low sensitivities are decided with ChxHL.
Bit name
Reset
Function
ChxM[2:0]
011
ChxHL
1
Sensitivity6
Channel 11 & 12 Sensitivity Control
Address (hex): 07h
Type: R/W
Bit7
Bit6
Ch12HL
Middle sensitivity T (= thickness of PC) @Cs = 0pF
000: 14~16T
100: 7~9T
001: 12~14T
101: 6~8T
010: 10~12T
110: 5~7T
011: 08~10T
111: 3~5T
High and Low sensitivity selection for channel x
0: HS = MS - (MS * 0.2)
LS = MS + (MS * 0.2)
1: HS = MS - (MS * 0.3)
LS = MS + (MS * 0.3)
Bit5
Bit4
Ch12M[2:0]
Bit3
Bit2
Ch11HL
Bit1
Bit0
Ch11M[2:0]
Description
The sensitivity of channel 11 and 12 are adjustable by Sensitivity_6 register. ChxM[2:0] allows
various middle sensitivity and also the high and low sensitivities are decided with ChxHL.
Bit name
Reset
Function
ChxM[2:0]
011
ChxHL
1
Middle sensitivity T (= thickness of PC) @Cs = 0pF
000: 14~16T
100: 7~9T
001: 12~14T
101: 6~8T
010: 10~12T
110: 5~7T
011: 08~10T
111: 3~5T
High and Low sensitivity selection for channel x
0: HS = MS - (MS * 0.2)
LS = MS + (MS * 0.2)
1: HS = MS - (MS * 0.3)
LS = MS + (MS * 0.3)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.3 General Control Register1
CTRL1
TSM12 General Control Register1
Address (hex): 08h
Type: R/W
Bit7
Bit6
MS
Bit5
FTC[1:0]
Bit4
Bit3
ILC[1:0]
Bit2
Bit1
Bit0
RTC[2:0]
Description
The calibration speed just after power on reset is very high during the time which is defined by
FTC[1:0] to have a good adoption against unstable external environment.
Bit name
Reset
Function
MS
0
FTC[1:0]
01
ILC[1:0]
00
RTC[2:0]
011
Mode Selection
0: auto alternate (fast/slow) mode
1: fast mode
First Touch Control
Below time stands on VDD = 3V / Rb = 300KΩ
00: 5 sec
01: 10 sec
10: 15 sec
11: 20 sec
Interrupt Level Control
00: Interrupt is on middle or high output.
01: Interrupt is on low or middle or high output.
10: Interrupt is on middle or high output.
11: Interrupt is on high output.
Response Time Control
Response period = RTC[2:0] + 2
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.4 General Control Register2
CTRL2
TSM12 General Control Register2
Address (hex): 09h
Type: R/W
Bit7
Bit6
0
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
0
SRST
SLEEP
1
1
0
Description
All the digital blocks except analog and I2C block are reset when SRST is set. The SLEEP
function allows getting very low current consumption when it is set. But the response time will
be longer than normal operation. The bit0 and bit1 must be written with 0b’11 by host MCU.
Bit name
Reset
Function
SRST
0
SLEEP
1
Bit[1:0]
XX
Software Reset
0: Disable Software Reset
1: Enable Software Reset
Sleep Mode Enable
0: Disable Sleep Mode
1: Enable Sleep Mode
These bits must be written by 0b’11 during a system initialize
phase. (refer to the chapter 9 “initialize flow example”)
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.5 Channel Reference Reset Control Register
Ref_rst1
Channel1~8 Reference Reset Control
Address (hex): 0Ah
Type: R/W
Bit7
Bit6
Ch8
Ch7
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Ch6
Ch5
Ch4
Ch3
Ch2
Ch1
Description
The reference value of each channel will be renewing when Chx is set.
Bit name
Reset
Function
Chx
1
Ch1
0
0:
1:
0:
1:
Ref_rst2
Channel9~12 Reference Reset Control
Address (hex): 0Bh
Type: R/W
Bit7
Bit6
0
Disable reference reset
Enable reference reset
Disable reference reset
Enable reference reset
0
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
0
Ch12
Ch11
Ch10
Ch9
Description
The reference value of each channel will be renewing when Chx is set.
Bit name
Reset
Function
Chx
1
0: Disable reference reset
1: Enable reference reset
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.6 Channel 1~8 Sensing Control Register
Ch_hold1
Channel 1 ~ 8 Hold Enable Register
Address (hex): 0Ch
Type: R/W
Bit7
Bit6
Ch8
Ch7
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Ch6
Ch5
Ch4
Ch3
Ch2
Ch1
Description
The operation of each channel is independently available to control. A channel doesn’t be
worked and the calibration is paused when it is set.
Bit name
Reset
Function
Chx
1
Ch1
0
0:
1:
0:
1:
Enable operation (sensing + calibration)
Hold operation (No sensing + Stop calibration)
Enable operation (sensing + calibration)
Hold operation (No sensing + Stop calibration)
8.7 Channel 9~12 Sensing Control Register
Ch_hold2
Channel 9 ~ 12 Hold Enable Register
Address (hex): 0Dh
Type: R/W
Bit7
Bit6
0
0
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
0
Ch12
Ch11
Ch10
Ch9
Description
The operation of each channel is independently available to control. A channel doesn’t be
worked and the calibration is paused when it is set.
Bit name
Reset
Function
CEx
1
0: Enable operation (sensing + calibration)
1: Hold operation (No sensing + Stop calibration)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.8 Channel 1~8 Calibration Control Register
Cal_hold1
Channel 1 ~ 8 Calibration Enable Register
Address (hex): 0Eh
Type: R/W
Bit7
Bit6
Ch8
Ch7
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Ch6
Ch5
Ch4
Ch3
Ch2
Ch1
Description
The calibration of each channel is independently available to control. Each channel is working
even if a bit is set.
Bit name
Reset
Function
Chx
0: Enable reference calibration (sensing + calibration)
1: Disable reference calibration (sensing + No calibration)
0
8.9 Channel 9~12 Calibration Control Register
Cal_hold2
Channel 9 ~ 12 Calibration Enable Register
Address (hex): 0Fh
Type: R/W
Bit7
Bit6
0
0
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
0
0
Ch12
Ch11
Ch10
Ch9
Description
The calibration of each channel is independently available to control. Each channel is working
even if a bit is set.
Bit name
Reset
Function
Chx
0
0: Enable reference calibration (sensing + calibration)
1: Disable reference calibration (sensing + No calibration)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
8.10 Output Register
Output1
Channel 1 ~ 4 Output Register
Address (hex): 10h
Type: R
Bit7
Bit6
Bit5
OUT4[1:0]
Bit4
Bit3
OUT3[1:0]
Bit2
OUT2[1:0]
Bit1
Bit0
OUT1[1:0]
Description
The each channel output of TSM12 is compressed with 2 bits. It has 3 level output information
that is low, middle and high.
Bit name
Reset
Function
OUT4[1:0]
OUT3[1:0]
OUT2[1:0]
OUT1[1:0]
00
00
00
00
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
4
3
2
1
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
Output2
Address (hex): 11h
Type: R
Bit7
Bit6
Channel 5 ~ 8 Output Register
Bit5
OUT8[1:0]
Bit4
Bit3
OUT7[1:0]
Bit2
OUT6[1:0]
Bit1
Bit0
OUT5[1:0]
Description
The each channel output of TSM12 is compressed with 2 bits. It has 3 level output information
that is low, middle and high.
Bit name
Reset
Function
OUT8[1:0]
OUT7[1:0]
OUT6[1:0]
OUT5[1:0]
00
00
00
00
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
8
7
6
5
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
Output3
Address (hex): 12h
Type: R
Bit7
Bit6
Channel 9~ 12 Output Register
Bit5
OUT12[1:0]
Bit4
Bit3
OUT11[1:0]
Bit2
OUT10[1:0]
Bit1
Bit0
OUT9[1:0]
Description
The each channel output of TSM12 is compressed with 2 bits. It has 3 level output information
that is low, middle and high.
Bit name
Reset
Function
OUT12[1:0]
OUT11[1:0]
OUT10[1:0]
OUT9[1:0]
00
00
00
00
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
Output of channel
00: No output
01: low output
10: middle output
11: high output
12
11
10
9
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
9 Recommended TSM12 Initialize Flow (Example)
START
Power ON
Wait 100mS
H/W Reset
Ch1 On
Micom On
Ctrl2 Setting : 0x0F
Ctrl2 Setting : 0x07
Sensitivity
Setting?
Yes
Sensitivity Setting
Ch1 ~ CH12
No
Ctrl1 Setting ?
Yes
Ctrl1 Setting
No
Channel_Hold Off
Ch1 ~ CH12
Reset Off
CH1 ~ CH12
END
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
10 Recommended Circuit Diagram
10.1 Application Example in clean power environment
0
Pad
Pad
Pad
1
1
1
1
Pad
T4 T3 T2 T1
Pad Pad Pad Pad
RSY NC
2M
VDD
0
VDD
7
8
25
P_CDEG2
27
26
VSS
SYNC/OPT
28
VDD
29
CS1
30
CS2
INT
CS8
SDA
CS9
SCL
N.C.
OUT1
9
VDD
31
CS7
CS10
N.C.
RO5
10K
24
23
22
0
21
EN
20
I2C_EN
INT
19
INT
SDA
18
SDA
SCL
VDD
17
RO1
10K
OUT1
RST
N.C.
C_VDD
1u
RST
R_IB
20k
1
1
1
VDD
SCL
OUT1
RST
1
RO4
10K
16
6
I2C_EN
IRBIAS
1
CS6
N.C.
5
ID_SEL
ADS
TSM12
15
Pad
1
CS5
14
Pad
4
P_CDEG0
VSS
Pad
1
SRBIAS
13
Pad
3
CS12
Pad
1
12
T5
Pad
T6
Pad
T7
Pad
T8
Pad
T9
Pad
RO3
10K
VDD
P_CDEG1
CS11
2
0
RO2
10K
RBias
11
1
VDD
R_SB
2M
CS3
C_B
820p
10
R_B
510K
CS4
32
VDD
T10
Pad
Pad
Pad
Pad
0
T11 T12
Pad Pad
0
0
TSM12 Application Example Circuit (Clean power environment)
In PCB layout, R_B should not be placed on touch pattern. If not, C_B has to be connected.
The R_B pattern should be routed as short as possible.
The CS patterns also should be routed as short as possible and the width of line might be
about 0.25mm.
The capacitor that is between VDD and GND is an obligation. It should be located as close as
possible from TSM12.
The CS pattern routing should be formed by bottom metal (opposite metal of touch PAD).
The empty space of PCB must be filled with GND pattern to strengthen GND pattern and to
prevent external noise from interfere with sensing frequency.
The TSM12 is reset if RST Pin is high. (See 6.5 Reset implementation chapter)
The TSM12 is working with single output mode if the SYNC/OPT pin is high and it will be in
multi output mode when it’s low. The resistor which is connected with GND should be
connected with SYNC pin when the application is required over two TSM12 devices (Multi
output mode).
.
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
10.2 Application Example in noisy environment
Pad
Pad
1
Pad
1
1
1
Pad
T4 T3 T2 T1
Pad Pad Pad Pad
RS4 RS3 RS2 RS1
200 200 200 200
0
CS1
10p
CS2
10p
CS3
10p
RSY NC
2M
0
CS4
10p
VDD
VDD
200
6
1
RS9
200
7
CS9
CS8
CS7
CS6
CS5
10p
10p
10p
10p
10p
N.C.
8
26
27
25
P_CDEG2
VSS
SYNC/OPT
28
VDD
29
CS1
30
CS2
INT
CS8
SDA
CS9
SCL
N.C.
OUT1
0
VDD
RO5
10K
24
23
22
0
21
EN
20
I2C_EN
INT
19
INT
SDA
18
SDA
SCL
VDD
17
SCL
OUT1
RO1
10K
RST
RS8
RO4
10K
OUT1
16
1
CS7
IRBIAS
5
N.C.
200
15
RS7
I2C_EN
N.C. 14
1
ID_SEL
ADS
TSM12
CS6
VSS
4
13
200
CS12
RS6
P_CDEG0
CS5
12
1
SRBIAS
RST
RST
R_IB
20k
C_VDD
1u
VDD
0
0
CS12
10p
0
CS11
10p
CS10
10p
RS10
200
RS11
200
RS12
200
T10
Pad
1
Pad
1
0
Pad
Pad
3
CS10
Pad
200
9
Pad
RS5
1
Pad
1
Pad
Pad
RO3
10K
VDD
P_CDEG1
CS11
2
0
T5
Pad
T6
Pad
T7
Pad
T8
Pad
T9
Pad
RO2
10K
RBias
11
1
VDD
R_SB
2M
CS3
C_B
820p
10
R_B
510K
CS4
0
31
32
VDD
T11 T12
Pad Pad
TSM12 Application Example Circuit (Noisy environment)
The VDD periodic voltage ripple over 50mV and the ripple frequency is lower than 10 kHz can
cause wrong sensitivity calibration. To prevent above problem, power (VDD, GND) line of touch
circuit should be separated from other circuit. Especially LED driver power line or digital
switching circuit power line certainly should be treated to be separated from touch circuit.
The smaller R_B is recommended in noisy environments.
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
10.3 Example – Power Line Split Strategy PCB Layout
A. Not split power Line (Bad power line design)
The noise that is generated by AC load or relay can be loaded at 5V power line.
A big inductance might be appeared in case of the connection line between main board and
display board is too long, moreover the voltage ripple could be generated by LED (LCD)
display driver at VDD (5V).
B. Split power Line (One 5V regulator used) – Recommended
C. Split power Line (Separated 5V regulator used) – Strongly recommended
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
11 MECHANICAL DRAWING
11.1 TSM12 - 32QFN package
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
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TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
11.2 TSM12 - 32MLF package
NOTE: Dimensions are in millimeters
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
12 MARKING DESCRIPTION
12.1 TSM12 – 32QFN package
Device Code
: TS M12
Channel Number
Application
Touch Switch Group
Weekly Code
: YY ZZ
Manufacturing Year
Manufacturing Week
12.2 TSM12 – 32MLF package
Device Code
: T S M 1 2M
Channel Number / MLF PKG
Application
Touch Switch Group
Weekly Code
: YY WW
Manufacturing Week
Manufacturing Year
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ADSemiconductor®
TSM12 (12-CH Auto Sensitivity Calibration Capacitive Touch Sensor)
NOTES:
LIFE SUPPORT POLICY
AD SEMICONDUCTOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN
LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE
PRESIDENT AND GENERAL COUNSEL OF AD SEMICONDUCTOR CORPORATION
The ADS logo is a registered trademark of ADSemiconductor
ⓒ 2006 ADSemiconductor – All Rights Reserved
www.adsemicon.com
www.adsemicon.co.kr
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