Document
Preliminary
TTP225 TonTouchTM
8 KEYS TOUCH PAD DETECTOR IC
GENERAL DESCRIPTION
The TTP225 TonTouchTM is a touch pad detector IC with open drain output which offers 8 touch keys. The touching detection IC is designed for replacing traditional direct button key with fixed pad size. Low power consumption and wide operating voltage are the contact key features for DC or AC application.
FEATURES
Operating voltage 2.0V~5.5V Operating current typical 120uA, max 160uA at VDD=3V The output refresh rate about 85Hz at VDD=3V 64 steps sensitivity selectable (SLSE0~5 pin option) Another have offer 2 kinds of base-step (OPST pin option)
Stable touching detection of human body for replacing traditional direct switch key
Provides direct mode、matrix mode and serial mode selected by pad option
Maximum 8 input pads and 8 outputs for direct mode; Maximum 8 input pads for serial interface mode; Maximum 8 input pads provide fixed 2*4 and 3*3 matrix types
Outputs(Q0~Q7) are open drain(active low)
After power-on have 0.5~0.7sec stable-time, during the time do not touch the
key-pad, And the function is disabled.
Auto calibration for life. And the re-calibration period is 0.5~0.7sec.
When all keys do not touched.
APPLICATION Wide consumer products
Button key replacement
PACKAGE CONFIGURATION
NC2 1
48 SLSE5
NC1 2
47 SLSE4
I7 3
46 SLSE3
I6 4
45 SLSE2
NC 5
44 NC
NC 6
43 SLSE1
NC 7
42 NC
I5 8
41 SLSE0
I4 9
40 VSS
I3 10
39 DV
I2 I1 I0
11 12 13
TTP225 SSOP-48
38 37 36
Q7 Q6 Q5
OPW0 14
35 Q4
OPW1 15
34 Q3
OPT0 16
33 Q2
NC 17
32 NC
OPT1 18
31 OPST
NC 19
30 NC
NC 20
29 Q1
OSC1 21
28 Q0
VSS 22
27 TEST
VDD 23
26 NC3
OPS1 24
25 OPS0
09’/08/25
Page 1 of 15
Ver : 1.3
Preliminary
BLOCK DIAGRAM FOR DIRECT MODE :
TTP225 TonTouchTM
I0 I1 I2 I3 I4 I5 I6 I7 OSC1 TEST
SLSE0 SLSE1 SLSE2 SLSE3 SLSE4 SLSE5
Inputs Scan & Switch
Reference OSC1 Key Detection Sensor OSC2
8 Sets key
de-bounce
8 outputs selection
& driver
System timing control
Sensitivity selection
Key-on timing
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 DV
OPS0=1 OPS1=1
OPT0 OPT1
OPST OPW0 OPW1
BLOCK DIAGRAM FOR SERIAL INTERFACE MODE :
I0 I1 I2 I3 I4 I5 I6 I7 OSC1 TEST
SLSE0 SLSE1 SLSE2 SLSE3 SLSE4 SLSE5
Inputs Scan & Switch
Reference OSC1 Key Detection Sensor OSC2
8 Sets key
de-bounce
8 outputs selection
& driver
System timing control
Sensitivity selection
Key-on timing
DO(Q0)
RST(Q6) CK(Q7) DV
OPS0=1 OPS1=0
OPT0 OPT1 OPST OPW0 OPW1
09’/08/25
Page 2 of 15
Ver : 1.3
Preliminary
BLOCK DIAGRAM FOR KEY-MATRIX MODE :
I0 I1 I2 I3 I4 I5 I6 I7 OSC1 TEST
SLSE0 SLSE1 SLSE2 SLSE3 SLSE4 SLSE5
Inputs Scan & Switch
Reference OSC1 Key Detection Sensor OSC2 System timing control
8 Sets key
de-bounce
Sensitivity selection
TTP225 TonTouchTM
8 outputs selection
& driver
Key-on timing
Q0(SCN0) Q1(SCN1) Q2(SCN2) Q3(SCN3) Q4(SCN4) Q5(SCN5)
DV
OPS0=0 OPS1 (3*3 or 2*4) OPT0 OPT1
OPST OPW0 OPW1
09’/08/25
Page 3 of 15
Ver : 1.3
Preliminary
TTP225 TonTouchTM
PIN DESCRIPTION
Pin No. Pin Name Share Pin I/O Type
Pin Description
1 NC2
2 NC1
3 I7 4 I6 5 NC 6 NC 7 NC 8 I5 9 I4 10 I3 11 I2 12 I1 13 I0
I Input port I Input port I Input port I Input port I Input port I Input port I Input port I Input port
14 OPW0
I-PH OPW0~1 are option pins to select the windows of key-detected
15 OPW1
I-PH OPW0~1 are option pins to select the windows of key-detected
16 OPT0
I-PH OPT0~1 are option pins to select the time of key-on
17 NC
18 OPT1
I-PH OPT0~1 are option pins to select the time of key-on
19 NC
20 NC
21 OSC1
I/O System oscillator pin
22 VSS 23 VDD
P Negative power supply,ground P Positive power supply
24 OPS1
I-PH Output type option pin
25 OPS0
I-PH Output type option pin
26 NC3
27 TEST
I-PH Only for test,when normal function must be connected to VSS
28 Q0 (DO/SCN0) I/O/OD Q0 is open drain output pin on direct mode (active low)
DO is the shifted data output pin on serial mode (open drain)
SCN0 is the first scanning pin on matrix mode
29 Q1 (SCN1) I/O/OD Q1 is open drain output pin on direct mode (active low)
SCN1 is the second scanning pin on matrix mode
30 NC
31 OPST
I-PH Selecting the base step of sensitivity
32 NC
33 Q2 (SCN2) I/O/OD Q2 is open drain output pin on direct mode (active low)
SCN2 is the third scanning pin on matrix mode
34 Q3 (SCN3) I/O/OD Q3 is open drain output pin on direct mode (active low)
SCN3 is the fourth scanning pin on matrix mode
35 Q4 (SCN4) I/O/OD Q4 is open drain output pin on direct mode (active low) SCN4 is the fifth scanning pin on matrix mode
36 Q5 (SCN5) I/O/OD Q5 is open drain output pin on direct mode (active low) SCN5 is the sixth scanning pin on matrix mode
37
Q6
(RST)
I/OD Q6 is open drain output pin on direct mode (active low)
RST is the reset input pin on serial mode
38
Q7
(CK)
I/OD Q7 is open drain output pin on direct mode (active low)
CK is the clock input pin on serial mode
39 DV
O Data valid output signal
40 VSS
P Negative power supp.