Preliminary

TTP225

09’/08/25

Page 11 of 15

Ver : 1.3

APPLICATION CIRCUIT

a. For direct mode

APPLICATION FOR DIRECT KEY OUTPUT MODE

Voltage Regulator

+2.0 ~ +5.5V

Vout

Vin

VSS

TTP225

NC2

NC1

NC3

TEST

SSOP-48

SLSE1

SLSE5

SLSE4

SLSE3

SLSE2

OPST

OPT1

OPT0

OPW1

OPW0

SLSE0

VSS

DV

Q7

Q6

Q5

Q4

Q3

Q2

Q1

Q0

OPS0

OPS1

VDD

VSS

OSC1

I0

I1

I2

I3

I4

I5

I6

I7

1

10

11

12

13

14

15

16

17

18

19

2

20

21

22

23

24

25

26

27

28

29

3

30

31

32

33

34

35

36

37

38

39

4

40

41

42

43

44

45

46

47

48

5

6

7

8

9

See P.S. : 6

4.7uF

Ci

VCC

Co

4.7uF

C2

104

See P.S. : 3

C1

5~10pF

DV

OUT_7

OUT_6

OUT_5

OUT_4

OUT_3

OUT_2

OUT_1

OUT_0

KEY7

KEY6

KEY5

KEY4

KEY3

KEY2

KEY1

KEY0

P.S.：1. On PCB, the length of lines from touch pad to IC pins are best the same with K0 to K7.

And the lines do not parallel and cross with other lines.

2. The power supply must be stable. If the supply voltage drift or shift quickly, maybe causing

sensitivity anomalies or false detections.

3. On OSC1 pin adding the C1 capacitor can adjust the system frequency, it will affect the output

refresh rate, power-on stable-time, DV pulse width, and key-on duration time.

4. The material of panel covering on the PCB can not include the metal or the electric element.

The paints on the surfaces are the same.

5. The C2 capacitor must be used between VDD and VSS; and should be routed with very short

tracks to the device’s VDD and VSS pins (TTP225).

6. The value of capacitors can be used by the real application for Ci and Co capacitors.