TTP225 Datasheet, PDF (11/15 Pages) Tontek Design Technology – 8 KEYS TOUCH PAD DETECTOR IC

Preliminary
TTP225
TonTouch^TM
APPLICATION CIRCUIT
a. For direct mode
APPLICATION FOR DIRECT KEY OUTPUT MODE
KEY7
KEY6
KEY5
KEY4
KEY3
KEY2
KEY1
KEY0
VCC
+2.0 ~ +5.5V
Voltage Regulator
Vin
Vout
VSS
See P.S. : 3
C1
5~10pF
1 NC2
SLSE5 48
2 NC1
SLSE4 47
3 I7
SLSE3 46
4 I6
SLSE2 45
5
44
6
SLSE1 43
7
42
8 I5
SLSE0 41
9 I4
VSS 40
10 I3 TTP225 DV 39
11 I2 SSOP-48 Q7 38
12 I1
Q6 37
13 I0
Q5 36
14 OPW0
Q4 35
15 OPW1
Q3 34
16 OPT0
Q2 33
17
32
18 OPT1
OPST 31
19
30
20
Q1 29
21 OSC1
Q0 28
22 VSS
TEST 27
23VDD
NC3 26
24 OPS1
OPS0 25
DV
OUT_7
OUT_6
OUT_5
OUT_4
OUT_3
OUT_2
OUT_1
OUT_0
Ci
Co
C2
4.7uF
4.7uF
104
See P.S. : 6
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.
09’/08/25
Page 11 of 15
Ver : 1.3