Touch Pad - LG KF510C Service Manual

3. TECHNICAL BRIEF

3.18 Touch PAD

Touch operation is divided to two parts. One is Touch Sensor, the other is LED Controller.
If touch is detected, LED is operated with scenario.
3.18.1 Touch Sensor Operation
Cypress CY8C20434 chip is used for Touch IC on KF510. CY8C20434 device includes a dedicated
CapSense block that provides sensing and scanning control circuitry for capacitive sensing pplications.
This is communicated with I2C & Interrupt to BB(S-Gold3).
Touch Communication(I2C & Interrupt) Interface Configuration and is as follow :
- VCC : 3.3V
- SDA : Data
- SCL : Clock (up to 400kHz)
- INT : Interrupt
- GND : Ground
Touch Debug
LGE Internal Use Only
C622 C623 C624 C625
2.2u 2.2u 2.2u 2.2u
TP600
C604
0.01u
1
SEN0 P0_1
2
SEN1 P2_7
3
SEN2 P2_5
4
SEN3 P2_3
5
SEN4 P2_1
6
P3_3
R635 DNI
7
P3_1
8
P1_7
SCL
SDA
Figure 27 Touch sensor control
3V3_TCH
FB601
C601
2.2u
24
P0_0 SEN13
23
P2_6 SEN12
22
U602 P2_4 SEN11
21
CY8C20434 P2_2 SEN10
20
P2_0 SEN9
19
P3_2 SEN8
18
P3_0 SEN7
17
XREX TCH_RESET
SEN5
R636 1K
MICOM_INT
R637 1K
R638 1K
Copyright © 2008 LG Electronics. Inc. All right reserved.
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I2C_SDA_TCH
I2C_CLK_TCH
Only for training and service purposes