Sony HT-CT290 Service Manual page 34

HT-CT290/CT291
• IC Block Diagrams
IC4002 PST8429UL (TOUCH BOARD)
GND 1
VREF
+
–
4 OUT
VDD 2 3 CD
HT-CT290/CT291
• IC Pin Function Description
TOUCH BOARD IC4001 CY8CMBR3108-LQXIT (TOUCH KEY CONTROLLER)
Pin No. Pin Name I/O
1, 2 CS0/PS0, CS1/PS1 -
3 CMOD -
4 VCC O
5 VDDIO -
6 VDD -
7 VSS -
8 CS4/GPO0 I/O
9 CS5/GPO1 I
10 CS6/GPO2 I
11 CS7/GPO3/SH I
12 CS2/GUARD I
13 CS3 I
14 I2C_SDA I/O
15 I2C_SCL I/O
16 HI/BUZ O
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Description
Fixed at "L" in this unit
External capacitor connection terminal
Internal regulator output terminal
Power supply terminal (+3.3V)
Power supply terminal (+3.3V)
Ground terminal
Touch key input/output terminal Not used
VOL + touch key input terminal
VOL – touch key input terminal
PAIRING touch key input terminal
INPUT touch key input terminal
Power touch key input terminal
Two-way I2C serial data bus with system controller
Two-way I2C serial data transfer clock signal bus with system controller
Interrupt signal output to the system controller