Product Info

SC200L Hardware Design

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Figure 18: Reference Design for External Backlight Driving Circuit

3.17. Touch Panel Interface

SC200L provides one I2C interface for connection with Touch Panel (TP), and also provides the

corresponding power supply and interrupt pins. The definitions of TP interface pins are illustrated below.

Table 19: Pin Definition of Touch Panel Interface

A reference circuit for the TP interface is shown below.

Pin Name Pin No I/O Description Comment

LDO4_2V8 156 PO

2.80V output power supply

for TP VDD

Vnorm = 2.80 V

max = 200 mA

LDO2_1V8 125 PO

1.8V output power supply

for TP I/O power

Vnorm = 1.80 V

max = 500 mA

TP_INT 30 DI Interrupt signal of TP

1.85 V voltage domain

Can be used as ordinary

GPIO

TP_RST 31 DO Reset signal of TP

1.85 V voltage domain

Can be used as ordinary

GPIO

TP_I2C_SCL 47 OD I2C clock signal of TP

1.85 V voltage domain, can

be used as ordinary GPIO

without external pull-up

Can be used for other I2C

devices

TP_I2C_SDA 48 OD I2C data signal of TP