Touch Panel Interface - Quectel SC200L-EM Hardware Design

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
Pin Name Pin No
LDO4_2V8 156
LDO2_1V8 125
TP_INT 30
TP_RST 31
TP_I2C_SCL 47
TP_I2C_SDA 48
A reference circuit for the TP interface is shown below.
SC200L_Hardware_Design
I/O Description
2.80V output power supply
PO
for TP VDD
1.8V output power supply
PO
for TP I/O power
DI Interrupt signal of TP
DO Reset signal of TP
OD I2C clock signal of TP
OD I2C data signal of TP
SC200L Hardware Design
Comment
Vnorm = 2.80 V
I max = 200 mA
O
Vnorm = 1.80 V
I max = 500 mA
O
1.85 V voltage domain
Can be used as ordinary
GPIO
1.85 V voltage domain
Can be used as ordinary
GPIO
1.85 V voltage domain, can
be used as ordinary GPIO
without external pull-up
Can be used for other I2C
devices
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