SC200L Hardware Design
SC200L_Hardware_Design
44 / 103
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
I
O
max = 200 mA
LDO2_1V8 125 PO
1.8V output power supply
for TP I/O power
Vnorm = 1.80 V
I
O
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
