Quectel SC20 Series - Touch Panel Interface

Smart Module Series
SC20_Series_Hardware_Design 58 / 133
3.19. Touch Panel Interface
SC20 series provides an I2C interface for connection with Touch Panel (TP), and it also provides the
corresponding power supply and interrupt pins. The pin definition of TP interface is illustrated below.
Table 23: Pin Definition of Touch Panel Interface
The following illustrates a TP interface reference circuit, by taking the connection with TP interface of
LHR050H41-00 (IC: GT9147) from HUARUI Lighting as an example.
TP_RST
TP_I2C_SCL
TP_I2C_SDA
TP_INT
1
2
3
4
5
6
2.2K
2.2K
LDO17_2V85
LDO6_1V8
4.7 μF
100 nF
Module
RESET 1.8 V
SCL 1.8 V
SDA 1.8 V
INT 1.8 V
GND
VDD 2.8 V
TP
R2
R1
C1 C2
D1 D2
D3
D4
D5
Figure 23: Reference Circuit Design for TP Interface
Pin Name Pin No. I/O Description Comment
LDO6_1V8 125 PO
1.8 V output power supply for
TP I/O power domain and I2C
pull-up circuit
Vnom = 1.8 V
I
O
max = 100 mA
LDO17_2V85 129 PO
2.85 V output power supply
for TP VDD
Vnom = 2.85 V
I
O
max = 300 mA
TP_INT 30 DI TP interrupt 1.8 V power domain.
TP_RST 31 DO TP reset
1.8 V power domain.
Active low.
TP_I2C_SCL 47 OD TP I2C clock 1.8 V power domain.
TP_I2C_SDA 48 OD TP I2C data 1.8 V power domain.