Waveshare 3.2inch Touch LCD Screen

PIN NO.

SYMBOL

DESCRIPTION

FUNCTION

1

5V

5V power supply

When powered from 5V supply, 
Pin 1 & Pin 2 as power input,
Pin 33 & Pin 34 provide 3.3V output.

2

GND

Ground

GND

3

D0

Data pin

D0-D15

4

D1

5

D2

6

D3

7

D4

8

D5

9

D6

10

D7

11

D8

12

D9

13

D10

14

D11

15

D12

16

D13

17

D14

18

D15

19

CS

LCD chip select

Low active

20

RS

Instruction/Data register selection

RS = 1 : Data Register
RS = 0 : Instruction Register

21

WR

Write

WR = 0, RD = 1

22

RD

Read

WR = 1, RD = 0

23

RESET

Reset the controller chip

Low active

24

NC

Not connect

Not connect

25

BLVCC

5V or 3.3V

Backlight VCC

26

BLGND

Ground

Backlight GND

27

BLCNT

Backlight brightness adjustment

Control the backlight brightness via PWM

28

TP_IRQ

Touch screen interrupt

Low level while the touch screen detects pressing

29

TP_CS

Touch screen chip select

Low active

30

TP_SCK

Touch screen SPI clock

connects to SPI SCK

31

TP_SI

Touch screen data input

connects to SPI MOSI

32

TP_SO

Touch screen data output

connects to SPI MISO

33

3.3V

3.3V power supply

When powered from 3.3V supply, 
Pin 33 & Pin 34 as power input,
Pin 1 & Pin 2 keep NC.

34

GND

Ground