Pinouts & Connectors

DSI Connector Types

The Raspberry Pi ecosystem uses two DSI connector sizes:

Connector	Pin Count	Pitch	Used By
Standard	15-pin	1.0mm	Pi 4B, 3B+, 3B, 3A+
Compact	22-pin	0.5mm	Pi 5, CM5, CM4, CM3+, Zero

15-Pin DSI Connector (Pi 3/4)

Used on Raspberry Pi 4B, 3B+, 3B, 3A+:

Pin	Signal	Description
1	GND	Ground
2	DSI_D1_N	Data Lane 1 Negative
3	DSI_D1_P	Data Lane 1 Positive
4	GND	Ground
5	DSI_CLK_N	Clock Negative
6	DSI_CLK_P	Clock Positive
7	GND	Ground
8	DSI_D0_N	Data Lane 0 Negative
9	DSI_D0_P	Data Lane 0 Positive
10	GND	Ground
11	SCL	I2C Clock
12	SDA	I2C Data
13	GND	Ground
14	NC	Not Connected
15	3.3V	Logic Power

Note

The 15-pin connector supports 2 data lanes (D0 and D1). This is sufficient for the 800×1280 resolution at 60Hz.

22-Pin DSI/CSI Connector (Pi 5/CM)

Used on Raspberry Pi 5, CM5, CM4, CM3+, and Zero:

The 22-pin connector is bidirectional and can function as either DSI (display) or CSI (camera). Key characteristics:

• 4 data lanes (vs 2 on 15-pin)
• Bidirectional D-PHY lines
• CAM_GPIO for additional control
• I2C for touch controller communication

Note

For the exact 22-pin pinout, refer to the CM4IO Datasheet, page 10.

GPIO Assignments (Pi 5)

Port	GPIO for Control
DISP0	RP1 GPIO 34
DISP1	RP1 GPIO 46

Power Connector

The display has a separate 2-pin power connector that must be connected to the GPIO header:

Display Pin	GPIO Header	Function
+ (Red)	Pin 2 or 4	5V Power
- (Black)	Pin 6, 9, 14, etc.	Ground

GPIO Header Reference

           3.3V [1]  [2] 5V  ← Use for display power
     GPIO2/SDA [3]  [4] 5V  ← Or here
     GPIO3/SCL [5]  [6] GND ← Ground
          ...

Danger

Never connect 5V to 3.3V pins. The display requires 5V power - connecting to 3.3V will not damage it but the display won’t work.

Cable Insertion

FFC Cable (22-pin)

1. Pull the locking tab forward (away from the board)
2. Insert cable with metal contacts facing you
3. Push locking tab back to secure

Caution

The 22-pin FFC cable connects in opposite direction on each end. Contacts face opposite ways at display and Pi.

DSI Ribbon (15-pin)

1. Lift the locking tab upward
2. Insert cable with blue side facing the USB ports
3. Press locking tab down firmly

Signal Voltages

Signal Type	Voltage Levels
MIPI D-PHY LP	0V and 1.2V
MIPI D-PHY HS	100mV and 300mV
I2C	3.3V
GPIO	3.3V

Touch Controller I2C

The GT9271 touch controller communicates via I2C:

Parameter	Value
I2C Address	0x14 or 0x5D
Bus	DSI I2C (not GPIO I2C)
Speed	Standard (100kHz)

Verify touch controller detection:

i2cdetect -y 10  # DSI I2C bus