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Radxa CM3 IO GPIO Definition

GPIO Voltage

TypeVoltageTolerance
GPIO3.3V3.63V
ADC1.8V1.98V

GPIO Interface

Radxa CM3 IO provides a 40 pin GPIO socket, which is compatible with most sensor applications on the market.

Tips: The actual compatibility is subject to usage.

Radxa CM3 IO Board and Raspberry Pi CM4 IO Baseboard's 40-pin expansion header are compatible. The following pinout applies to both products:

GPIO numberFunction4Function3Function2Function1Pin#Pin#Function1Function2Function3Function4GPIO number
+3.3V
1
2
+5.0V
14PWM2_M1SPI0_MOSI_M0I2C2_SDA_M0GPIO0_B6
3
4
+5.0V
13PWM1_M1SPI0_CLK_M0I2C2_SCL_M0GPIO0_B5
5
6
GND
125I2S1_SDI3_M1GPIO3_D5
7
8
GPIO0_D1
UART2_TX_M0
25
GND
9
10
GPIO0_D0
UART2_RX_M0
24
23UART0_CTSnPWM0_M1GPIO0_C7
11
12
GPIO3_C7I2S1_SCLK_TX_M1119
15PWM0_M0GPIO0_B7
13
14
GND
19PWM4GPIO0_C3
15
16
GPIO3_D4I2S1_SDI2_M1124
+3.3V
17
18
GPIO3_D3I2S1_SDI1_M1123
138I2C4_SDA_M0I2S2_SDI_M1SPI3_MOSI_M0GPIO4_B2
19
20
GND
136I2S1_SDO1_M1SPI3_MISO_M0GPIO4_B0
21
22
GPIO3_C6I2S1_MCLK_M1118
139I2C4_SCL_M0I2S2_SDO_M1SPI3_CLK_M0GPIO4_B3
23
24
GPIO4_A6SPI3_CS0_M0I2S1_SCLK_RX134
GND
25
26
GPIO4_C5UART9_TX_M1I2S3_SDO_M1SPI3_MISO_M1
140I2C2_SDA_M1GPIO4_B4
27
28
GPIO4_B5I2C2_SCL_M1I2S1_SDO3_M1141
137I2S1_SDO2_M1GPIO4_B1
29
30
GND
21PWM6SPI0_MISO_M0GPIO0_C5
31
32
GPIO4_C0PWM11_IR_M1144
22PWM7_IRSPI0_CS0_M0GPIO0_C6
33
34
GND
120I2S1_LRCK_TX_M1GPIO3_D0
35
36
GPIO4_A7I2S1_LRCK_RX_M1135
18PWM3_IRGPIO0_C2
37
38
GPIO3_D2I2S1_SDI0_M1122
GND
39
40
GPIO3_D1I2S1_SDO0_M1121

More details about 40-pin Header In V1.1

  • Pins marked with color orange are designed for debug console.
  • PWM: x8, PWM0 / PWM1 / PWM2 / PWM3 / PWM4 / PWM6 / PWM7 / PWM11
  • SPI: x2, SPI0 / SPI3
  • I2C: x2, I2C2 / I2C4
  • UART: x1, UART2