radxa_cm3.md

Radxa CM3 {#_Radxa}

The Radxa CM3 is a System on Module (SoM) based on the Rockchip RK3566 System on Chip (SoC). CM3 integrates the Central Process Unit (CPU), Power Management Unit (PMU), DRAM memory, flash storage and wireless connectivity (WiFi 5 and BT 5.0) in a small form factor of just 55mm x 40mm. CM3 uses 3x 100P 0.4mm-pitch Board-to-Board connectors to export various features, and can be combined with the customer's baseboard to build complete products, thereby speeding up the research and development process. Currently, CM3 is compatible with Radxa CM3 IO Board and Raspberry Pi CM4 IO Board.

Interface notes

• UART2 is enabled as the default console.
• All UART ports support baud up to 1500000.

Pin Mapping

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

Function3	Function3	Function2	Function1	PIN	PIN	Function1	Function2	Function3
			3V3	1	2	+5.0V
PWM2_M1	SPI0_MOSI_M0	I2C2_SDA_M0	GPIO0_B6	3	4	+5.0V
PWM1_M1	SPI0_CLK_M0	I2C2_SCL_M0	GPIO0_B5	5	6	GND
			GPIO3_D5	7	8	GPIO0_D1	UART2_TX_M0
			GND	9	10	GPIO0_D0	UART2_RX_M0
		PWM0_M1	GPIO0_C7	11	12	GPIO3_C7
		PWM0_M0	GPIO0_B7	13	14	GND
		PWM4	GPIO0_C3	15	16	GPIO3_D4
			+3.3V	17	18	GPIO3_D3
	I2C4_SDA_M0	SPI3_MOSI_M0	GPIO4_B2	19	20	GND
		SPI3_MISO_M0	GPIO4_B0	21	22	GPIO3_C6
	I2C4_SCL_M0	SPI3_CLK_M0	GPIO4_B3	23	24	GPIO4_A6	SPI3_CS0_M0
			GND	25	26	GPIO4_C5	UART9_TX_M1	SPI3_MISO_M1
		I2C2_SDA_M1	GPIO4_B4	27	28	GPIO4_B5	I2C2_SCL_M1
			GPIO4_B1	29	30	GND
	PWM6	SPI0_MISO_M0	GPIO0_C5	31	32	GPIO4_C0	UART5_TX_M1
	PWM7_IR	SPI0_CS0_M0	GPIO0_C6	33	34	GND
			GPIO3_D0	35	36	GPIO4_A7	SPI3_CS1_M0
		PWM3_IR	GPIO0_C2	37	38	GPIO3_D2
			GND	39	40	GPIO3_D1

Supports

You can find additional product support in the following channels:

• Product Info
• Forums
• Github