Radxa · Single-board computer

Radxa ROCK 5B

RK3588S octa-core board with a Raspberry-Pi-shaped 40-pin header. The holes line up; almost nothing else does.

Cheat sheet (SVG)

Logic level: 3.3 V GPIO, 1.8 V ADC
Package: 2x20 2.54 mm header

1.Pinout diagram

Highlight a signalhover to preview, click to keep

Odd pins

ROCK 5B

Even pins

Pin detail

Hover a pin for its mappings and gotchas. Click to keep it here.

Logic level: 3.3 V GPIO, 1.8 V ADC
Package: 2x20 2.54 mm header

Fig. 1. Radxa ROCK 5B, 2x20 2.54 mm header. Hover or tap a signal to light up every pin that carries it.

2.Watch out

Pin 22 is an analog input with a 1.8 V ceiling, where a Raspberry Pi has GPIO25. Any HAT that drives pin 22 at 3.3 V will damage it. This is the most dangerous difference between the two headers.
Power and ground land in the Raspberry Pi positions, so a HAT will power up. Everything else is Rockchip's own mapping and no Pi GPIO number means anything here.
Pin names are GPIO<bank>_<group><index>. The sysfs number is bank x 32 plus group x 8 plus index, with A=0 and D=3, so GPIO4_B3 is 139. Nothing in Pi tutorials translates.
The _M0, _M1, _M2 suffixes in Rockchip's documentation are mux variants: the same peripheral can appear on several pin groups, and which one is live depends on the device tree overlay. A pin listing SPI1_MOSI_M1 only does that once the matching overlay is enabled.
Pins 29 and 31 differ between the ROCK 5B and the ROCK 5B+. The 5B+ has GPIO1_A3 and GPIO1_A2 there, carrying I2C4 and PWM0/1 instead.
GPIO is 3.3 V with an absolute maximum of 3.63 V, so there is very little headroom. Nothing on the header is 5 V tolerant.
Software support is the real cost against a Raspberry Pi. Vendor kernels, fewer overlays, and far less of the internet has hit your problem before.

3.Full pin reference

Every pin, alias and mapping. This is the table that prints.

Table 1. Pin assignments.

Complete pin reference for Radxa ROCK 5B
Pin	Name	Also called	Functions	Notes
1	3V33.3 V	-	3.3 V supply out
2	5V5 V	-	5 V supply out
3	GPIO4_B3I²CUARTPWM	sysfs 139	I2C7 SDA, I2S1 SDO2, UART8 CTS, PWM15
4	5V5 V	-	5 V supply out
5	GPIO4_B2I²CUARTPWM	sysfs 138	I2C7 SCL, I2S1 SDO1, UART8 RTS, PWM14
6	GND	-	Ground
7	GPIO3_C3SPII²CUARTPWM	sysfs 115	SPI1 CS1, I2C8 SDA, UART7 CTS, PWM15
8	GPIO0_B5UARTI²C	sysfs 13	UART2 TX, I2C1 SCL, I2S1 MCLK
9	GND	-	Ground
10	GPIO0_B6UARTI²C	sysfs 14	UART2 RX, I2C1 SDA, I2S1 SCLK
11	GPIO3_C1SPIUARTClock	sysfs 113	SPI1 CLK, UART7 RX
12	GPIO3_B5PWMUART	sysfs 109	PWM12, UART3 TX, I2S2 SCLK
13	GPIO3_B7SPII²C	sysfs 111	SPI1 MOSI, I2C3 SCL
14	GND	-	Ground
15	GPIO3_C0SPII²CUART	sysfs 112	SPI1 MISO, I2C3 SDA, UART7 TX
16	GPIO3_A4	sysfs 100	GPIO only
17	3V33.3 V	-	3.3 V supply out
18	GPIO4_C4PWMSPI	sysfs 148	PWM5, SPI3 MISO
19	GPIO1_B2SPIUART	sysfs 42	SPI0 MOSI, UART4 RX
20	GND	-	Ground
21	GPIO1_B1SPI	sysfs 41	SPI0 MISO
22	SARADC_IN41.8 V maxADC	-	ADC input 4	1.8 V MAXIMUM, absolute max 1.98 V. A Raspberry Pi has GPIO25 here, so a HAT that drives pin 22 will destroy this input.
23	GPIO1_B3SPIUARTClock	sysfs 43	SPI0 CLK, UART4 TX
24	GPIO1_B4UARTSPI	sysfs 44	UART7 RX, SPI0 CS0
25	GND	-	Ground
26	GPIO1_B5UARTSPI	sysfs 45	UART7 TX, SPI0 CS1
27	GPIO4_C6SPII²CPWMClock	sysfs 150	SPI3 CLK, I2C0 SDA, PWM7
28	GPIO4_C5PWMI²CSPI	sysfs 149	PWM6, I2C0 SCL, SPI3 MOSI
29	GPIO1_D7UARTPWM	sysfs 63	UART1 CTS, PWM15	Differs on the ROCK 5B+, which has GPIO1_A3 (I2C4 SCL, PWM1) here.
30	GND	-	Ground
31	GPIO1_B7UARTPWM	sysfs 47	SPDIF TX, UART1 RX, PWM13	Differs on the ROCK 5B+, which has GPIO1_A2 (I2C4 SDA, PWM0) here.
32	GPIO3_C2PWMUARTI²CSPI	sysfs 114	PWM14, UART7 RTS, I2C8 SCL, SPI1 CS0
33	GPIO3_A7PWM	sysfs 103	PWM8
34	GND	-	Ground
35	GPIO3_B6UARTPWM	sysfs 110	I2S2 LRCK, UART3 RX, PWM13
36	GPIO3_B1PWMUART	sysfs 105	PWM2, UART2 TX
37	GPIO0_A0	sysfs 0	GPIO only
38	GPIO3_B2PWMUART	sysfs 106	PWM3, UART2 RX, I2S2 SDI
39	GND	-	Ground
40	GPIO3_B3UART	sysfs 107	UART2 RTS, I2S2 SDO

Primary sources

Radxa ROCK 5B hardware interface ↗

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