Radxa ROCK 3C User Manual
4.2 GPIO Voltage
GPIO
Voltage Level
Tolerance
All GPIO
3.3V
3.63V
5 Peripherals
5.1 GPIO Interface
Radxa ROCK 3C offers 40P GPIO expansion which is compatible with most accessories on
the market.
5.1.1 GPIO Alternate Functions
Function5
Function4
Function3
Function2
Function1
Pin#
Pin#
Function1
Function2
Function3
Function4
Function5
+3.3V
1
2
+5.0V
I2C3_SDA_M0
UART3_RX_M0 GPIO1_A0
3
4
+5.0V
I2C3_SCL_M0
UART3_TX_M0 GPIO1_A1
5
6
GND
PWM14_M0
GPIO3_C4
7
8
GPIO0_D1
UART2_TX_M0
GND
9
10
GPIO0_D0
UART2_RX_M0
GPIO3_A1
11
12
GPIO3_A3
I2S3_SCLK_M0
I2S3_MCLK_M0
GPIO3_A2
13
14
GND
GPIO3_B0
15
16
GPIO3_B1
UART4_RX_M1 PWM8_M0
+3.3V
17
18
GPIO3_B2
UART4_TX_M1 PWM9_M0
PWM15_IR_M1 I2S3_SCLK_M1
SPI3_MOSI_M1 GPIO4_C3
19
20
GND
UART9_TX_M1 PWM12_M1
I2S3_SDO_M1
SPI3_MISO_M1 GPIO4_C5
21
22
GPIO3_C1
I2S1_SDO2_M2
PWM14_M1
I2S3_MCLK_M1
SPI3_CLK_M1 GPIO4_C2
23
24
GPIO4_C6
SPI3_CS0_M1 PWM13_M1 UART9_RX_M1 I2S3_SDI_M1
GND
25
26
GPIO4_D1
SPI3_CS1_M1
I2C4_SDA_M0
I2S2_SDI_M1
GPIO4_B2
27
28
GPIO4_B3
I2C4_SCL_M0 I2S2_SDO_M1
GPIO3_B3
29
30
GND
GPIO3_B4
31
32
GPIO3_C2
UART5_TX_M1
I2S1_SDO3_M2
UART5_RX_M1
I2S1_SCLK_RX_M2
GPIO3_C3
33
34
GND
I2S3_LRCK_M0
GPIO3_A4
35
36
GPIO3_A7
I2S1_SCLK_RX_M0
GPIO1_A4
37
38
GPIO3_A6
I2S3_SDI_M0
GND
39
40
GPIO3_A5
I2S3_SDO_M0
5.2 eMMC Module Connector
ROCK 3C offers a high speed eMMC socket for eMMC modules which can be used for OS and
data storage. The eMMC socket is compatible with readily available industrial pinout and
Radxa Computer
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