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Rock3/hardware/3a


    ROCK 3 >  Hardware >  ROCK 3 A Main Board

ROCK 3 A Main Board

This hardware user manual provides information about the features and signals available on ROCK 3 A board.

Rock-3-a-with-label.jpg

1.Power Button

The power button is used to turn the device on and off.

Short pressing power button would turn on/off the device.

3.MIPI Display Interface

The ROCK Pi 4 Model A and B are equipped with one HDMI connector and one MIPI DSI. As for HDMI, the maximum resolution is 4k@60Hz. Any HDMI monitor should work as a display for the Pi 4. As for MIPI DSI, it is designed for raw LCD pannel. HDMI and MIPI DSI can work at the same time.

The MIPI DSI interface pin specification shows below.

Pin# Name
1 VCC_MIPI
2 VCC_MIPI
3 GND
4 I2C_SDA_AUDIO
5 I2C_SCL_AUDIO
6 GND
7 MIPI_TX/RX_D0P
8 MIPI_TX_RX_D0N
9 GND
10 MIPI_TX/RX_CLKP
11 MIPI_TX_RX_CLKN
12 GND
13 MIPI_TX/RX_D1P
14 MIPI_TX/RX_D1N
15 GND

7.Power Supply

The ROCK 3A is powered by Type-C port and has a wide range of input voltage, from 9V to 21V. The ROCK 3A supports USB Type-C PD 2.0 with 9V/2A, 12V/2A, 15V/2A and 20V/2A. Besides, the Pi supports QC 3.0/2.0 with 9V/2A and 12V/1.5A. The Type-C cable you using needs to support data communication. We call it USB Type-C charging data cable.

9.HDMI

The ROCK 3A is equipped with one HDMI connector and one MIPI DSI. As for HDMI, the maximum resolution is 4k@60Hz. Any HDMI monitor should work as a display for the ROCK 3A. As for MIPI DSI, it is designed for raw LCD pannel. HDMI and MIPI DSI can work at the same time.

HDMI port supports Consumer Electronics Control (CEC) function. Using ROCK 3A connected to a TV that supports CEC, you can use the command line cec-client application to control the inputs and the TV itself.

The HDMI interface pin specification shows below.

Pin# Name
1 HDMI_TX2P
2 GND
3 HDMI_TX2N
4 HDMI_TX1P
5 GND
6 HDMI_TX1N
7 HDMI_TX0P
8 GND
9 HDMI_TX0N
10 HDMI_TXCP
11 GND
12 HDMI_TXCN
13 HDMI_CEC
14 NC
15 DDC_SCL
16 DDC_SDA
17 GND
18 VCC5V0_HDMI
19 PORT_HPD

10.MIPI Camera Interface

There is a wide range of camera applications in our lives. MIPI CSI 2 lane on board support 800 MP camera via FPC connector.

The MIPI CSI interface pin specification shows below.

Pin# Name
1 VCC_CAM
2 I2C4_SDA
3 I2C4_SCL
4 CAM_MCLK
5 CAM_GPIO1
6 GND
7 MIPI_RX0_CLKP
8 MIPI_RX0_CLKN
9 GND
10 MIPI_RX0_D1P
11 MIPI_RX0_D1N
12 GND
13 MIPI_RX0_D0P
14 MIPI_RX0_D0P
15 GND

11.Audio: 3.5mm jack with MIC

Audio can be played through speaker or headphones using a standard 3.5mm jack with MIC.

Note that HD codec supports up to 24-bit/96KHz audio.

12.PWM Fan

Rock-3a-pwm-fan-connector.png

Definition table (From top to bottom in the picture)

Pin# Name
1 +5.0V
2 PWM
3 GND

13.1000M Ethernent

14/15/21.USB

One Type-A USB 3.0 port with OTG switch, the upper one on USB 3.0 port

When the USB OTG Switch is switched to the host side, the Type-A USB 3.0 port also enables the attachment of peripherals such U Disk, keyboards, mice, USB dongle etc.

This USB 3.0 port supports On-The-Go(OTG) when the USB OTG Switch is switched to the device side. Thus the Soc is recognized as an device.

Take adb as an example. You can use a Type-A to Type-A cable as a bridge between you PC and ROCK 3A Board. In addition to the system configuration, you can setup the adb tool on your PC to access ROCK 3A over adb.

One Type-A USB 3.0 host port

Tthe Type-A USB 3.0 port enables the attachment of peripherals such U Disk, keyboards, mice, USB dongle etc.

Two Type-A USB 2.0 host port

These two ports enables the attachment of peripherals such U Disk, keyboards, mice, USB dongle etc.

One USB 2.0 signal on 40-pin header

According to the ROCK 3A SKU table, there are two USB 2.0 signal lines on 40-pin header, PIN 27&28.

When you want to select this USB function, you need to modify the hardware like this.

  • Remove R90526 R90527
  • Add R90536 R90537

16.PoE

17.SoC

SoC is RK3568.

20.General purpose input-output (GPIO) connector

ROCK 3A has one 40-pin expansion header. Each pin is distinguished by color.

For more details, see the ROCK 3A GPIO page.

22.RTC

The RTC connector is designed according to the standard connector type.

You can distinguish '+3.3V' and '-' from the silk screen on the board.

Pin# Name
1 GND
2 +3.3V

23.PCIE M.2 NGFF M-KEY SOCKET Interface

On ROCK 3A board, M.2 connector supports up to 2T M2 NVME SSD.

The PCIE M.2 interface pin specification shows below.

Name Pin# Pin# Name
GND 1 2 +3.3V
GND 3 4 +3.3V
PERn3 5 6 NC
PERp3 7 8 NC
GND 9 10 DAS/DSS#
PETn3 11 12 +3.3V
PETp3 13 14 +3.3V
GND 15 16 +3.3V
PERn2 17 18 +3.3V
PERp2 19 20 EMMC_CMD
GND 21 22 NC
PETn2 23 24 NC
PETp2 25 26 NC
GND 27 28 NC
PERn1 29 30 NC
PERp1 31 32 NC
GND 33 34 NC
PETn1 35 36 NC
PETp1 37 38 DEVSLP
GND 39 40 NC
PERn0/SATA-B+ 41 42 NC
PERp0/SATA-B- 43 44 NC
GND 45 46 NC
PETn0/SATA-A- 47 48 NC
PETp0/SATA-A+ 49 50 PERST#
GND 51 52 CLKREQ#
REFCLKN 53 54 PEWake#
REFCLKP 55 56 NC
GND 57 58 NC
NC 67 68 SUSCLK
PEDET 69 70 +3.3V
GND 71 72 +3.3V
GND 73 74 +3.3V
GND 75

24.TF Card Interface

The TF card can be used as a system storage or an external storage. When it's used as a system storage, you had better choose the ones with storage space larger than 8GB. When it's used as an external storage, you can choose the ones with storage space up to 128GB. When the TF card is inserted into the TF card slot , the device will be automatically recognized by the system.

The TF card interface pin specification shows below.

Pin# Name
1 SDMMC0_D2
2 SDMMC0_D3
3 SDMMC0_CMD
4 VCC3V3_SYS
5 SDMMC0_CLK
6 GND
7 SDMMC0_D0
8 SDMMC0_D1
9 SDMMC0_DET_L
10 GND
11 GND
12 GND
13 GND

26. eMMC

Socket on Board Interface Feature

The high performance eMMC module is the best choice as the system storage for ROCK 3A. The eMMC module with 8GB/16GB/32GB/64GB/128GB is available.

The eMMC Socket pin specification shows below.

Name Pin# Pin# Name
GND 1 34 GND
EMMC_D5 2 33 EMMC_D6
GND 3 32 GND
EMMC_D4 4 31 EMMC_D7
GND 5 30 GND
EMMC_D0 6 29 EMMC_D1
GND 7 28 GND
EMMC_CLK 8 27 EMMC_D2
GND 9 26 GND
EMMC_D3 10 25 EMMC_CMD
GND 11 24 GND
EMMC_RSTN 12 23 VCC3V3_SYS
GND 13 22 VCC3V3_SYS
GND 14 21 VCC_1V8
EMMC_RCLK 15 20 VCC_1V8
GND 16 19 GND
GND 17 18 GND