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ROCK 3 > Hardware > ROCK 3 Model A Main Board

Contents

ROCK 3 Model A Main Board

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

1.Power Button

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

Short-pressing power button would power on/off the device. This is what we called power on/off via software.

Power button also provides function of hardware power on/off the device.

When the system is crashed, you can shutdown the device via this method. Press and hold the power button for at least 6 seconds. Then release the power button. After that short press power button would power on the device.

2.3-pin Recovery Header

This is the 3-pin definition table.

Pin# Name
1   FSPI_CLK  
2   GND  
3   RECOVERY  
About FSPI_CLK pin

Short-circuit the FSPI_CLK pin and GND pin to make SPI Nor flash unavailable.

Please note that you should short-circuit pin#1 and pin#2 always when spi nor flash is not used. Like the yellow left hat.

About Recovery pin

Short-circuit Recovery pin and GND pin to boot device into loader mode.

Below is the steps of booting device into loader mode.

Install Linux/Android image(or at least u-boot images included) to SPI Nor flash or eMMC on board

Short-circuit pin#2 and pin#3

Plug the USB Male A to Male A cable to ROCK 3A OTG port(the upper USB3.0 port), the other side to PC

Plug in the Type-C adapter

Wait for about 5 seconds

Confirm ROCK 3A is in loader mode

For Linux PC: lsusb shows: Bus 001 Device 049: ID 2207:350a Fuzhou Rockchip Electronics Company For macOS PC: lsusb shows: Bus 000 Device 004: ID 2207:350a Fuzhou Rockchip Electronics Co., Ltd. USB download gadget For Windows PC: Open RKDevTool and you would see "Found One LOADER Device".

Remove wire between pin#2 and pin#3 before flashing images to boot device.

3.MIPI Display Interface

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 ROCK 3A. 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  
4.M.2 E Key

M.2 E Key pin signal definition table.

Pin# Name
1   GND  
2   VCC3V3_WF  
3   USB2_M2_DP  
4   VCC3V3_WF  
5   USB2_M2_DM  
6   WIFI_LED  
7   GND  
8   PCM_CLK/I2S_SCK  
9   SDIO_CLK  
10   PCM_SYNC/I2S_WS  
11   SDMMC2_CMD_M0  
12   PCM_OUT/I2S SD_OUT  
13   SDMMC2_D0_M0  
14   PCM_IN/I2S SD_IN  
15   SDMMC2_D1_M0  
16   NC  
17   SDMMC2_D2_M0  
18   GND  
19   SDMMC2_D3_M0  
20   BT_WAKE_HOST_H_GPIO4_B4  
21   WIFI_WAKE_HOST_H_GPIO3_D5  
22   UART1_RX_M0  
23   WIFI_REG_ON_H_GPIO3_D4  
32   UART1_TX_M0  
33   GND  
34   UART1_CTS_M0  
35   PCIE_TXP  
36   UART1_RTS_M0  
37   PCIE_TXN  
38   NC  
39   GND  
40   NC  
41   PCIE20_RXP  
42   BT_REG_NO  
43   PCIE20_RXN  
44   NC  
45   GND  
46   NC  
47   PCIE20_REFCLKP  
48   NC  
49   PCIE20_REFCLKN  
50   WIFIBT_32KIN_1T1R  
51   GND  
52   PCIE_PERSTN  
53   PCIE_CLKREQN  
54   HOST_WAKE_BT_H  
55   PCIE_WAKEN  
56   BT_REG_ON_H  
57   GND  
58   I2C4_SDA_M1  
59   NC  
60   I2C4_SCL_M1  
61   NC  
62   NC  
63   GND  
64   NC  
65   NC  
66   NC  
67   NC  
68   NC  
69   GND  
70   BT_WAKE  
71   NC  
72   VCC3V3_WF  
73   NC  
74   VCC3V3_WF  
75   GND  
76   GND  
77   GND  
78   NC  
79   NC  

M.2 E-Key slot supports the following WiFi/BT cards (include but not as least).

Model Chip WiFi BT Others
ROCK Pi Wireless Module A1(SDIO+UART)   BCM43436B0   2.4G   4.2    
ROCK Pi Wireless Module A2(SDIO+UART)   BCM43456   2.4G&5G   5.0    
ROCK Pi Wireless Module A3(SDIO+UART)   BCM43598   2.4G&5G   5.0   Support RSDB  
ROCK Pi Wireless Module A6(SDIO+UART)   BCM43752   2.4G&5G, WiFi 6   5.0    
Realtek RTL8723BE(PCIe)   RTL8723BE   2.4G   4.0    
Realtek RTL8822CE(PCIe)   RTL8822CE   2.4G&5G   5.0    
Intel 0MHK36(PCIe+USB)   Intel 3165   2.4G&5G   4.2    
Intel 7265NGW(PCIe+USB)   Intel 7265   2.4G&5G   4.2    
5.Power LED

Green power LED is always on when ROCK 3A is given power.

6.User LED

Blue user LED can be controlled via software. You can indicate the status of system application by controlling its working behavior.

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.

8.External Power

The voltage of external power is DC 12V.

9.HDMI

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

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

Definition table (From top to bottom in the picture)

Pin# Name
1   +5.0V  
2   PWM  
3   GND  
13.1000M Ethernet

ROCK 3A has one 1GbE LAN port.

1GbE LAN port LED status and speed table.

LED speed
Yellow   1000M  
Green   100M  
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

ROCK Pi 23W PoE HAT could power on ROCK 3A.

17.SoC

SoC is RK3568.

18: MASKROM MODE

This is the 2-pin definition table.

Pin# Name
1   EMMC_CLKOUT  
2   GND  

Short-circuit the EMMC_CLKOUT pin and GND pin to make eMMC unavailable.

One of the following behavior would boot ROCK 3A into MASKROM mode.

Remove SD card + remove eMMC + remove SPI Nor Flash on board

Remove SD card + remove eMMC + SPI Nor Flash is on board + short-circuit the FSPI_CLK pin and GND pin

Remove SD card + insert eMMC + short-circuit the EMMC_CLKOUT pin and GND pin + SPI Nor Flash is on board + short-circuit the FSPI_CLK pin and GND pin

19.DDR: LPDDR4 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.

Please note that do not touch the metal pins directly with your hands. 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  
25.SPI Nor Flash 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