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This manual provides comprehensive instructions on using the SP7350 IO Mini Control Board (MCB Board). When combined with the SP7350 Core Board, the SP7350 IO MCB Board forms a 4.1 TOPS AI platform with a wide range of I/O options for interfacing with external devices. It offers a compact and robust environment, enabling customers to develop their own AI software and applications. Please refer to the picture of the SP7350 IO MCB Board below:

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Board Dimensions: 134 mm x 101 mm

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Table of Contents

Table of Contents

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1. Description of Main Equipment or Interfaces

Refer to the photo below, which shows the SP7350 IO MCB Board with the SP7350 Core Board (covered by the black heat-sink) mounted on it:

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Item	Descriptions	Remarks
1	Ethernet RJ-45 socket	Supports 10M/100M/1000M transmission.
2	USB 3.0 Type-A socket	Supports Low/Full/High/Super speeds. Note that USB 3.0 Type-A and Type-C share with the same USB 3.0 port of SP7350, and they cannot be used simultaneously. Refer to item 11 for selection.
3	USB 3.0 Type-C socket	Supports Low/Full/High/Super speeds. Note that USB 3.0 Type-A and Type-C share with the same USB 3.0 port of SP7350, and they cannot be used simultaneously. Refer to item 11 for selection.
4	USB 2.0 Type-A socket	Supports Low/Full/High speeds.
5	HDMI output interface	Supports 1080p, 720p, 480p resolutions.
6	Jack for 12V DC power input	The DC Jack plug diameter is 5.5mm, and the adapter power supply current must be greater than 1A.
7	Reset key	Resets CM4 and Main-power domain, but does not reset RTC.
8	Wake-up key.	Functions as follows: (When powered off) Short press for 1 second: Power on (hardware action) (When powered on) Short press for 1 second: Enter deep sleep mode (software function) (During deep sleep mode) Short press for 0.3 seconds: Resume from deep sleep mode (software function). (When powered on) Long press for more than 7 seconds: Shutdown (software function). (When powered on) Long press for more than 10 seconds: Force shutdown (hardware function).
9	Jumper SIP1	It is for enabling auto power-on function: Plug in a jumper to turn on power automatically. Otherwise, required to press Wake-up key for 1 second to turn on power. Plug a jump in by default
10	Ethernet Giga PHY chip	Realtek RTL8211FD chip.
11	Jumper SIP3	For selecting USB 3.0 Type A or C socket: Plug in a jumper to select USB 3.0 Type C socket. Otherwise, USB 3.0 Type A socket is selected.
12	Jumper SIP4	Not used.
13	MIPI-RX5 interface	Raspberry Pi camera compatible, 22-pin, 0.5mm FFC connector. Refer to section 6 for pin definitions.
14	MIPI/DSI to HDMI bridge chip,	LT8912B
15	1.5F super capacitor	Provides power for the RTC (Real-Time Clock) to continue operating when no external power is supplied.
16	SP7350 boot configuration switch	Refer to section 2.3 for details.
17	M.2 E-key socket	For interfacing SDIO wireless network card. Refer to section 9 for pin definitions.
18	SP7350 Core Board with heatsink
19	Micro SD card socket
20	PCB terminal block (CN8)	Refer to section 4.1 for details.
21	PCB terminal block (CN3)
22	PCB terminal block (CN7)
23	PCB terminal block (CN6)
24	PCB terminal block (CN5)
25	PCB terminal block (CN1)
26	3-pin, 100mil Pin-header	For selecting IO voltage. Refer to section 4.2.
27	PCB terminal block (CN4)	Refer to section 4.1 for details.
28	4-pin, 100 mil Pin-header (J79)	For UART0. Pin-assignment, from top to bottom, is (+5V, GND, RXD, TXD), where RXD and TXD are 3.3V signal. Refer to section 7.
29	PCB terminal block (CN30)	For DC +12V input.
30	USB 2.0 Type C socket	For UART0. Refer to section 7.

2. Boot Devices and Configurations

The SP7350 IO Board supports booting either from on-board eMMC device or an SD card.

2.1. eMMC Boot

To boot from the on-board eMMC device, set the boot switch configuration to [1 1 1 1]. Refer to Figure 2 for visual guidance.

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The eMMC chip is located on the SP7350 Core Board, highlighted by the red rectangle in Figure 3.

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2.2. SD Card Boot

To boot from an SD card, adjust the boot switch to [1 1 0 0]. Refer to Figure 4 for the switch settings.

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Insert your SD card into the micro SD card socket, as demonstrated in Figure 5 below.

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2.3. Definitions of Boot Configuration Switch

Table 2 outlines the interpretation of boot configuration switch settings.

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In the above table, “1” signifies switch OFF, while “0” indicates switch ON.

3. In-System Program (ISP)

The SP7350 chip supports in-system programming (ISP) of the on-board eMMC device. Users can copy the ISP image file ISPBOOOT.BIN, (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to a USB flash drive or SD card and directly program it onto the eMMC device. The programming process is as follows:

3.1. ISP from an SD Card

To perform ISP from an SD card, set the boot switch to [1 1 0 0]. Refer to Figure 6 for guidance.

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Ensure that the first partition of the SD card is formatted with the FAT32 file system. Power on the system, and it will automatically program the images into the eMMC device.

3.2. ISP from a USB Flash Drive

For ISP from a USB flash drive, set the boot switch to [1 1 0 1]. Refer to Figure 8 for guidance.

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3.2.1. Using USB 3.0 Type C Socket

Copy the ISP file ISPBOOOT.BIN (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to a USB 3.0 flash drive and insert it into the USB 3.0 Type-C socket as shown in the Figure 9.

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Ensure the first partition of the USB flash drive is formatted with the FAT32 file system. Remember to plug a jumper into SIP3 to select the USB 3.0 Type-C socket. Turn on the power, and the system will automatically program the images from the ISP files into the eMMC device.

3.2.2. Using USB 3.0 Type A Socket

To use the USB 3.0 Type-A socket for ISP, insert the USB 3.0 flash drive into the USB 3.0 Type-A socket.

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Ensure to remove the jumper from SIP3 to select the USB 3.0 Type-A socket. Turn on the power, and the system will automatically program the images from the ISP files into the eMMC device.

3.2.3. Using USB 2.0 Type A Socket

To perform ISP using the USB 2.0 Type-A socket, copy the ISP file ISPBOOOT.BIN (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to a USB 2.0/3.0 flash drive. Insert the flash drive into the USB 2.0 Type-A socket.

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Turn on the power, and the system will automatically program the images from the ISP files into the eMMC device.

4. PCB Terminal Blocks

The SP7350 IO MCB Board includes 7 PCB terminal blocks, which connect to 20 GPIO pins and 2 channels of ADC input. These GPIO pins can be utilized for general-purpose input/output (GPIO) functions or configured for specific functionalities such as SPI, I2C, UART, and more. The GPIO pins can be set to either 3.3V or 5.0V input/output voltage. Figure 12 below shows the photo of the 7 PCB terminal blocks, numbered (from left to right) CN8, CN3, CN7, CN6, CN5, CN1, and CN4 on the SP7350 IO MCB Board.

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4.1. GPIO Pin-assignment and Specific Functions of Each Block

The following table details the GPIO pin assignments and specific functions for each PCB terminal block:

PCB Terminal Block	GPIO	Function 1	Function 2	Function 3
CN8	GND
	NA	SARAD3
	NA	SARADC0
CN3	GND
	GPIO84	I2C6_SLK
	GPIO85	I2C6_DATA
	GPIO71	I2C1_DATA
	GPIO70	I2C1_CLK
CN7	GND
	GPIO81	UA6_RXD	SPI1_SS	AU2_LRCK
	GPIO80	UA6_TXD	SPI1_RXD	AU2_BCK
	GPIO83	UA7_RXD	SPI5_CLK	EXT_DAC_XCK
	GPIO82	UA7_TXD	SPI5_TXD	AU2_DATA0
CN6	GND
	GPIO60	PWM2
	GPIO61	PWM3
CN5	GND
	GPIO69	I2C0_DATA	UA0_RXD
	GPIO68	I2C0_CLK	UA0_TXD
CN1	GND
	GPIO72	SPI4_RXD	SPI5_RXD	AU_BCK
	GPIO73	SPI4_SS	SPI5_SS	AU_LRCK
	GPIO74	SPI4_TXD	SPI5_TXD	ADC_DATA0
	GPIO75	SPI4_CLK	SPI5_CLK	AU_DATA0
CN4	GND
	GPIO59	UA2_CTS_B	PMW1
	GPIO58	UA2_RTS_B	PWM0	AU1_DATA0
	GPIO56	UA2_TXD	I2C2_CLK	AU1_BCK
	GPIO57	UA2_RXD	I2C2_DATA	AU1_LRCK

4.2. Configure IO Voltage

The IO voltage for the PCB terminal blocks can be configured using the following settings:

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To configure the IO voltage, adjust the voltage selection jumper accordingly.

5. USB 3.0 Type-C and Type-A Selection

The SP7350 IO MCB Board features a USB 3.0 interface that can support either a Type-C port (with Dual Role Device, DRD) or a Type-A port through a USB 3.0 switch. As shown in Figure 13, when the SEL pin is set to HIGH, the Type-A port (socket) is selected; otherwise, the Type-C port (socket) is selected.

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To select the desired USB 3.0 port, simply adjust the jumper on SIP3 accordingly. If the jumper is plugged in, the system will use the Type-C port; if the jumper is removed, the system will use the Type-A port.

6. MIPI Camera FFC Connector

The MIPI-RX5 interface of SP7350 connects to a Raspberry Pi-compatible 22-pin, 0.5mm camera FFC (Flexible Flat Cable) connector, CN22. Figure 15 shows the location of connector CN22 on the SP7350 IO MCB Board.

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For detailed pin definitions of the FFC connector CN22, refer to Figure 16.

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7. UART0 Port and UART0 over USB2.0 Type C Socket

The SP7350 IO MCB Board features a UART0 port, which can be connected to a UART terminal (such as a PC) via a 4-pin, 100-mil pitch pin-header, as illustrated in Figure 17.

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In addition to the direct pin-header connection, the SP7350 IO Board supports UART-to-USB 2.0 conversion using the CH340N bridge chip. This allows the UART0 port to be connected directly to a PC via a USB 2.0 Type-C cable.

Note: Before using the CH340N bridge chip, ensure that the appropriate driver is installed. Refer to attached Drivers for both Windows and Linux can be downloaded from the links below:

View file

name	CH341SER.7z