This manual provides comprehensive instructions on how to use the SP7350 IO Board. The SP7350 IO Board, when combined with the SP7350 Core Board, serves as a demonstration platform for showcasing the hardware and software capabilities of the SP7350. Additionally, it offers customers a robust environment to develop their own software and applications.
For Chinese language users, a corresponding version of this documentation is available in the PDF file named "SP7350_IO_Board使用手册v1.1".
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Please refer to the picture of the SP7350 IO Board below:
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Table of Contents
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Item | Descriptions |
1 | 12V DC power input. The DC Jack plug diameter is 5.5mm, and the adapter power supply current must be greater than 1A. |
2 | Ethernet RJ-45 socket, supports 10M/100M/1000M transmission. |
3 | Ethernet Giga PHY, Realtek RTL8211FD chip. |
4 | HDMI output interface, supports 1080p, 720p, 480p. |
5 | MIPI/DSI to HDMI bridge chip, LT8912B |
6 | 4-pole, 3.5mm, TRRS headset jack, Apple type (L, R, G, M). |
7 | Analog microphone input. |
8 | Speaker output, can only output either to headset or speakers. |
9 | Audio codec chip, ES8316 |
10 | Wake-up button. Functions as follows:
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11 | Reset button, resets CM4 and Main-power domain, but does not reset RTC. |
12 | USB3.0 Type-C socket, supports Low/Full/High/Super speeds. Please note, 4-port USB3.0 Type-A and Type-C are multiplexed, and they cannot be used simultaneously. |
13 | Serial port Type-C socket, supports UA0, UA6 or UADBG ports through jumpers. Refer to section 9. |
14 | USB to serial bridge chip, CH340N. |
15 | Dual USB3.0 Type-A socket, supports Low/Full/High/Super speeds. |
16 | Dual USB3.0 Type-A socket, supports Low/Full/High/Super speeds. |
17 | 4-port USB3.0 Hub chip, VL817-Q7S |
18 | SPI-NOR flash chip, MX25L512, used with USB3 hub chip. |
19 | Dual USB2.0 Type-A socket, supports Low/Full/High speeds. |
20 | Dual USB2.0 Type-A socket, supports Low/Full/High speeds. |
21 | 4-port USB2.0 Hub chip, SPD104 |
22 | EEPROM chip, used with USB2 Hub chip. |
23 | M.2 E-key socket for interfacing SDIO wireless network card. Refer to Appendix I for pin definitions. |
24 | MIPI-RX2 interface, Raspberri Raspberry Pi camera compatible, 22-pin, 0.5mm , top-contact FFC connector. Note that version A chip of SP7350 does not support this channel. |
25 | MIPI-RX3 interface, Raspberry Pi camera compatible, 15-pin, 1.0mm, FFC connector compatible. Refer to section 7.2 for pin definitions. |
26 | MIPI-RX5 interface, Raspberri Raspberry Pi camera compatible, 22-pin, 0.5mm , top-contact FFC connector. Refer to section 7.4 for pin definitions. |
27 | MIPI-RX4 interface, Raspberry Pi camera compatible, 15-pin, 1.0mm, FFC connector compatible. Refer to section 7.3 for pin definitions. |
28 | MIPI-TX (1c2d) interface, Raspberry Pi display compatible, 15-pin, 1.0mm, FFC connector compatible. Refer to section 7.6 for pin definitions. |
29 | MIPI-TX (1c4d) interface, Forlinx Embedded compatible, 30-pin, 0.5mm, top-contact, FFC connector. Refer to section 7.5 for pin definitions. Note: Both MIPI-TX connectors share signals with the HDMI interface. All 3 interfaces cannot be used simultaneously. |
30 | Three key buttons. Refer to section 8 for details. |
31 | SP7350 boot configuration switch. Refer to section 2 for details. |
32 | Micro SD card socket. |
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The SP7350 chip supports in-system programming (ISP) of the on-board eMMC device. Users can copy the compiled output files 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:
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For ISP from an SD card, set the boot switch to [1 1 0 0]. Refer to Figure 7 below.
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Copy the compiled output files ISP image file ISPBOOOT.BIN (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to the SD card and insert the SD card into the Micro SD card socket as shown in the Figure 8 below:
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Note that the first partition of the SD card should be formatted with FAT32 file-system.
Power on the system, and the system will automatically program the images into the eMMC device.
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For ISP from a USB flash drive, set the boot switch to [1 1 0 1]. Refer to Figure 9 below.
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Copy the compiled output files ISP image file ISPBOOOT.BIN (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to a USB flash drive and insert the USB flash drive into the USB3.0 Type-C socket. Note that the first partition of the USB flash drive should be formatted with FAT32 file-system.
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Remember to plug in the USB3.0 Type-A or Type-C selection jumper.
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Jumper | GPIO Output Voltage |
 | 1.8V |
 | 3.3V |
5. USB3.0 Type-
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C and 4-Port Hub (Type-
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A) Selection
USB3The USB 3.0 supports interface can support either one Type-C port (with DRD) or four Type-A ports (via a 4-port USB3USB 3.0 Hub) through a USB 3.0 switch.
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A pin-header is used to select either Type-C port or four Type-A portsAs shown in Figure 14, when the SEL pin is set to HIGH, the USB 3.0 Hub is selected, enabling the four Type-A ports. Otherwise, the Type-C socket is selected.
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Figure 15 shows the USB 3.0 Type-C socket, the four Type-A sockets, and the pin-header (jumper) used to control the USB 3.0 switch.
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The following table illustrates how to select Type-C or 4-port hub (Type-A).
Pin-header | Ports |
 | USB3.0 Type-C |
 | USB3.0 Type-A |
6. HDMI and MIPI
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DSI Selection
The MIPI-TX interface can be selected configured to output to either HDMI or native MIPI DSI. Refer to Figure 16 for the hardware connections of the MIPI-TX interface.
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When the SEL pin is set to HIGH, HDMI is selected. Otherwise, the native MIPI DSI signal is routed to the FFC connectors.
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A MIPI/DSI-to-HDMI bridge chip
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(LT8912B
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) is used to convert the native MIPI DSI signal to an HDMI interface.
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The
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FFC connectors
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(native MIPI DSI) are for connecting to external LCD panels or devices.
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Note that HDMI and MIPI DSI cannot be used simultaneously because they share the same MIPI DSI source from the SP7350.
Figure 17 shows the HDMI connector, the pin-header (jumper), and the two MIPI DSI FFC connectors.
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A pin-header is used to select to the output to either HDMI or MIPI DSI, as outlined outlined in table below:
Pin-header | Output |
  | HDMI |
  | MIPI DSI (30-pin or 15-pin FFC) |
7. MIPI
7.1. MIPI-RX2
Note that version A chips of SP7350 does not support this channel.
MIPI-RX2 is connected to a Raspberry Pi compatible, 22-pin, 0.5mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 1618.
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Jumpers are required across GPIO74, GPIO75, GPIO77, and GPIO76 on CN17, as depicted in Figure 1719:
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Since Raspberry Pi uses 3.3V for I2C and IO, please select GPIO voltage to 3.3V. Refer to figure 18 20 below:
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7.2. MIPI-RX3
MIPI-RX3 is connected to a Raspberry Pi compatible, 15-pin, 1.0mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 1921.
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Jumpers need to be placed across GPIO70, GPIO71, GPIO72, and GPIO73 on CN17, as illustrated in Figure 2022:
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Since Raspberry Pi uses 3.3V for I2C and IO, please select GPIO voltage to 3.3V.
7.3. MIPI-RX4
MIPI-RX3 is connected to a Raspberry Pi compatible, 15-pin, 1.0mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 2123.
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Jumpers are required across GPIO63, GPIO19, GPIO68, and GPIO69 on CN16, as depicted in Figure 2224:
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Since Raspberry Pi uses 3.3V for I2C and IO, please select GPIO voltage to 3.3V.
7.4. MIPI-RX5
MIPI-RX5 is connected to a Raspberry Pi compatible, 22-pin, 0.5mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 2325.
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Jumpers are required across GPIO61, GPIO60, GPIO85, and GPIO84 on CN16, as depicted in Figure 2426:
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Since Raspberry Pi uses 3.3V for I2C and IO, please select GPIO voltage to 3.3V.
7.5. MIPI-TX (4d1c)
MIPI-TX (4d1c)5 is connected to a Forlinx Embedded “LT8912B MIPI-to-HDMI Bridge Board” compatible, 30-pin, 0.5mm FFC connector. For pin definitions of the FFC connector, please refer to Figure 2527.
Jumpers are required across GPIO78, GPIO79, GPIO88, GPIO89, GPIO91, and GPIO90 on CN16, as depicted in Figure 2628:
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Note:
MIPI-TX (4d1c), MIPI-TX (2d1c), and HDMI outputs all share the same input source. Therefore, these three interfaces cannot be used simultaneously.
If connecting to a Forlinx Embedded “LT8912B MIPI-to-HDMI Bridge” board, please select GPIO voltage to 3.3V.
7.6. MIPI-TX (2d1c)
MIPI-TX (2d2c) is connected to a Raspberry Pi compatible, 15-pin, 1.0mm, display FFC connector. For pin definitions of the FFC connector, please refer to Figure 2729.
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Jumpers are required across GPIO91, and GPIO90 on CN16, as depicted in Figure 2830:
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Note:
MIPI-TX (4d1c), MIPI-TX (2d1c), and HDMI outputs all share the same input source and I2C channel. Therefore, these three interfaces cannot be used simultaneously.
Since Raspberry Pi uses 3.3V for I2C and IO, please select GPIO voltage to 3.3V.
8. Keys
The SP7350 IO Board has 3 key buttons that can trigger different software functions when pressed.
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The SP7350 IO Board includes three UART ports: UART6, UART0, and UADBG. Each UART port can connect to a UART terminal (a PC) via a 3-pin, 100mil-pitch pin-header, as illustrated in Figure 3133. The pin-out for each pin-header, from left to right, is GND, RX, and TX. All signals are in 3.3V level.
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Channel | Jumpers |
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Connect UA6 to Type-C socket |  |
Connect UA0 to Type-C socket |  |
Connect UADBG to Type-C socket |  |
Note:
Only one UART can be connected to the UART-to-USB bridge at a time.
Before using the CH340N, you need to download and install its driver. Refer to attached Windows and Linux drivers.
View file name CH341SER.7z View file name CH341SER_LINUX.ZIP Before using UADBG, please mount position R412 and R413 with 0Ω resistor.
Appendix I Pin Definitions of Wireless Network Card
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