This manual provides comprehensive instructions 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.
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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 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 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. |
1.1. Explanation of
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Pin-Headers or
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Jumpers.
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The table below describes:
Items | Descriptions | Remarks |
1 | HDMI/MIPITX selection jumperPin-header for selecting HDMI or MIPI DSI TX | Refer to section 6 |
2 | Pin-header (2x13, 2.0mm-pitch) of LVDS output of LT8912B | Refer to Appendix II |
3 | Pin-header for selecting USB3.0 Type-C and 4-port Type-A (all 4 ports) selection jumper | Refer to section 5 |
4 | UA0/UA6/UADBG outputPin headers (3-pin, 100 mil) for UA0, UA6 and UADBG, and selecting serial port via USBUSB2.0 Type-C | Default is UA0 tol USBto USB2.0 Type-C |
5 | USB2.0 hub debug serial port | Default not connected |
6 | Selecting Pin-header for selecting GPIO output level selection (1.8V/3.3V). | Default 3.3V output |
7 | Reserved IO ports | Refer to section 4 |
8 | Plug a jumper in to turn on power automatically. Otherwise, required to press wake-up key for 1 second to turn on power. | Default short circuitPlug a jump in by default |
9 | Fan power supply, speed configured via I2C |
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10 | 12V DC power supply |
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The SP7350 IO Board supports booting either from on-board eMMC device or an SD card.
2.1. eMMC Boot
To initiate booting from on-board eMMC device, configure the boot switch as [1 1 1 1]. Please refer to Figure 3 for visual guidance.
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The eMMC chip is situated on the SP7350 Core board, indicated by the red rectangle. For precise location, consult Refer to Figure 4 below.
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2.2. SD Card Boot
For booting from an SD card, set the boot switch to [1 1 0 0]. For assistance, refer to Figure 5Refer to figure 5 below.
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Insert your SD card into the micro SD card socket, as demonstrated in Figure figure 6 below.
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2.3. Definitions of Boot Configuration Switch
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Table 3 outlines the interpretation of boot configuration switch settings.
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The SP7350 chip supports in-system programming (ISP) of the on-board eMMC device. Users can copy the compiled output file (files 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 eMMC output file files ISPBOOOT.BIN (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to the SD card and insert the SD card into the Micro SD card slot socket as shown in the figure 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 eMMC output file files ISPBOOOT.BIN (ISPBOOT1.BIN, ISPBOOT2.BIN, …) to a USB flash drive (should be formatted as FAT32) 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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After powering on, the system will automatically program the images into the eMMC device.
4. Configuring GPIO Voltage
The SP7350 IO board supports Board features 22 GPIO pins that , which can be configured for either 1.8V or 3.3V input/output voltage. These GPIO pins offer flexibility and can be utilized used individually for general-purpose input/output (GPIO) functions or . Additionally, they can be configured for specific functionalities such as SPI/, I2C/, UART, among othersand more. For detailed configurationsconfiguration options, please refer to the pinmux table. pin-mux table. Figure 12 below shows the photo of the two pin-headers, CN16 and CN17, on the SP7350 IO Board.
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The GPIO wiring diagram for CN16/CN17 is provided below:
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GPIO output voltage is configured as follows:
Jumper | GPIO Output Voltage |
 | 1.8V |
 | 3.3V |
5. USB3.0 Type-A and Type-C Selection
USB3.0 supports one Type-C port (with DRD) or four Type-A ports (through via a 4-port USB3.0 Hub).
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USB3.0 can be selected to use either 4 Type-A ports or Type-C port via a jumper.
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A pin-header is used to select either Type-C port or four Type-A ports.
Pin-header | Ports |
 | USB3.0 Type-C |
 | USB3.0 Type-A |
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The MIPI-TX can be selected to output using to either HDMI or MIPI DSI.
HDMI: A MIPI/DSI-to-HDMI bridge chip, LT8912B, is used to convert MIPI DSI signal to HDMI interface.
MIPI DSI: The MIPI-TX of SP7350 is routed to an FFC connector connectors directly for external connections directlyLCD 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 SP7350.
A jumper pin-header is used to select to output to HDMI or MIPI DSI, as outlined below:
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Pin-header | Output |
 | HDMI |
 | MIPI DSI (30-pin or 15-pin FFC) |
7. MIPI
7.1. MIPI-RX2
Note that version A of SP7350 does not support this channel.
MIPI-RX2 is connected to a Raspberry Pi camera compatible, 22-pin, 0.5mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 16.
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Jumpers are required across GPIO74, GPIO75, GPIO77, and GPIO76 on CN17, as depicted in Figure 17:
Figure 17 MIPI-RX2 Jumpers
7.2. MIPI-RX3
MIPI-RX3 is connected to a Raspberry Pi camera compatible, 15-pin, 1.0mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 18.
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MIPI-RX3 is connected to a Raspberry Pi camera compatible, 15-pin, 1.0mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 20.
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MIPI-RX5 is connected to a Raspberry Pi camera compatible, 22-pin, 0.5mm, camera FFC connector. For pin definitions of the FFC connector, please refer to Figure 22.
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MIPI-TX (4d1c)5 is connected to a Forlinx Embedded LT8912B “LT8912B MIPI-to-HDMI Bridge Board CompatibleBoard” compatible, 30-pin, 0.5mm FFC connector. For pin definitions of the FFC connector, please refer to Figure 24.
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Jumpers are required across GPIO78, GPIO79, GPIO88, GPIO89, GPIO91, and GPIO90 on CN16, as depicted in Figure 25:
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Note that the MIPI-TX (4d1c), MIPI-TX (2d1c), and HDMI outputs all share the same input source. Therefore, these three interfaces cannot be used simultaneously.
7.6. MIPI-TX (2d1c)
MIPI-TX (2d2c) is connected to a Raspberry Pi display compatible, 15-pin, 1.0mm, display FFC connector. For pin definitions of the FFC connector, please refer to Figure 26.
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Jumpers are required across GPIO91, and GPIO90 on CN16, as depicted in Figure 27:
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Note that the 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.
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 uses one ADC channel to detect the three key buttons. When a key is pressed, the corresponding ADC input (ADKEY) voltage changes. The schematic is shown below:
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ADC Sample Value | Key Pressed |
0V | KEY1 |
0.9V | KEY2 |
1.2V | KEY3 |
1.8V | No Key Pressed |
KEY3 | |
1.8V | No Key Pressed |
Code of key-event can be set in device-tree source.
9. Serial Ports
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, 100100mil-mil pitch pin-header, as illustrated in Figure 30. 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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The SP7350 IO Board also supports UART to USB2.0 conversion using the CH340N bridge chip. This enables one serial port to connect directly to a PC via a USB2.0 Type-C cable. Refer to the table below for connecting a UART port to the UART-to-USB bridge (CH340N). Connecting one UART port requires plugging in two jumpers.
Channel |
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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.
Appendix I Pin Definitions of Wireless Network Card
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Appendix II Pin Definitions of LVDS Output of LT8912B
The pin definitions of the pin-header of the LVDS output of LT8912B are as follows:
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