Waveshare: Compute Module IO Board Plus for CM3 CM3-Lite CM3+ CM3+Lite

Compute Module IO Board Plus Features

• Compatible with the Compute Module IO Board V3 from the Raspberry Pi Foundation
• Raspberry Pi GPIO header, for connecting sorts of Raspberry Pi HATs
• Arduino connectivity, also supports Arduino shields
• 1-WIRE interface, for connecting single-bus devices like DS18B20
• 4x keys, 4x LEDs, 1x Buzzer, for I/O testing
• Onboard USB HUB, allows connecting more USB devices
• IR receiver, IR remote control is available
• Onboard USB TO UART, for serial debugging
• Sensor interface
• 10-bit ADC, 38KSPS, 11-ch (6-ch for Arduino interface, 5-ch for sensors)
• 16-bit DAC, 2-ch
• Onboard RTC, one of the most common and useful functions

What's on the Compute Module IO Board Plus

1. Compute Module interface: for connecting Compute Module (CM3 / CM3L / CM3+ / CM3+L)
2. Compute Module GPIO header: breakout all the Compute Module pins
3. Raspberry Pi GPIO header: for connecting Raspberry Pi HATs
4. CSI interface: camera ports, for connecting Raspberry Pi Camera
5. DSI interface: display ports, for connecting Raspberry Pi LCD
6. HDMI port
7. USB ports: for connecting USB devices
8. USB SLAVE interface: allows you to burn system image in to Compute Module 3/3+
9. USB TO UART interface: for serial debugging
10. Arduino header: for connecting Arduino shields
11. AD/DA input/output screw terminals
12. 1-WIRE interface: for connecting single-bus devices like DS18B20
13. Sensor interface
14. Power port: 5V 2.5A
15. FE1.1S: USB HUB chip
16. 12MHz crystal
17. CP2102: USB TO UART converter
18. Micro SD card slot: insert a Micro SD card with pre-burnt system, to start up Compute Module 3/3+ Lite variant
19. TLC1543: AD converter
20. DAC8552: 16-bit DAC, 2-ch
21. DS3231: high-precision RTC chip, I2C interface
22. RTC battery holder: supports CR1220 batteries
23. Voltage regulator: 3.3V / 2.5V / 1.8V 
24. LFN0038K: IR receiver
25. Buzzer
26. Power indicator
27. ACT indicator: indicating the Micro SD card status
28. User LEDs
29. User Keys
30. BOOT selection
    • EN: enable the PC to access SD card/eMMC through USB SLAVE
    • DIS: the Compute Module will boot from SD card/eMMC
31. VGx power selection: config the I/O level
32. USB HUB enable jumper: HUB enable and USB SLAVE power selection
33. ADC/DAC configuration: config the power supply and reference voltage of ADC/DAC
34. Peripheral configuration: config the control pins of UART, user keys, user LEDs, 1-WIRE interface, IR receiver, and buzzer
35. Arduino AD selection
    • connect 1 and 2: Arduino A0-A5 as digital control pin
    • connect 2 and 3: Arduino A0-A5 as AD input