Raspberry Pi CM4-to-CM3-Board User Guide

Overview

Raspberry Pi Compute Module 4 CM4 to CM3 Adapter CM3+ Adapter board converted from cm4

Resource comparison

The adapter board calls CM4 resources

CM4-to-CM3-Board	CM4
HDMI	HDMI0
GPIO0~27	GPIO0~27
GPIO28、GPIO29	GPIO44（SDA0）、GPIO45（SCL0）
GPIO31、GPIO33	CAM_GPIO
GPIO30、GPIO32、GPIO33~45	NC
CSI0	CSI1
CSI1	CSI0
DSI0	DSI1
DSI1	DSI0
USB2.0	USB2.0
SDIO	SDIO

Onboard resources

CM4 connector: connect CM4
CM4 working status light: used to judge whether CM4 is working
MP28164: DC buck-boost chip
Power supply selection: the resistor on the left - direct power supply; the resistor on the right - power supply after passing through the DC buck-boost chip (default)
IO level selection: select the IO level of CM4 (3.3V is selected by default)
CM3 interface: used to connect to the CM3 backplane

Manual

Official Manual

Software

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com

TAG： RP2350B-MINI-A picotool Tutorial Raspberry Pi DTM3202 14 inch Dual LCD Computer PC Monitor Display Double Secondary Screen Type C Mini HDMI 1080P For Windows/MacOS Raspberry Pi 5 Power ESP32-C6 WiFi 6 Development Board ESP32-C6-MINI-1Support WiFi6 Bluetooth5 Zigbee Thread SpotPear Milk-V Duo Camera Install Espressif IDF Plugin Tutorial User Guide Raspberry-Pi-A7670E-GSM-GPRS-GNSS-LTE-Cat-1-2G-A-User-Guide X1007 Raspberry Pi 5 PCIe to Dual 2.5" SATA HDD/SSD Double-SATA (NOT BOOT From SATA/SSD Raspberry Pi 5 Audio hat Ranging Sensor ESP32-S3 Round LCD Pi5 ESP32-P4 DEV-KIT C6 WiFi6 MIPI DSI 7/10.1 inch Display/CSI Camera/Audio Speaker For AI Deepseek Raspberry Pi PICO Raspberry Pi Pico 2 RP2350B 3.49-inch capacitive TouchCcree 3.49inch LCD display development board 172×640 Raspberry Pi Pico 2 RP2350 4inch LCD CAN RS485 QMI8658 Development Board 480x480 TouchScreen Display LVGL HMI I2C Sensor Raspberry Pi CM5 4G/5G Dual Ethernet Port ETH Gigabit/2.5G Expansion Board with RJ45 IO Base and GPIO

Raspberry Pi Compute Module 4 CM4 to CM3 Adapter CM3+ Adapter board converted from cm4

TAG： Raspberry Pi 5 LuckFox USB to CAN Raspberry Pi RTC WatchDog HAT (B) Argon Neo 5 Pi 5 PCIe to M.2 Industrial Modbus POE ETH Relay 30CH RTU Modbus TCP-Ethernet Digital Input PoE Power IOT DeepSeek ESP32-S3 Voice Chat Robot 3.13 inch LCD ESP32 S3 AI Voice Chat Robot 1.54inch Development Board with 1.54 inch LCD Display Screen Deepseek Raspberry Pi 5 MiniPCIe Interface 2 CH CAN Card Multiple Protection Circuits Raspberry Pi OS Jetson Nano Windows Raspberry Pi 11.9 inch DSI LCD Display MIPI 320×1480 Capacitive TouchScreen Milk-V Duo RJ45 CVITEK CV1800B SG2000 SG2002 64MB 256MB 512MB RISC-V DRAM-64M Chip Raspberry Pi 5 PCIe M.2 NVMe SSD Pi5 2280-2242-2230-Board-D Sensor Development Board Grove Sensor Kit SeeedStudio-XIAO series Development boards Aluminum Heatsink Jetson Orin Nano/NX Super Developer IO Base Development Board HDMI Version For Jetson Orin Nano/NX Module Raspberry Pi 5 Red-White Case