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： Spotpear Raspberry Pi 8 inch DSI MIPI LCD TouchScreen Display 8inch 800x1280 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576 Raspberry Pi 5 Development Board Industrial USB TO 8CH TTL Converter USB to UART Multi Protection Circuits Multi Systems Raspberry Pi 5 ESP32 S3 Development Board 1.75 inch AMOLED Display TouchScreen SD slot 6-axis sensor Xiaozhi AI Deepseek Bevelopment Board RS485 to CAN Jetson Raspberry Pi MLX90640 ESP32-C3FN4 UNO Minima RA4M1 ZERO Tiny SuperMini R7FA4M1 Board Compatible With R4 For Arduino Raspberry Pi 5 Raspberry Pi 5 PCIe USB HUB 3.2 Gen1 HAT+ High Speed Pi5 WIFI Configuration Serial UART Bus Servo ST3025 TTL 40KG.CM Magnetic Encoder 360° High Precision And Large Torque Raspberry Pi 5 PCM5122 I2S Audio Card DAC Also For PI4 /PI3 /Zero Series 7.5 inch Passive NFC e-Paper V2 BW Display 7.5inch E-ink Screen No Need Battery Wireless Powered Data Transfer For Mobile APP ESP32 S3 LCD Development Board 1.3 inch Display 1.3inch Screen ST7789 240x240 Mini TV SD-Port QST QMI8658 Gyro Sensor LVGL For Arduino

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

TAG： ESP32 MLX90640 Raspberry Pi 4B ABS black shell Case For Official Original 7 inch 800x480 display Touch Screen voice module Jetson Nano 5G module White Raspberry Pi 4B Raspberry Pi 5 PCIe to M.2 Pi5 Fan Raspberry Pi 5 Audio Jack ESP32 IR Thermal Imaging Camera ESP32-S3 TFT ESP32 P4 Development Board 7-inch LCD Display 1024×600 7inch Touchscreen ESP32-C6 WiFi6 AI Deepseek USB Camera 2MP GC2093 ‌WDR Backlight Compensation‌ Onboard microphone AI Board USB to CAN SpotPear ESP32-H2-MINI-1-N4 Raspberry Pi 5 PCIe M.2 NVMe SSD Pi5 2230-Board mini Arducam SpotPear