CM4 to CM3 Adapter

CM4 to CM3 Adapter-Front

CM4 to CM3 Adapter-Back

CM4 to CM3 Adapter-Installation Directions

CM4 to CM3 Adapter-Interface&Dimensions

Overview

Since the Raspberry Pi Compute Module 3 (CM3) module is in short supply, the CM4 to CM3 adapter is designed to convert CM4 module to CM3 interface.

This adapter board converts the latest Raspberry Pi Compute Module 4 (CM4) to CM3 interface, allowing CM4 to adapt to the old CM3+/CM3/CM3L series baseboard. Also Support to use CM4 with Geekworm 12mm aluminum alloy heatsink C235.

When install the CM4 module into CM4 to CM3 adapter board, please pay attention to the CM4 install directions.

Note：

1. Make sure that the CM4 module is installed on the expansion board correctly before power on.
2. Please pay attention to the CM4 install directions.
3. The Raspberry Pi Compute Module 4 or heatsink is not included in the packing list.

Features

• Raspberry Pi Compute Module 4 interface
• 1 x CM3 interface
• 1x Boot LED
• 1x Reboot Button
• Operating temperature: 0℃~80℃
• Dimensions: 67.6x46.5mm

Packing List

1x CM4 to CM3 Adapter

User Manual

Add your comment

Geekworm Wiki welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

Sort by date Sort by score

Enable comment auto-refresher

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #8

18 months ago

Score 0

Hi, i have a problem with de CM4 to CM3 adaptor . I have a CM3 evaluation board with CM3 -> HDMI works ok. CM3 evaluation board with a CM4 to CM3 adaptor and a CM4 then i have only 3 seconds HDMI signal when CM4 boot. ( Raspberry logo ) ( CM4 is running only no HDMI signal)

Same CM4 on a compute module 4 IO board HDMI ok.

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

18 months ago

Score 0

Hello，

The Raspberry PI logo shows that it can be displayed. There should be a configuration problem.

CM3 has only one video output interface, while Raspberry PI CM4 has two output interfaces. There should be a problem with the configuration of the system desktop display. Please check the configuration.

Or try reinstalling with the official system to test it out.

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #7

19 months ago

Score 0

Hi,is your adapter RoHS compliant?

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #6

24 months ago

Score 0

Hi, trying to connect the official 7-inch LCD. The LCD is set up using I2C on pin3 and pin5 on the CM3, but you have GPIO0 and GPIO1 connected to these pins. According to the CM4 datasheet, there are no GPIO0 nor GPIO1... 2 Questions: 1) Is the I2C connected? If yes, where? 2) To which pins on the CM4 are pin3 and pin5 on the SODIMM connector connected to?

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

24 months ago

Score 0

Hi，please refer the picture[Interface definition diagram];

CM4 has gpio0,gpio1;

ID_SD of CM4 corresponds to GPIO0, ID_SC is GPIO1

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #5

24 months ago

Score 0

Would this work with the CM4 Lite? (No eMMC)

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #5

24 months ago

Score 0

It does work with the CM4.

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

24 months ago

Score 0

Hi，

Please refer CM4 to CM3 Adapter#FAQQ2

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #4

28 months ago

Score 0

I am having trouble using a USB port tied to pins 165 and 167 on the CM3 connector. Does anyone know if pins 165 and 167 are directly connected to CM4 pins 103 and 105 (USB N & P)? Also, I noticed that pin 168 on the CM3 connector does not mention a USB_OTG_ID pin. Does this board not support mulitple USB ports? Thank you.

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

28 months ago

Score 0

Hello，

The USB interface is disabled to save power by default on the CM4 . To enable it you need to add dtoverlay=dwc2,dr_mode=host to the config.txt file, detail to refer to CM4 datasheet. please refer CM4 Stick

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #4

28 months ago

Score 0

Lisa, I had already added that line to the config.txt. My CM4 seemed to work fine with a CM4 I/O board USB connection, but I am not getting any USB signal from the CM4 to CM3 adapter on a CM3 board. The boot light is flashing, so it seems to be loading the image off of the SD card, but I am not getting USB signal. Is there a full pinout diagram for the CM4 to CM3 adapter that shows the CM4 connections? Thank you.

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

28 months ago

Score 0

Hi，please refer the 【Interface definition diagram】on the right

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #3

31 months ago

Score 0

dtoverlay=dwc2,dr_mode=host was necessary to make the USB bus work on the CM4 IO Board. I am having problems with the USB bus through the converter with a VBAT of 3.3V for the converter. The USB breakout is getting 5V and was working properly with a CM3+. Any ideas on troubleshooting?

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #3

31 months ago

Score 0

The CM4 was not seated all the way in the converter. We also needed to use a USB hub to reduce the strain on the 3.3 V bus on our custom board but then it seemed to work.

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #2

31 months ago

Score 0

Anonymous User #2 is GBX Technology, Giancarlo Bregante.

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

31 months ago

Score 0

Hi，

CM4 does not have gpio44 and gpio45, so only csi0 can be used.

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #2

31 months ago

Score 0

We are using both MIPI CSI Cameras (0 and 1) on the actual CM3 design so two I2C interfaces needs to be used. We found GPIO0 and GPIO (I2C0) for Camera 0 are connected from CM4 to CM3 and Camera 0 works OK. Camera 1 is NOT working, so please let me know if GPIO44 and GPIO45 (I2C) for Camera 1 are connected/mapped from CM4 to CM3. Waiting for your answer immediately.

Thanks.

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Anonymous user #1

32 months ago

Score 0

ETA1096 buzzing when installed in an Allo USBridge Signature

Permalink | Reply

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

32 months ago

Score 0

Hello，Could you please provide us with some test pictures and videos for reference? please send to support@geekworm.com ；and please tell us your order number,Thanks！

Permalink

You are ignoring the author of this comment

Show comment | Manage ignore list

Lisa

32 months ago

Score 0

This may be because the inductance of the power supply you are using produces a common frequency. We recommend that you replace a charger. We have responded to your question via email, please confirm the email.thanks

Permalink