M.2 A-E Key Simple Carrier Board

A carrier to connect a M.2 Board to USB breaking out all other signals to TH testpoints

MagicWolfi

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Description

A carrier to connect a M.2 Board to USB breaking out all other signals to TH testpoints.
The design came to life initially to test my M.2 RP2040 board (https://hackaday.io/project/199091-rp2040-m2-pico).
First version of the board build with the beautiful after-dark process of OSH Park.

Details

List of features:

- M.2 slot with all pads on the board to accept any key slot M.2 module, if the correct connector is mounted

- Specifically made for A key and E key, works with a subset of signals for B key and M key.

- USB-C set up for 5V 3A max power draw.

- Switching regulator to generate 3.3V 1.5A to power the M.2 module.

- 1.8V LDO regulator to be able to work with the 1.8V UART and I2C signals

- Power switch for the 3.3V to the M.2 module with an enable jumper

- LEDs for 1.8V, 3.3V and switched 3.3V

- No mounting holes :( , will be added to rev 2.

- Design in KiCAD 8.

- Hand soldered.

Project Logs

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Testing the first board
MagicWolfi • 17 hours ago • 0 comments

Testing the board went well so far.

- 3.3V switcher is working and stable at 3.259 V.

- Power switch is working. 0V went the jumper is open.

- Got USB connection on the 2nd try. Issue was the standard USB-C issue: I did not notice that I used a power only cable because of no markings on the cable. With a good USB-C data cable I got immideate connection to my M.2 RP2040 board. It showed up as the regular RP2 device and I could program my test FW without issues.

- LEDs are working.

- 1.8 V regulator is not populated yet.
- And we can play the usual game of rev1 to find the uups in the silkscreen. This time it is 2 of them.