SOM Part Selection
USB-UART chip:
Goal: convert USB protocol to UART so our STM32 can read USB signals from a host computer
Current chip: CP2102N-Axx-xQFN24
4 dollars
QFN package is hard to solder
Works out of the box
Part selection requirements:
Convert some protocol (does not need to be UART) to a USB protocol so we can plug a usb cable into it
Needs to be cheap since we’re buying many of these for all SOMs ( > 5 dollars per chip)
Supports micro USB
Alternatives:
Part Number | Cost ($) | Notes |
---|---|---|
FT230XS-R | 2.26 | Provides features we need, and supports 5V PWR. A bunch of pins we probably won’t end up using |
Hitlego CP2102N board | ~2.5 |
|
FT232H | 4.09 | Comes with a lot of features like supporting SPI, I2C, JTAG Probably overkill considering we’re using this for USB debugging |
Verdict
It’s nice to have a USB chip on the SOM since we need less external boards
FT230XS-R is the winner
Power Protection:
Goal:
Part selection requirements:
Welcome to the University Wiki Service! Please use your IID (yourEID@eid.utexas.edu) when prompted for your email address during login or click here to enter your EID. If you are experiencing any issues loading content on pages, please try these steps to clear your browser cache.