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SuperThunder/keweisi-mx18-pin-reverse.md

Last active August 28, 2020 21:47
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Keweisi MX18 USB Tester / Meter Teardown and Pin Reverse Engineering
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keweisi-mx18-pin-reverse.md

A while ago I got a nice USB current/voltage meter as described here

Curious to see how it worked, I opened it up - and then it never worked again. The OLED screen turns on but nothing is displayed. Looking at the TSSOP20 chip, I thought it might be an STM8 or STM32F0 which I could debug or reprogram. It turned out not to be, although the pinout is extremely close.

board_pins

pinout_vs_stm8

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