[chbot] Help track down a processor - the double chox fish challenge

Mark Atherton markaren1 at xtra.co.nz
Wed Jun 23 02:10:50 BST 2021

For those with way too much spare time on their hands.

I have a CPU based Chinese product which requires some firmware updates 
(probably a complete rewrite).

Finding a pin-compatible part with a low cost tool-chain is also OK.

This is not a commercial exercise.

CPU has 20 pins, SOIC package

Pin 5 - I2C
Pin 6 - GND
Pin 7 - I2C

PIN 12 - ADC
PIN 13 - ADC

PIN 15 - 3V3

Pretty much all of the other pins are GPIO.

Almost like ATtiny87, except I2C required either side of the GND pin.

I started by using Digikey as the sifting and sorting agent, just 
wondering if their is a better way.


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