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

[Eliot Blennerhassett]

On 23/06/21 1:10 pm, Mark Atherton wrote:
> 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.

Some clarifying questions...

? China or Taiwan ?

? I guess there are no markings at all on the chip?

? Which pin is SDA and which SCL ?

? You're assuming it is reprogrammable (i.e. flash based) ?

? Likely to have EEPROM ?

? Has UART ?


> 
> 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.

Ask on electronics.stackexchange.com ?

> 
> -mark
> 
> 
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