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

[Mark Atherton]

Unsure if China or Taiwan.

Pin 5 SCL, Pin 7 SDA

No async brought out, so don't know if UART present.

ADC is quite possibly a single differential channel.

EEPROM is off-board.

No markings on CPU.

Jelly bean is 0603, with sprinkling of SOT-23 transistors.

Can't see a date-code on anything, but technology smells of maybe 8 yrs 
old; FLASH was pretty popular by then.

If it's a Chinese part, will put a small bet that it will be 8051 based 
core.

HTH

-Mark





On 23/06/2021 1:48 PM, Eliot Blennerhassett wrote:
> 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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