Can anyone identify the microcontroller on a W1209 thermostat?

Thread Starter

amms129

Joined Jan 18, 2022
2
Can anyone identify the micro-controller on a W1209 thermostat board?
The W1209 is a simple very cheap relay thermostat that used to come with TM8S003F3P6 or another unmarked micro-controller in TSSOP20 casing. On this board I recently purchased from Aliexpress the micro-controller is in QFN24 casing and the LDO on the board is now changed to AMS1117-3.3 (instead of the HT7150 on my previous boards) which means it works on 3.3V.
The marking on the board is 808D G00FZ 1617+.
enter image description here

enter image description here
 

DickCappels

Joined Aug 21, 2008
8,674
It might be a custom Application Specific Integrated Circuit and whether a Microncontroller or ASIC it may be proprietary or a proprietary/customised version.
 

Thread Starter

amms129

Joined Jan 18, 2022
2
It might be a custom Application Specific Integrated Circuit and whether a Microncontroller or ASIC it may be proprietary or a proprietary/customised version.
Thanks , but i don't think this chip is an ASIC , because there are 4 pins next to this chip for programming and all ASIC chips are unprogrammable .

Photo Nov 15, 16 44.jpg
 

absf

Joined Dec 29, 2010
1,968
Agreed. I've checked a few mcu in pic16 and stc family with qfn24 footprints but none so far matches the wiring of your chip. Didn't try the avr and stm yet.
 
Top