[chbot] Chocolate fish challenge: identify the chip

Mark Atherton markaren1 at xtra.co.nz
Wed Oct 24 01:20:26 BST 2012

Unit also may have on-board LCD driver hw - that may narrow things down

Presumably an async channel to the radio, so UART, or USART

Square TQFP, rather than rectangular

868MHz RF indicates a non-US ISM band, but if it could be fitted with 
a 915MHz radio for sale in the US, it might have an FCC number and 
the FCC report may be public.

What device is U2 ?


At 11:57 a.m. 24/10/2012, you wrote:
>I'm trying to identify the MCU used in a product where the chip's 
>markings have been helpfully ground off.
>I have this device in my possession and am able to perform 
>non-destructive tests. See photo :
>Some clues:
>    * TQFP package with 100 pins
>    * 3.3 V power rail
>    * VCC on pins 96,60,14,97
>    * GND on pins 62, 12
>    * Decoupling caps between 60/62 and 14/12 - I'm thinking they 
> are the power pins.
>    * No external crystal used in the design.
>    * Red dot indicates pin one, though may not have been painted by 
> manufacturer.
>I offer a chocolate fish for any confirmed progress towards identification.
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