What microcontroller is this? [image]

[Tim (Guest)]

Hi I took a activity tracker apart with the goal of writing my own 
firmware for it. I stumbled accross the component in the picture. But 
don't know at all what  it could be. It is directly wired to an 
accelerometer and a 256Kbit EEPROM.
Do you recognize the Logo?

Background information:
The activity tracker is based on the nRF51822
Link to the complete circuit board with background information: 
https://github.com/54696d21/reverse_engineering_nrf5x-wearables/blob/master/I5Plus-nrf51822-activity-tracker/Documentation/components.md

[hinz (Guest)]

Tim wrote:
> Hi I took a activity tracker apart with the goal of writing my own
> firmware for it. I stumbled accross the component in the picture. But
> don't know at all what  it could be. It is directly wired to an
> accelerometer and a 256Kbit EEPROM.
> Do you recognize the Logo?
>
> Background information:
> The activity tracker is based on the nRF51822
> Link to the complete circuit board with background information:
> https://github.com/54696d21/reverse_engineering_nr...

GT22L16V2Y

[Jim M. (turboj)]

My guess would by a gyroscope chip, but I was unable to find a match. 
Look at a distributors website for possible machtes on the package, and 
then look at the pinouts in the datasheet.

[Petor (Guest)]

>GT22L16V2Y

http://www.genitop.com/

So this is a display controller from Genitop? Rather unusual to have 
this as a separate part. Usually you see everything being controlled 
directly from the main MCU is low cost fitness trackers.

[Tim (Guest)]

hinz wrote:
> Tim wrote:
>> Hi I took a activity tracker apart with the goal of writing my own
>> firmware for it. I stumbled accross the component in the picture. But
>> don't know at all what  it could be. It is directly wired to an
>> accelerometer and a 256Kbit EEPROM.
>> Do you recognize the Logo?
>>
>> Background information:
>> The activity tracker is based on the nRF51822
>> Link to the complete circuit board with background information:
>> https://github.com/54696d21/reverse_engineering_nr...
>
> GT22L16V2Y

Thank you very much, that looks very promising. How did you find that 
out?

[hinz (Guest)]

Tim wrote:
> How did you find that
> out?

https://en.wikipedia.org/wiki/Crystal_ball#/media/File:Quartz_crystal.jpg

[Rudolph (Guest)]

Petor wrote:
> So this is a display controller from Genitop?

No, it is just some SPI memory containing fonts.

[Tim (Guest)]

hinz wrote:
> Tim wrote:
>> How did you find that
>> out?
>
> https://en.wikipedia.org/wiki/Crystal_ball#/media/...

I'll take one please :)
I'm also looking for a datasheet to the component in this image

[Tim (Guest)]

Rudolph wrote:
> Petor wrote:
>> So this is a display controller from Genitop?
>
> No, it is just some SPI memory containing fonts.

Do have any source for that? My impression of the chinese datasheet in 
Google translate isn't the same...

Thanks to you all :)