wanming2008 / airtag-re

Airtag RE (**NO FIRMWARE** IN REPO)

NOTE 1: please fork this repo if using for your own use. I don't intend for this to be a central resource for airtag RE, more just some useful references for you to build on.

NOTE 2: This repo will not have any firmware or similar. Issues are disabled because the repo does not have any issues, it's perfect.

Test Points

Name	Description
VCC1	+3.0V input (1 of 2 - both needed)*
VCC2	+3.0V input (2 of 2 - both needed)*
GND	Ground
22	1.8V SPI Flash - SCLK / nRF ball G3 (P0.17)
19	1.8V SPI Flash - Data In (COPI) / nRF ball H3 (P0.16)
20	1.8V SPI Flash - Data Out (CIPO) /nRF ball H4 (P0.15)
24	1.8V SPI Flash - Chip Select (CS)/ nRF ball F4 (P0.11)
21	1.8V SPI Flash VCC
34	1.8V from nRF
31	nRF ball H2 (P0.18)
30	nRF ball H1 (P0.21/nRST)
29	Apple Logo :) GND
36	nRF ball G1 (SWDIO)
35	nRF ball F1 (SWCLK)

*NOTE: The big pads under the VCC1/VCC2 battery terminals are NOT connected. So if you remove the battery terminals you need to solder to the smaller pads where the terminals connected!

SPI Connections

The SPI connections (SCK/DI/DO/CS) are as above. If talking to the SPI flash chip note the following:

• The nRF should be held in reset (maybe via SWD? Need to test, not clear reset pin is configured as reset and not GPIO.)
• You need to apply 1.8V on test point 21.

Currently this was confirmed w/ erasing the nrf device. The nrf controls power to the SPI flash, so you need to override it by supplying 1.8V on test point 21.

Images

See repo for higher resolution.

License

This repo is licensed CC-BY-4.0.