UIUCBreakout
The sensor and memory half of the UIUC tag. Thirteen footprints, three of them the parts being prototyped.
Block diagram
flowchart TB
subgraph PROTO["UIUCBreakout"]
direction LR
subgraph SENSE["Sensors"]
direction TB
ACC["ADXL367<br/>accelerometer"]
PRS["BMP585<br/>pressure"]
end
MEM["AT25FF321A<br/>4 MB serial flash"]
CONN["J3 + J4<br/>2 × 1×17 header"]
end
SENSE --- CONN
MEM --- CONN
CONN === BASE["tag-breakout-l432v2<br/>processor, RTC"]Major components
| Role | Part | Notes |
|---|---|---|
| Accelerometer | ADXL367BCCZ-RL7 | Hardware activity/inactivity state machine |
| Pressure | BMP585 | Barometric pressure and temperature |
| Memory | AT25FF321A-SHN-B | 4 MB serial flash, low quiescent current |
| Base interface | J3, J4 — PinHeader_1x17 |
What is distinctive
The sensor set is the production tag's, bar the accelerometer. BMP585 and
AT25FF321A are what UIUCTag carries. The ADXL367 here is what
BitPresTagBMP585 carried; UIUCTag replaced it with an ADXL362 because of
problems with the ADXL367's inactivity detector, so accelerometer measurements
made on this board do not carry over to the tag.
The flash is in a different package. This board uses the -SHN-B variant of
the AT25FF321A where the tag uses -UUN-T — a prototype can afford a part that
is easier to hand-solder.
There is a second analysis document in this directory
Alongside UIUCBreakout-design-review.md sits
TorporTagBreakout-analysis.md, named for a different board. The project has
a history of copying a board directory as the starting point for the next
one, and the stray file is a leftover of that rather than a document about
this board.