Bringup: Power #1

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opened 2022-10-17 18:21:52 +02:00 by markus · 1 comment
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Replaced boost converter feedback resistors with 20k/7.5k due to availability constraints.

  • CPU 3.3V: Spot on
  • Boost LED power supply: 4.6V (tested up to 150 mA -> 88% eff.)
  • Charger: Seems alright, CHG_ACTIVEn seemed to not properly pull to 0, but that might be due to lack of a proper cell
  • LED string

Note: Verify configured 250 mA charge current against to be selected cell.

Replaced boost converter feedback resistors with 20k/7.5k due to availability constraints. - [x] CPU 3.3V: Spot on - [x] Boost LED power supply: 4.6V (tested up to 150 mA -> 88% eff.) - [x] Charger: Seems alright, CHG_ACTIVEn seemed to not properly pull to 0, but that might be due to lack of a proper cell - [x] LED string Note: Verify configured 250 mA charge current against to be selected cell.
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  • Changed charge rate to 200 mA for the 400 mAh LiPo battery.
  • Problem: As the CPU runs off the cell (and therefore charger) supply, it never detects that it finished charging unless the CPU is suspended. See digital bringup for more details.
* Changed charge rate to 200 mA for the 400 mAh LiPo battery. * Problem: As the CPU runs off the cell (and therefore charger) supply, it never detects that it finished charging unless the CPU is suspended. See digital bringup for more details.
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Reference: markus/leddie#1
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