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prototype tests and findings #2

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13 tasks done
Tobi3566 opened this issue May 1, 2021 · 0 comments
Open
13 tasks done

prototype tests and findings #2

Tobi3566 opened this issue May 1, 2021 · 0 comments

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@Tobi3566
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Tobi3566 commented May 1, 2021 •
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General tests

  • talk with fuel gauge
  • talk with RTC
  • talk with IO expander
  • AUX 3v3 enable & disable via EXP
  • AUX 5V enable & disable via EXP
  • test charging IC
  • RTC bypass test
  • temperature reading
  • 3v3 RTC regulator
  • power on Interrupt

Advanced regulator tests

  • 3.3V regulator datasheet dropout voltages and current confirmed
  • 5V boost converter tested up to 1A at 4.1V VBat and 750mA at 3.5V (well within spec)
  • sleep current measured at 5.8µA

other Findings

  • !! R15 too small -->5.5V output which is too high (swap with 24k for 5.1V)
  • AP9101C does not support auto wake up when battery is first plugged in. (could use AP9101C A part instead)
  • io expander pulls down charge disable therefore not making it impossible to start the board with a low battery. (can be fixed by adding a npn inbetween)
  • caps on 3v3 rails not big enough, sometimes esp crashes during bootup (added 22µF on esp shield) and for V1.00 cap in parallel to mcu rail reccomended.
@Tobi3566 Tobi3566 changed the title prototype findings prototype tests and findings May 2, 2021
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