PAC1934 currents from the shunt values (R72 to R75, Project-Okapi #21)
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- 4/5
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- 3-5 天
- 新手友好度
- 48/100
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- 功能
- 描述清晰度
- 基本清楚
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- 活跃
- 技术栈
- arduino, cpp
- 领域
- embedded-iot
调研方向
Read Okapi.cpp around the comments at lines 182 and 237–239 to trace the PAC1934 voltage reads and current logging row. Check how the existing ADS1115 path populates IBeta and ISolar, then compare the PAC1934 setup with the shunt table and DS20005850B. Completion includes choosing snapshot or accumulated energy and verifying the stated zero-load and 1 A readings on a board.
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描述
The PAC1934 (U32) reads its four VBUS voltages today, but not its currents: Okapi.cpp says they wait on the shunt values (line 182, and the comment at lines 237–239). The values are now on the KiCad board (NorthernWidget/Project-Okapi#21, closed as the hardware half of this issue):
| Channel | Rail | Shunt | Full scale | LSB |
|---|---|---|---|---|
| 1 | V_PRIME (alkaline backup) | R73, 20 mΩ | 5 A | 76 µA |
| 2 | V_LI (the LiPo cell) | R72, 20 mΩ | ±5 A | 153 µA (bipolar) |
| 3 | V_BETA (the LiPo rail) | R75, 20 mΩ | 5 A | 76 µA |
| 4 | V_SOLAR_IN | R74, 50 mΩ | 2 A | 31 µA |
The current is VSENSE / R, with VSENSE at 100 mV full scale over 16 bits (DS20005850B). Channel 2 sits across the cell's protection FET with SENSE+ on the board side, so it reads charging as positive when set bipolar.
To do:
- Read VSENSE per channel and convert with the table above; replace the two comments.
- Decide which currents the row carries. It logs IBeta and ISolar today, from the ADS1115 path that the 2024 board does not have.
- Snapshot or accumulated energy: the chip can do either, and the choice is open (NW-Status DECISIONS, B7).
Accept on a board, from Project-Okapi/docs/v0.7-pre-build-checks.md step 5: with no load, each channel within the chip's ±0.02 mV offset (±1 mA on 20 mΩ, ±0.4 mA on 50 mΩ); with a known 1 A through a channel, 20 mV on a 20 mΩ shunt and 50 mV on the 50 mΩ one.
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