I'm building a solar project to monitor charge current and discharge current as well as lipo 'State Of Charge'.
The configuration is a 5V solar panel feeding a TP4056 which B+/- connect to a MAX471 bidirectional current monitor which connects to a LiPo in parallel with a MAX17043G lipo fuel gauge.
Unfortunately in this configuration with sensors on the B+/- outputs I cannot associate my TP OUT ground pin to those sensors without creating a ground loop that would prevent TP protection from working properly. I understand this is a non-typical configuration but this is the only way I could monitor charge & discharge current with one sensor and one analog pin.
Any input would be greatly appreciated.
Datasheets:
- CHRG – https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/TP4056.pdf
- Current Sense – https://pdfserv.maximintegrated.com/en/ds/MAX471-MAX472.pdf
- Fuel Gauge – https://datasheets.maximintegrated.com/en/ds/MAX17043-MAX17044.pdf
Module references:
Best Answer
The B- and Out- should not be connected under any circumstance when using the DW01 type TP4056. The B- ground reference will be connected to Out- as long as the DW01 has not disabled the Output power.