BQ4050: Cell Current Measurement

Mihon Lipa

Part Number: BQ4050
Other Parts Discussed in Thread: BQSTUDIO

Hello! While at rest, the current values of cells 1-4 (in BQStudio) change in time and can take values from -200 mV to + 200 mV. With what it can be connected?

over 5 years ago

0 Mihon Lipa over 5 years ago

Intellectual 390 points

I'm sorry, not mV, but mA ...

0 Onyx Ahiakwo over 5 years ago in reply to Mihon Lipa

TI__Guru* 76230 points

Hi Mihon,

Are you carrying out this test on bqstudio or your board? If an evm, run current calibration. If your board, can you check to make sure there isn't a short somewhere that is causing the current drain? Also, try performing current calibration as well

thanks

Onyx

0 Mihon Lipa over 5 years ago in reply to Onyx Ahiakwo

Intellectual 390 points

I use my board. Thanks for the tip, I will inspect the board for short circuits. Please tell me, maybe this is due to the fact that I do not use the indication and the corresponding microcircuit pins (20, 21 and 22) are hanging in the air? And can this be due to the fact that I have capacitors C19 and C20 marked DNP in the current shunt circuit?

0 Mihon Lipa over 5 years ago in reply to Mihon Lipa

Intellectual 390 points

Tell me, please, is there any minimum voltage value on the cells below which it is not recommended to perform current calibration? 
And yet - by what principle is the current calculated through each cell calculated and does the current shunt circuit affect this?

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BQ4050: Cell Current Measurement