Other Parts Discussed in Thread: BQ25700A, BQ4050, BQSTUDIO
Tool/software:
Hi,
I had posted a similar question with BQ4050EVM as the tagged part number. I was suggested to post another thread with BQ25700AEVM as the part number:
I have set up the BQ4050EVM and BQ25700A EVM boards in the following manner,
The power supply is set at 15V at max current limit of 2A
I have configured the BQ4050 parameters according to my battery specifications and carried out voltage and temperature calibrations. I have not performed the CEDV calibration since fuel gauge accuracy over temperature is not a priority for me at the moment.
The batteries I am using are currently discharged, and I am trying to charge them using this setup, and then discharge, to get the fixed EDV coefficients. There is no load connected to the VSYS pin on the BQ25700EVM, but I'm able to measure 10.9V across the VSYS pin.
When reading the ChargeCurrent register from the BQ25700EVM using BQStudio, I see a charging current of 1344 mA. However, when measuring the current using an ammeter placed between VBAT (battery system) and the fuel gauge, I only observe very low current (50-150 mA).
I read some of the registers off the BQ25700AEVM:
As suggested in the other post, the charge FETs of BQ4050 are being closed. Why am I not seeing the expected 1344 mA charging current?
