Dear Forum,
I recently ordered a bunch of TI battery gauges, and I started work with a BQ-27441-EVM-G1B. It is a system side impedance track fuel gauge. Although it is an old design, I got it, so that I can interface it with a charger I previously had - BQ-24261-EVM.
When I first connected the device, everything seemed fine. I saw the un-boxing video and found that I didnt have the necessary BIN-pin 10kOhm resistor which I ordered and connected. I had updated firmware on my EV-2400 to the latest v0.18 and connected it to the gauge using an I2C cable. On the PC I am using bqStudio v 1.3.45 and chose the gauge option on startup with number BQ-27441-G1B (9.5 or something ?? ).
When I connected the fuel gauge, to a Li-ion battery that I had - specs - 750mAh - ICR14500 ( http://www.amazon.com/2000mah-Rechargeable-Li-ion-Battery-Ultrafire/dp/B00BQYNC9U ) - the uC on the board started heating up out of bounds so much so that I almost burnt my finger when I accidentally touched it. And this was before I had even connected my charger or any load across the corresponding pins.
Is this normal ? Kindly help me diagnose the issue.
Also, in a previous attempt without attaching the BIN pin resistor, I had attached the same battery to the gauge and operated bqStudio when it did detect the board and reported the battery voltage accurately. I clicked on the "Commands" set on the right tab, and clicked on all them, probably even "SHUTDOWN", "SEALED" etc. just to see what it did. I think after this point the gauge stopped communicating with the software. I later, tried running "UN-SEAL", "RESET" etc., but the communication didnt go through. After which I have had the heating problem.
- Thanks and Regards,
Chintan Pathak
Scholar,
University of Washington.