Gentlemen;
I am in the process of manufacturing a new battery pack using the bq20z655-R1 chip. I am currently having a problem with the discharge FET not turning on because of an OT2D flag in the Safety Status 2 block. The problem is that I am not using TS2 in this design. Currently I have the TS2 input grounded (the same procedure I have used previously with the bq20z90V150 chip), and the Operation Cfg A register, low byte, bits 4 and 3, set to 01 (TS1 input). Is there a difference in the way the 20z655 responds to unused thermistor inputs?
Also, in the initial setup of the #1 board, I am finding a severe error in the voltage calibration. with a (simulated) cell stack voltage of 14.0V applied, the pack is reading 15.88V. I attempted to run a voltage calibration from the PRO screen and got a 5024 voltage gain calibration overflow error. Any guesses as to what might be going on here?