Hello,
We have an application for the bq78PL114S12, using a 1mOhm current sense resistor, where there can be occasional 2-5sec bursts of discharge current at 120A-150A levels. Is there a possibility of damage to the chip at these levels? Checking the data sheet, it appears that the current sense inputs can easily handle the 0.15V input, but I wanted to be sure.
How does the coulomb counter handle any current levels that cause the sense inputs to go above the rated max., 0.1V, for a 1mOhm resistor? Is the incoming signal "clipped" and the chip assumes it's only 111A for the time that's it's actually above 100A? Or does it stop counting, reset, or otherwise misbehave?
Since these high-current bursts are fairly rare and the chip can "catch up" at a later point in the charge or discharge cycle of the battery pack, we're hoping it just counts our high-amp pulses as 111A and continues on. This would give us an accurate enough value until the chip can correct the actual charge level a later time.
Well, actually, we're hoping that it would still keep counting coulombs even at 150A. But, we're pretty sure that there wouldn't be a 0.1V limit on the input then. :)
Thank You!
