Hi,
I'm a little confused. My battery is a two terminal lead acid. I don't have battery - and pack-. Do I have this right, my battery will connect to pack- and battery+. So the bq34z100-g1 operates the current sense resistor drop above everything else on my board.
When I set my charger Voltage, it will be off by the drop across this current sense resistor. This is a deep discharge lead acid that is "fussy" about charge Voltage based on temperature being exactly right. As the charge current tapers off, the drop across the resistor will change. Does firmware have to constantly read the battery Voltage and change the charge Voltage to keep it correct across the battery?
So when SDA and or SCL pulls low. it will be the current sense drop higher than the ground of my microprocessor.
Probably not a problem as I don't expect my current sense drop to be more than 125 mV max. Is this essentially correct?
The schematics in the data sheet show the 5.6V communication line diodes connected to BAT- but the text actually says to connect them to PACK-, is this correct?
Note, I am not using any I2C buffers. But some of these I2C buffers work by having 2 different logic LO Voltages. These would absolutely be a problem in this system.