Hello,
After reviewing the Bq20z65-R1 TRM, I'm confused about the current settings we can use to have the gauge wake from sleep. We will be operating without a host and will set the gauge to Sleep when there's almost no current flowing. Typical current draw from the pack is 30mA-350mA with occasional 1.5A pulses. Pack will be charged at 2A. Sense resistor is 10mOhm.
TRM Section C.9.1.7 references setting the current threshold for going to Sleep. It also mentions that if the current rises above the set threshold, the gauge will return to Normal mode.
TRM Section C.9.1.13 references setting the current threshold to wake the gauge. It seems that only two current settings can be used, 0.5A or 1A.
Which setting determines the current flow that will wake the gauge?
If it's the Wake Current Reg, I have a big problem because the current from the pack in our application can remain below 0.5A for a considerable time before a 1.5A pulse occurs. We'd like to set the wake current level to about the same level we would use to go to sleep, 10mA.
It seems that the Wake Current Reg could be fooled by telling it we are using a 2.5mOhm resistor. This would result in the gauge thinking that 0.5A was flowing when only 125mA was being drawn from the pack. But, even that is about 10x higher a current threshold than we want.
or...
We could prevent the gauge from sleeping. But that would raise the quiescent current level significantly, greatly reducing the pack's run time.
Thank you for any help you can offer!