Hi,
I am new to Battery management.I need to measure the battery remaining and guess the backup time for a LIPO 11.1 V, 5AH,3 cell battery.
I feel the fuel gauges are right technology for this application.
I have few doubts after seeing the specs of bq series:
1.It is mentioned that many of the bq series ICs are for single cell Li-ion,Is this means they for the small Li-ion Coin cell we use for RTC or many simple backup application?
2.Can I use the bq series ICs for fuel gauging of 11.1V 3 cell LIPO ?
3.Is it really matters to the chip how many cells are connected?I mean to me it is just a charge counter,amount of charge added and discharge taken out of the battery.Is this assumption correct?
4.Suppose we charge the Battery with external charger and then connected to the bq Gauge,how it comes to know how much is the charge available?
5.How fast the IC integrates the charge consumption?I mean for GSM/GPRS mobile application the RF hops are really fast and they are there for few mS but during that time only most of the power is consumed,does the ADC measures it that quickly?Is it a TRUE RMS current measurement?
6.What happens if the supply of ADC of the bq IC is also lower,I mean during GSM transaction there is a sudden fall in battery voltage, as around 2A load is taken for small duration which can be couple of C's of the battery and resulting poor voltage regulation from the battery and low voltage for bq.Which is ultimately working on the same battery?
