His tech memo on using primary batteries with bq27 series gauges would be very helpful to me if it was updated for the bq34z100 gauge. I due to current hardware, I am committed to the bq34z100 part.
In the short term using a particular battery is the goal, but longer term, using the gauge as a coulomb counter, being independent of battery chemistry is the goal.
Having a software command to set available capacity when a fresh battery is connected seems crucial and I am hoping is an un-documented capability of the bq34z100.
Along same train of thought, Any chance the bq34Z100 can be changed to run algorithms of the bq2x00 series parts?
thanks
Perry
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SLUA367–December 2005
Using the bq27x00 With a Primary Cell Battery
Bill Jackson ................................................................................................................ Portable Power
ABSTRACT
The bq27x00 contains an accurate coulomb counter and has algorithms to determine
the available capacity and to dynamically compensate the available capacity for
temperature and discharge rate. If direct drive from the gauge to an LED display is not
required, the bq27x00 can be used as a complete gas gauge solution for a primary cell
battery. Although the bq27x00 was designed for a single-cell rechargeable lithium-ion
or lithium-polymer battery, it can be used for any primary cell chemistry because
charging efficiency is not important and algorithms specific to the lithium chemistry are
not needed. It also can be used with a multicell battery with the addition of an external
LDO to provide a regulated Vcc and a voltage divider or active attenuator to provide
voltage to the BAT input. The bq27x00 automatically enters low-power sleep mode if a
communication line is low for at least 20 seconds. The gauge can provide
time-to-empty (TTE) in minutes, nominal available charge (NAC), relative
state-of-charge (RSOC), and many other parameters.