The bq2018 is a low-cost charge/discharge
counter peripheral packaged in
an 8-pin TSSOP or SOIC. It works
with an intelligent host controller, providing
state-of-charge information for
rechargeable batteries.
The bq2018 measures the voltage
drop across a low-value series sense
resistor between the negative terminal
of the battery and the battery
pack ground contact. By using the accumulated
counts in the charge,
discharge, and self-discharge registers,
an intelligent host controller can
determine battery state-of-charge information.
To improve accuracy, an
offset count register is available. The
system host controller is responsible
for the register maintenance by resetting
the charge in/out and selfdischarge
registers as needed.
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