bq2012 is a battery gas gauge IC from bq company. It is designed for battery pack or in-system installation to maintain an accurate record of available battery charge. The IC monitors a voltage drop across a sense resistor connected in series between the negative battery terminal and ground to determine charge and discharge activity of the battery. Self-discharge of NiMH and NiCd batteries is estimated based on an internal timer and temperature sensor. Compensations for battery temperature and rate of charge or discharge are applied to the charge, discharge, and self-discharge calculations to provide available charge information across a wide range of operating conditions. Battery capacity is automatically recalibrated, or “learned,” in the course of a discharge cycle from full to empty. The bq2012 includes a charge control output that, when used with other full-charge safety termination methods, ensures that the battery is charged to the maximum rated voltage.
The bq2012 Gas Gauge IC is designed for battery‑pack or in‑system use to maintain an accurate record of available charge. It measures voltage drop across a sense resistor to determine charge and discharge activity, compensates for temperature and self‑discharge, and provides a charge‑control output.
The device supports a single‑wire serial interface, LED display of nominal charge, and a range of programmable pins for full‑count selection, rate selection, and self‑discharge compensation. It operates from 3.0‑6.5 V and is available in a 16‑pin narrow SOIC package.
| Typical standby current | 120 µA |
|---|---|
| Supply voltage range | 3.0‑6.5 V |
| Package type | 16‑pin narrow SOIC |
| EDV early‑warning threshold | 1.05 V |
| EDV empty threshold | 0.95 V |
| Operating temperature range | -35 °C to +85 °C |
| LED display segments | 5‑ or 6‑segment |
The bq2012 draws a typical standby current of 120 µA.
EDV1 (early warning) is 1.05 V and EDVf (empty) is 0.95 V.
The device operates from 3.0 V to 6.5 V.
It is supplied in a 16‑pin narrow SOIC package.