Описание
The bq2013H Gas Gauge IC is intendedfor battery-pack installation tomaintain an accurate record of a battery’savailable charge. The IC monitorsa voltage drop across a sense resistorconnected in series between thenegative battery terminal and groundto determine charge and discharge activityof the battery. The bq2013H isdesigned for high cpaacity batterypacks used in high-discharge rate systems.Battery self-discharge is estimatedbased on an internal timer and temperaturesensor. Compensations forbattery temperature, rate of charge,and self-discharge are applied to thecharge counter to provide availablecapacity information across a widerange of operating conditions. Initialbattery capacity, self-discharge rate,display mode, and charge compensationare set using the PROG1-6 pins.Actual battery capacity is automatically“learned” in the course of a dischargecycle from full to empty.Nominal available charge may bedirectly indicated using a five-segmentLED display. These segmentsare used to graphically indicatenominal available charge.The bq2013H supports a simplesingle-line bi-directional serial link toan external processor (commonground). The bq2013H outputs batteryinformation in response to externalcommands over the serial link. Tosupport battery pack testing, theoutputs may also be controlled bycommand. The external processormay also overwrite some of thebq2013H gas gauge data registers.The bq2013H may operate directlyfrom four nickel cells or three leadacid. With the REF output and anexternal transistor, a simple, inexpensiveregulator can be built to provideVCC from a greater number of cells.Internal registers include availablecharge, temperature, capacity, batteryID, and battery status.
- Accurate measurement of available charge in rechargeable batteries
- Designed for electric assist bicycles and other applications
- Measures a wide dynamic current range
- Supports NiCd, NiMH or lead acid
- Designed for battery pack integration
- – 120µA typical standby current (self-discharge estimation mode)
- – Small size enables implementations in as little as 12 square inch of PCB
- Direct drive of LEDs for capacity display
- Automatic charge and selfdischarge compensation using internal temperature sensor
- Simple single-wire serial communications port for subassembly testing
- 16-pin narrow SOIC
