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Product details

Parameters

Cell chemistry Lead Acid Battery capacity (Min) (mAh) 1000 Battery capacity (Max) (mAh) 327000 Implementation Pack External capacity indication LED Operating temperature range (C) -40 to 85 open-in-new Find other Battery fuel gauges

Package | Pins | Size

HTSSOP (DDW) 44 85 mm² 14 x 6.1 open-in-new Find other Battery fuel gauges

Features

  • Designed for Use with 12-V Lead Acid Batteries in Consumer UPS Systems
  • Programmable Cell Models for Enhanced Pb-Acid Gas Gauging Performance
  • Provides 10-LED Bar Graph of Run-Time Remaining During Discharge and
    % Capacity During Charge
  • Can Be Easily Integrated Into Battery Cover
  • Works with Pb-Acid Batteries Up to 327 Ah
  • Records Cumulative Usage Data Internally for Warranty Return Analysis
  • On-Chip Temperature Sensor
  • Data Interface for Retrieving Warranty Information
  • Fully Programmable Features and Thresholds via UART Serial Interface
  • State-of-Health (SoH) Determination and Status Reporting
  • Includes Configurable Audible Indicator for Low-Capacity, Low-Voltage,
    and Overvoltage Warnings
  • Addressable Commands for Use in Multi-Battery Systems
  • Optional Infra-Red Communications Interface
  • APPLICATIONS
    • Stand-Alone Uninterruptible Power Supplies
    • 12-V Pb-Acid Battery Monitors
    • Battery Warranty Data Logging Equipment

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Description

The bq78412 Pb-Acid Battery State-of-Charge (SoC) Indicator with Run-Time Display is a complete stand-alone battery gas-gauge solution designed for single 12V Pb-Acid batteries. The bq78412 displays remaining Run-Time-To-Empty during discharge and Percent (%) capacity during charge using a 10-LED (light-emitting diode) bar graph.

The bq78412 monitors battery voltage, current, and ambient temperature to calculate state-of-charge and determine remaining runtime-to-empty. Measured values can be recorded and tracked for later retrieval for warranty purposes.

Programmable cell models allow the bq78412 to be customized to a variety of Pb-Acid formulations and capacities.

Current measurements and Coulomb-counting for gas-gauging are also automatically performed by the bq78412. Current measurements use a small value sense resistor placed in the negative power path and calibrated in-circuit. This allows the precise, continuous, real-time calculation of battery capacity and run-time-to-empty values.

Temperature sensing augments gas-gauge and capacity information using a firmware algorithm to compensate for the temperature effects on capacity.

A serial port is available for configuring various programmable parameters including cell models, calibration values, serial number and date of manufacture. The serial port can operate an infra-red (IR) interface to allow connector-less data acquisition. The bq78412 is easily configurable, is fully programmed and requires no algorithm or firmware development

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet Pb-Acid Battery State-of-Charge Indicator datasheet Aug. 04, 2010
User guide BQ78412EVM Board Quick-Start Guide May 04, 2011
User guide BQ78412 Application Programming Interface Jan. 20, 2011

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Software development

SUPPORT SOFTWARE Download
SLUC256.ZIP (2257 KB)
SUPPORT SOFTWARE Download
SLUC257.ZIP (0 KB)

CAD/CAE symbols

Package Pins Download
HTSSOP (DDW) 44 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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