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Product details

Parameters

Number of series cells (Min) 3 Features Cell balancing, High-side driver, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overcurrent in charging protection, Overcurrent in discharging protection, Overtemperature protection, Overvoltage protection, Programmable EEPROM or EPROM, Short-current detection, Temperature sensing, Undertemperature protection, Undervoltage protection Vin (Max) (V) 55 Number of series cells (Max) 10 Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other Battery monitors & balancers

Package | Pins | Size

TQFP (PFB) 48 81 mm² 9 x 9 open-in-new Find other Battery monitors & balancers

Features

  • Battery monitoring capability for 3-series to 10-series cells
  • Integrated charge pump for high-side NFET protection with optional autonomous recovery
  • Extensive protection suite including voltage, temperature, current, and internal diagnostics
  • Two independent ADCs
    • Support for simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error < 1 µV (typical)
    • High-accuracy cell voltage measurement < 10  mV (typical)
  • Wide-range current applications (±200-mV measurement range across sense resistor)
  • Integrated secondary chemical fuse drive protection
  • Autonomous or host-controlled cell balancing
  • Multiple power modes (typical battery pack operating range conditions)
    • NORMAL mode: 286 µA
    • Multiple SLEEP mode options: 24 µA to 41 µA
    • Multiple DEEPSLEEP mode options: 9 µA to 10 µA
    • SHUTDOWN Mode: 1 µA
  • High-voltage tolerance of 85 V on cell connect and select additional pins
  • Tolerant of random cell attach sequence on production line
  • Support for temperature sensing using internal sensor and up to nine external thermistors
  • Integrated one-time-programmable (OTP) memory programmable by customers on production line
  • Communication options include 400-kHz I2C, SPI, and HDQ one-wire interface
  • Dual programmable LDOs for external system usage
  • 48-pin TQFP package (PFB)

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Description

The Texas Instruments BQ76942 is a highly integrated, high accuracy battery monitor and protector for 3-series to 10-series Li-ion, Li-polymer, and LiFePO‌‌‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍4 battery packs. The device includes a high-accuracy monitoring system, a highly configurable protection subsystem, and support for autonomous or host controlled cell balancing. Integration includes high-side charge-pump NFET drivers, dual programmable LDOs for external system use, and a host communication peripheral supporting 400-kHz I2C, SPI, and HDQ one-wire standards. The BQ76942 is available in a 48-pin TQFP package.

  • BQ76942—Configured default with 400 kHz I2C communications

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet BQ76942 3-Series to 10-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li- Polymer, and LiFePO4 Battery Packs datasheet Nov. 06, 2020
* User guide BQ76942 Technical Reference Manual Dec. 15, 2020
Application note Using Low-Side FETs with the BQ76952 Battery Monitor Family Jan. 19, 2021
Application note BQ76942 IEC ESD 61000-4-2 ESD Test Report Nov. 16, 2020
Application note BQ76942, BQ76952 Software Development Guide (Rev. A) Oct. 01, 2020
Application note BQ76952, BQ76942 Calibration and OTP Programming Guide Oct. 01, 2020
Application note Cell Balancing with BQ76952, BQ76942 Battery Monitors Oct. 01, 2020
Application note Easy Configuration of BQ76942/52 Battery Monitors (Rev. A) Oct. 01, 2020
Application note Multiple FETs with the BQ76952, BQ76942 Battery Monitors Sep. 21, 2020
Technical articles CURRENTly questioning the accuracy of your battery monitor? Improve battery safety and accuracy with these tips May 28, 2020
Technical articles Improving voltage measurement accuracy in battery monitoring systems Apr. 01, 2020
White paper 以工業電池組為運輸替代方案提供電源 Mar. 17, 2020
White paper 산업용 배터리 팩을 통해 수송 수단에 대체 전력 공급 Mar. 17, 2020
Technical articles Improving temperature measurement accuracy in battery monitoring systems Feb. 20, 2020
White paper Powering Alternative Forms of Transportation with Industrial Battery Packs Feb. 19, 2020
Application note Parallel Paths with the BQ769x2 Battery Monitor Jan. 09, 2020
Technical articles Next-generation battery monitors: how to improve battery safety while improving accuracy and extending runtime Jan. 05, 2020

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
249
Description

The BQ76942EVM evaluation module (EVM) is a complete evaluation system for the BQ76942, a 3-cell to 10-cell Li-Ion battery monitor integrated circuit. The EVM consists of a BQ76942 circuit module which is used for simple evaluation of the BQ76942 monitor function. The circuit module includes one (...)

Features
  • Complete evaluation system for the BQ76942 3-cell to 10-cell Li-Ion and Phosphate battery monitor
  • Populated circuit module for 10-cell configuration for quick setup
  • Communication available with included USB interface adapter or available on 4-pin connector
  • Resistor cell simulator for operation with (...)

Software development

APPLICATION SOFTWARE & FRAMEWORK Download
Battery Management Studio (bqStudio) Software
BQSTUDIO Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)
Features
  • Real-time Gauge Dashboard for monitoring basic registers
  • Full register access and logging
  • Full data memory access and logging
  • Product configuration and monitoring tools
  • Import and export of product configurations
  • Calibration and test automation
  • Export of FS files for the target production environment 
CODE EXAMPLE OR DEMO Download
SLUC701.ZIP (426 KB)

Design tools & simulation

CALCULATION TOOL Download
BQ76952/42 thermistor temperature optimizer - calculate the thermistors coefficients for T range
BQ769X2-THERMISTOR_COEFF_CALCULATOR — The BQ769x2 Thermistor Temperature Optimizer will calculate the thermistor coefficients for the specific thermistor used in your application, as described in the sections “Calibration:18K Temperature Model”,  “Calibration:180K Temperature Model” and “Calibration:Custom Temperature Model” of the TRM.
document-generic User guide

CAD/CAE symbols

Package Pins Download
TQFP (PFB) 48 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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