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BQ76940

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9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)

Data sheet
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9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)

BQ76940

ACTIVE
Data sheet Order now

Product details

Parameters

Number of series cells (Min) 9 Vin (Max) (V) 75 Number of series cells (Max) 15 Features Low side driver, Over-current in discharging protection, Short current detection Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other Battery monitors & balancers

Package | Pins | Size

TSSOP (DBT) 44 71 mm² 11.15 x 6.4 open-in-new Find other Battery monitors & balancers

Features

  • AFE monitoring features
    • Pure digital interface
    • Internal ADC measures cell voltage, die temperature, and external thermistor
    • A separate, internal ADC measures pack current (coulomb counter)
    • Directly supports up to three thermistors (103AT)

  • Hardware protection features
    • Overcurrent in Discharge (OCD)
    • Short Circuit in Discharge (SCD)
    • Overvoltage (OV)
    • Undervoltage (UV)
    • Secondary protector fault detection
  • Additional features
    • Integrated cell balancing FETs
    • Charge, discharge low-side NCH FET drivers
    • Alert interrupt to host microcontroller
    • 2.5-V or 3.3-V output voltage regulator
    • No EEPROM programming necessary
    • High supply voltage absolute maximum (up to 108 V)
    • Simple I2C compatible interface (CRC option)
    • Random cell connection tolerant

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Description

The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete pack monitoring and protection solution for next-generation, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks within the IC may be enabled or disabled to control the overall chip current consumption, and a SHIP mode provides a simple way to put the pack into an ultra-low power state.

The bq76920 device supports up to 5-series cells or typical 18-V packs, the bq76930 handles up to 10-series cells or typical 36-V packs, and the bq76940 works for up to 15-series cells or typical 48-V packs. A variety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium iron phosphate, and more. Through I2C, a host controller can use the bq769x0 to implement many battery pack management functions, such as monitoring (cell voltages, pack current, pack temperatures), protection (controlling charge/discharge FETs), and balancing. Integrated A/D converters enable a purely digital readout of critical system parameters, with calibration handled in TI’s manufacturing process.

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Technical documentation

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Type Title Date
* Datasheet bq769x0 3-series to 15-series cell battery monitor family for li-ion and phosphate applications datasheet (Rev. H) Mar. 06, 2019
White papers 以工業電池組為運輸替代方案提供電源 Mar. 17, 2020
White papers 산업용 배터리 팩을 통해 수송 수단에 대체 전력 공급 Mar. 17, 2020
White papers Powering Alternative Forms of Transportation with Industrial Battery Packs Feb. 19, 2020
Technical articles Fast and furious: designing longer-lasting 16S-17S Li-ion battery packs for e-motorcycles Nov. 21, 2019
Technical articles Protector, monitor or gauge – selecting the correct battery electronics for your Li-ion-powered system Jun. 13, 2019
Application notes BQ769x0 Pin Equivalent Diagrams (Rev. A) Apr. 03, 2019
Technical articles Power to the pedal: Achieving longer-lasting 13S, 48-V lithium-ion battery packs for e-bikes and e-scooters Mar. 07, 2019
User guides bq76930 and bq76940 Evaluation Module (Rev. C) Dec. 10, 2018
Application notes UART-Based Communication Protocol for Intermodule Communication of Light Vehicle May 17, 2017
Application notes bq769x0 BMS Configurations for Cordless Appliances Mar. 23, 2017
Application notes Fault Monitoring for High-Availability Systems using the bq769x0 Feb. 03, 2017
Technical articles How active and passive cell balancing works Oct. 05, 2016
Application notes Embedded Scheduler in Cell Battery Monitor of the bq769x0 Aug. 10, 2016
Application notes bq769x0 Family Top 10 Design Considerations (Rev. A) May 02, 2016
Application notes bq769x0 boot switch alternatives Dec. 21, 2015
Application notes I2C Communication Sample Code for the bq76940 with CRC Based on the MSP430 (Rev. B) May 14, 2014
User guides bq76920, bq76930, bq76940 AFE FAQ May 07, 2014

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
249
Description

The bq76940EVM is a populated circuit board for evaluation of the bq76940 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 9 to 15-series Lithium Ion, Lithium iron phosphate, and more battery (...)

Features
  • Bq7694000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation
View details

Software development

FIRMWARE Download
SLUC583.ZIP (12 KB)
SUPPORT SOFTWARE Download
SLUC539A.ZIP (2752 KB)

Reference designs

REFERENCE DESIGNS Download
Multi-Cell 36-48V Battery Management System Reference Design
TIDA-00792 — The TIDA-00792 TI Design provides monitoring, balancing, primary protection and gauging for a 12 to 15 cell lithium-ion or lithium-iron phosphate based batteries. This board is intended to be mounted in an enclosure for industrial systems. The reference design subsystem provides battery protection (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
16S-17S Battery pack reference design with low current consumption
TIDA-010074 — This reference design is a low standby and low ship mode current consumption 16S-17S LiFePO4 Li-ion battery pack design for telecom battery backup and emotorcycles. It was implemented for a 2-layer PCB. The 9S-15S AFE bq76940 monitors the lower 15 cells voltage and a two-channel general purpose (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Accurate gauging and 50-μA standby current, 13-S, 48-V li-ion battery pack reference design
TIDA-010030 — This reference design is a low standby and ship mode current consumption and high SOC gauging accuracy 13S, 48-V Li-ion battery pack design. It monitors each cell voltage, pack current and temperature with high accuracy and protects the Li-ion battery pack against overvoltage, undervoltage, over (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
15 Cell Lithium Ion Battery Controller Analog Front End Reference Design
TIDA-00255 — The TIDA00255 reference design utilizes the bq76940 analog front end (AFE) IC.  It measures cell voltages, and die temperature or external thermistor voltage using a 14 bit ADC.  Current is measured separately by a separate 16 bit coulomb counter.  The design can turn off low side (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (DBT) 44 View options

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