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BQ76940

ACTIVE

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

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Data sheet

BQ76940

ACTIVE
Data sheet Order now

Product details

Number of series cells (min) 9 Vin (max) (V) 75 Features Digital output, LDO output, Low-side driver, Overcurrent in discharging protection, Short-current detection Device type Cell monitor and balancer Number of series cells (max) 15 Operating temperature range (°C) -40 to 85 Rating Catalog Battery overvoltage protection (min) (V) 3.15 Battery overvoltage protection (max) (V) 4.7 Communication interface I2C Operating current (typ) (µA) 40
Number of series cells (min) 9 Vin (max) (V) 75 Features Digital output, LDO output, Low-side driver, Overcurrent in discharging protection, Short-current detection Device type Cell monitor and balancer Number of series cells (max) 15 Operating temperature range (°C) -40 to 85 Rating Catalog Battery overvoltage protection (min) (V) 3.15 Battery overvoltage protection (max) (V) 4.7 Communication interface I2C Operating current (typ) (µA) 40
TSSOP (DBT) 44 71.36 mm² 11.15 x 6.4
  • 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
  • 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

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 Li-ion, Li-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.

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 Li-ion, Li-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
* Data sheet BQ769x0 3-Series to 15-Series Cell Battery Monitor Family for Li-Ion and Phosphate Applications datasheet (Rev. I) PDF | HTML 14 Mar 2022
User guide bq76920, bq76930, bq76940 AFE FAQ (Rev. A) PDF | HTML 01 Oct 2021
White paper 以工業電池組為運輸替代方案提供電源 17 Mar 2020
White paper 산업용 배터리 팩을 통해 수송 수단에 대체 전력 공급 17 Mar 2020
White paper Powering Alternative Forms of Transportation with Industrial Battery Packs 19 Feb 2020
Technical article Fast and furious: designing longer-lasting 16S-17S Li-ion battery packs for e-motorcycles 21 Nov 2019
Technical article Protector, monitor or gauge – selecting the correct battery electronics for your Li-ion-powered system 13 Jun 2019
Application note BQ769x0 Pin Equivalent Diagrams (Rev. A) 03 Apr 2019
Technical article Power to the pedal: Achieving longer-lasting 13S, 48-V lithium-ion battery packs for e-bikes and e-scooters 07 Mar 2019
User guide bq76930 and bq76940 Evaluation Module (Rev. C) 10 Dec 2018
Application note UART-Based Communication Protocol for Intermodule Communication of Light Vehicle 17 May 2017
Application note bq769x0 BMS Configurations for Cordless Appliances 23 Mar 2017
Application note Fault Monitoring for High-Availability Systems using the bq769x0 03 Feb 2017
Technical article How active and passive cell balancing works 05 Oct 2016
Application note Embedded Scheduler in Cell Battery Monitor of the bq769x0 10 Aug 2016
Application note bq769x0 Family Top 10 Design Considerations (Rev. A) PDF | HTML 02 May 2016
Application note bq769x0 boot switch alternatives 21 Dec 2015
Application note I2C Communication Sample Code for the bq76940 with CRC Based on the MSP430 (Rev. B) 14 May 2014

Design & development

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

Evaluation board

BQ76940EVM — BQ76940 evaluation board with BQ78350

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 (...)

User guide: PDF
Not available on TI.com
Firmware

SLUC583 — bq769x0 I2C Sample Code With CRC

Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
BQ76920 — 3 to 5-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) BQ76930 — 6 to 10-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) BQ76940 — 9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)
Download
Support software

SLUC539 — bq76940/bq76930/bq76920 Evaluation Software

Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
BQ76920 — 3 to 5-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) BQ76930 — 6 to 10-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family) BQ76940 — 9 to 15-series cell li-ion and li-phosphate battery monitor (bq76940 family)
Hardware development
Evaluation board
BQ76920EVM — BQ76920 evaluation board with BQ78350  BQ76930EVM — BQ76930 evaluation board with BQ78350 BQ76940EVM — BQ76940 evaluation board with BQ78350
Download
Reference designs

TIDA-010030 — Accurate gauging and 50-μA standby current, 13-S, 48-V li-ion battery pack reference design

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00792 — Multi-Cell 36-48V Battery Management System Reference Design

This reference 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 provides battery protection and gauging (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010074 — 16S-17S Battery pack reference design with low current consumption

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00255 — 15 Cell Lithium Ion Battery Controller Analog Front End Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Package Pins Download
TSSOP (DBT) 44 View options
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