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[TI chip] BQ79731PHPRQ1 Voltage battery pack monitor for HV automotive BMS applications

[TI chip] BQ79731PHPRQ1 Voltage battery pack monitor for HV automotive BMS applications

Source:本站Time:2025-08-30Views:

The BQ79731PHPRQ1 is a high-voltage battery management System (BMS) monitor from Texas Instruments, which is mainly used for high-voltage battery system monitoring of electric vehicles, plug-in hybrid electric vehicles and hybrid electric vehicles. Th…

The BQ79731PHPRQ1 is a high-voltage battery management System (BMS) monitor from Texas Instruments, which is mainly used for high-voltage battery system monitoring of electric vehicles, plug-in hybrid electric vehicles and hybrid electric vehicles. The following mainly introduces its core features:

The BQ79731PHPRQ1 is designed to comply with the temperature range of AEC-Q100 standard: -40°C to +125°C

Comply with functional safety standards

Documentation, assisting in the design of the ISO 26262 system

The system capability is as high as ASIL D

The hardware capability is up to ASIL D

17 single-ended voltage channels

The measurement accuracy of high-voltage piezoelectric groups, connections and charging has been updated to 0.2%

The battery pack and battery VI are synchronized to 64µS

Two independent current-detection ADCs

±0.15% gain error drift

Input range: ±275mV

Comprehensive Coulometric count

Two overcurrent detection comparators

±1% accuracy

Selectable bidirectional thresholds

Programmable OC

15 GPIO inputs are used for IO, I2C, SPI, ADC and temperature detection

Dedicated MOSFET switch driver pin

Intelligent SPI Controller HUB

Supports multiple SPI peripheral devices

The HW pin used to trigger the contactor driver and the Pyro fuse driver

Stackable, register mapping compatible with bq7971x-Q1 cell displays


Chip details

BQ79731PHPRQ1 can be used to measure high-voltage voltage dividers in battery systems. It can measure the voltage across fuses and contactors, and check the isolation voltage in the battery junction box (BJB) system. The BQ79731PHPRQ1 features two integrated current detection paths that support low-side shunt resistors. The coulomb counting function can be used for precise SOC calculations. There are 15 GPIO/ auxiliary inputs available for high-voltage measurement, thermistor measurement and driving relays. There are 4 SW outputs available for driving the MOSFET switch in the measurement path. The BQ79731PHPRQ1 can be used as an SPI hub and connected to up to 8 independent SPI devices/groups. The HW pin can be used to autonomously implement overcurrent protection response, so as to provide rapid protection in dangerous overcurrent events. The isolated bidirectional daisy-chain port supports isolation based on capacitors and transformers. The BQ79731PHPRQ1 can also communicate with the MCU via SPI and UART.


Typical applications

The BQ79731PHPRQ1 is suitable for all-electric vehicles, plug-in hybrid vehicles and hybrid electric vehicles. It can measure the voltage across high-voltage voltage dividers, fuses and contactors, and check the isolation voltage of the battery junction box (BJB) system.


Performance parameters

Function: Battery monitor

Battery chemical composition: Multi-chemical

Number of batteries: 1

Fault protection: Overcurrent

Interface: SPI

Operating temperature: -40°C to 125°C

Grade: Automotive grade

Qualification: AEC-Q100

Installation type: Surface mount type

Packaging/Housing: 48-HTQFP (7x7)


If you need the BQ79731PHPRQ1 product, please feel free to contact us

Telephone: +86 13410018555 (Mr. Chen)

Email: sales@hkmjd.com

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