SLUSF55A December   2022  – October 2024 BQ79731-Q1

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Device and Documentation Support
    1. 4.1 Device Support
      1. 4.1.1 Third-Party Products Disclaimer
    2. 4.2 Documentation Support
      1. 4.2.1 Related Documentation
    3. 4.3 Receiving Notification of Documentation Updates
    4. 4.4 Support Resources
    5. 4.5 Trademarks
    6. 4.6 Electrostatic Discharge Caution
    7. 4.7 Glossary
  6. 5Revision History
  7. 6Mechanical, Packaging, and Orderable Information
    1. 6.1 Package Option Addendum
    2. 6.2 Tape and Reel Information
    3. 6.3 Mechanical Data

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

3 Description

The device can be used to measure divided down high voltage nodes in a battery system. It can measure voltage across Fuse, Contactors and check isolation voltage in a battery junction box (BJB) system. The device has two integrated current sense (BQ79731-Q1) paths supporting low-side shunt resistor. Coulomb counting (BQ79731-Q1) function is available for accurate SOC calculation. There are 15 GPIOs/auxiliary inputs that can be used for HV measurements, thermistor measurements, and driving relays. There are four SW outputs that can be used to drive MOSFET switches in the measurement path. The device can function as a SPI HUB and interface with up to eight separate SPI devices/groups. Over current protection response can be achieved autonomously using HW pins for fast protection in dangerous over current events. The isolated bi-directional daisy chain ports support both capacitor and transformer based isolation. The device can also communicate with MCU over SPI and UART.

Device Information
PART NUMBERPACKAGE (1)BODY SIZE (NOM)
BQ79731-Q1PHP (HTQFP 48-pin)7mm × 7mm
(1) For all available packages, see Section 6

BQ79731-Q1 Simplified System Diagram

Simplified System Diagram