Texas Instruments bq79735-Q1 High-Voltage Battery Pack Monitor

Texas Instruments bq79735-Q1 High-Voltage Battery Pack Monitor can measure divided-down high-voltage nodes in a battery system. It can also measure the voltage across contractors, fuse, and check isolation voltage in a battery junction box (BJB) system.

There are 15 GPIOs/auxiliary inputs that can be used for thermistor measurements, HV measurements, and driving relays. Four SW outputs can be used to drive MOSFET switches in the measurement path. The device can function as an SPI HUB and interface with up to eight separate SPI devices/groups. The isolated bidirectional daisy chain ports support transformer-based and capacitor isolation. The device can also communicate with MCU over UART and SPI. Typical applications for the Texas Instruments bq79735-Q1 include fully electric, plug-in hybrid, and hybrid vehicles.

Features

AEC-Q100 qualified to –40°C to +125°C
Functional safety compliant
- Documentation to aid ISO 26262 system design
- Systematic capability up to ASIL D
- Hardware capability up to ASIL D
17 single-ended voltage channels
- High voltage pack, link, and charge measurement accuracy update to 0.2%
- Pack and cell VI sync to 64µS

15 GPIO inputs as IO, I²C, SPI, ADC, and temp sense
Dedicated MOSFET switch drive pins
Intelligent SPI contoller HUB
- Support multiple SPI peripheral devices
- HW pin to trigger contactor drivers and Pyro Fuse drivers
Stackable and register map compatible with bq7971x-Q1 cell monitors