Texas Instruments BQ79631 | Demoboard BQ79631EVM

Description

TI's BQ79631EVM is an evaluation board for the BQ7963X-Q1 family of devices for use in EV/HEV applications to provide monitoring, protecting, and communications by measuring divided down high voltage in the battery junction box (BJB) or battery disconnect unit (BDU) system.The BQ79631EVM is equipped with 16 differential voltage sense inputs in order to measure across the battery pack, fuse, drive train link, and fast charging connections. The two voltage sense pins (VC14, VC15) connected to HV_Extra1_Plus and HV_Extra2_Plus may be used to measure other parameters within the HV system. An insulation detection circuit is also present on the BQ79631EVM to ensure that all high voltage networks areproperly insulated from low voltage ones. All differential voltage sense inputs are integrated post ADC in digital low pass filters.In addition to the voltage sense pins, the BQ79631EVM also has integrated current sense with a low shunt resistor. There are also 8 GPIOs/auxiliary inputs that can be used to measure additional voltages, NTC thermistors, and drive relays. Bi-directional daisy chain ports are also present on the BQ79631EVM and support capacitor, capacitor and choke, and transformer based isolation. Control a single EVM or multiple stacked EVMs using a PC-hosted GUI. Communication between the PC and the bridge device occurs via a USB2ANY UART interface. When using the BQ7963x in a system of other stacked BQ796XXEVM devices, communication between all other EVMs in the stack occurs via the isolated,daisy-chain differential communication bus.

Features

• Differential voltage measurements with integrated filtering
• Link ± voltage measurement for connection to drive train
• HV_Fuse voltage measurement to monitor a fuse that connects the battery pack to the rest of the BJB
• HV ± voltage measurement for connection to battery pack
• Charge ± voltage measurement for connection to charging port
• Two additional HV voltage measurements to monitor any other location in the HV system
• Insulation detection
• Isolated differential daisy chain communications with optional ring architecture
• 8 NTC/Auxiliary/GPIO channels
• UART interface
• Diagnostics
• Integrated current measurement
• Built-in host controlled hardware reset to emulate POR-like device reset

Typical applications

• Full Electric, Plug-In Hybrid, and Hybrid Vehicles

More information

• Datasheet