Device Overview
BQ79631PAPRQ1 is an automotive high-voltage battery-pack monitor for BJB/BDU measurement functions. It supports differential voltage measurement at Pack, Fuse, Link, Charge and insulation-monitoring nodes, plus integrated precision low-side shunt current measurement. Eight auxiliary GPIO inputs, isolated bidirectional daisy-chain communication, UART host communication and an integrated SPI master support system integration.
Confirmed Technical and Ordering Data
| Parameter | Confirmed value | Scope / condition |
|---|---|---|
| Device Function | Automotive high-voltage battery pack monitor | voltage, current and insulation-resistance sensing |
| Voltage Measurement | Pack+, Fuse, Link+/-, Charge+/- and insulation nodes | differential measurement with digital filtering |
| Current Measurement | Integrated precision ADC for low-side shunt | |
| Insulation Monitoring | Integrated | resistance-monitoring measurement/control |
| Gpio Aux | 8 inputs | IO, SPI, ADC and temperature sensing |
| Daisy Chain | Isolated bidirectional differential | optional ring architecture |
| Host Interface | UART | |
| Spi Master | Integrated | |
| Synchronization | Simultaneous current and voltage measurement | |
| Qualification | AEC-Q100 grade 1; functional-safety documentation | supports ASIL-D system design |
| Package | HTQFP-64 (PAP) | 1000-piece LARGE T&R |
| Temperature Range | -40 to 125 °C | exact orderable/package option |
Engineering Selection Guidance
This device is aimed at high-voltage pack-level sensing rather than per-cell monitoring alone. Pack, Fuse, Link and Charge voltage measurements, low-side shunt current measurement and insulation-resistance monitoring form separate measurement functions that should be mapped to the BJB/BDU schematic individually. The isolated bidirectional daisy chain can be arranged as a ring, which matters for communication architecture and fault tolerance. UART host connectivity and the built-in SPI master serve different external interfaces, while the eight auxiliary inputs can support IO, ADC, temperature or SPI-related functions.
Lifecycle and Procurement
Texas Instruments lists BQ79631PAPRQ1 as Active in the current exact-part information. This exact orderable uses the HTQFP-64 (PAP) package with LARGE T&R packing and a package quantity of 1000. Lifecycle status does not indicate HKEQGOO stock, lead time, MOQ, or final availability.
