BQ79631 Series
Automotive high-voltage battery pack monitor with voltage, current and insulation resistance sensing
Manufacturer: Texas Instruments
Link to Manufacturer Page: https://www.ti.com/
Catalog
Automotive high-voltage battery pack monitor with voltage, current and insulation resistance sensing
| Part | Operating Temperature [Max] | Operating Temperature [Min] | Mounting Type | Supplier Device Package | Number of Cells | Function | Grade | Package / Case | Qualification | Interface |
|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments BQ79631PAPRQ1 | 125 °C | -40 °C | Surface Mount | 64-HTQFP (10x10) | 1 | Battery Monitor | Automotive | 64-PowerTQFP | AEC-Q100 | SPI, UART |
Key Features
• Qualified for automotive applicationsAEC-Q100 Qualified with the following results:Device temperature grade 1: –40°C to +125°C ambient operating temperature rangeDevice HBM ESD classification level 2Device CDM ESD classification level C4BFunctional Safety-CompliantDeveloped for functional safety applicationsDocumentation to aid ISO 26262 system designSystematic capability up to ASIL DHardware capability up to ASIL DDifferential voltage measurements with integrated filteringPack+ , Fuse, Link±, Charge± measureIsolation resistance voltage measurementIntegrated precision current measurementSupport low-side shunt resistorInsulation resistance monitoring capability8 GPIO inputs as IO, SPI, ADC, and temperature senseIsolated differential daisy-chain communication with optional ring architectureSimplifies BJB/BDU system by eliminating safety MCU, CAN transceivers, and multi-wire interfaceUART host interfaceSynchronized current and voltage measurementsStackable as well as syncs with other cell and UI monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), 12S (BQ79612-Q1, BQ79652-Q1) and BQ79631Built-in SPI masterQualified for automotive applicationsAEC-Q100 Qualified with the following results:Device temperature grade 1: –40°C to +125°C ambient operating temperature rangeDevice HBM ESD classification level 2Device CDM ESD classification level C4BFunctional Safety-CompliantDeveloped for functional safety applicationsDocumentation to aid ISO 26262 system designSystematic capability up to ASIL DHardware capability up to ASIL DDifferential voltage measurements with integrated filteringPack+ , Fuse, Link±, Charge± measureIsolation resistance voltage measurementIntegrated precision current measurementSupport low-side shunt resistorInsulation resistance monitoring capability8 GPIO inputs as IO, SPI, ADC, and temperature senseIsolated differential daisy-chain communication with optional ring architectureSimplifies BJB/BDU system by eliminating safety MCU, CAN transceivers, and multi-wire interfaceUART host interfaceSynchronized current and voltage measurementsStackable as well as syncs with other cell and UI monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), 12S (BQ79612-Q1, BQ79652-Q1) and BQ79631Built-in SPI master
Description
AI
BQ79631-Q1 provides high-accuracy measurement capable of measuring divided down voltages from high voltage nodes such as Pack+ (HV Battery Positive terminal), Fuse, Charge (Port), Link (Load) in a battery junction box (BJB) or battery disconnect unit (BDU) system. Key voltage measurements can make use of the integrated digital low-pass filters. The device has a highly accurate integrated current sense ADC capable of measuring current in low-side shunt resistor. The device is capable of measuring the insulation resistance with internal ADC and able to control any switching scheme needed for this measurement. There are eight GPIOs/auxillary inputs that can be used for thermistor measurement, driving relays, measuring voltages, and being a master SPI interface to peripheral SPI devices. The isolated bi-directional daisy-chain ports support both capacitor or transformer based isolation. The device also supports communication over UART.
Host communication to the BQ79631-Q1 can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600-Q1. Additionally, an isolated, differential daisy-chain communication interface allows the host to communicate with the other UIR monitors and even cell monitors over a single interface. In the event of a communication line break, the daisy-chain communication interface is configurable to a ring architecture that allows the host to talk to devices at either end of the stack.
BQ79631-Q1 provides high-accuracy measurement capable of measuring divided down voltages from high voltage nodes such as Pack+ (HV Battery Positive terminal), Fuse, Charge (Port), Link (Load) in a battery junction box (BJB) or battery disconnect unit (BDU) system. Key voltage measurements can make use of the integrated digital low-pass filters. The device has a highly accurate integrated current sense ADC capable of measuring current in low-side shunt resistor. The device is capable of measuring the insulation resistance with internal ADC and able to control any switching scheme needed for this measurement. There are eight GPIOs/auxillary inputs that can be used for thermistor measurement, driving relays, measuring voltages, and being a master SPI interface to peripheral SPI devices. The isolated bi-directional daisy-chain ports support both capacitor or transformer based isolation. The device also supports communication over UART.
Host communication to the BQ79631-Q1 can be connected via the device’s dedicated UART interface or through a communication bridge device, BQ79600-Q1. Additionally, an isolated, differential daisy-chain communication interface allows the host to communicate with the other UIR monitors and even cell monitors over a single interface. In the event of a communication line break, the daisy-chain communication interface is configurable to a ring architecture that allows the host to talk to devices at either end of the stack.