BQ79616PAPRQ1

The BQ79612-Q1, BQ79614-Q1, and BQ79616-Q1 can provide high-precision battery voltage measurements for 12S, 14S, and 16S battery modules in high-voltage battery management systems for HEV/EV in less than 200 μs. This series of monitors offers different channel options in the same package type, while providing pin-to-pin compatibility and supporting high reuse of existing software and hardware on any platform. With the integrated front-end filter, a simple, low-rated voltage differential RC filter can be used on the battery input channels to implement the system. The integrated post-ADC low-pass filter can perform filtered, DC-like voltage measurements for better state-of-charge (SOC) calculation. This device supports autonomous internal battery balancing and automatically pauses and resumes balancing by monitoring temperature to avoid overheating conditions. The included isolated bidirectional daisy-chain port supports isolation via capacitors and transformers and allows the use of the most effective components to implement the centralized or distributed architectures common in xEV powertrain systems. This device also includes eight GPIO or auxiliary inputs for external thermistor measurements. Host communication with the BQ7961x-Q1 series devices can be connected via the device's dedicated UART interface or the communication bridge device BQ79600. Additionally, the isolated differential daisy-chain communication interface allows the host to communicate with the entire battery pack through a single interface. In the event of a communication line interruption, the daisy-chain communication interface can be configured as a ring architecture, allowing the host to communicate with devices at both ends of the stack.

Applications

• Battery Management System (BMS) in hybrid and electric powertrain systems
• Energy storage battery packs with BMS

Key features

• AEC-Q100 compliant, device temperature grade 1: -40°C to +125°C ambient operating temperature range
• Device HBM ESD classification level 2
• Device CDM ESD classification level C4B
• Developed for functional safety applications, with documentation to support ISO 26262 system design; system can meet ASIL D requirements
• Hardware meets ASIL D requirements
• +/- 1.5mV ADC accuracy
• Pin/package and software compatible device family supporting stackable monitors 16S (BQ79616-Q1, BQ79656-Q1), 14S (BQ79614-Q1, BQ79654-Q1), and 12S (BQ79612-Q1, BQ79652-Q1), and standalone monitor 48V system (BQ75614-Q1)
• Built-in redundant paths for voltage and temperature diagnostics; performs highly accurate cell voltage measurements on all battery channels within 128μs
• Integrated post-ADC configurable digital low-pass filter with busbar connection and measurement support
• Host-controlled built-in hardware reset function simulating POR-like device reset
• Internal cell balancing support
• Embedded fault and detection signals transmitted over communication lines
• UART/SPI host interface/communication bridge device BQ79600 with built-in SPI master