Texas Instruments BQ75614-Q1 | Demoboard BQ75614EVM

Description

The BQ75614-Q1 device provides high-accuracy cell voltage measurements up to 16S battery modules in less than 200 µs. The integrated front-end filters enable the system to implement with simple, low voltage raring, differential RC filters on the cell input channels. The integrated, post-ADC, low-pass filters enable filtered, DC-like, voltage measurements. Integrated current measurement with option to synchronize with cell voltage measurements for better state of charge (SOC) calculation. The device supports autonomous internal cell balancing with temperature monitoring to auto-pause and resume balancing to avoid an overtemperature condition. The device includes option to support fuse and relay open/close diagnostics. The device also includes eight GPIOs/auxiliary inputs that can be used for external thermistor measurements.

Features

• Qualified for automotive applications
• AEC-Q100 Qualified with the following results:
• 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
• SafeTI™-26262 ASIL-D compliance
• Cell voltage measurements
• Current measurement
• Temperature measurements
• Communication
• SafeTI™-26262 ASIL-B compliant
• OV, UV Protector (hardware comparators)
• OT, UT Protector (hardware comparators)
• Pin-package and software compatible device family:
• Stackable monitor 16S (BQ79616), 14S (BQ79614), and 12S (BQ79612)
• Standalone monitor 48 V system (BQ75614)
• Direct support on fuse and relay open and close diagnostics
• Built-in redundancy path for voltage and temperature and current diagnostics
• Highly accurate cell voltage measurements within 128 µs for all cell channels
• Integrated post-ADC configurable digital low-pass filters
• Supports bus bar connection and measurement
• Built-in host-controlled hardware reset to emulate POR-like device reset
• Supports internal cell balancing
• Balancing current at 240 mA
• Built-in balancing thermal management with automatic pause and resume control
• 5 V LDO output to power external digital isolator
• UART Host interface
• Built-in SPI master

Typical applications

• Automotive 48 V Li-Ion battery systems
• E-bikes, E-Scooters

More information

• Datasheet
• IC product information