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Texas Instruments bq75614-Q1 Automotive Precision Battery Monitor

Texas Instruments bq75614-Q1 Automotive Precision Battery Monitor integrates shunt-resistor current sense measurement with highly accurate cell voltage measurements within 128µs for all cell channels. The system utilizes integrated front-end filters to implement simple, low voltage rated, differential RC filters on the cell input channels. The integrated, post-ADC, low-pass filters allow filtered DC-like voltage measurements.

The TI bq75614-Q1 Automotive Precision Battery Monitor supports integrated current sensing capabilities with the option to synchronize with cell voltage measurements for a better state of charge (SOC) calculation. Additionally, the device features autonomous internal cell balancing with temperature monitoring to auto-pause and resume balancing to avoid an overtemperature condition.

The bq75614-Q1 provides eight GPIOs or auxiliary inputs intended for external thermistor measurements. Host communication is connected via the dedicated UART interface.

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
Functional Safety-Compliant
- Developed for functional safety applications
- Documentation to aid ISO 26262 system design
- Systematic capability up to ASIL D
- Hardware capability up to ASIL D
+/-1.5mV ADC accuracy
Pin-package and software compatible device family:
- Stackable monitor of 14S
- Standalone monitor 48V system
Supports current-sense measurement

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 128µs for all cell channels
Integrated post-ADC configurable digital low-pass filters
Built-in host-controlled hardware reset to emulate POR-like device reset
Supports internal cell balancing
- Balancing current at 240mA
- Built-in balancing thermal management with automatic pause and resume control
5V LDO output to power external digital isolator
UART host interface
Built-in SPI master

Applications

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

Texas Instruments bq75614-Q1 Automotive Precision Battery Monitor

Features

Applications

Simplified System Diagram

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