Texas Instruments bq7965x-Q1 Battery Monitor, Balancer & Protector

Texas Instruments bq7965x-Q1 Battery Monitor, Balancer & Hardware Protector provides high-accuracy cell voltage measurements for a minimum of 6S to a maximum of 16S battery modules in less than 200µs. The bq79652-Q1 (12S), bq79654-Q1 (14S), or bq79656-Q1 (16S) also supports shunt-resistor current sense measurement. The integrated front-end filters enable the system to implement 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. The bq7965x-Q1 also supports integrated current sensing capabilities with the option to synchronize with cell voltage measurements for a better state of charge (SOC) calculation. The device supports autonomous internal cell balancing with temperature monitoring to auto-pause and resumes balancing to avoid an overtemperature condition.

The inclusion of the isolated, bidirectional, daisy chain ports supports both capacitor- and transformer-based isolation, allowing the use of the most effective components for centralized or distributed architectures commonly found in the xEV powertrain system. The bq7965x-Q1 also includes eight GPIOs or auxiliary inputs that can be used for external thermistor measurements.

Host communication to the Texas Instruments bq7965x-Q1 family of devices can be connected via the device’s dedicated UART interface or through a communication bridge device, bq79600. Additionally, an isolated differential daisy-chain communication interface allows the host to communicate with the entire battery stack 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.

Features

Qualified for automotive applications
AEC-Q100 Qualified with the following results
- –40°C to +125°C ambient operating temperature range grade 1
- 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 16S (bq79616-Q1, bq79656-Q1), 14S (bq79614-Q1, bq79654-Q1), and 12S (bq79612-Q1, bq79652-Q1)
- Standalone monitor 48 V system (bq75614-Q1)
Supports current-sense measurement
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
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 240mA
- Built-in balancing thermal management with automatic pause and resume control
Isolated differential daisy chain communication with an optional ring architecture
Embedded fault signal and heartbeat through a communication line
5V LDO output to power external digital isolator
UART/SPI host interface/communication bridge device bq79600-Q1
Built-in SPI master