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Texas Instruments ADS131B24-Q1 High-Voltage Battery Pack Monitor

Texas Instruments ADS131B24-Q1 High-Voltage Battery Pack Monitor is a fully integrated monitor for automotive electrical vehicle (EV) battery management systems (BMS). The ADS131B24-Q1 integrates two simultaneous-sampling, high-precision, 24-bit ADC channels (ADC1A, ADC1B) to redundantly measure battery current with high resolution and accuracy using an external shunt resistor. Two independent digital comparators enable fast overcurrent detection in parallel with the two ADCs.

Additional two multiplexed, 16-bit ADC channels (ADC2A, ADC2B) are available to measure shunt temperature and other voltages in the system, such as battery-pack voltage, using external high-voltage resistor dividers. Shunt temperature is measured using an external temperature sensor, such as a thermistor or an analog output temperature sensor. Each ADC is equipped with a channel sequencer that automatically steps through the configured multiplexer inputs to reduce communication on the SPI.

The device integrates many monitoring and diagnostic features to mitigate and detect random hardware faults to aid in developing functionally safe BMS. Internal linear regulators with input range up to 16V support powering the device with unregulated DC/DC-converters. The Texas Instruments ADS131B24-Q1 is offered in a 48-pin HTQFP package and is specified over the automotive temperature range of -40°C to +105°C.

Features

AEC-Q100 qualified for automotive applications
- Temperature grade 1 (–40°C to +125°C, T_A)
Functional Safety-Compliant
- Developed for functional safety applications
- Documentation available to aid ISO 26262 functional safety system design up to ASIL D
- Systematic capability up to ASIL D
- Hardware capability up to ASIL D
Two simultaneous-sampling, 24-bit ADCs (ADC1A, ADC1B) for current-shunt measurements
- Programmable full-scale range
  - ±39mV to ±312.5mV
  - Supports a wide range of shunt resistor values and current-measurement ranges
- Achieve high-accuracy current-shunt measurements with
  - Offset error: ±1.5µV (max)
  - Gain drift: 20ppm/°C (max)
- Programmable data rate: 500SPS to 64kSPS
- Digital overcurrent comparator per ADC with programmable thresholds for fast overcurrent detection

Two multiplexed, 16-bit ADCs (ADC2A, ADC2B) for voltage and temperature measurements
- Eight analog inputs per ADC
- Programmable full-scale range: ±312.5mV to ±1.25V
- Channel sequencer
Monitoring and diagnostic features to mitigate and detect random hardware faults
2.9V to 16V supply-voltage range
SPI-compatible interface
Nine GPIOs with PWM capability

Applications

Automotive battery management systems (BMS)
- Current-shunt measurements
- Voltage measurements using external resistor dividers
- Temperature measurements using thermistors or analog output temperature sensors

Texas Instruments ADS131B24-Q1 High-Voltage Battery Pack Monitor

Features

Applications

EV BMS Battery Pack Monitor System Block Diagram

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