1 Features

• AEC-Q100 qualified for automotive applications

– Temperature grade 1: –40°C to +125°C, TA

• 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:

• ±39 mV to ±312.5 mV

• Supports a wide range of shunt resistor

values and current-measurement ranges

– Achieve high-accuracy current-shunt

measurements with:

• Offset error: ±1.5 μV (max)

• Gain drift: 20 ppm/°C (max)

– Programmable data rate: 500 SPS to 64 kSPS

– Digital overcurrent comparator per ADC with

programmable thresholds for fast overcurrent

detection

• One multiplexed, 16-bit ADC (ADC2A) for voltage

and temperature measurements:

– 8 analog inputs

– Programmable full-scale range:

±312.5 mV to ±1.25 V

– Channel sequencer

• Monitoring and diagnostic features to mitigate and

detect random hardware faults

• Supply-voltage range: 2.9 V to 16 V

• SPI-compatible interface

• 9 GPIOs with PWM capability

2 Applications

• Automotive battery management systems (BMS):

– Current-shunt measurements

– Voltage measurements using external resistor

dividers

– Temperature measurements using thermistors

or analog output temperature sensors

3 Description

The ADS131B23-Q1 is a fully integrated, high-voltage

battery pack monitor for automotive electrical vehicle

(EV) battery management systems (BMS).

The ADS131B23-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.

An additional multiplexed, 16-bit ADC (ADC2A) is 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.

ADC2A 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 the development of functionally safe BMS.

Internal linear regulators with input ranges up to 16-V support powering the device with unregulated DC/DC

converters.

The ADS131B23-Q1 is offered in a 48-pin HTQFP package and is specified over the automotive temperature

range of –40°C to +105°C.