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

? Two simultaneous-sampling, 24-bit ADCs (ADC3A,

ADC3B) for voltage measurements:

– Programmable data rate: 500 SPS to 64 kSPS

– Programmable full-scale range:

±312.5 mV to ±1.25 V

? Two multiplexed, 16-bit ADCs (ADC2A, ADC2B)

for voltage and temperature measurements:

– 8 analog inputs per ADC

– 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 ADS131B26-Q1 is a fully integrated, high-voltage

battery pack monitor for automotive electrical vehicle

(EV) battery management systems (BMS).

The ADS131B26-Q1 integrates two simultaneous-sampling, high-precision, 24-bit analog-to-digital converter

(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.

Another set of two simultaneous-sampling, 24-bit ADCs (ADC3A, ADC3B) are integrated to measure battery

pack voltage using external high-voltage resistor dividers synchronously to the battery current for accurate

battery state-of-charge and state-of-health calculations.

Additionally, 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 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 ADS131B26-Q1 is offered in a 48-pin HTQFP package and is specified over the automotive temperature

range of –40°C to +105°C.