1 Features

? AEC-Q100 qualified for automotive applications

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

? Functional Safety-Compliant targeted

– Developed for functional safety applications

– Documentation to aid ISO 26262 system design

will be available upon production release

– Systematic capability up to ASIL D targeted

– Hardware capability up to ASIL D targeted

? Two simultaneous-sampling, 24-bit ADCs (ADC1A,

ADC1B) for current shunt measurement

– Programmable data rate: 500 SPS to 64 kSPS

– Programmable full-scale range: ±39 mV to

±312.5 mV

– Offset error (global-chop mode): 2 μV (max)

– Gain drift: 15 ppm/°C (max)

– Digital overcurrent comparator with

programmable thresholds and deglitch times

per ADC

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

ADC3B) for voltage measurement

– 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 measurement

– Eight input channels per ADC

– Programmable full-scale range: ±312.5 mV to

±1.25 V

– Channel autosequencer

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 complete analog front-end

(AFE) for automotive electrical vehicle (EV) battery

management systems (BMS) that 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 overcurrent detection comparators work in

parallel to the two ADCs for fast overcurrent detection.

Another set of two simultaneous-sampling, 24-bit

ADCs (ADC3A, ADC3B) is integrated to measure

battery pack voltage using external high-voltage

resistor dividers synchronously to the battery current

for accurate state-of-charge and state-of-health

battery calculations.

Additional two, multiplexed, 16-bit ADC channels

(ADC2A, ADC2B) are available to measure shunt

temperature using external temperature sensors, such

as thermistors or analog output temperature sensors,

as well as other voltages in the system.

A multitude of monitoring and diagnostic features are

integrated in the device to mitigate and detect random

hardware faults to aid in the development of functional

safe BMS.

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.