1 Features

? 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: 25 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

? Battery energy storage systems (ESS):

– Current-shunt measurements

– Voltage measurements using external resistor

dividers

– Temperature measurements using thermistors

or analog output temperature sensors

3 Description

The ADS131B23 is a complete analog front-end

(AFE) for industrial battery management systems

(BMS). The device integrates two simultaneoussampling,

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 functional safe

BMS.

Internal linear regulators with input ranges up to 16 V

support powering the device with unregulated DC/DCconverters.

The ADS131B23 is offered in a 48-pin HTQFP

package and is specified over the industrial

temperature range of –40°C to +105°C.