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.