Automotive high-voltage battery-pack monitor with four ADC channels for current and voltage sensing

The ADS131B24-Q1 is a fully integrated, high-voltage battery pack monitor for

automotive electrical vehicle (EV) battery management systems (BMS).

The ADS131B24-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.

Additional 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 16V support powering the device with unregulated DC/DC converters.

The ADS131B24-Q1 is offered in a 48-pin HTQFP package and is specified over

the automotive temperature range of –40°C to +105°C.