SBASA22A september 2022 – july 2023 ADS131B26-Q1
PRODUCTION DATA
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.