Analog Devices ADBMS6948 Product Info

The ADBMS6948 is a multi-cell battery monitor with the industry's first parallel measurement architecture, which measures up to 16 series-connected battery cells with a TME of less than 3 mV over the full temperature range and lifetime. The parallel measurement architecture ensures the lowest external component cost in its category. It is the industry's only battery management system with redundancy on voltage, current, temperature, and overcurrent detection. The cell voltage measurement input range of -2.0 V to 5.5 V makes ADBMS6948 suitable for most battery chemistries and allows the measurement of voltages across bus bars. All 16-cells can be measured simultaneously and redundantly with two individual analog-to-digital converters (ADCs), C-ADC and S-ADC, respectively. The ADCs have a sampling rate of 4.096 MHz and a conversion time of up to 1 ms. Higher noise reduction can be achieved by subsequent programmable digital IIR filters.

The ADBMS6948 also provides the best-in-class integrated bidirectional current measurement capability. It measures the current flowing in and out of the battery module by measuring the voltage drop over an external sense resistor with an input offset voltage of 1 µV and 0.1% gain error over a lifetime. The additional current channel ADC can be synchronized with the cell voltage measurements. This combination of parallel, synchronous, and precise voltage and current measurement provides the ability to achieve an accurate state of charge (SOC), state of power (SOP), and state of health (SOH) estimation at the microcontroller unit (MCU). The ADBMS6948 also provides an integrated coulomb counter, which can be used to offload MCU overheads for precise SOC estimation.

The ADBMS6948 also provides the only Li-ion cell monitor with an integrated overcurrent (OC) detection feature with a less than 2µs overcurrent response time. The dedicated overcurrent pins can be used to connect to