Battery Pack Monitor

The ADBMS2950B is a battery pack monitor for current or voltage sense applications. It measures the current flowing in and out of a battery pack by sensing the voltage drop over a shunt resistor with a very low offset.

The ADBMS2950B also detects overcurrent conditions using fast overcurrent analog-to-digital converters (ADCs) with digital threshold comparators and communicate their results through dedicated overcurrent alert lines with minimum delay. It features a total of 12 internally buffered high impedance inputs for measuring voltages from external sensors or resistor-dividers, enabling measurement of pack voltages, temperatures, HV-Link voltages, chassis isolation, and the supervision of the state of contactors and fuses.

Six digital outputs (GPOs) supporting open-drain or push-pull can be used to control high voltage transistors to disconnect external resistor-dividers. Four digital general-purpose inputs/outputs (GPIOs) also allow operation as an I2C or SPI controller interface to address an external electronically erasable programmable read‐only memory (EEPROM) or other serial peripherals.

The built-in serial interface of the ADBMS2950B can be configured for SPI or isolated isoSPI communication to the host. An additional isoSPI port allows to connect a daisy-chain of the ADBMS2950B devices, which is optionally extended with the ADBMS6830B cell monitor.

Applications

* Backup battery systems

* Grid energy storage

* Battery pack current measurement

* Buffered analog inputs

* Continuous operation option

* Lossless measurement for coulomb counting

* 1 ms update rate

* ±0.1% maximum gain error

* ±1 µV maximum offset

* Redundant implementation

* Battery pack voltage measurement

* Buffered analog inputs

* Synchronous with current measurement

* Differential and single-ended mode

* Redundant implementation

* 10 additional voltage measurement channels

* Buffered analog inputs

* On-demand operation

* Differential and single-ended mode

* Redundant implementation

* Overcurrent detection

* Triple redundancy with majority voting

* PWM output options

* Built-in isoSPI™ interface

* 2 Mbps isolated serial communications

* Capacitor or transformer coupled

* Daisy-chaining option

* 4-wire SPI option

* General-purpose digital IO

* Six general-purpose outputs (GPOs)

* Dual threshold read-back of GPOs

* Four GPIOs configurable as an I2C or SPI controller

* 48-Lead side-solderable QFN package