Analog Devices ADBMS2950B Product Info

• 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

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