Data Sheet
ADBMS2950/ADBMS2951/ADBMS2952
Battery Pack Monitors
FEATURES
GENERAL DESCRIPTION
► 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
The ADBMS2950 and ADBMS2952 are battery pack monitors, and
the ADBMS2951 is a link monitor for electrical and hybrid vehicles,
and other current or voltage sense applications. The ADBMS2950
and ADBMS2952 measure 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 ADBMS2950 and ADBMS2952 also detect overcurrent condi-
tions using fast overcurrent ADCs with digital threshold compara-
tors and communicate their results through dedicated overcurrent
alert lines with minimum delay.
The ADBMS2950/ADBMS2951/ADBMS2952 feature 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 GPIOs also allow operation as an I2C
or SPI controller interface to address an external EEPROM or other
serial peripherals.
► On-demand operation
► Differential and single-ended mode
► Redundant implementation
► Overcurrent detection
► Triple redundancy with majority voting
► PWM output options
► Built-in isoSPI
► 2 Mbps isolated serial communications
► Capacitor or transformer coupled
► Daisy-chaining option
The built-in serial interface of the ADBMS2950 and ADBMS2951
can be configured for SPI or isolated isoSPI communication to the
host. An additional isoSPI port allows to connect a daisy-chain of
the ADBMS2950 and ADBMS2951 devices; optionally extended
with the ADBMS683x cell monitors. The ADBMS2952 supports SPI
communication only.
TYPICAL APPLICATION CIRCUIT
► 4-wire SPI option
► General-purpose digital IO
► Six general-purpose outputs
► Dual threshold read-back of GPOs
► Four GPIOs configurable as an I2C or SPI controller
► 48-Lead side-solderable QFN package
► AEC-Q100 qualified
► ADBMS295xWFS models developed for use in ISO 26262 appli-
cations for ASIL D
APPLICATIONS
► Electric and hybrid electric vehicles
► Backup battery systems
► Grid energy storage
Figure 1. Typical ADBMS2950 Application
I2C refers to a communications protocol originally developed by
Philips Semiconductors (now NXP Semiconductors).
Rev. SpB
Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to
change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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