Data Sheet

ADBMS2950/ADBMS2951/ADBMS2952

Battery Pack Monitors

Rev. SpA

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FEATURES

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Battery pack current measurement

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Buffered analog inputs

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Continuous operation option

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Lossless measurement for coulomb counting

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1 ms update rate

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±0.1% maximum gain error

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±1 µV maximum offset

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Redundant implementation

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Battery pack voltage measurement

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Buffered analog inputs

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Synchronous with current measurement

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Differential and single-ended mode

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Redundant implementation

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10 additional voltage measurement channels

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Buffered analog inputs

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On-demand operation

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Differential and single-ended mode

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Redundant implementation

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Overcurrent detection

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Triple redundancy with majority voting

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PWM output options

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Built-in isoSPI

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2 Mbps isolated serial communications

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Capacitor or transformer coupled

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Daisy-chaining option

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4-wire SPI option

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General-purpose digital IO

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Six general-purpose outputs

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Dual threshold read-back of GPOs

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Four GPIOs configurable as an I2C or SPI controller

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48-Lead side-solderable QFN package

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AEC-Q100 qualified

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ADBMS295xWFS models developed for use in ISO 26262 appli-

cations for ASIL D

APPLICATIONS

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Electric and hybrid electric vehicles

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Backup battery systems

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Grid energy storage

I2C refers to a communications protocol originally developed by

Philips Semiconductors (now NXP Semiconductors).

GENERAL DESCRIPTION

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.

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.

For more information about the ADBMS2950/ADBMS2951/

ADBMS2952, contact BMS_Doc_Request@analog.com.

TYPICAL APPLICATION CIRCUIT

Figure 1. Typical ADBMS2950 Application