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GENERAL DESCRIPTION

The ADBMS6830B is a multicell battery stack monitor that measures

up to 16 series-connected battery cells with a lifetime total

measurement error (TME) of less than 2 mV over the full temperature

range. The measurement input range of ?2 V to +5.5 V makes

the ADBMS6830B suitable for most battery chemistries and allows

the measurement of voltages across bus bars. Provisions are

made for bypassing bus bars without dedicating any measurement

channels.

All cells can be measured simultaneously and redundantly with

two individual analog-to-digital converters (ADCs). The continuously

operating ADCs with a high sampling rate of 4.096 MHz allow

reduced external analog filtering and aliasing-free measurement

results. Higher noise reduction can be achieved by subsequent

programmable infinite impulse response (IIR) filters.

Multiple ADBMS6830Bs can be connected in series, permitting

simultaneous cell monitoring of long, high voltage battery strings.

Each ADBMS6830B has an isolated serial port interface (isoSPI?)

for high speed, RF immune, long distance communications. Multiple

devices are connected in a daisy chain with one host processor

connection. This daisy chain can be operated bidirectionally, ensuring

communication integrity even in the event of a fault along the

communication path.

The ADBMS6830B can be powered from the battery stack or an

isolated supply. The ADBMS6830B includes passive balancing with

individual pulse-width modulation (PWM) duty cycle control and up

to 300 mA discharge current for each cell. Other features include an

on-board 5 V regulator, up to 10 GPIOs, and a sleep mode, where

current consumption is reduced to 4 μA.

FEATURES

? Measures up to 16 battery cells in series

? Maximum lifetime TME: ±1.8 mV at 3.3 V per cell (–40°C to

+125°C)

? Simultaneous and continuous measurement of cell voltages

? Configurable integrated low-pass filtering

? Stackable architecture for high voltage battery packs

? Built-in isoSPI interface

? 2 Mbps isolated serial communications

? Uses a single twisted pair, up to 20 meters per segment

? Low EMI susceptibility and emissions

? Bidirectional for broken wire protection

? Capacitor or transformer-coupled

? Hot plug tolerant without external protection

? Passive cell balancing up to 300 mA per channel with programmable

PWM

? Up to 10 general-purpose analog inputs or digital I/O

? Temperature or other sensor inputs

? Configurable as an I2C or SPI master

? LPCM for cell and temperature monitoring in key-off state

? 4 μA sleep mode supply current

? Provisions for bus bars

APPLICATIONS

? Backup battery systems

? Grid energy storage

? Battery cell and pack management