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