ADBMS6834

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Multicell Battery Monitors

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製品情報

Simultaneous and continuous measurement of cell voltages

24 channel (ADBMS6834)
18 channel (ADBMS6836)
16 channel (ADBMS6837)

Passive cell balancing with programmable pulse-width modulation control per channel
Configurable digital low-pass filters per channel
Bidirectional isoSPI interface
2 Mbps isolated serial communication
Uses a single twisted pair cable
Low EMI susceptibility and emissions
Capacitive or transformer-coupled
Integrated step-down DC/DC regulator with internal low-resistance power MOSFET
Low-power cell monitoring mode

Bus bar bypass and measurement support
14 pins configurable as analog input or digital I/O
Configurable as an I²C or SPI port
2 additional pins dedicated as analog inputs
72/88-lead side-solderable package with exposed pad
Maximum lifetime TME < 3 mV (over full temperature and voltage range)
Sleep-state supply current of 7 μA
Measure-state power reduction of up to 1W
72/88-lead side-solderable package with exposed pad
AEC-Q100 Qualified
ISO 26262 life cycle, automotive safety integrity level capability (ASIL D)

The ADBMS6834/ADBMS6836/ADBMS6837 (ADBMS Cell Monitor) is a family of multicell battery monitors that measure 16, 18, or 24 series-connected battery cells.

All cell voltages are measured simultaneously using a set of analog-to-digital converters (ADCs), one for each cell. Each channel includes a programmable digital low-pass filter. A second set of similar ADCs provides closely correlated measurements to ensure redundant measurement capability required to meet safety standards. The ADBMS Cell Monitor allows bus bars to be bypassed using dedicated pins. Direct measurement of negative bus bar voltages are supported when across each channel.

The device has a bidirectional isolated serial-port interface (isoSPI) for high-speed, RF-immune communication over simple twisted pair cables. Using the isoSPI interface, multiple ADBMS Cell Monitors may be connected in a daisy-chain configuration to a BMS Controller enabling simultaneous monitoring of long, high-voltage strings of battery cells. Using the bidirectional feature, the daisy-chain may also be configured to provide communication redundancy to protect against a cable break along the chain.

The device supports internal and external passive cell balancing with individually programmable pulse-width modulation (PWM) control. The ADBMS Cell Monitor is powered directly from the battery to be measured, by either the step-down DC/DC or linear regulator. Using the integrated DC/DC regulator significantly reduces the power consumption by up to 1W while in the MEASURE state. When in SLEEP state, the device draws 7 μA, which minimizes the discharge of the battery stack. The lifetime total measurement error (TME) of the device is less than 3 mV over the full-operating temperature and voltage range.

Applications