Catalog
6 Channel Multicell Battery Monitor
Key Features
• Measures up to 6 battery cells in series
• Maximum lifetime total measurement error: 1.5 mV
• Stackable architecture supports hundreds of cells
• Built-in isoSPI interface2 Mbps isolated serial communicationsUses a single twisted pair, up to 20 metersLow EMI susceptibility and emissionsBidirectional for broken wire protectionCapacitor or transformer coupled
• 2 Mbps isolated serial communications
• Uses a single twisted pair, up to 20 meters
• Low EMI susceptibility and emissions
• Bidirectional for broken wire protection
• Capacitor or transformer coupled
• Hot plug tolerant without external protection
• Designed for high reliability systemsIncludes redundant cell measurementsDiagnostic coverage of operational modes
• Includes redundant cell measurements
• Diagnostic coverage of operational modes
• 304 μs to measure all cells in a system
• 16-bit ADC with programmable noise filter
• Passive cell balancing up to 300 mA per channel with programmable PWM
• 7 GPIO or analog inputsTemperature or other sensor inputsConfigurable as an I2C or SPI master
• Temperature or other sensor inputs
• Configurable as an I2C or SPI master
• Accommodates ±5 V busbar voltage
• Sleep state supply current: 5.5 μA
• 48-lead LQFP package with exposed pad
• AEC-Q100 qualified for automotive applications
Description
AI
The ADBMS6816 is a multicell battery stack monitor that measures up to six series connected battery cells with a lifetime total measurement error (TME) of less than 1.5 mV. The cell measurement range of 0 V to 5 V makes the ADBMS6816 suitable for most battery chemistries. All six cells can be measured in 304 μs, and lower data acquisition rates can be selected for high noise reduction.Multiple ADBMS6816 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each ADBMS6816 has an isoSPI™interface for high speed, RF immune, long distance communications.Multiple devices are connected in a daisy chain with one host processor connection for all devices. This daisy chain can be operated bidirectionally, ensuring communication integrity even in the event of a fault along the communication path.The ADBMS6816 can be powered directly from the battery stack or from an isolated supply. The ADBMS6816 includes passive balancing for each cell, with individual pulse-width modulation (PWM) duty cycle control for each cell. Other features include an on-board 5 V regulator, seven general-purpose input/output (GPIO) lines, and a sleep state, where current consumption is reduced to 5.5 μA.APPLICATIONSElectric and hybrid electric vehiclesBackup battery systemsGrid energy storageHigh power portable equipment