Multi-cell battery stack monitor

Mar 19 2023 2023-03 Power Analog Devices

The LTC6811 is a multi-cell stack monitor that measures up to 12 cells connected in series with a total measurement error of less than 1.2mV. The 0V to 5V battery measurement range makes the LTC6811 suitable for most battery chemicals. The LTC6811 includes passive balancing for each unit, each with a separate PWM duty ratio control. Additional features include onboard 5V regulators, five universal I/O cables and a sleep mode where current consumption is reduced to 4µa.

The LTC6811 is a multi-cell stack monitor that measures up to 12 cells connected in series with a total measurement error of less than 1.2mV. The 0V to 5V battery measurement range makes the LTC6811 suitable for most battery chemicals. All 12 units can be measured in 290µs, and low data acquisition rates can be selected for high noise reduction.

Multiple LTC6811 devices can be connected in series, allowing simultaneous monitoring of long, high-voltage battery packs. Each LTC6811 has an isoSPI interface for high speed, rf immunity, and telecommunication. With LTC6811-1, multiple devices are connected in a Daisy chain, all with a host processor attached. With LTC6811-2, multiple devices are connected to the host processor in parallel, each addressed separately.

The LTC6811 can be powered directly from the battery pack or from an isolated power supply. The LTC6811 includes passive balancing for each unit, each with a separate PWM duty ratio control. Additional features include onboard 5V regulators, five universal I/O cables and a sleep mode where current consumption is reduced to 4µa.

Features

● Pin-Compatible Upgrade from the LTC6804
● Measures Up to 12 Battery Cells in Series
● 1.2mV Maximum Total Measurement Error
● Stackable Architecture for High Voltage Systems
● Built-in isoSPITM Interface
● 1Mb Isolated Serial Communications
● Uses a Single Twisted Pair, up to 100 Meters
● Low EMI Susceptibility and Emissions
● 290µs to Measure All Cells in a System
● Synchronized Voltage and Current Measurement
● 16-Bit ADC with Programmable Noise Filter
● Engineered for ISO 26262-Compliant Systems
● Passive Cell Balancing with Programmable Timer
● 5 General Purpose Digital I/O or Analog Inputs
● Temperature or other Sensor Inputs
● Configurable as an I2C or SPI master
● 4μA Sleep Mode Supply Current
● 48-Lead SSOP Package
● AEC-Q100 Qualified for Automotive Applications

Applications

● Electric and Hybrid Electric Vehicles
● Backup Battery Systems
● Grid Energy Storage
● High Power Portable Equipment

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