Analog Devices LTC6811-1

Description

The LTC®6811 is a multicell battery stack monitor thatmeasures up to 12 series connected battery cells witha total measurement error of less than 1.2mV. The cellmeasurement range of 0V to 5V makes the LTC6811suitable for most battery chemistries. All 12 cells can bemeasured in 290μs, and lower data acquisition rates canbe selected for high noise reduction.Multiple LTC6811 devices can be connected in series, permittingsimultaneous cell monitoring of long, high voltagebattery strings. Each LTC6811 has an isoSPI interface forhigh speed, RF-immune, long distance communications.Using the LTC6811-1, multiple devices are connected ina daisy chain with one host processor connection for alldevices. Using the LTC6811-2, multiple devices are connectedin parallel to the host processor, with each deviceindividually addressed.The LTC6811 can be powered directly from the batterystack or from an isolated supply. The LTC6811 includespassive balancing for each cell, with individual PWMduty cycle control for each cell. Other features include anonboard 5V regulator, five general purpose I/O lines and asleep mode, where current consumption is reduced to 4μA.

Features

nn Pin-Compatible Upgrade from the LTC6804nn Measures Up to 12 Battery Cells in Seriesnn 1.2mV Maximum Total Measurement Errornn Stackable Architecture Supports 100s of Cellsnn Built-in isoSPITM Interfacenn 1Mb Isolated Serial Communicationsnn Uses a Single Twisted Pair, up to 100 Metersnn Low EMI Susceptibility and Emissionsnn 290μs to Measure All Cells in a Systemnn Synchronized Voltage and Current Measurementnn 16-Bit Delta-Sigma ADC with Programmable 3rdOrder Noise Filternn Engineered for ISO 26262-Compliant Systemsnn Passive Cell Balancing with Programmable Timernn 5 General Purpose Digital I/O or Analog Inputsnn Temperature or other Sensor Inputsnn Configurable as an I2C or SPI masternn 4μA Sleep Mode Supply Currentnn 48-Lead SSOP Package

Typical applications

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

More information

• Datasheet
• IC product information