LTC6810-2 Datasheet

• AEC-Q100 Qualified for Automotive Applications
• Measures Up to 6 Battery Cells in Series
• 1.8mV Maximum Total Measurement Error
• Stackable Architecture Supports 100s of Cells
• 290μs to Measure All Cells in a System
• Built-in isoSPI^™ Interface
  • 1Mb Isolated Serial Communications
  • Uses Single Twisted Pair, Up to 100 Meters
  • Low EMI Susceptibility and Emissions
  • Bidirectional for Broken Wire Protection
• Guaranteed Performance Down to 5V
• Performs Redundant Cell Measurements
• Engineered for ISO 26262 Compliant Systems
• Passive Cell Balancing with Programmable Pulse Width Modulation
• 4 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
• 44-Lead SSOP Package

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

The LTC6810 is a multicell battery stack monitor. The LTC6810 measures up to 6 series-connected battery cells with a total measurement error of less than 1.8mV. The cell measurement range of 0V to 5V makes the LTC6810 suitable for most battery chemistries. All 6 cells can be measured in 290μs, and lower data acquisition rates can be selected for high noise reduction.

Using the LTC6810-2, multiple devices are connected in parallel to the host processor, with each device individually addressed.

The LTC6810 can be powered directly from the battery stack or from an isolated supply. The LTC6810 includes passive balancing for each cell, with PWM duty cycle control for each cell and the ability to perform redundant cell measurements. Other features include an onboard 5V regulator, 4 general purpose I/O lines and a sleep mode in which current consumption is reduced to 4μA.