Overview

Features and Benefits

  • Pin-Compatible Upgrade from the LTC6804
  • Measures Up to 12 Battery Cells in Series
  • 1.2mV Maximum Total Measurement Error
  • Stackable Architecture Supports 100s of Cells
  • Built-in isoSPI 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 Delta-Sigma ADC with Programmable 3rd Order 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

Product Details

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

Multiple LTC6811 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each LTC6811 has an isoSPI interface for high speed, RF-immune, long distance communications. Using the LTC6811-1, multiple devices are connected in a daisy chain with one host processor connection for all devices. Using the LTC6811-2, multiple devices are connected in parallel to the host processor, with each device individually addressed.

The LTC6811 can be powered directly from the battery stack or from an isolated supply. The LTC6811 includes passive balancing for each cell, with individual PWM duty cycle control for each cell. Other features include an onboard 5V regulator, five general purpose I/O lines and a sleep mode, where current consumption is reduced to 6μA.

Applications

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

Tools & Simulations

Linduino

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits.

Linduino

Product Recommendations

LTC6811-1 Companion Parts

Recommended Related Parts

Recommended Suggested Temp Sensor

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

LTC6811-1 Discussions

ADuM3151 Peak power consumption
6 week(s) ago in Interface and Isolation
RE: Where to get the evaluation software for LTC6813?
20 week(s) ago in Power By Linear
RE: Active Cell balancing using LTC3300
22 week(s) ago in Power By Linear
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.