The LTC6810 is a multicell battery stack monitor. TheLTC6810 measures up to 6 series-connected battery cellswith a total measurement error of less than 1.8mV. Thecell measurement range of 0V to 5V makes the LTC6810suitable for most battery chemistries. All 6 cells can bemeasured in 290μs, and lower data acquisition rates canbe selected for high noise reduction.
Multiple LTC6810-1 devices can be connected in series,permitting simultaneous cell monitoring of long, highvoltage battery strings. Each LTC6810 has an isoSPIinterface for high speed, RF-immune, long distance communications.Using the LTC6810-1, multiple devices areconnected in a daisy chain with one host processor connectionfor all devices. The LTC6810-1 supports bidirectionaloperation, allowing communication even witha broken wire. Using the LTC6810-2, multiple devicesare connected in parallel to the host processor, with eachdevice individually addressed.
The LTC6810 can be powered directly from the batterystack or from an isolated supply. The LTC6810 includespassive balancing for each cell, with PWM duty cyclecontrol for each cell and the ability to perform redundantcell measurements. Other features include an onboard 5Vregulator, 4 general purpose I/O lines and a sleep mode inwhich current consumption is reduced to 4μA.
Feature
- Measures Up to 6 Battery Cells in Series
- 1.8mV Maximum Total Measurement Error
- Stackable Architecture Supports 100s of Cells
- Built-in isoSPI™ Interface
- 290μs to Measure All Cells in a System
- 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 PulseWidth 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
Applications
- Electric and Hybrid Electric Vehicles
- Backup Battery Systems
- Grid Energy Storage
- High Power Portable Equipment
