Analog Devices Inc. LTC6810 6-Channel Multi-Cell Battery Monitor

Analog Devices LTC6810 6-Channel Multi-Cell Battery Monitor 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. Multiple LTC6810-1 devices can be connected in series, permitting simultaneous cell monitoring of long, high-voltage battery strings. Each LTC6810 has an isoSPI™ interface for high-speed, RF-immune, long-distance communications. Using the LTC6810-1, multiple devices are connected in a daisy chain with one host processor connection for all of the devices. The LTC6810-1 supports bidirectional operation, allowing communication even with a broken wire. 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 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.

Features

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 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