The LTC6812ILWE-1#3ZZPBF is a multicell battery stack monitor that measures up to 15 series connected battery cells with a total measurement error of less than 2.2mV. The cell measurement range of 0V to 5V makes the LTC6812ILWE-1#3ZZPBF suitable for most battery chemistries. All 15 cells can be measured in 245μs, and lower data acquisition rates can be selected for high noise reduction.
Multiple LTC6812ILWE-1#3ZZPBF devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each LTC6812ILWE-1#3ZZPBF has an isoSPI interface for high speed, RF immune, long distance communications. Multiple devices are connected in a daisy chain with one host processor connection for all devices. This daisy chain can be operated bidirectionally, ensuring communication integrity, even in the event of a fault along the communication path.
The LTC6812ILWE-1#3ZZPBF can be powered directly from the battery stack or from an isolated supply. The LTC6812ILWE-1#3ZZPBF includes passive balancing for each cell, with individual PWM duty cycle control for each cell. Other features include an onboard 5V regulator, nine general purpose I/O lines and a sleep mode, where current consumption is reduced to 6μA.
Feature
- Measures Up to 15 Battery Cells in Series
- 2.2mV Maximum Total Measurement Error
- Stackable Architecture for High Voltage Systems
- Built-In isoSPI™ Interface
- 1Mb Isolated Serial Communications
- Uses a Single Twisted Pair, Up to 100 Meters
- Low EMI Susceptibility and Emissions
- Bidirectional for Broken Wire Protection
- 245μs 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 Up to 200mA (Max) with Programmable Pulse-Width Modulation
- 9 General Purpose Digital I/O or Analog Inputs
- Temperature or Other Sensor Inputs
- Configurable as an I2C or SPI Master
- 6μA Sleep Mode Supply Current
- 64-Lead eLQFP Package
- AEC-Q100 Qualified for Automotive Applications
Applications
- Electric and Hybrid Electric Vehicles
- Backup Battery Systems
- Grid Energy Storage
- High Power Portable Equipment
