Features and Benefits
- 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
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.
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 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 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.
- Electric and Hybrid Electric Vehicles
- Backup Battery Systems
- Grid Energy Storage
- High Power Portable Equipment
Product Lifecycle 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)
Demonstration circuit DC2792A is an SPI serial to dual-port isoSPI adapter that uses a pair of multiplexed LTC6820 isoSPI transceivers. The board can replace a DC1941 in cases where isoSPI battery-management (BMS) devices are being evaluated, but provides a second isoSPI master to exercise the reversible isoSPI feature where available. The SPI interface can be provided via the legacy 14-contact ribbon cable from either a DC590 or DC2026 USB adapter, or directly installed on the DC2026 as a Linduino ‘shield’. The two isoSPI ports are MAIN and AUXiliary, with activity of each indicated by blue LEDs. For use in place of DC1941, the MAIN port must be used. Power for the DC2792A comes indirectly from the USB port of the host computer, via the USB to serial adapter being used.
Demonstration circuit 2515A includes the LTC6810-1, a 6 channel battery-stack monitor. Multiple DC2515A boards can be linked through a 2-wire isolated serial interface (isoSPI) to monitor a long series of cells in a stack.
The DC2515 can communicate to a PC by connecting directly to a DC2026 Linduino® One. The DC2026 must be loaded with the appropriate program (called a “sketch”) to control the battery stack monitor IC and receive data through a USB serial port. The DC2026C provides a standard SPI interface which can be connected directly to a DC2515 board (J4 Connector). Or, the SPI can be translated to isoSPI and then connected to a DC2515 isoSPI port (J2/J1 connector). The DC1941 provides a single SPI-isoSPI channel, and the DC2792 provides two SPIisoSPI channels for reversible operation.
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Sample & Buy
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