Features and Benefits
- Qualified for Automotive Applications
- Measures Up to 12 Li-Ion Cells in Series (60V Max)
- Stackable Architecture Enables >1000V Systems
- 0.25% Maximum Total Measurement Error
- 13ms to Measure All Cells in a System
- Cell Balancing:
- On-Chip Passive Cell Balancing Switches
- Provision for Off-Chip Passive Balancing
- Two Thermistor Inputs Plus On-Board Temperature Sensor
- 1MHz Daisy-Chainable Serial Interface
- High EMI Immunity
- Delta Sigma Converter with Built-In Noise Filter
- Open Wire Connection Fault Detection
- Low Power Modes
- 44-Lead SSOP Package
The LTC6802-1 is a complete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6802-1 can measure up to 12 series connected battery cells with an input common mode voltage up to 60V. In addition, multiple LTC6802-1 devices can be placed in series to monitor the voltage of each cell in a long battery string. The unique level-shifting serial interface allows the serial ports of these devices to be daisy-chained without optocouplers or isolators.
When multiple LTC6802-1 devices are connected in series they can operate simultaneously, permitting all cell voltages in the stack to be measured within 13ms.
To minimize power, the LTC6802-1 offers a measure mode, which simply monitors each cell for overvoltage and undervoltage conditions. A standby mode is also provided.
Each cell input has an associated MOSFET switch for discharging overcharged cells.
For large battery stack applications requiring individually addressable serial communications, see the LTC6802-2.
|LTC6802-1||Daisy Chain||Multiple devices can be connected in serial fashion without digital isolation|
|LTC6802-2||Addressable||Parallel addressed SPI interface - each device in a chain communicates with a control processor in parallel via external digital isolators|
- Electric and Hybrid Electric Vehicles
- High Power Portable Equipment
- Backup Battery Systems
- High Voltage Data Acquisition Systems
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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.
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