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LTC6802-1 - Multicell Battery Stack Monitor

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.

Features 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 Typical Application

Applications Electric and Hybrid Electric Vehicles High Power Portable Equipment Backup Battery Systems High Voltage Data Acquisition Systems Packaging

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