LTC6802-2 Datasheet | Linear Technology

Features nn Qualified for Automotive Applications nn Measures Up to 12 Li-Ion Cells in Series (60V Max) nn Stackable Architecture Enables Monitoring High Voltage Battery Stacks nn Individually Addressable with 4-Bit Address nn 0.25% Maximum Total Measurement Error nn 13ms to Measure All Cells in a System nn Cell Balancing: nn On-Chip Passive Cell Balancing Switches nn Provision for Off-Chip Passive Balancing nn Two Thermistor Inputs Plus Onboard Temperature Sensor nn 1MHz Serial Interface with Packet Error Checking nn High EMI Immunity nn Delta-Sigma Converter with Built-In Noise Filter nn Open-Wire Connection Fault Detection nn Low Power Modes nn 44-Lead SSOP Package APPLICATIONS nn Electric and Hybrid Electric Vehicles nn High Power Portable Equipment nn Backup Battery Systems nn High Voltage Data Acquisition Systems LTC6802-2 Multicell Addressable Battery Stack Monitor DESCRIPTION The LTC®6802-2 is a plete battery monitoring IC that includes a 12-bit ADC, a precision voltage reference, a high voltage input multiplexer and a serial interface. Each LTC6802-2 can measure 12 series connected battery cells, with a total input voltage up to 60V. The voltage on all 12 input channels can be measured within 13ms. Many LTC6802-2 devices can be stacked to measure the voltage of each cell in a long battery string. Each LTC6802-2 has an individually addressable serial interface, allowing up to 16 LTC6802-2 devices to interface to one control processor and operate simultaneously. To minimize power, the LTC6802-2 offers a measure mode to monitor each cell for overvoltage and undervoltage conditions. A standby mode is also provided to reduce supply current to 50µA. Each cell input has an associated MOSFET switch that can discharge any overcharged cell. The related LTC6802-1 offers a serial interface that allows the serial ports of multiple LTC6802-1 devices to be daisy chained without opto-couplers or isolators. All registered trademarks and trademarks are the property of...