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Numéro de sérieLTC6802-1
CategoriePower Management => Battery Management
DescriptionMulticell 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. Using a unique level-shifting serial interface, multiple LTC6802-1 devices can be connected in series, without optocouplers or isolators, allowing for monitoring of every cell in a long string of series-connected batteries.
SociétéLinear Technology Corporation
DatasheetTélécharger LTC6802-1 datasheet
 
 
  • Description courte

  • DESCRIPTION

    The 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 to 12 series connected battery cells with an input common mode voltage to 60V. Using a unique level-shifting serial interface, multiple LTC6802-1 devices can be connected in series, without optocouplers or isolators, allowing for monitoring of every cell in a long string of series-connected batteries. 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 to monitor 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. The related LTC6802-2 offers an individually addressable serial interface.

    L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

    Measures 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 Serial Interface with Packet Error Checking High EMI Immunity Delta Sigma Converter With Built In Noise Filter Open Wire Connection Fault Detection Low Power Modes 44-Lead SSOP Package

    APPLICATIONS

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

    NEXT 12-CELL PACK ABOVE V+ LTC6802-1 SERIAL DATA TO LTC6802-1 ABOVE DIE TEMP

    TOP VIEW CSBO SDOI SCKO S11 C10 CSBI 43 SDO 42 SDI 41 SCKI 40 VMODE GPIO1 37 WDTB 36 MMB 25 TOS 34 VREG 33 VREF 23 C3

    Total Supply Voltage (V+ to V­).................................60V Input Voltage (Relative to V­) 0.7V Sn pins............................... + 9V CSBO, SCKO, SDOI..................V+ + 0.7V All other pins........................................... to 7V Voltage Between Inputs to 9V Input Current All Pins............................................................±10mA Operating Temperature Range.................. to 85°C Specified Temperature Range.................. to 85°C Junction Temperature........................................... 150°C Storage Temperature Range................... to 11

    LEAD FREE FINISH LTC6802IG-1#PBF TAPE AND REEL LTC6802IG-1#TRPBF PART MARKING LTC6802IG-1 PACKAGE DESCRIPTION 44-Lead Plastic SSOP TEMPERATURE RANGE to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

    SYMBOL PARAMETER DC Specifications VACC Measurement Resolution ADC Offset Voltage ADC Gain Error VERR Total Measurement Error Quantization of the ADC (Note 2) (Note 2) (Note 4) VCELL = 0V VCELL = 2.3V VCELL = 2.3V VCELL = 3.6V VCELL = 3.6V VCELL = 4.2V VCELL = 4.2V VCELL = 4.6V VTEMP = 2.3V VTEMP = 3.6V VTEMP = 4.2V Full Scale Voltage Range of Inputs C4 thru C11 Range of Input C3 Range of Inputs C1, C2 Programmed for 4.2V Programmed for 2.3V Error in Measurement at 125°C RLOAD to V­

    The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 0V, unless otherwise noted.

    Cell Voltage Range Common Mode Voltage Range Measured Relative to V­ Overvoltage (OV) Detection Level Undervoltage (UV) Detection Level Die Temperature Measurement Error

    Reference Pin Voltage Reference Voltage Temperature Coefficient Reference Voltage Thermal Hysteresis Reference Voltage Long Term Drift

    to 85°C and 50, No Load ILOAD = 4mA VERR Specifications Met Timing Specifications Met In/Out of Pins C1 Thru C12 When Measuring Cells When Not Measuring Cells Current Into the V+ Pin when Measuring Voltages with the ADC Average Current Into the V+ Pin While Monitoring for UV and OV Conditions Continuous Monitoring Monitor Every 130ms Monitor Every 500ms Monitor Every 2s Current into the V+ Pin When Idle All Serial Port Pins at Logic `1' Current into the V+ Pin During Serial Communications. All Serial Port Pins at Logic `0' VMODE = 0, This Current is Added IS or IQS

    Regulator Pin Voltage Regulator Pin Short Circuit Current Limit
    Supply Voltage, V+ Relative to V­ Input Bias Current
    Supply Current, Active Supply Current, Monitor Mode
    Supply Current, Idle Supply Current, Serial I/O