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LTC6801 Datasheet(PDF) 1 Page - Analog Devices |
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LTC6801 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 28 page  LTC6801 1 Rev. F For more information www.analog.com APPLICATIONS n Redundant Battery Monitor n Hybrid Electric Vehicles n Battery Backup Systems n Power Systems Using Multiple Battery Cells n Qualified for Automotive Applications n Monitors Up to 12 Li-Ion Cells in Series (60V Max) n Stackable Architecture Enables >1000V Systems n 1% Maximum Overvoltage Detection Level Error n Adjustable Overvoltage and Undervoltage Detection n Self Test Features Guarantee Accuracy n Robust Fault Detection Using Differential Signals n Simple Pin-Strapped Configuration Allows Battery Monitoring without a Microcontroller n 15.5ms to Monitor All Cells in a System n Programmable Response Time n Two Temperature Monitor Inputs n Low Power Idle Mode n 36-Lead SSOP Package –40 20 95 –10 50 110 125 5 80 –25 35 65 TEMPERATURE (°C) 1.0 –0.8 0.8 0.4 0 –0.4 0.6 0.2 –0.2 –0.6 –1.0 6801 TA01b V+ = 43.2V OV = 4.116V 5 TYPICAL UNITS BLOCK DIAGRAM DESCRIPTION Independent Multicell Battery Stack Fault Monitor The LTC®6801 is a multicell battery monitoring IC incor- porating a 12-bit ADC, a precision voltage reference, sam- pled comparator, and a high voltage input multiplexer. The LTC6801 can monitor as many as 12 series connected battery cells for overvoltage, undervoltage, and over- temperature conditions, indicating whether the cells are within specified parameters. The LTC6801 generates a clock output when no fault conditions exist. Differential clocking provides high noise immunity and ensures that battery stack fault conditions cannot be hidden by frozen bits or short circuit conditions. Each LTC6801 can operate with a battery stack voltage up to 60V and multiple LTC6801 devices can be stacked to monitor each individual cell in a long battery string. When multiple devices are stacked, the status signal of each LTC6801 can be daisy-chained, without opto-couplers or isolators, providing a single status output for the entire battery string. The LTC6801 is configurable by external pin strapping. Adjustable overvoltage and undervoltage thresholds sup- port various Li-Ion chemistries. Selectable measurement times allow users to save power. FEATURES 6801 TA01a 1 2 3 12 13 20 22 14 15 16 VREF VTEMP1 VTEMP2 NTC NTC C1 C2 C11 C12 V+ V– NEXT LOWER CELL PACK NEXT HIGHER CELL PACK 12 MUX “CELLS GOOD” ENABLE INPUT ISOLATION CLOCK SIGNAL INPUT ENABLES THE LTC6801 CLOCK SIGNAL OUTPUT INDICATES SYSTEM “OK” STATUS OUTPUT CONTROL LOGIC 17 REFERENCE LTC6801 ADC 0V Detection Level Error All registered trademarks and trademarks are the property of their respective owners. Document Feedback |
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