LTC2991 Octal I2C Voltage, Current, and Temperature Monitor FEATURESDESCRIPTION n Measures Voltage, Current, Temperature The LTC®2991 is used to monitor system temperatures, n Measures Four Remote Diode Temperatures voltages and currents. Through the I2C serial interface, the n 0.7°C (Typ) Accuracy, 0.06°C Resolution eight monitors can individually measure supply voltages n 1°C (Typ) Internal Temperature Sensor and can be paired for differential measurements of cur- n Series Resistance Cancellation rent sense resistors or temperature sensing transistors. n 14-Bit ADC Measures Voltage/Current Additional measurements include internal temperature n PWM Temperature Output and internal VCC. The internal 10ppm reference minimizes n 3V to 5.5V Supply Operating Voltage the number of supporting components and area required. n Eight Selectable Addresses Selectable address and configurable functionality give the n Internal 10ppm/°C Voltage Reference LTC2991 flexibility to be incorporated in various systems n V1 to V8 Inputs ESD Rated to 6kV HBM needing temperature, voltage or current data. The LTC2991 n 16-Lead MSOP Package fits well in systems needing submillivolt voltage resolution, 1% current measurement and 1°C temperature accuracy or any combination of the three. APPLICATIONS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Easy Drive n Temperature Measurement is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Supply Voltage Monitoring n Current Measurement n Remote Data Acquisition n Environmental Monitoring TYPICAL APPLICATION 5V Temperature Total Unadjusted Error 3.3V 3.3V I/O 1.00 2.5V 2.5V I/O 0.75 RSENSE 1.2V 1.2V CORE 0.50 TREMOTE 0.25 FPGA V (°C) CC V1 V2 V3 V4 0 SDA V5 T ERROR TINTERNAL –0.25 SCL 2-WIRE LTC2991 FPGA –0.50 I2C INTERFACE ADR0 V6 TEMPERATURE –0.75 ADR1 ADR2 –1.00–50 –25 0 25 50 75 100 125 150 V7 BOARD T TEMPERATURE AMBIENT (°C) TAMBIENT 2991 TA01b V8 PWM TO FAN GND 2991 TA01a 2991ff For more information www.linear.com/LTC2991 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Timing Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
