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LTC2991 Dataheets PDF



Part Number LTC2991
Manufacturers Linear
Logo Linear
Description Temperature Sensor and Dual Voltage Monitor
Datasheet LTC2991 DatasheetLTC2991 Datasheet (PDF)

LTC2991 Octal I2C Voltage, Current, and Temperature Monitor FEATURES n Measures Voltage, Current, Temperature n Measures Four Remote Diode Temperatures n 0.7°C (Typ) Accuracy, 0.06°C Resolution n 1°C (Typ) Internal Temperature Sensor n Series Resistance Cancellation n 14-Bit ADC Measures Voltage/Current n PWM Temperature Output n 3V to 5.5V Supply Operating Voltage n Eight Selectable Addresses n Internal 10ppm/°C Voltage Reference n V1 to V8 Inputs ESD Rated to 6kV HBM n 16-Lead MSO.

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LTC2991 Octal I2C Voltage, Current, and Temperature Monitor FEATURES n Measures Voltage, Current, Temperature n Measures Four Remote Diode Temperatures n 0.7°C (Typ) Accuracy, 0.06°C Resolution n 1°C (Typ) Internal Temperature Sensor n Series Resistance Cancellation n 14-Bit ADC Measures Voltage/Current n PWM Temperature Output n 3V to 5.5V Supply Operating Voltage n Eight Selectable Addresses n Internal 10ppm/°C Voltage Reference n V1 to V8 Inputs ESD Rated to 6kV HBM n 16-Lead MSOP Package APPLICATIONS n Temperature Measurement n Supply Voltage Monitoring n Current Measurement n Remote Data Acquisition n Environmental Monitoring DESCRIPTION The LTC®2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors. Additional measurements include internal temperature and internal VCC. The internal 10ppm reference minimizes the number of supporting components and area required. Selectable address and configurable functionality give the LTC2991 flexibility to be incorporated in various systems needing temperature, voltage or current data. The LTC2991 fits well in systems needing submillivolt voltage resolution, 1% current measurement and 1°C temperature accuracy or any combination of the three. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Easy Drive is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 5V 3.3V 2.5V 1.2V RSENSE 3.3V I/O 2.5V I/O 1.2V CORE I2C 2-WIRE INTERFACE TAMBIENT VCC V1 V2 V3 V4 SDA SCL ADR0 ADR1 ADR2 LTC2991 V5 V6 V7 GND V8 PWM 2991 TA01a FPGA FPGA TEMPERATURE BOARD TEMPERATURE TO FAN TERROR (°C) Temperature Total Unadjusted Error 1.00 0.75 0.50 0.25 TREMOTE 0 –0.25 TINTERNAL –0.50 –0.75 –1.00 –50 –25 0 25 50 75 TAMBIENT (°C) 100 125 150 2991 TA01b For more information www.linear.com/LTC2991 2991ff 1 LTC2991 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage (VCC)................................. –0.3V to 6.0V Input Voltages V1, V2, V3, V4, V5, V6, V7, V8, SCL, ADR0, ADR1, ADR2...............–0.3V to (VCC + 0.3V) Output Voltage PWM.....................–0.3V to (VCC + 0.3V) Output Voltage SDA...................................... –0.3V to 6V Operating Temperature Range LTC2991C................................................. 0°C to 70°C LTC2991I..............................................–40°C to 85°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) MS Package........................................................... 300°C PIN CONFIGURATION TOP VIEW V1 1 V2 2 V3 3 V4 4 V5 5 V6 6 V7 7 V8 8 16 15 AVCDCR2 14 ADR1 13 ADR0 12 PWM 11 SCL 10 SDA 9 GND MS PACKAGE 16-LEAD PLASTIC MSOP TJMAX = 125°C, θJA = 120°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2991CMS#PBF LTC2991CMS#TRPBF 2991 16-Lead Plastic MSOP 0°C to 70°C LTC2991IMS#PBF LTC2991IMS#TRPBF 2991 16-Lead Plastic MSOP –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VCC = 3.3V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX General VCC Input Supply Range ICC Input Supply Current ISD Input Supply Current VCC(UVL) Input Supply Undervoltage Lockout Measurement Accuracy l 2.9 5.5 During Conversion, I2C Inactive l 1.1 1.5 Shutdown Mode, I2C Inactive l 16 l 1.3 2.0 2.6 TINTERNAL(TUE) TRMT(TUE) Internal Temperature Total Unadjusted Error Remote Diode Temperature Total Unadjusted Error η = 1.004 ±1 ±3.5 l ±0.7 ±1.5 VCC(TUE) VCC Voltage Total Unadjusted Error 2.9V ≤ 5.5V l ±0.05 ±0.25 VN(TUE) VDIFF(TUE) V1 Through V8 Total Unadjusted Error Differential Voltage Total Unadjusted Error V1 – V2, V3 – V4, V5 – V6, V7 – V8 0V ≤ 4.9V –300mV≤ VD ≤300mV l ±0.05 ±0.25 l ±0.1 ±0.75 VDIFF(MAX) VOFFSET_DIFF VOFFSET_SE Full-Scale Differential Voltage Differential Offset Single-Ended Offset V1 through V8 = 0V V1 through V8 = 0V l –312.5 312.5 l –12.5 0 12.5 l –6 0 6 UNITS V mA µA V °C °C % % % mV LSB LSB 2991ff 2 For more information www.linear.


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