Multi-Sensor High Accuracy Digital Temperature Measurement Systems Thermocouple Digitized Temperature Measurement (°C or °F) RTD Thermistor Diode Any Temperature Sensor In. Benchtop Accuracy Out. The LTC®2983 and LTC2984 are high accuracy digital temperature measurement systems that integrate all of the necessary components to excite, calibrate, measure and digitize diodes, thermistors, thermocouples and RTDs (resistance temperature detectors). Any combination of sensors connect directly to the LTC2983/LTC2984, with no other active components required. An SPI interface provides readout of temperature in °C or °F and simple configuration of features such as automatic cold junction compensation, linearization coefficients and fault detection. The LTC2984 includes EEPROM for storing channel configuration data and custom coefficients. Error Contribution Features n n n n n n n n n n n Directly Digitizes 2-, 3-, 4-Wire RTDs, Thermocouples, Thermistors and Diodes On-Chip EEPROM Stores Channel Configuration Data and Custom Coefficients (LTC2984) 3V to 5V Supply Range 20 Flexible Inputs Allow Interchanging Sensors without Hardware Modifications Measures Negative Voltages and Ground-Referenced Sensors without the Need of an Extra Supply or Level Shift Circuitry Buffered Inputs Allow External Protection and Filtering without Droop Errors Includes 15ppm/°C (max) Reference, Switching Networks, Current Sources, Three 24-Bit ∆∑ADCs, RAM, ROM, and Sensor Linearization Circuitry Built-In Standard or Programmable Coefficients Simultaneous 50Hz/60Hz Rejection Sleep Mode to Reduce Current Consumption to 25μA Automatic Burn Out, Short-Circuit and Fault Detection 48-Lead 7mm × 7mm LQFP Package 0.5 0.4 0.3 THERMISTOR 0.2 ERROR (°C) n THERMOCOUPLE 0.1 0 –0.1 –0.2 –0.3 3904 DIODE RTD –0.4 –0.5 –200 0 L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks and Linduino and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 200 400 600 800 1000 1200 1400 TEMPERATURE (°C) Sensor Specific Features Thermocouples RTDs SHARED RSENSE SINGLE-ENDED THERMOCOUPLE 4-WIRE RTD SHARED COLD JUNCTION SENSOR DIFFERENTIAL THERMOCOUPLE n n n n 3-WIRE RTD Single-Ended or Differential Measurements Built-In Linearization NIST Coefficients for Types J, K, E, N, R, S, T and B Programmable Custom Coefficients Support Automatic Cold Junction Compensation (CJC) Using Shareable Diode, RTD or Thermistor n n n n Thermistors n SHARED RSENSE n n n STANDARD THERMISTOR CUSTOM THERMISTOR n n n n n n n n Single-Ended or Differential Measurements Shareable Sense Resistor for Multiple Thermistors or RTDs Automatic Rotation of Thermistor for Removal of Thermocouple Effects Built-In Linearization Coefficients for Types 44004/44033, 44005/44030, 44006/44031, 44007/44034, 44008/44032, and YSI-400 Programmable Custom Steinhart-Hart or Custom Coefficients Support Auto Range Current Sources for High Accuracy Thermistor Resistance Can Be Orders of Magnitude Larger Than Sense Resistor Hi-Z Sensor and Sense Resistor Input 2-Wire Support for Simple Setups 3-Wire Support for Balanced Lead Resistance Error Cancellation 4-Wire Support for Unbalanced Lead Resistance Error Cancellation; Automatic Rotation of RTD for Removal of Thermocouple Effects Shareable Sense Resistor for Multiple RTDs or Thermistors Built-In Linearization Coefficients for Types PT-10, PT-50, PT-100, PT-200, PT-500, PT-1000 and NI-120 with Selectable Common Standards (385, 392, etc.) Programmable Custom Coefficients Support Programmable Excitation Current: 5μA - 1mA Hi-Z Sensor and Sense Resistor Input Diodes SINGLE-ENDED DIODE DIFFERENTIAL DIODE n n n n n Single-Ended or Differential Measurements Series Resistance Error Cancellation Noise Reduction When Used as CJC Sensor Programmable Excitation Current: 10μA - 640μA Programmable Ideality Factor (η) Error Contribution and Peak Noise Errors SENSOR TYPE TEMPERATURE RANGE SYSTEM ACCURACY PEAK-TO-PEAK NOISE Type K Thermocouple –200°C to 0°C 0°C to 1372°C ±(Temperature • 0.23% + 0.05)°C ±(Temperature • 0.12% + 0.05)°C ±0.08°C Type J Thermocouple –210°C to 0°C 0°C to 1200°C ±(Temperature • 0.23% + 0.05)°C ±(Temperature • 0.10% + 0.05)°C ±0.07°C Type E Thermocouple –200°C to 0°C 0°C to 1000°C ±(Temperature • 0.18% + 0.05)°C ±(Temperature • 0.10% + 0.05)°C ±0.06°C Type N Thermocouple –200°C to 0°C 0°C to 1300°C ±(Temperature • 0.27% + 0.08)°C ±(Temperature • 0.10% + 0.08)°C ±0.13°C Type R Thermocouple 0°C to 1768°C ±(Temperature • 0.10% + 0.4)°C ±0.62°C Type S Thermocouple 0°C to 1768°C ±(Temperature • 0.10% + 0.4)°C ±0.62°C Type B Thermocouple 400°C to 1820°C ±(Temperature • 0.10%)°C ±0.83°C Type T Thermocouple –250°C to 0°C 0°C to 400°C ±(Temperature • 0.15% + 0.05)°C ±(Temperature • 0.10% + 0.05)°C ±0.09°C External Diode (2 Reading) –40°C to 85°C ±0.25°C ±0.05°C External Diode (3 Reading) –40°C to 85°C ±0.25°C ±0.2°C –200°C to 800°C –200°C to 800°C –200°C to 800°C –200°C to 800°C ±0.1°C ±0.1°C ±0.1°C ±0.1°C ±0.05°C ±0.05°C ±0.02°C ±0.01°C –40°C to 85°C ±0.1°C ±0.01°C Platinum RTD - PT-10, RSENSE = 1kΩ Platinum RTD - PT-100, RSENSE = 2kΩ Platinum RTD - PT-500, RSENSE = 2kΩ Platinum RTD - PT-1000, RSENSE = 2kΩ Thermistor, RSENSE = 10kΩ System Benefits 20 UNIVERSAL INPUTS ALLOW COMMON H/W SHARING FOR DIFFERENT SENSOR TYPES 10ppm/°C REFERENCE LTC2983 STANDARD COEFFICIENTS STORED IN ROM ELIMINATE LOOKUP TABLES ROM ADC1 CH1 TO CH20 EEPROM BUFFERED INPUTS ALLOW EXTERNAL PROTECTION AND FILTERING WITHOUT DROOP ERRORS KEY-PROTECTED EEPROM RETAINS RAM DATA FOR AT LEAST 10 YEARS (LTC2984) 21:6 MUX RAM COM 24-BIT ∑ΔADCs AND 15PPM REFERENCE ENABLE BENCHTOP ACCURACY MEASUREMENTS ADC2 PROCESSOR ADC3 ROTATABLE CURRENT SOURCES ELIMINATE THERMOCOUPLE EFFECTS IN RESISTIVE MEASUREMENTS EXCITATION CURRENT SOURCES CUSTOM COEFFICIENTS STORED IN RAM ACCOMMODATE CUSTOM SENSORS BUILT-IN LINEARIZATION AND FAULTS ALLEVIATE CODING AND HOST PROCESSOR RESOURCES SPI INTERFACE PROVIDES CONVENIENT DEVICE CONFIGURATION AND SENSOR READOUT IN °C OR °F Hardware and Software Development Evaluation QuikEval™ GUI Software Code Development Arduino IDE (C Coding Environment with Libraries & Examples) Linduino™ ONE DC2026 Linduino DC2296 (LTC2983) or DC2420 (LTC2984) DEMO KIT THERMOCOUPLE BOARD DC2212 LTC2983 or LTC2984 MOTHERBOARD RTD BOARD DC2213 20 INPUT BREAKOUT BOARD DC2210 20-INPUT UNIVERSAL 4-INPUT 4 INPUT BOARD DC2211 THERMISTOR BOARD DC2214 www.linear.com/2983 n 1-800-4-LINEAR 0515B