LTM2985 Datasheet | Analog Devices

FEATURES n 5000VRMS Isolated Power and SPI Interface n Directly Digitizes 2-, 3- or 4-Wire RTDs, Thermocouples, Thermistors and Diodes n 10 Flexible Inputs Allow Interchanging Sensors n Automatic Thermocouple Cold Junction pensation n Built-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and Thermistors n Automatic Burn Out, Short-Circuit and Fault Detection n Buffered Inputs Allow External Protection n Simultaneous 50Hz/60Hz Rejection n Includes 15ppm/°C (Max) Reference n Includes Special Protection Modes n On-Chip EEPROM Stores Channel Configuration Data and Custom Coefficients APPLICATIONS n Direct Thermocouple Measurements n Direct RTD Measurements n Direct Thermistor Measurements n Custom Sensor Applications DESCRIPTION The LTM®2985 measures a wide variety of temperature sensors and digitally outputs the result, in °C or °F, with 0.1°C accuracy and 0.001°C resolution. The LTM2985 can measure the temperature of virtually all standard (Type B, E, J, K, N, S, R, T) or custom thermocouples, automatically pensate for cold junction temperatures and linearize the results. The device can also measure temperature with standard 2-, 3- or 4-wire RTDs, thermistors and diodes. The LTM2985 includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor. The LTM2985 is an isolated 10-channel temperature measurement system software patible with the LTC2986-1. It provides 5k V isolated power and SPI interface to the precision temperature-to-bits converter. The LTM2985 also includes a user-programmable EEPROM for custom sensor data. All registered trademarks and trademarks are the property of their respective owners. Patents Pending TYPICAL APPLICATION Universal Isolated Temperature Measurement System THER- THER- 2-WIRE 3-WIRE 4-WIRE MOCOUPLE MISTOR RTD RTD RTD 2 32 43 RP1 RP2 RP3 RP4 RP5 RP7 RP8 RP6 COLD JUNCTION RTD OR THERMISTOR OR DIODE OR ANALOG TEMP CH1 RSENSE CH2 CH3 CH4 CH5 CH6 CH7...