Features

• Directly Digitizes 2-, 3-, or 4-Wire RTDs, Thermocouples, Thermistors, and Diodes
• On-Chip EEPROM (LTC2986-1) Stores Channel Configuration Data and Custom Coefficients
• Single 2.85V to 5.25V Supply
• 10 Flexible Inputs Allow Interchanging Sensors
• Automatic Thermocouple Cold Junction Compensation
• Built-In Standard and User-Programmable Coefficients for Thermocouples, RTDs and Thermistors
• Measures Negative Thermocouple Voltages
• Automatic Burn Out, Short-Circuit and Fault Detection
• Buffered Inputs Allow External Protection
• Simultaneous 50Hz/60Hz Rejection
• Includes 15ppm/°C (Max) Reference
• Includes Special Protection Modes
• Demo Software with Configuration Checker and C-Code Generation Tool

Typical Application

Description

The LTC2986 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 LTC2986 can measure the temperature of virtually all standard (Type B, E, J, K, N, S, R, T) or custom thermocouples, automatically compensate 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 LTC2986 includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor.

The LTC2986/LTC2986-1 are 10-channel software and pin-compatible versions of the 20-channel LTC2983/LTC2984. Additional features include special modes that enable easy protection in universal multi-sensor applications, custom tables for generic ADC readings, and direct temperature readout from active analog temperature sensors. The LTC2986-1 is the EEPROM version of the LTC2986.