LTM2985IY#PBF

LTM2985 is a isolated high accuracy digital temperature measurement system with EEPROM. It 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. It 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. It includes excitation current sources and fault detection circuitry appropriate for each type of temperature sensor. It provides 5KV isolated power and SPI interface to the precision temperature-to-bits converter. It also includes a user-programmable EEPROM for custom sensor data. It is used in applications such as direct thermocouple measurements, direct RTD measurements, direct thermistor measurements, custom sensor applications etc.

• 10 flexible inputs allow interchanging sensors
• Automatic thermocouple cold junction compensation
• Built-in standard and user-programmable coefficients for thermocouples, RTDs and thermistors
• Automatic burn out, short-circuit and fault detection
• Buffered inputs allow external protection, includes special protection modes
• On-chip EEPROM stores channel configuration data and custom coefficients
• Input supply voltage is 5V typ, input supply current is 80mA max at (ON = VL, no load)
• Resolution is 24bits, integral nonlinearity is 2ppm of VREF typ at ( TA = 25°C)
• Offset error is 0.5μV typ at (TA = 25°C), output voltage noise is 4μVP-P typ at (0.1Hz ≤ f ≤ 10Hz)
• Operating temperature range from -40°C to 85°C, package style is 66-lead BGA

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