Description:
The MAX31855 is a sophisticated thermocouple-to-digital converter with a built-in 14-bit analog-to-digital converter (ADC). The device also contains cold-junction compensation sensing and correction, a digital controller, an SPI-compatible interface, and associated control logic. The device is designed to work in conjunction with an external microcontroller (FC) in thermostatic, process-control, or monitoring applications. The device is available in several versions, each optimized and trimmed for a specific thermocouple type (K, J, N, T, S, R, or E.). The thermocouple type is indicated in the suffix of the part number. The data is output in a signed 14-bit, SPI-compatible, read-only format. This converter resolves temperatures to 0.25NC, allows readings as high as +1800NC and as low as -270NC, and exhibits thermo-couple accuracy of ±2NC for temperatures ranging from -200NC to +700NC for K-type thermocouples.
Application:
industrial
Appliances
HVAC
Automotive
Features:
Cold-Junction Compensation
14-Bit, 0.25NC Resolution
Versions Available for K-, J-, N-, T-, S-, R-, and E-Type Thermocouples (see Table 1)
Simple SPI-Compatible Interface (Read-Only)
Detects Thermocouple Shorts to GND or VCC
Detects Open Thermocouple
supply Voltage Range (VCC to GND): -0.3V to +4.0V
All Other Pins: -0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70NC)
ESD Protection (All Pins, Human Body Model): ±2kV
Operating Temperature Range: -40NC to +125NC
Junction Temperature: +150NC
Storage Temperature Range: -65NC to +150NC
Lead Temperature (soldering, 10s): +300NC
Soldering Temperature (reflow): +260NC