MAX31850NATB+

Sensor And Detector Interfaces Overview

The MAX31850NATB+ is a cold-junction compensated, 1-Wire thermocouple-to-digital converter. It digitizes signals from N-type thermocouples with a resolution of 0.25°C and supports readings from -270°C to +1300°C. The device operates on a single data line (DQ) and ground, allowing parasite power mode where energy is drawn directly from the bus. It features integrated fault detection for open circuits or shorts to VDD/GND. Communication utilizes a unique 64-bit ROM code for multi-drop addressing. Supply voltage ranges from 3.0V to 3.7V, with an operating temperature range of -40°C to +125°C in a 10-TDFN package.

Sensor And Detector Interfaces Feature Summary

• Integrated cold-junction compensation and 14-bit analog-to-digital conversion
• Single-wire 1-Wire interface supporting parasite power operation
• Built-in diagnostics for thermocouple open circuits and supply/ground shorts

Sensor And Detector Interfaces Applications

• Industrial process monitoring
• HVAC systems
• Medical equipment

Sensor And Detector Interfaces Procurement Notes

Verify the specific suffix 'NA' confirms the N-type thermocouple compatibility and TDFN-EP packaging. Confirm RoHS compliance status and lead-free specifications against current manufacturer documentation. Ensure the ordering part number matches the exact thermal and electrical requirements for the target application environment.

Sensor And Detector Interfaces Selection Notes

Select this component when a single-wire communication protocol is required to minimize wiring complexity in distributed sensor networks. The N-type variant is appropriate for high-temperature applications requiring superior stability compared to K-type sensors. Verify that the microcontroller supports the 1-Wire protocol timing and strong pullup requirements during active conversion cycles.

Sensor And Detector Interfaces Part Context

This device belongs to the MAX31850/MAX31851 family of cold-junction compensated converters. The MAX31850 series specifically supports K, J, N, T, and E-type thermocouples, while the MAX31851 supports S and R types. The 'N' designation indicates the internal calibration is optimized for N-type thermocouple characteristics.

Sensor And Detector Interfaces Replacement Considerations

MAX31850KATB+T: Compatible alternative calibrated for K-type thermocouples instead of N-type.

Sensor And Detector Interfaces FAQ

How does the MAX31850NATB+ handle power consumption during temperature conversions?

During active conversion, the device draws up to 1.75mA. In parasite power mode, a strong pullup resistor must be activated on the DQ line within 10µs of issuing the Convert T command to prevent voltage drops.

What fault conditions can the MAX31850NATB+ detect?

The device detects open thermocouple circuits, shorts to VDD, and shorts to GND. These faults are indicated by specific bits in the internal cold-junction temperature register.