NORVI X-RTD4 | DATASHEET

The NORVI X-RTD4 is a 4-channel RTD acquisition expansion module designed for the NORVI X modular controller platform. It enables accurate temperature measurement using 2-wire RTD sensors, with a single MAX31865 RTD-to-digital converter shared across four RTD inputs via an analog multiplexer.

The module is optimized for industrial temperature monitoring applications where multiple RTD sensors are required with minimal hardware complexity.

Product Features #

• 4 × RTD temperature input channels
• Supports 2-wire RTD sensors
• High-accuracy MAX31865 RTD reader
• Multiplexed RTD input architecture
• SPI interface via NORVI X expansion bus
• Compact industrial expansion module design

System Architecture #

• RTD Reader IC: MAX31865
• Input Selection: Analog multiplexer
• RTD Channels: 4 (selected sequentially via multiplexer)
• Communication: SPI (shared across channels)

Applications #

• Industrial temperature monitoring
• Multi-point temperature sensing
• HVAC and building automation systems
• Process control systems
• Energy management and thermal monitoring
• Environmental monitoring
• OEM and system integrator solutions
• Data acquisition systems

Product Block Diagram #

Main #

Complementary #

Mechanical Properties #

Environment #

Electrical Characteristics #

Grid Powered Devices #

I/O Specifications #

Terminal Configuration #

GPIO Utilization #

Multiplexer Control #

The RTD input multiplexer is controlled directly from the expansion bus digital I/O lines.

These address lines select one of the four RTD channels to be connected to the MAX31865 at any given time.

Channel Selection Logic #

Expansion Port #

Utilized GPIO Connections are highlighted in Green. They cannot be used for any other purpose with this module connected.