.. <HotRIODatasheet>

HotRIO F-HEE-DIO-24V-8I8O
=========================

.. <HotRIODataSheetMetaData>
.. {   
..      "Designer"      :   "F4E",
..      "Product"       :   "HotRIO",
..      "Series"        :   "Eurocard",
..      "Role"          :   "Expansion",
..      "Designation"   :   "DIO-24V-8I8O",
..      "CodeName"      :   "",
..      "BoardImage"    :   "./source/boards/images/F-HEE-DIO-24V-8I8O_axi.png",
..      "Brief"         :   "Eurocard expansion board featuring 8 digital inputs and 8 digital outputs, designed for interfacing with 24V nominal copper signals and fully isolated."
.. }
.. </HotRIODataSheetMetaData>

The datasheet for this board is available `here <../../datasheets/F-HEE-DIO-24V-8I8O.pdf>`_.

.. <HotRIODatasheetSummaryLeftColumn>

The F-HEE-DIO-24V-8I8O is a HotRIO Eurocard expansion module designed for seamless integration with a HotRIO controller board via a Eurocard Type A backplane. It features eight digital input channels and eight digital output channels, each with a fixed direction and dedicated function. All channels support copper signal paths operating within a 12–36 V range (nominally 24 V), making the board well-suited for industrial control applications.

.. </HotRIODatasheetSummaryLeftColumn>

.. image:: ./../images/F-HEE-DIO-24V-8I8O_axi.png
   :alt: Axisymmetric view of the HotRIO F-HEE-DIO-24V-8I8O
   :align: center

Key features
------------

.. <HotRIODatasheetKeyPoints>

* 8 digital inputs and 8 digital outputs, each fully isolated
* Supports 12–36 V (nominal 24 V) copper signal interfacing
* Seamless Eurocard backplane integration with HotRIO controllers
* Galvanic isolation using high-speed digital isolators for robust protection

.. </HotRIODatasheetKeyPoints>

Technical Specifications
------------------------

.. <HotRIODatasheetTechSpecs>

+---------------------------+----------------------------------------------------------------------------------------------+
| Form factor               | 100x160 mm (Eurocard)                                                                        |
+---------------------------+----------------------------------------------------------------------------------------------+
| Mounting                  | Eurocard chassis                                                                             |
+---------------------------+----------------------------------------------------------------------------------------------+
| Backplane interface       | HotRIO Type A                                                                                |
+---------------------------+----------------------------------------------------------------------------------------------+
| Digital inputs            | 8 (12–36 V, nominal 24 V, fully isolated)                                                    |
+---------------------------+----------------------------------------------------------------------------------------------+
| Digital outputs           | 8 (12–36 V, nominal 24 V, fully isolated)                                                    |
+---------------------------+----------------------------------------------------------------------------------------------+
| Isolation method          | High-speed digital isolators                                                                 |
+---------------------------+----------------------------------------------------------------------------------------------+
| Input/output connector    | DB-37 (front panel)                                                                          |
+---------------------------+----------------------------------------------------------------------------------------------+
| Power supply              | 5V DC (from backplane)                                                                       |
+---------------------------+----------------------------------------------------------------------------------------------+
| Power consumption         | TBD W                                                                                        |
+---------------------------+----------------------------------------------------------------------------------------------+

.. </HotRIODatasheetTechSpecs>

.. <HotRIODatasheetSummaryLeftColumn>

To ensure robust electrical isolation, each input and output channel is fully isolated using high-speed digital isolators. This design enhances safety and reliability by protecting both the controller and connected field devices from transients, ground loops, and electrical noise.

Functionally, the board acts as a transparent signal interface between the front DB-37 connector (field wiring) and the rear backplane connector. The only active components present are for signal conditioning. Signals received from the backplane—originating from the controller board’s FPGA—first pass through a voltage level shifter (converting 1.8 V to 3.3 V), followed by digital isolation. 

This architecture provides galvanic isolation between the Eurocard chassis and external field devices, ensuring safe and noise-immune communication across system boundaries.

.. </HotRIODatasheetSummaryLeftColumn>

.. <HotRIODatasheetSummaryRightColumn>

.. \includegraphics[width=9cm]{./source/boards/images/F-HEE-DIO-24V-8I8O_summary.png}

.. </HotRIODatasheetSummaryRightColumn>