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====== EVAL-CN0575-RPIZ User Guide ======

===== General Description =====
The **[[adi>CN0575 | EVAL-CN0575-RPIZ]]** is a 10BASE-T1L MAC/PHY interface with Single Pair Power over Ethernet (SPoE) for development of field devices and applications on a Raspberry Pi platform board. The SPoE powered device (PD) and isolated flyback regulator provide 5 V power to the platform board and attached application circuitry. SPoE Class 12 (8.4 W, 24 V nominal) and Class 13 (7.7 W, 55 V nominal) are supported.

Designed for use on the Raspberry Pi platform, the CN0575 hardware features a 40-pin GPIO header, and follows the same mechanical dimensions as a standard HAT.
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To allow board stacking and development of field device applications using Raspberry Pi HATs, an additional GPIO header with extended leads is included with each evaluation board. However, the **[[adi>CN0575]]** can also be used on its own as a basic temperature sensing field device with remote user input/output via an onboard button and LED.
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:63305_2.jpg?nolink&400 |}}

===== Evaluation Board Hardware =====
   
==== Primary Side ====
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:eval-cn0575-rpiz-top-with-labels.png?nolink&600 |}}
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=== 10BASE-T1L Port (P1 and P2) ===
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:10base-t1l-port.jpg?nolink&200|}}
The **[[adi>CN0575]]** evaluation board uses a single port 10BASE-T1L device and can be connected to a link partner using either one of the two physical connectors provided:

  * The **P1 terminal block** is used for connecting individual wires. Connect the twisted pair to pins 1 and 2, and the shield (if available) to pin 3. Secure the connections by tightening the screws on the terminal block.
  * The **P2 port** is used for connecting standard IEC 63171-6 cables directly from a 10BASE-T1L-capable controller unit.
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=== PHY Status Indicators (LED0 and LED1) ===
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:adin1110-leds.jpg?nolink&150|}}
**LED0** and **LED1** are the [[adi>ADIN1110]] status indicators, and can be configured to display various activities via the device registers.
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By default, **LED0** is set to turn on when a link is established and blink when there is activity; while **LED1** is disabled. Refer to the LED Control Register in the [[adi>ADIN1110]] data sheet for a full list of available functions.
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=== General Purpose LED and Button (ALERT and TEST) ===
The [[adi>CN0575 | EVAL-CN0575-RPIZ]] evaluation board includes a simple button (**TEST**) and LED (**ALERT**) circuit that can be respectively used as a digital input and a general purpose indicator. This circuit is controlled by the Raspberry Pi by default (via **GPIO16** and **GPIO26**), but can alternatively be used with external hardware by changing the appropriate jumper settings (refer to Connecting the General Purpose LED and Button to External Hardware).
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The **GPIO16** pin is normally pulled high in this circuit, but will read low when the **TEST** button is pressed.
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=== SPoE PD Power Class Selection (JP1 and JP2) ===
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:ltc9111-jumpers.jpg?nolink&150|}}
By default, the [[adi>LTC9111]] SPoE PD controller included in the [[adi>CN0575]] circuit is configured for PD Class 12. If a different PD class is required for the application, the **JP1** and **JP2** solder jumpers should be reconfigured to match the desired class.
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^  JP1 Shunt Position   ^  JP2 Shunt Position   ^  PD Class  ^  V<sub>PD(min)</sub>  ^  P<sub>PD(max)</sub>  ^
|  <fc #008000>Across Pins 2 and 3</fc>  |  <fc #008000>Across Pins 2 and 3</fc>  |  <fc #008000>10</fc>        |  14 V                 |  <fc #008000>1.23 W</fc>               |
|  <fc #008000>Across Pins 2 and 3</fc>  |  <fc #008000>No Shunt Inserted</fc>    |  <fc #008000>11</fc>        |  :::                  |  <fc #008000>3.20 W</fc>               |
|  **<fc #008000>Across Pins 2 and 3</fc>**  |  **<fc #008000>Across Pins 1 and 2</fc>**  |  **<fc #008000>12</fc>**        |  :::                  |  **<fc #008000>8.40 W</fc>**               |
|  **<fc #008000>Across Pins 1 and 2</fc>**  |  **<fc #008000>Across Pins 2 and 3</fc>**  |  **<fc #008000>13</fc>**        |  35 V                 |  **<fc #008000>7.70 W</fc>**               |
|  <fc #ff0000>Across Pins 1 and 2</fc>  |  <fc #ff0000>No Shunt Inserted</fc>    |  <fc #ff0000>14</fc>        |  :::                  |  <fc #ff0000>20.0 W</fc>               |
|  <fc #ff0000>Across Pins 1 and 2</fc>  |  <fc #ff0000>Across Pins 2 and 3</fc>  |  <fc #ff0000>15</fc>        |  :::                  |  <fc #ff0000>52.0 W</fc>               |

<WRAP center round info 60%>
The [[adi>CN0575]] was designed and evaluated for PD Classes 12 and 13. However, Classes 10 and 11 may still be usable, depending on the power requirements of the Raspberry Pi model used (and its peripherals).
</WRAP>

<WRAP center round important 60%>
Warning: Do not use PD Classes 14 and 15. The [[adi>CN0575 | EVAL-CN0575-RPIZ]] evaluation board is not designed to handle these higher power specifications.
</WRAP>
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==== Secondary Side ====
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:eval-cn0575-rpiz-bottom-with-labels.png?nolink&600 |}}
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=== ADIN1110 SW Power-Down Enable and SPI Configuration (JP3 to JP5) ===
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:jp3-jp4-jp5.jpg?nolink&250|}}
The [[adi>CN0575 | EVAL-CN0575-RPIZ]] evaluation board uses the default hardware configuration for the PHY specified in the [[adi>ADIN1110]] data sheet. If a different operating mode is required for the application, the [[adi>ADIN1110]] should first be placed into software power-down and then configured appropriately via the device registers.
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Refer to the table below on setting the **JP3** jumper to enable/disable the software power-down feature:
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^  JP3 Setting  ^ Software Power-Down Configuration  ^
|  Open         | PHY enters software PD mode after a reset operation (Default).  |
|  Shorted      | PHY does not enter software PD mode after a reset operation.    |
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The [[adi>ADIN1110]] supports both generic SPI and the OPEN Alliance SPI protocol in its communication. Refer to the table below on setting **JP4** and **JP5** to select the SPI protocol:
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^  JP4 Setting   ^  JP5 Setting  ^ SPI Protocol  ^
|  Open          |  Open         | OPEN Alliance with Protection            |
|  Open          |  Shorted      | OPEN Alliance without Protection         |
|  Shorted       |  Open         | Generic SPI with 8-bit CRC               |
|  Shorted       |  Shorted      | Generic SPI without 8-bit CRC (Default)  |
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=== ADT75 I²C Bus Address Selection (JP6 to JP8) ===
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:jp6-jp7-jp8.jpg?nolink&125|}}
The I²C bus address of the onboard [[adi>ADT75]] temperature sensor is dependent on the settings of the **JP13**, **JP14**, and **JP15** solder jumpers. **Note:** The CN0575 device tree overlay in ADI Kuiper Linux has the temperature sensor I²C address set to the default 0x48.\\
If there is a need to reassign the [[adi>ADT75]] address, refer to the following table:
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^  Jumper Settings  ^^^  I2C Bus Address  ^
^  JP6  ^  JP7  ^  JP8  ^  :::  ^
|  B    |  B    |  B    |  0x48 (Default)  |
|  B    |  B    |  A    |  0X49            |
|  B    |  A    |  B    |  0X4A            |
|  B    |  A    |  A    |  0X4B            |
|  A    |  B    |  B    |  0X4C            |
|  A    |  B    |  A    |  0X4D            |
|  A    |  A    |  B    |  0X4E            |
|  A    |  A    |  A    |  0X4F            |
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=== Optional GPIO Pins (JP9 to JP13) ===

By default, some functions of the [[adi>CN0575 | EVAL-CN0575-RPIZ]] are connected to various GPIO pins of the Raspberry Pi. If these features will not be used in the application, the corresponding jumpers can be removed - doing this will allow these GPIO pins to be used for other external hardware.
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:jp11-jp12-jp13.jpg?nolink&300 |}}
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^  Jumper  ^  GPIO  ^  Circuit Function  ^ Description  ^
|  JP9  |  GPIO27  |  [[adi>ADIN1110]] Reset  |  This an active low [[adi>ADIN1110]] input that resets the part when held low for >10 μs.  |
|  JP10  |  GPIO22  |  [[adi>ADIN1110]] Link Status Output  | This is an active high [[adi>ADIN1110]] output that indicates whether a valid 10BASE-T1L link has been established.  |
|  JP11  |  GPIO23  |  Time Stamp Capture Signal  | Assert this pin to timestamp the latest incoming frame received by the [[adi>ADIN1110]]. The captured timestamp will be stored in the **TS_EXT_CAPT0** and **TS_EXT_CAPT1** registers.  |
|  JP12  |  GPIO24  |  Time Stamp Timer Signal  | This pin is connected to the **TS_TIMER** pin of the [[adi>ADIN1110]]. When the **TS_TIMER** output is enabled in the device registers, a waveform with high and low times set by the **TS_TIMER_HI** and **TS_TIMER_LO** registers is generated.  |
|  JP13  |  GPIO6  |  Overtemperature Indicator  | This pin is asserted when the onboard [[adi>ADT75]] temperature sensor is put into one-shot mode and the temperature measurement exceeds T<sub>OS</sub> (80 °C; default value). By default, the indicator is active low and will only be de-asserted when the temperature drops below T<sub>HYST</sub> (75 °C; default value). The temperature sensor can be reprogrammed to change the polarity of this pin, the de-assertion requirement, and the values of T<sub>OS</sub> and T<sub>HYST</sub>.  |
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=== General Purpose LED and Button Connections (JP14 and JP15) ===
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:jp14-jp15.jpg?nolink&125|}}
While normally functioning as a digital input and general purpose indicator respectively, the **TEST** button and **ALERT** LED can alternatively be used for external applications by changing the settings of the appropriate jumpers. **JP14** is used to set the button connection, while **JP15** is used to set the LED connection.
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^  JP14 Setting  ^ Connection  ^
|  Open          | **TEST** button is connected to **GPIO16** of the Raspberry Pi (Default).  |
|  Shorted       | **TEST** button is not connected to the Raspberry Pi.                  |
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^  JP15 Setting  ^ Connection  ^
|  Open          | **ALERT** LED is connected to **GPIO26** of the Raspberry Pi (Default).  |
|  Shorted       | **ALERT** LED is not connected to the Raspberry Pi.                  |
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<WRAP center round tip 60%>
External hardware can be connected to the **TEST** button and **ALERT** LED using the **BTN_IO** and **LED_IO** test points, respectively.
</WRAP>
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===== System Setup =====
==== Required Equipment ====
=== Hardware ===
  * [[adi>CN0575 | EVAL-CN0575-RPIZ]] Circuit Evaluation Board
  * Raspberry Pi Model 3B (or higher)
  * Micro-SD Card for Raspberry Pi
  * 10BASE-T1L media converter, either:
    * [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] Product Evaluation Board
    * Other 10BASE-T to 10BASE-T1L media converter
    * USB to 10BASE-T1L
  * Power Source, either:
    * 10BASE-T1L Power Coupling Network Board w/ SPoE PSE or DC Power Supply
    * USB-C or USB-Micro 5V wall adapter (plugged directly into Raspberry Pi)
  * Host Windows, Linux, or Mac computer

=== Software ===
  * [[resources/tools-software/linux-software/kuiper-linux | Analog Devices Kuiper Linux]]
  * [[https://www.putty.org/ | PuTTY]]

=== Documentation ===
  * [[adi>CN0575]] Circuit Note
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==== Block Diagram ====
=== Setup with SPoE via PSE or DC Power Supply: ===
<WRAP todo>
Power coupling boards compatible with the EVAL-ADIN1100 for various SPoE classes and droop levels are in development. Alternatively, use a media converter that supports SPoE PSE functionality.
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Refer to the LTC4296-1 datasheet for example coupling networks.
</WRAP>

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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:test-setup-block-diagram.png?800 |}}
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=== Setup without SPoE (USB-Powered Application): ===
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:block_diagram-new-2.png?800 |}}
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==== Software Setup ====

=== Downloading and Flashing the Micro-SD Card ===
To use the [[adi>CN0575 | EVAL-CN0575-RPIZ]] with the Raspberry Pi, the micro-SD card should be preloaded with [[resources/tools-software/linux-software/kuiper-linux | Analog Devices Kuiper Linux]], a distribution based on Raspbian from the Raspberry Pi Foundation that incorporates Linux drivers for ADI products as well as tools and other software products.
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Complete instructions, including where to download the SD card image, how to write it to the micro-SD card, and how to configure the system are provided at **[[:resources:tools-software:linux-software:kuiper-linux |Kuiper Images]]**.
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{{ :university:labs:software:iio_intro_toolbox:command_prompt.png?400 |}}
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=== Configuring the Micro-SD Card ===
The Linux kernel requires a matching device tree overlay to identify the devices on the CN0575. The overlay file is included with the [[resources/tools-software/linux-software/kuiper-linux | Analog Devices Kuiper Linux]] and simply needs to be enabled.
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To do this, follow the Hardware Configuration procedure under **Configuring the SD Card for Raspberry Pi Projects** in the [[:resources:tools-software:linux-software:kuiper-linux |Kuiper Images]] page. Enable the CN0575 overlay by adding the following line to //config.txt//:

<code>
dtoverlay=rpi-cn0575
</code>
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Save the file and reboot the system by entering the following command in the console:

<code>
analog@analog:~$ sudo reboot
</code>
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=== Determining the IP Address of the CN0575 ===
Follow the below procedure to determine the IP address assigned by the Raspberry Pi to the [[adi>CN0575 | EVAL-CN0575-RPIZ]]:
  - Complete the hardware setup described in the Basic Operation section.
  - Remove the Ethernet cable from the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] evaluation board and connect it directly to the Raspberry Pi.
  - Run PuTTY and connect to the Raspberry Pi via SSH. For the Host Name (or IP address), use **analog.local**.
  - Enter the command //ifconfig// in the console.
  - The IP address of the [[adi>CN0575 | EVAL-CN0575-RPIZ]] board will be listed as inet under adin1110-0. In the example below, the IP address is 169.254.158.120.
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:ifconfig.png?nolink&600 |}}
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==== Basic Operation ====
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:setup.jpg?nolink&600 |}}
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To establish a 10BASE-T1L connection to a Raspberry Pi using the [[adi>CN0575 | EVAL-CN0575-RPIZ]] evaluation board and run a basic temperature measurement example, follow the below procedure:

  - Ensure that the jumpers and switches of the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] are configured to the default settings.
  - Insert the micro-SD card into its slot on the Raspberry Pi.
  - Connect the [[adi>CN0575 | EVAL-CN0575-RPIZ]] circuit evaluation board to the Raspberry Pi GPIO header.
  - Using an Ethernet cable, connect **P5** on the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] evaluation board to an RJ-45 port on the computer.
  - Using a micro-USB cable, connect **P401** on the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] evaluation board to a USB port on the computer.
  - __Operation with SPoE PSE or DC Power Supply: //(Skip to step 7 if using a USB wall adapter instead)//__
       * Set the output of the PSE or DC power supply to either 24V (Class 12) or 55V (Class 13), depending on the settings of **JP1** and **JP2** on the CN0575 board.
       * Using wires, connect the output of an SPoE power coupler to the **P1** terminal block on the [[adi>CN0575 | EVAL-CN0575-RPIZ]] circuit evaluation board. Similarly, connect the data input of the power coupler to the **P101** terminal block on the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] evaluation board.
       * Connect the output of the SPoE PSE (or DC power supply) to the power input of the SPoE power coupler and enable it.
  - __Operation without SPoE //(USB-Powered Application)//:__
       * Using wires, connect the **P1** terminal block on the [[adi>CN0575 | EVAL-CN0575-RPIZ]] circuit evaluation board to the **P101** terminal block on the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] evaluation board.
       * Connect the USB wall adapter to the power connector on the Raspberry Pi.
  - Wait for the **LINK** LED on the [[adi>CN0575 | EVAL-CN0575-RPIZ]] circuit evaluation board and the **LED_0** LED on the [[adi>eval-adin1100 | EVAL-ADIN1100EBZ]] evaluation board to turn on and start blinking at the same time. This indicates that a 10BASE-T1L link has been established.
  - On the host PC, run PuTTY and connect to the Raspberry Pi using the [[adi>CN0575 | EVAL-CN0575-RPIZ]] IP address.
  - In the Raspberry Pi console, navigate to the examples directory of pyadi-iio. Run the temperature measurement example by entering the following command:
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<code>.../pyadi-iio/examples $ sudo python lm75_example.py</code>
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:adt75-example.png?nolink&500 |}}
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----
==== More Complete Example with Digital I/O ====
A more complete example that blinks the onboard LED and reads the push button is also provided. Note that this script can be run either directly on the Raspberry Pi, or remotely from a host computer.
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From the Raspberry Pi command line, run:
<code>.../pyadi-iio/examples $ sudo python cn0575_example.py</code>
Or from PowerShell on a Windows remote host, run:
<code>...\pyadi-iio\examples> python .\cn0575_example.py</code>
The script will attempt to automatically locate the CN0575 over the network connection. The CN0575's IIO context URI can also be passed to the script explicitly, where **www.xxx.yyy.zzz** is the board's IP address:
<code>C:\temp\pyadi-iio\examples> python .\cn0575_example.py ip:www.xxx.yyy.zzz</code>
Typical output is shown below:
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{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:cn0575_example_screenshot.png?nolink&500 |}}
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----

===== Errata =====
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0575:c16_marking.png?nolink&100|}}
The first batch of [[adi>CN0575 | EVAL-CN0575-RPIZ]] circuit evaluation boards that was produced mistakenly have a 50V capacitor installed on C16. This voltage rating is insufficient for Class 13 operation where the SPoE voltage can be as high as 58 V (and potentially even more during surge events).
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These boards can be identified by the last three letters on C16 (HTH, shown right). If you have one of these and intend to use it in a Class 13 application, either replace C16 with a 100 V capacitor (preferred; this is the same rating used in later batches of the [[adi>CN0575 | EVAL-CN0575-RPIZ]]), or simply desolder it and leave it empty.
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===== Schematic, PCB Layout, Bill of Materials =====

<WRAP round 80% download>

[[adi>cn0575-designsupport|EVAL-CN0575-RPIZ Design & Integration Files]]
  * Schematics 
  * PCB Layout 
  * Bill of Materials 
  * Allegro Project
</WRAP>
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===== Additional Information and Useful Links =====

  * [[ADI>CN0575|CN0575 Circuit Note Page]]
  * [[ADI>CN0575-DesignSupport|CN0575 Design Support Package]]
  * [[ADI>ADIN1110|ADIN1110 Product Page]]
  * [[ADI>ADT75|ADT75 Product Page]]
  * [[ADI>LTC9111|LTC9111 Product Page]]
  * [[ADI>LT8304|LT8304 Product Page]]
  * [[:resources:tools-software:linux-drivers:net-mac-phy:adin1110|ADIN1110 Linux Driver]]
  * [[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/hwmon/lm75.c?id=HEAD|ADT75 Linux Driver]]
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===== Hardware Registration =====

<WRAP round tip 80% >
Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware.  [[reg>EVAL-CN0575-RPIZ?&v=RevC|Register]] to receive all these great benefits and more!
</WRAP>

// End of Document //
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