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====== EVAL-CN0552-PMDZ Overview ======

The ** [[ADI>CN0552|EVAL-CN0552-PMDZ]] ** is a [[https://reference.digilentinc.com/pmod/start|PMOD]] form-factor evaluation board for the [[ADI>AD7746|AD7746]], a high resolution, Σ-Δ capacitance-to-digital converter (CDC). The architecture features inherent high resolution (24-bit no missing codes, up to 21-bit effective resolution), high linearity (±0.01%), and high accuracy (±4 fF factory calibrated).

{{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:actual_hardware.jpg?200 }}
<wrap center 55%>
//<fc>Figure 1. EVAL-CN0552-PMDZ</fc>//
</wrap>

The [[ADI>CN0552|CN0552]] has two capacitive inputs with each channel that can be configured as single-ended or differential. The capacitance input range is ±4.096 pF at a maximum bulk capacitance of 17 pF but is capable of extending up to ±50 pF with a maximum bulk capacitance of 200 pF which can be balanced by a programmable on-chip, digital-to-capacitance converter (CAPDAC). 

{{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:cn0552_block_diagram.png?600 }}
<wrap center 55%>
//<fc>Figure 2. CN0552 Block Diagram</fc>//
</wrap>

The output data rate is adjustable from 9.1 sps to 90.9 sps, with the 16.1 sps setting providing strong rejection of both 50Hz and 60Hz power line noise. The CDC also provides temperature measurement with a resolution of 0.1°C and accuracy of ±2° C for temperature compensation and system calibration.

The CN0552 is compatible with I2C PMOD platform boards, with an I/O voltage from 2.7 V to 5.5 V.

<wrap center 60%>
{{:resources:eval:user-guides:circuits-from-the-lab:cn0552:i2c_con.png?300| }}
</wrap>

<wrap center 48%>
//<fc>Figure 3. I2C Connection</fc>//
</wrap>

===== Features =====
  * Interfaces to single or differential floating sensors
  * Resolution down to 4aF (that is, up to 21 ENOB)
  * Accuracy: 4fF
  * Linearity: 0.01%
  * Common mode (not changing)  capacitance up to 17pF
  * Full-scale (changing) capacitance range: ±4pF
  * Tolerant of parasitic capacitance to ground up to 60pF
  * Update rate: 10Hz to 90Hz
  * Simultaneous 50Hz and 60Hz rejection at 16Hz

===== Connectors and Configuration =====
By default, the [[ADI>CN0552|EVAL-CN0552-PMDZ]] is configured to be controlled and power from the PMOD connector using standard connections.  
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:eval-cn0552-pmdztop-edited.png?nolink&650 |}}

==== CN0552 Inputs/Outputs Connections ====
All the analog and digital input/output pins available on the EVAL-CN0552-PMDZ are brought out to two(2) separate 8 row 0.1" through holes through connectors P8 and P13.
^   Connector P8                ^^   Connector P13                    ^^ 
^ Description    ^ Pin(s)        ^ Description           ^ Pin(s)      ^
| EXCA           | 1             | GND                   | 1           |
| EXCB           | 2             | VDD                   | 2           |
| EXC_EXTENDED   | 3             | GND                   | 3           |
| REFIN_POS      | 4             | VIN_NEG               | 4           |
| REFIN_NEG      | 5             | VIN_POS               | 5           |
| GND            | 6             | GND                   | 6           |
| CIN1_NEG       | 7             | CIN2_NEG              | 7           |
| CIN1_POS       | 8             | CIN2_POS              | 8           |
==== Digital Communications ====
The Digital communication on the EVAL-CN0552-PMDZ is accomplished using a new standard I2C PMOD port.

^   Connector P2     ^
^ Description  ^ Pin(s)  ^
| INT      | 6        |
| RST      | 5        |
| SCL      | 4        |
| SDA      | 3        |
| GND      | 2        |
| IOVDD    | 1        |

==== Solder Jumpers ====
Eight solder jumpers are available at the bottom of the board, if you want to change the operating modes.  See the schematic for more details. 

{{:resources:eval:user-guides:circuits-from-the-lab:cn0552:eval-cn0552-pmdztop-web.png?direct&500|}}
^ Description and default connection                                 ^ Solder Jumper    ^ Default Position    ^
| ADC SDA connection (pull-up SDA to VDD)                       | P1               | Shorted             |
| ADC SCL connection (pull-up SCL to VDD)                       | P7               | Shorted             |
| Extended Excitation Enable (connect A1 OUT to P8 pin 3)       | P14              | Shorted             |
| ADC REFIN(-) connection (connect GND and P8 pin 5)            | P3               | Open                |
| ADC REFIN(+) connection (connect GND and P8 pin 4)            | P9               | Open                |
| ADC CIN1(-) connection (connect GND to P8 pin 7)              | P4               | Open                |
| ADC CIN1(+) connection (connect GND to P8 pin 8)              | P10              | Open                |
| ADC CIN2(-) connection (connect GND to P13 pin 7)             | P5               | Open                |
| ADC CIN1(+) connection (connect GND to P13 pin 8)             | P11              | Open               |
| ADC VIN(-) connection (connect GND to P13 pin 4)              | P6               | Open                |
| ADC VIN(+) connection (connect GND to P13 pin 5)              | P12              | Open                |

==== Test Points ====
Also, four test points are available to probe the I2C interface.

===== Device Driver Support =====
There are two device driver solutions that are provided for controlling the **EVAL-CN0552-PMDZ** using the no-OS device driver on the **EVAL-ADICUP3029** platform and Linux device driver on the **Raspberry Pi** platform.\\

1. **EVAL-ADICUP3029**\\

  * The ADICUP3029 example application uses the [[ :resources:tools-software:uc-drivers:ad7746|AD7746 no-OS driver]] and emulates the Linux IIO framework through the [[repo>libtinyiiod|tinyiiod daemon library]]. The application communicates with the host computer via the serial backend, over a USB-UART physical connection. This facilitates rapid application development on a host computer, independent from embedded code development.

2. **Raspberry Pi**\\

  * The [[ :resources:tools-software:linux-drivers:iio-cdc:ad7745|Linux driver]] uses the Industrial Input/Output (IIO) framework, greatly simplifying the development of application code via the cross-platform Libiio library, which is written in C and includes bindings for Python, MATLAB, C#, and other languages. Application code can run directly on the platform board, communicating with the device over the local backend, or from a remote host over the network or USB backends.\\

Similarly, utility software such as iio_info, IIO Oscilloscope, PyADI-IIO, and etc. can be used for both the EVAL-CN0552-PMDZ on Raspberry PI and on ADICUP3029.

===== General Setup Using ADICUP3029 =====

The ** EVAL-CN0552-PMDZ ** can be used with [[/resources/eval/user-guides/eval-adicup3029|ADICUP3029]].
Here is a video on how to use the CN0552 with the ADICUP3029:

<WRAP center round box 60%>
{{youtube>6yjW-1EjQ0I}}
</WRAP>

==== Demo Requirements ====

The following is the list of items needed in order to replicate this demo.

  * ** Hardware **
    * [[ADI>EVAL-ADICUP3029|EVAL-ADICUP3029]]
    * [[ADI>CN0552|EVAL-CN0552-PMDZ]] 
    * Two 2pF ceramic capacitors
    * Micro-USB to USB Cable
    * PC or Laptop with USB Port

  * ** Software **

There are two basic ways to program the ADICUP3029 with the software for the CN0552.
  - Dragging and Dropping the .Hex to the Daplink drive
  - Building, Compiling, and Debugging using CCES\\

\\
Using the drag and drop method, the software is going to be a version that Analog Devices creates for testing and evaluation purposes.  This is the EASIEST way to get started with the reference design.

Importing the project into CrossCore is going to allow you to change parameters and customize the software to fit your needs, but will be a bit more advanced and will require you to download the CrossCore toolchain.

The software for the **ADICUP3029_CN0552** demo can be found here:

<WRAP round 80% download>
Prebuilt CN0552 Hex File
  * [[repo>no-OS/releases/download/last_commit/cn0552.zip|ADuCM3029_demo_cn0552.hex]]

Complete CN0552 Source Files
  * [[https://github.com/analogdevicesinc/no-OS/tree/master/projects/cn0552 | ADuCM3029_demo_cn0552 Source Code]] 

</WRAP>

To build the project from the source, follow the instructions in the [[https://github.com/analogdevicesinc/no-OS/wiki|no-os wiki]].

==== Setting up the Hardware ====
  - Connect **EVAL-CN0552-PMDZ** board at connector **P9** of the **EVAL-ADICUP3029**. 
  - Connect a micro-USB cable to the P10 connector of the EVAL-ADICUP3029 and connect it to a computer. The final setup should look similar to the picture below. {{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:pmod-toadicup.png?900 }} <wrap center 22%> //<fc>Figure 5. Hardware Setup</fc>// </wrap>
  - Make sure the following switches are as shown from the table below. {{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:switch_config.png?900 }} <wrap center 30%>
//<fc>Figure 6. Switch Confuguration</fc>//
</wrap>
  - From your PC, open My Computer and look for the DAPLINK drive, if you see this then the drivers are complete and correct. {{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:daplink.jpg?300 | }} <wrap center 20%>
//<fc>Figure 7. DAPLINK Drive</fc>//
</wrap>
  - Simply extract the provided zip file. Once extracted, you will see the pre-built hex file for the CN0552 demo. Then drag and drop this Hex file to the DAPLINK drive and your ADICUP3029 board will be programmed. The DS2 (red) LED will blink rapidly.
  - The DS2 will stop blinking and will stay ON once the programming is done.
  - For demo purposes, place a 2 pF capacitor between the EXCA pin and the CIN1(+) pin on the PMOD board. This will be your first channel. Then, place another 2 pF capacitor between EXCB pin and the CIN2(+) pin on the PMOD board. This will be your second channel.

===== General Setup Using Raspberry Pi =====

The ** EVAL-CN0552-PMDZ ** can be used with a Raspberry Pi.

==== Demo Requirements ====

The following is a list of items needed in order to replicate this demo.
  * **Hardware**
    * [[ADI>CN0552|EVAL-CN0552-PMDZ]]
    * [[ADI>PMD-RPI-INTZ|PMOD to Raspberry Pi Adapter (PMD-RPI-INTZ)]]
    * Raspberry PI Zero, Zero W, 3B+, or 4
    * 16GB (or larger) Class 10 (or faster) micro-SD card
    * 5Vdc, 2.5A power supply with micro USB connector (USB-C power supply for Raspberry Pi 4)
    * User interface setup (choose one):
      * HDMI monitor, keyboard, mouse plugged directly into Raspberry Pi
      * Host Windows/Linux/Mac computer on the same network as Raspberry Pi

  * **Software**
    * [[:resources:tools-software:linux-software:kuiper-linux |Kuiper Images]]

==== Loading Image on SD Card ====

In order to control the **EVAL-CN0552-PMDZ** from the Raspberry Pi, you will need to install ADI Kuiper Linux on an SD card. Complete instructions, including where to download the SD card image, how to write it to the SD card, and how to configure the system are provided at **[[:resources:tools-software:linux-software:kuiper-linux |Kuiper Linux]]**.
\\
\\
Write the image and follow the system configuration procedure.

==== Configuring the SD Card ====
Follow the Hardware Configuration procedure under **Preparing the Image: Raspberry Pi** in the [[:resources:tools-software:linux-software:kuiper-linux |Kuiper Images]] page, substituting the following lines in **config.txt**:

<code>
dtoverlay=rpi-cn0552
</code>

==== Setting up the Hardware ====
To set up the circuit for evaluation, consider the following steps:
  - Connect the P9 of the **PMOD to Raspberry Pi Interposer** board at the male header GPIO pin connector of the **Raspberry Pi** as shown below. {{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:interposer.png?500 | }}
  - Connect the ** [[ADI>CN0552|EVAL-CN0552-PMDZ]] ** on the PMOD to Raspberry Pi Interposer board either via Port P3 or P4. {{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:pmod-interposer.png?300 | }}
  - Burn the SD card with the proper ADI Kuiper Linux image. Insert the burned SD card on the designated slot on the RPi.
  - Connect the system to a monitor using an HDMI cable through the mini HDMI connector on the RPi.
  - Connect a USB keyboard and mouse to the RPi through the USB ports.
  - Power on the RPi board by plugging in a 5V power supply with a micro-USB connector. The final setup should look similar to the picture below.
  {{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:overall_setup.png?600 | }}
  
===== Software (both ADICUP3029 and Raspberry Pi) =====

==== Connection ====
To be able to connect your device, the software must be able to create a context. The context creation in the software depends on the backend used to connect to the device as well as the platform where the EVAL-CN0552-PMDZ is attached. Two platforms are currently supported for the CN0552: Raspberry Pi using the ADI Kuiper Linux and the ADICUP3029 running the no-OS AD7746 demo project. The user needs to supply a URI which will be used in the context creation.
\\

The Libiio is a library for interfacing with IIO devices.

<WRAP center round download 60%>
Install the [[https://github.com/analogdevicesinc/libiio/releases|Libiio package]] on your machine. 
</WRAP>

The [[/resources/tools-software/linux-software/libiio/iio_info|iio_info]] command is a part of the libIIO package that reports all IIO attributes. 

Upon installation, simply enter the command on the terminal command line to access it.
\\
=== For RPI Direct Local Access: ===
<code>
iio_info
</code>

\\

=== For Windows machine connected to Raspberry Pi: ===
<code>
iio_info -u ip:<ip address of your ip>
</code>
Example:
      * If your Raspberry Pi has the IP address 192.168.1.7, you have to use //iio_info -u ip::192.168.1.7// as your URI
<note>
Do note that the Windows machine and the RPI board should be connected to the same network in order for the machine to detect the device.
</note>
=== For Windows machine connected to ADICUP3029: ===
<code>
iio_info -u serial:<serial port>
</code>
Examples:
      * In a Windows machine, you can check the port of your ADICUP3029 via Device Manager in the Ports (COM & LPT) section. If your device is in COM4, you have to use //iio_info -u serial:COM4// as your URI.
      * In a Unix-based machine, you will see it under the /dev/ directory in this format "ttyUSBn", where n is a number depending on how many serial USB devices attached. If you see that your device is ttyUSB0, you have to use serial:/dev/ttyUSB0 as your URI.

==== IIO Commands ====

There are different commands that can be used to manage the device being used. The [[/resources/tools-software/linux-software/libiio/iio_attr|iio_attr]] command reads and writes IIO attributes.

<code>
analog@analog:~$ iio_attr [OPTION]...
</code>
Example:
      * To look at the context attributes, enter this code on the terminal:

<code>
analog@analog:~$ iio_attr -a -C
</code>

\\

The [[/resources/tools-software/linux-software/libiio/iio_reg|iio_reg]] command reads or writes SPI or I2C registers in an IIO device. This is generally not needed for end applications, but can be useful in debugging drivers. Note that you need to specify a context using the //-u// qualifier when you are not directly accessing the device via RPI or when you are using the ADICUP3029 platform.

<code>
analog@analog:~$ iio_reg -u <context> <device> <register> [<value>]
</code>

Example:
      * To to read the device ID (register = 0x02) of an AD7746 interfaced via RPI from a Windows machine, enter the following code on the terminal:

<code>
iio_reg -u ip:<ip address> ad7746 0x02
</code>

\\

==== IIO Oscilloscope ====
<note important>Make sure to download/update to the latest version of IIO-Oscilloscope found on this link[[https://github.com/analogdevicesinc/iio-oscilloscope/releases]]</note>
  - Once done with the installation or an update of the latest IIO-Oscilloscope, open the application.  The user needs to supply a URI which will be used in the context creation of the IIO Oscilloscope and the instructions can be seen from the previous section.
  - Press refresh to display available IIO Devices, once ad7746 appeared, press connect.
{{ resources:eval:user-guides:circuits-from-the-lab:cn0552:osc.png?200 | AD7746 Oscilloscope Configuration}}

=== Debug Panel ===
Below is the Debug panel of AD7746 wherein you can directly access the attributes of the device.
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:debug_panel.png?direct&400 | AD7746 Debug Panel}}


=== DMM Panel ===
Access the DMM panel to see the instantaneous reading of the input capacitances and the device temperature. 
{{ :resources:eval:user-guides:circuits-from-the-lab:cn0552:dmm_readings.png?direct&400 | AD7746 DMM Panel }}


==== PyADI-IIO ====

[[/resources/tools-software/linux-software/pyadi-iio|PyADI-IIO]] is a python abstraction module for ADI hardware with IIO drivers to make them easier to use. This module provides device-specific APIs built on top of the current libIIO python bindings. These interfaces try to match the driver naming as much as possible without the need to understand the complexities of libIIO and IIO.\\

Follow the step-by-step procedure on how to install, configure, and set up PYADI-IIO and install the necessary packages/modules needed by referring to this [[/resources/tools-software/linux-software/pyadi-iio|link]].

=== Running the example ===
After installing and configuring PYADI-IIO in your machine, you are now ready to run python script examples. In our case, run the **ad7746.py** found in the examples folder.

<code> D:\pyadi-iio>python examples/ad7746.py </code>

Press enter and you will get these readings.

{{:resources:eval:user-guides:circuits-from-the-lab:cn0552:python_script.png?500}}

===== Schematic, PCB Layout, Bill of Materials =====

<WRAP round 80% download>

[[adi>cn0552-DesignSupport|EVAL-CN0552-PMDZ Design & Integration Files]]
  * Schematic
  * PCB Layout
  * Bill of Materials
  * Allegro Project
</WRAP>

===== Additional Information and Useful Links =====

  * [[ADI>AD7746|AD7746 Product Page]]
  * [[adi>media/en/technical-documentation/application-notes/AN-1585.pdf | AN-1585 Application Note]]
  

====== Reference Demos & Software ======
  * [[repo>no-OS/wiki|CN0552 No-OS Build Instruction Guide]]
  * [[repo>no-OS/tree/master/projects/cn0552|CN0552 No-OS Device Drivers]]
  * [[:resources:tools-software:linux-software:kuiper-linux |Kuiper Linux]]
  
=====Registration===== 
<WRAP round tip 80% >
Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware.  [[reg>EVAL-CN0552-PMDZ?&v=Rev B|Register]] to receive all these great benefits and more!</WRAP>

// End of Document //
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