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This document presents the steps to setup an environment for using the EVAL-AD5252SDZ evaluation board together with the Xilinx KC705 FPGA board, the Xilinx Embedded Development Kit (EDK) and the Micrium µC-Probe run-time monitoring tool. Below is presented a picture of the EVAL-AD5252SDZ Evaluation Board with the Xilinx KC705 board.
For component evaluation and performance purposes, as opposed to quick prototyping, the user is directed to Analog Devices System Demonstration Platform (SDP). The SDP consists of a:
The EVAL-SDP-CB1Z controller board is part of Analog Devices SDP providing USB 2.0 high-speed connectivity to a PC computer running specific component evaluation software. Each SDP evaluation daughter board includes the necessary installation files needed for this performance testing. It's expected that the analog performance on the two platforms may differ.
Below is presented a picture of SDP-B Controller Board with the EVAL-AD5252SDZ Evaluation Board.
The AD5252 is dual-channel, I2C, nonvolatile memory, digitally controlled potentiometer with 256 positions, respectively. This device performs the same electronic adjustment functions as mechanical potentiometers, trimmers, and variable resistors. The part’s versatile programmability allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment/decrement of resistance, resistance changes in ±6 dB scales, wiper setting readback, and extra EEMEM for storing user-defined information, such as memory data for other components, look-up table, or system identification information.
The EVAL-AD5252SDZ evaluation board is designed to help customers quickly prototype new AD5252 circuits and reduce design time. The EVAL-AD5252SDZ incorporates several test circuits to evaluate the AD5252 performance.
The first objective is to ensure that you have all of the items needed and to install the software tools so that you are ready to create and run the evaluation project.
The following table presents a short description the reference design archive contents.
Folder | Description |
---|---|
Bit | Contains the KC705 configuration file that can be used to program the system for quick evaluation. |
Microblaze | Contains the EDK 13.4 project for the Microblaze softcore that will be implemented in the KC705 FPGA. |
Software | Contains the source files of the software project that will be run by the Microblaze processor. |
uCProbeInterface | Contains the uCProbe interface and the .elf symbols file used by uC-Probe to access data from the Microbalze memory. |
Before connecting the ADI evaluation board to the Xilinx KC705 make sure that the VADJ_FPGA voltage of the KC705 is set to 3.3V. For more details on how to change the setting for VADJ_FPGA visit the Xilinx KC705 product page.
At this point everything is set up and it is possible to start the evaluation of the ADI hardware through the controls in the uC-Probe application provided in the reference design.
Launch uC-Probe from the Start → All Programs → Micrium → uC-Probe.
Select uC-Probe options.
Set target board communication protocol as RS-232
Setup RS-232 communication settings
The following figure presents the uC-Probe interface that can be used for monitoring and controlling the operation of the EVAL-AD5252SDZ evaluation board.
Section A is used to activate the board and monitor activity. The communication with the board is activated / deactivated by toggling the ON/OFF switch. The Activity LED turns green when the communication is active. If the ON/OFF switch is set to ON and the Activity LED is BLACK it means that there is a communication problem with the board. See the Troubleshooting section for indications on how to fix the communication problems.
Section B is used to update the RDAC registers. The RDAC registers can be updated by selecting a desirable value on the slider and clicking Load RDACx.
Section C is used to read/write data from/into memory block. The location can be chosen from the EEMEM slider. Each location can be read, or updated with the value from the second slider.
Section D is used to display the stored tolerance of each internal resistor.
Section E is used to send two bytes to the AD5252 circuit. A customized I2C data-word can be sent by manually switching the buttons from 0 to 1 or from 1 to 0 as desired and then clicking Send Data.
Section F is used to enable or disable the AD5252 WP pin.
Section G is used to send the AD5252 quick commands directly to the AD5252.
In case there is a communication problem with the board the follwing actions can be perfomed in order to try to fix the issues: