EVAL-AD7156EBZ Analog Devices Inc, EVAL-AD7156EBZ Datasheet - Page 5

• Manufacturer Part Number: EVAL-AD7156EBZ
• Description: Evaluation Board I.c.
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7156EBZ

• Sensor Type: Touch, Capacitive
• Interface: I²C
• Voltage - Supply: 1.8 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: AD7156
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

EVALUATION BOARD SOFTWARE
STARTING THE EVALUATION SOFTWARE
Start the AD7156 evaluation software on the PC.
Click the Start button, located at the bottom left-hand corner
of your desktop. Select Programs, then Analog Devices, then
AD7156 Evaluation Software, and then AD7156EB to run the
software.
If a connection between the software and the evaluation board
is correctly established, the window shown in Figure 9 appears.
The USB indicator in the top right corner of the software window
turns on green, and the LED labeled RUN on the AD7156
evaluation board flashes in approximately 1 sec intervals.
DATA ACQUISITION WINDOW
Reset
When Reset is clicked, the software accesses AD7156 Register
Address 0xBF to reset the part. See the AD7156 data sheet for
details on the serial interface.
Demo Setup
Clicking on Demo Setup configures the AD7156 to its default
settings, as shown in Figure 10.
Setup
Click Setup to open the AD7156 setup window (see Figure 10),
which provides access to the AD7156 settings.
Log Data to File
When Log data to file is clicked, the software allows you to log
the acquisition data into a text file with the ASCII tab character
as the delimiter to allow easy import to a data processing tool,
such as Microsoft® Excel.
Figure 9. AD7156 Evaluation Software Data Acquisition Window
Rev. 0 | Page 5 of 16
Start Acquisition
Clicking the green Start Acquisition button in the AD7156
evaluation software window starts the data acquisition. The LED
labeled RUN on the evaluation board turns on, the RUN indicator
in the top right corner of the software window turns on red, and
graphs in the software start displaying the measured data.
The data displays and the traces in the graphs represent real-
time data read from the AD7156.
Graphs
The graphs show the history of data of up to 65,536 samples.
You can modify the graph appearance. For example, the scale
can be modified by typing minimum and maximum numbers
when the autoscale is turned off. Place the cursor on the graph
and right-click the mouse to open the graph submenu, which
allows different individual graph settings.
When Clear Graphs is clicked, the graph and the graph history
are cleared.
Data Format and Units
Both displays show the data as hexadecimal codes read from the
AD7156 and translated to picofarads (pF). The graphs can show
the data in either hexadecimal codes or translated in picofarads.
To switch between these two modes, click Display pF. The
Display pF button switches to Display Code when clicked.
EVAL-AD7156