Analog Devices ADN8810 Application Note page 3

Figure 2. ADN8810EVB Controller Main Window
Mode Settings
The Mode Settings section of the main interface window
is composed of the components shown in Figure 3. In
this section, users can change the full-scale output cur-
rent by modifying the sense resistor value, R
board comes with 1.6  RS1 and RS2 resistors. For more
information on changing the full-scale output current, see
the Adjusting Maximum Output Current section.
In addition to setting the R
area of the ADN8810EVB Controller allows you to toggle
Shutdown, Reset, and Comp Enable. For more details on
internal compensation of the ADN8810, see the ADN8810
Data Sheet.
Figure 3. Mode Settings Section
Device Selection
The Device Selector section consists of eight radio buttons
labeled Device1 to Device8. The default selection for the
ADN8810EVB Controller is Device1, which has a binary
address of 0000. To select a different device to program,
simply select another radio button by left clicking the
desired device. Note that although the binary address
of the device is four bits long, only eight different device
addresses can be used, so the highest binary address, 0111,
corresponds to Device8.
Figure 4. Device Selector Section
REV. 0
.The demo
SN
value, the Mode Settings
SN
Output Current Selection
The Slider and Edit box components in this section
of the main interface window provide two ways
to modify the output current level of an ADN8810
device. By moving the slider or typing an output current
value in the edit box, the ADN8810EVB Controller
will calculate the proper DAC bit code to send to the
selected ADN8810 device address. Changing the slider
position will result in a modified display value in the Edit
box and vice versa.
Figure 5. Output Current Selector Section
Control Buttons
The Control Buttons section of the ADN8810EVB Control-
ler main application window are Send, Details, and Exit.
The selected device will not be programmed with the
output current selection (Edit box value) until the Send
button is clicked.
Clicking the Details button launches a Bit-Code Details
window similar to the one in Figure 6. This window has
three bit codes. The first (top) bit code is the complete
code sent via the SPI interface to the ADN8810 device.
The second and third bit codes are simply the address
bits and the code used to program the internal DAC of the
ADN8810, respectively.This window is provided so users
of the evaluation software and demo board can easily
write applications to program a desired current output to
the ADN8810 device in their applications.
Figure 6. Details Dialog Window
The Exit button simply closes the ADN8810EVB Control-
ler. Exiting the ADN8810EVB Controller does not put the
ADN8810 device(s) into shutdown or reset mode. As long
as power is provided to the demo board(s), the ADN8810
device(s) will retain its output current setting.
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AN-619