8
http://www.national.com
5.0 Software Operation and Settings
The WaveVision4 software is included with the
WaveVision4 board and the latest version can be
downloaded from National's web site at
http://www.national.com/adc. WaveVision4
software version 4.4 or later is required to evaluate
this device with the WV4 system.
To install this software, follow the procedure in the
WaveVision4 Board User's Guide. Once the
software is installed, run it and set it up as follows:
Note: Before continuing, ensure that the
WaveVision Hardware is setup according to
Section 3.2.
1. From the WaveVision main menu, go to
Settings, then Capture Settings to open the
System Settings dialog.
2. Under board type, select WaveVision4 (USB).
3. Turn on the power to both boards, then click
on the
"Reset"
button and await the firmware
download.
After the firmware has
downloaded, WaveVision will open up a
control panel window for the DAC121C08XEB
.
4. Click on the
"Close"
button to close the
System Settings Dialog.
5. Navigate to the DAC121C08XEB Evaluation
Board window.
6. Configure the I
2
C Interface speed as seen in
Figure 7
. Standard mode, Fast Mode, and
High Speed mode are supported.
Figure 7: I
2
C Speed Select
7. Configure the I
2
C address of the DAC. The
DAC121C085 will respond to I
2
C address
0x0C by default with pins A0 and A1 floating
(no jumpers on JP5). Change the I
2
C slave
address of the DAC by adding jumpers to JP5.
Refer to
Table 1
for a detailed description of
the I
2
C address settings. The address in
Figure 8
must match the address configured
by A0 and A1.
NOTE:
Jumper Setting changes to the pin-
configured slave address will not take effect
until the DAC is power-cycled.
Figure 8: I
2
C Address
8. Perform register level control of the DAC by
writing 16-bit words to the DAC Data Register.
To write the DAC, simply type a 16-bit hex
value into the “Manual DAC Control” field and
press Enter or click the “Write DAC Register”
button. See
Figure 9
.
Figure 9: Manual DAC Control
9. To put the DAC into power-down mode, select
a power-down option from the “Power-down
Mode” box and click the “Set Mode” button.
Figure 10: DAC Power-down Control
