Application Note 1811
4
April 16, 2013
AN1811.0
• Threshold and Auxiliary Controls
- Pressing the Alert button invokes an Auxiliary Control dialog
box. The dialog box allows the user to configure the threshold
detectors of the DPM chip as well as force a power-on reset.
Figure 6 shows the Auxiliary Controls Dialog Box.
- The Vbus thresholds can be set between 0V and 60V. Vshunt
thresholds range between ±300mV. The Vbus and Vshunt
thresholds do not scale versus BRNG and PGA settings. Once
an input is set and the measured signal violates a threshold
level, the backlight of the measured signal will turn from
yellow to orange for a measured value above the upper
threshold. Measured signals below the lower threshold results
in a backlight changing from
yellow to blue.
- The Reset the Chip to the Default State check box works
independently to the threshold detectors. Checking the box
will reset the chip to the default power-up state. The action
performs an auto calibration on the V
OS
.
• Single Measurement Control
- Pressing the Meas Once button on the main panel measures
the individual channel once that is associated with Meas
Once button.
•Saving Data
- The DPM software allows the user to store a set number of
points of data. Go to the menu bar of the ISL28022 DPM
Demo Software window and choose File --> Save Data.
Choosing the Save Data option will open a dialog box asking
for the filename and directory of the save path. Figure 7 is an
illustration of the dialog box.
The file name entered in the dialog box is the base name for
all files saved. A unique named file is generated for each
measured parameter (Vbus, Vshunt, Current, Power) across 8
channels. The software only saves data to a file for each
measured parameter selected. If a measured parameter is
not selected across 8 channels, then a file with the
non-selected measured parameter is not generated. For
example, power and current files would not be generated for
the configuration of the DPM window shown in Figure 3.
All saved files are tab delimited. The naming convention of
the file is <base name>_<measured parameter>_dataset.
The base name is the file name entered in the save dialog
box. The measured parameter names are vbus, vshunt,
current and power.
-Upon completion of the save dialog box, an input box
(Figure 8) asks for the number of points to be saved per
channel.
Pressing the OK button with a valid numerical entry will begin
data collection. The numerical values change on the main
window while the data is being recorded. The completion of
data collection will commence when all of the active
measurement numbers cease to change.
- The settings of all channels should be finalized prior to
invoking the Save Data feature. The user has the option of
uniquely naming each channel and having the channel name
be passed to the column name of each respective data file.
Changing the field named “Channel Name” in Figure 4 will
change the name of the column data.
FIGURE 6. AUXILIARY CONTROL DIALOG BOX
FIGURE 7. FILE NAME AND DIRECTORY SAVE DIALOG BOX
FIGURE 8. NUMBER OF POINTS PER CHANNEL INPUT BOX
