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Demonstration Software Window
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Demonstration Software Window
The demonstration software enables read and write to LP3972’s internal registers through PC’s USB port.
All the user controllable registers are usable through the software.
Installation: Run the codeloader for LP3972 version .202 or greater.
After startup the user can verify that successful USB communication has been established by selecting
“Read All”, the default programmed voltages should appear.
LDO’s can be enabled and disabled by clicking mouse left button on the square close to each LDO
voltage slider. Changing the virtual slider changes the LDO voltage. After the WRITE button is pressed
subsequent LDO changes are applied if the ‘autowrite’ feature is disabled.
Note ‘Autowrite’ enabled is default. In the case of the buck control, an option for ‘hold’ or ‘go’ can be
selected. Note voltage will not change until the ‘go’ selection is made.
The virtual voltmeters can be activated by selecting ‘Poll Status’, after which an A to D conversion is read
and displayed for each subsequent LDO and Buck output. Note that this feature is meant to be a general
measurement and “may” be subject to variations due to operations noise. Since there is a bi-directional
SDA feature, any register and its contents can be determined by entering the desired register address and
selecting ‘Read’. In addition, any corresponding register may be written directly to via the ‘Store’ selection.
All virtual sliders can be updated via the ‘Read All’ Tab. Direct register control is possible by entering the
desired address and value followed by a ‘Store’ command.
Figure 3. Control Panel
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SNVA235A – May 2007 – Revised April 2013
AN-1621 LP3972 USB Evaluation Board Rev B
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