Microchip Technology PAC1921, Руководство пользователя

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PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide
DS50002376A-page 30
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2015 Microchip Technology Inc.
To restart the communication between the software and the evaluation board, click the
Run button. The arrow button disappears when the communications resume.
To close the program, use the Close (X) button in the upper right corner of the window.
4.2.1.2 SMBus ADDRESS
The “SMBus Address” box, shown in Figure 4-5 , indicates the selected SMBus
address. The SMBus address can be changed by moving a jumper (see
Section 3.3.1 “SMBus Mode” ).
FIGURE 4-5: SMBus Address Indicator.
4.2.1.3 COM STATUS INDICATOR
The “COM” status indicator, on the right side of the panel as shown in Figure 4-5 ,
indicates the status of communications over the SMBus. During normal operation, the
“COM” indicator is black. If the SMBus communications fail, the “COM” indicator turns
red.
4.2.1.4 SINGLE READ/CONTINUOUS READ
The panel defaults to continuous register reads (toggle switch in down position, as
shown in
Figure 4-5 ). To stop continuous register reads, check the “Enable Single
Read” box. In order to capture the register values at a given time, click the switch, which
will briefly flip to “Single Read”.
4.2.1.5 REGISTER CONTENT
“Reg Content”, shown in Figure 4-3 , is a scrollable list of the PAC1921 registers and
the last read value. It is important to note that not all addresses are physical memory
locations on the device; these registers will read ‘
0
’. Likewise, some registers shown
(undocumented in the data sheet) may have data. Editing these registers can cause
unexpected results.
To update a register value, locate the register address in the left column, type the new
value in the corresponding cell in the right column, and press
Enter on the keyboard or
click on another part of the GUI.
Note 1: Stopping and restarting the GUI does not affect register settings. To
restore default register settings, disconnect power from the evaluation
board, then reconnect power.
2: Stopping the GUI clears the “Enable DC Vsense- Stimulus” box (see
Section 4.2.6 “EVB Demo Configuration Panel” ).
SMBus
Address
Indicator
COM Status
Indicator
Single Read
Button