PAC1921 datasheet(30/56 Pages) MICROCHIP

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PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide

DS50002376A-page 30

 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

“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

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