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PAC1934 Evaluation Board (ADM00805) User’s Guide

DS50002673A-page 22

 2017 Microchip Technology Inc.

FIGURE 3-6:

RECENT LOG FILE WINDOW

3.3

PAC SETTINGS SECTION

Each input channel of the PAC1934 is internally set for unipolar/unidirectional voltage

on VBUS and unidirectional currents on VSENSE by default. However, in the GUI, all four

channels are configured for bidirectional currents by default. This bidirectional setting

avoids clipping of negative values. For bidirectional currents the VSENSE results are in

16-bit two's complement representation. A drop-down menu allows reconfiguring each

channel or turning it off as shown in Figure 3-7 for channel 4 (1). Using the GUI this way

programs the appropriate register for the selected channel.

FIGURE 3-7:

PAC SETTINGS WINDOW

3.3.1

Alert Settings

The check boxes enable turning on the alert function and selecting which type of con-

ditions can trigger the alert function: Conversion Complete or Accumulator Overflow.

The alert status is also displayed underneath the check boxes, as shown in Figure 3-7

(2).

The GUI is not fast enough to capture the conversion based ALERT, which lasts only

5 μS. The SLOW/ALERT pin must be monitored with a circuit fast enough to detect the

5 μS wide ALERT signal to use this function.

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