PAC1921 datasheet(39/56 Pages) MICROCHIP

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Software Description

 2015 Microchip Technology Inc.

DS50002376A-page 39

4.4

EVALUATION BOARD EXAMPLES

4.4.1

Power Pin-Controlled Integration Example

This example provides steps to experiment with pin-controlled integration in SMBus

mode and see the effects of gain.

1. In the Main Configuration section, check the “READ/INT OVR” box. This allows

the INT_EN bit to override the READ/INT pin state. Also check the “Enable Auto

INT_EN” control to set automatic GUI updates.

2. In the Panel and Integration Control section, check the “Integration Time GUI

Controlled” box, and set the “Read Period (ms)” to 500 ms. This causes the

INT_EN bit to toggle between high for 500 ms (putting the PAC1921 in the

Integrate state) and low for 500 ms (putting the device in the Read state).

3. In the EVB Demo Configuration section, check the “Enable DC Vsense-

Stimulus” box and type 40 mV in the “DC Vsense- Stimulus (mV)” box.

4. Observe the plots on the Vbus & Vsense tab, as shown in Figure 4-18. The

evaluation board demo VBUS is ~5.1V and VSENSE is ~0.04V.

FIGURE 4-18:

Pin-Controlled Integration, No Gain.

Check the “READ/INT OVR” Box

Check the “Enable Auto INT_EN” Control

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