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USB Current Draw Requirements
FIGURE B-2:
FIGURE B-3:
VARYING PWM OUTPUT TO SLOWLY CROSS THE LINEAR
REGION OF Q1’S OUTPUT
THE ENTIRE SOFT START PROCESS
B.3
SOFT START FUNCTIONS AND USAGE
A software component on the microcontroller side is also required to manage the PWM
output and control the external circuit. The demo applications supplied with the starter
kit use three different software function calls to manage USB-related power consump-
tion.This section describes the functions provided and how they are used to meet the
USB requirements.
B.3.1
AppPowerEnable()
The AppPowerEnable() function starts the soft start sequence. The function initial-
izes the port pins, timers and PWM modules to get ready for the soft start. It is optional
if APP_POWER_AUTO_ENABLE is defined.
In light of the Total Application Current Draw specification of 100 mA, this function
should not be called until after the device is enumerated. See the following section for
more details.
? 2009 Microchip Technology Inc.
DS51852A-page 35
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