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From: "Sarin Sukumar A" <sarinsukumar@gmail.com>
Sent: Tuesday, July 13, 2010 12:54 PM
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Subject: [PIC]Internal Voltage Boost Assist for USB Bus Voltage Generation

> my circuit uses PIC24FJ256GB110. i wanted to interface a USB flash memory
> stick.
> My PIC working voltage is 3V.
> PIC working as a usb host, so it should give 5V to the USB device.
> I want to use "Internal Voltage Boost Assist for USB Bus Voltage 
> Generation"
> But i didnt get the required information or schematics.
>
> what i understood is
> VCPCON is pwm output, i connected this to a boost circuit. then the output
> is connected to the VBUS.
> but where to connect the VBUSST,VCMPST2 and VCMPST1 pins.
>
> Thanks in advance

Looking at the Family Reference Manual (DS39897C ~page 210), it looks as if 
all the info you need is in there. It has examples of Host/OTG circuits with 
an external charge pump to generate the 5V needed. 


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