-------------------------------------------------- From: "Sarin Sukumar A" Sent: Tuesday, July 13, 2010 5:38 PM To: "Microcontroller discussion list - Public." Subject: Re: [PIC]Internal Voltage Boost Assist for USB Bus Voltage Generation >> >> >> >> 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. >> >> I have read that portion. there it says you can generate by the help of > internal boost assistance. But they are not providing any schematics or > any > information about hardware connections. I have referred the family > reference > manual also. But didnt find any info.. > If any one know about this please replay. Ok sorry, I wasn't sure if you had read it from your first message, so I thought that may have been what you were looking for at first glance. Looking more closely, it doesn't seem to be dealt with very thoroughly in the manual. As Bob says, getting what info you can from the demo board schematics, and/or designing a small boost circuit based around the PWM frequency seem like a good way to go. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist