External pull-up for FX1/FX2LP
Anonymous
Not applicable
Jul 02, 2011
09:56 PM
- Subscribe to RSS Feed
- Mark as New
- Mark as Read
- Bookmark
- Subscribe
- Printer Friendly Page
- Report Inappropriate Content
Jul 02, 2011
09:56 PM
Question: When the FX1 is operated from 3.3V Vcc, can an output port be pulled to +5V using an external pullup?
Answer:
Yes, the output port can be pulled to +5V using an external pullup. For this, you need to configure your EZ-USB I/O pins as open-collector outputs with pullup resistors to 5V. To make a pin act as an open-collector output, set the appropriate OUTx bit to 0, then toggle the corresponding OEx bit to switch the pin between low (output) and high-impedance (input) states.
Rate this article:
Contributors
-
This widget could not be displayed.Anonymous