Pull up/down resistor on I/O pin of EZ-USB (AN21xx/FX/FX1/FX2/FX2LP)

Question: The I/O pins of EZ-USB (AN21xx/FX/FX1/FX2/FX2LP) are configured as input when the device starts. I need to keep the I/O pin(s) in a known state. Can I connect a pull-up or pull-down resistor to the I/O pin(s)?

 

Answer:

Yes. Pull-up/down resistor can be used. In applications like this the point to keep in mind is the selection of the pull-up/down resistor such that the maximum rating of the pin is not exceeded. One more thing to keep in mind is that powering the pin before powering the device is not recommended.