[From QnA] WIZ220IO Pin Definitions

Question

This post came from QnA of WIZnet website I’m embedding a WIZ220 module into another product, and have a few questions: Can these boards be modified to run on 3.3V instead of 5V (i.e. bypass the on-board LDO)? I see some products have a version without an RJ45 and magnetics. I would prefer to AC couple the PHY output directly into an unmanaged Ethernet switch, and avoid the magnetics. Is there a version of the 220 with direct PHY output? If not, can the 220 be ordered with the RJ45 unpopulated? What is the purpose of the F_RST pin? Under what conditions would we need the ability to pull this pin low? I see no definition for the P2_2 or P2_4 pins. They’re unconnected on your base board. What are they? Thanks, Gary

irina · Answer

Dear customer, Thanks for your interest in WIZ220IO. I answer you about your question. You can use power 3.3V instead of 5V. However, it is necessary to supply a stable voltage for the 3.3V, when the unstable power is supplied to the chip , it may break the chip. There is no version that can be used without RJ45. F_RST pin is used to the Factory reset. I used directly to pin that is not currently in use. Thanks, WIZnet