---
title: "Wizfi communication"
url: "https://maker.wiznet.io/forum/11227"
markdown_url: "https://maker.wiznet.io/forum/11227/md"
type: "Forum topic"
category: "Wireless"
author: "soellicha"
created: "2015-08-13T19:04:32+09:00"
last_activity: "2017-05-04T08:36:36+09:00"
language: "en"
views: 467
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# Wizfi communication

## Question

Asked by soellicha on 2015-08-13 in Wireless.

Hello,

1. If I want to connect an MCU with Wizfi250 via SPI, should I use 3.3v voltage regulator or the pin are 5v tolerant?

2. In case of UART connection and I want to use RTC/CTS, are those as well 3.3v?

Thank you,

Best Regards,

Andreas Achilleos

## Replies

### Reply 1 by wizdaniel, 2015-08-17

Hi Andreas Achilleos.

As you know, In all situations that were considered, you have to use 3.3v.

Thanks.

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Source: https://maker.wiznet.io/forum/11227