Si470x breakout on 5V

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BigPilot
Posts: 26
Joined: Fri Sep 23, 2005 2:04 am

Si470x breakout on 5V

Post by BigPilot » Fri Dec 07, 2018 10:18 am

I noticed that most projects using the Si470x tuner breakout are using 3.3V to drive the board. However, in the Si4702 datasheet I noticed that it can be powered by 5V. Is it safe to use it with a 5V microcontroller such as the Teensy 2.0 (AVR) I'm using?

BigPilot
Posts: 26
Joined: Fri Sep 23, 2005 2:04 am

Re: Si470x breakout on 5V

Post by BigPilot » Sat Dec 08, 2018 12:41 am

Also, the schematic says: '2.7V < VCC < 3.3V', implying that the board cannot be powered by 5V.

BLH
Posts: 11
Joined: Tue May 29, 2018 4:50 am

Re: Si470x breakout on 5V

Post by BLH » Sat Dec 08, 2018 4:49 am

I would say no.
Look at the data sheet again. VD and VA can be 5 volts. The VIO voltage is rated 1.5 to 3.6 volts.
The schematic shows VD,VA and VIO are all on one voltage input connection.

BigPilot
Posts: 26
Joined: Fri Sep 23, 2005 2:04 am

Re: Si470x breakout on 5V

Post by BigPilot » Sat Dec 08, 2018 6:49 am

Yeah, you're right. VIO has an absolute maximum rating of 3.9V.

Luckily, I still have a couple of Sparkfun level converters lying around. ;)

BigPilot
Posts: 26
Joined: Fri Sep 23, 2005 2:04 am

Re: Si470x breakout on 5V

Post by BigPilot » Sat Dec 08, 2018 8:37 am

:idea: BTW thanks for helping out!

BigPilot
Posts: 26
Joined: Fri Sep 23, 2005 2:04 am

Re: Si470x breakout on 5V

Post by BigPilot » Sun Dec 09, 2018 10:39 pm

I noticed https://www.sparkfun.com/products/13314 temperature sensor works on 3.3V but it says:
2C communication uses an open drain signaling, so there is no need to use level shifting.

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