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Topic: Hi, new to arduino. Question on TTL-232R-3V3 (Read 591 times) previous topic - next topic

madworm

It doesn't matter if you power the mini with 3.3V or 5V on the Vcc pin (with said cable). The ATmega chip can deal with it.

It does matter if you have other devices connected to Vcc as well. If they are strictly 3.3V, you will blow them up. With that in mind, it would have been wise to route the Vcc pin through the regulator as well. Ultra low drop regulators would only take away maybe 0.1V or less at small loads.

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Texy


Does the FTDI have a solder jumper to cut or install to select 3.3V or 5V out?

No it's the usual sealed USB connector type.
Texy

Texy


It does matter if you have other devices connected to Vcc as well. If they are strictly 3.3V, you will blow them up. With that in mind, it would have been wise to route the Vcc pin through the regulator as well. Ultra low drop regulators would only take away maybe 0.1V or less at small loads.



Exactly my issue - I chose the 3v3 type because the arduino needs to connect to a 3v3 device. I will need to be careful whilst I am using the USB serial link.
Thanks people.
Texy

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