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3.3V to 12V bidirectional Logic level shifter
Anik , 08-03-2024, 10:09 PM
I am working on a project which I need to translate 3.3V UART to 12V UART signal or vise versa. I am not sure the attached image on will work or not. I have researched a lot on online but have not found proper information about this.
Anik , 08-03-2024, 10:10 PM
Sorry its not necessary to be bidirectional but need to maintain the direction of RX and TX. But if it possible to make bidirectional it willbe better.
Mini , 08-03-2024, 11:26 PM
Yes this schematic should work. Whole google is actually full of materials on this topic. But since UART is unidirectional I just recommend to you to use simple voltage divider. Only 2 resistors needed.
Anik , 08-04-2024, 06:22 AM
If I want to use universal on HV side like I want to give 5V and 12V TTL and use a 3.3V zener diode on LV side maybe the side willbe protected and device will work properly.
QDrives , 08-04-2024, 12:19 PM
12V UART??? Do you want to blow things up?
I assume you want a RS232 transceiver:
https://www.digikey.nl/en/products/filter/interface/drivers-receivers-transceivers/710?s=N4IgjCBcoKwOwA4qgMZQGYEMA2BnApgDQgD2UA2iAMwCcCNMADCALrEAOALlCAMqcAnAJYA7AOYgAvsQC0AJmQg0kQQFcipCiBohiMVtJAyqi5Wo1lIlMMxaGZO6Eqjnil6wcmSgA
I assume you want a RS232 transceiver:
https://www.digikey.nl/en/products/filter/interface/drivers-receivers-transceivers/710?s=N4IgjCBcoKwOwA4qgMZQGYEMA2BnApgDQgD2UA2iAMwCcCNMADCALrEAOALlCAMqcAnAJYA7AOYgAvsQC0AJmQg0kQQFcipCiBohiMVtJAyqi5Wo1lIlMMxaGZO6Eqjnil6wcmSgA
Anik , 08-04-2024, 02:22 PM
Actually no. Some china inverter supply 12V level UART, So that its need to shift to 3.3V logic.
QDrives , 08-04-2024, 07:04 PM
You do realize that RS232 is typically 12V (or -12V depending on the state)?
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