Timeline for How to safely connect a 1.8v push-pull output to a 3v MCU input?
Current License: CC BY-SA 3.0
5 events
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| Jan 23, 2015 at 21:51 | comment | added | Justin Trzeciak | A level shifter would make sure the voltages stay safe, but not the current. If one end is high, and the other is low, you'll get some current flowing. The circuit I'm thinking of assumes one end is high-z. Or at least an open-drain output. Check out this post for a good reference: electronics.stackexchange.com/questions/18457/…. To protect against current, some resistors in series should still work. Just be mindful how much current each device can source and sink. | |
| Jan 23, 2015 at 17:47 | vote | accept | Mark Hardy | ||
| Jan 23, 2015 at 17:04 | comment | added | Mark Hardy | Thanks Justin, looks like a simple neat solution. I'm curious, now that you mentioned that, would a MOSFET level shifter keep the gauge safe as well? | |
| Jan 23, 2015 at 16:42 | history | edited | Justin Trzeciak | CC BY-SA 3.0 |
Suggested adding second resistor.
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| Jan 23, 2015 at 16:29 | history | answered | Justin Trzeciak | CC BY-SA 3.0 |