Electronics > Projects, Designs, and Technical Stuff
STM32 blinking 30 LED's!
Jeroen3:
Technically it still leaks into the input schmitt trigger. It should be possible to disable this as well by setting it to analog. But what are you even doing when this is relevant!?
Anyway, this circuit definitely violates the 150mA Vdd absolute maximum.
Berni:
MCUs don't have a true tristate?
I really don't get it. On pretty much any MCU when you put a pin into tristate mode and then write anything you want to it you can't see the pin do anything on the outside, it just floats freely. As for pullups or pulldowns, they can be turned on or off at will.
So how about open collector output mode then? Are they also fake open collector outputs, because the transistor for pulling it up still exists inside the chip but is never turned on?
Yansi:
--- Quote from: Jeroen3 on September 03, 2019, 11:25:05 am ---Technically it still leaks into the input schmitt trigger. It should be possible to disable this as well by setting it to analog. But what are you even doing when this is relevant!?
Anyway, this circuit definitely violates the 150mA Vdd absolute maximum.
--- End quote ---
And then i will leak to the analog interface circuitry. ;D
It violates more than that. But in a thread, where there is lack of basic understanding, what a Hi-Z state is and how it is achieved, this probably does not matter much.
Yansi:
Jeroen3:
Maximum 1 uA leakage current (in or out) is pretty close to Tri-State if you ask me.
Even though it may or may not be the textbook Tri-State in the silicon.
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