Hi,
I made mesures with a CH9340 I have got
It outputs a HIGH level (5v in my case) for both the DTR# and RTS# , and the same for both USB connected or unconnected
so I assume that these pins are normally at HIGH level, and only at LOW level when connected & activated by the PC, and this must be true for all the CH340 series
right ? thanks !
Did you mean to say "must be true for all of the CH9xxx series"
no, CH430 series
I have a project with a CH340E, but I will directly make a PCB, before doing any mesure
so I need to be sure of its behaviour before designing the PCB
I have currently no CH340 nor CH340E, so I can't mesure it
but I now they are present, mostly in somme clones or USB to serial converters, so it might be easy for some people to do the mesures
(I have no knowledge about CH9340, unless I have got one on a nano clone)
But then you say you have no knowledge of CH9340. I'm confused.
There is no CH430. Did you mean CH340?
The CH340E does NOT have DTR!
CH430 was a typo, I wanted to say CH340
right, CH340E has no DTR, but I assume RTS# and DTR# pins have the same behaviour, so any information about the DTR# pin would be interesting too
In the case of connecting an Arduino to USB using a CH340E, the RTS pin can be used in the same way as the DTR PIN, to reset the Arduino.
Connect as below
I just broke out CTS to pad just in case I needed it for something. You can keep it as no connect. I can confirm that this works for an ATmega 2560 chip.
Hi Nycticoraci
ok thanks , sure you will make lot of amazing tasks with the CTS pin !
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