Yes you are right . but with insulating barrier that protects what is behind it>an optocoupler is no proteciton device. It is an isolato
indeed the schmitt trigger gives no additional protection. It just forms clean edges.I like the 74LVS1G14 solution, it's nice and robust, but it takes up a lot of space on the PCB .
I use any as this detail wiring and arrangement on the PCBon the other hand one still needs to be careful with part selection and wiring.
primarily not, on the other hand it has 74LVC1G14 is compliant with the AEC-Q100. ie it hasindeed the schmitt trigger gives no additional protection
In my opinion, the output should be so durable that if the user connects the supply voltage to the output, he survives until it comes to--> 10k value is questionable
Yes it is.--> use of LVC14 is questionable
My opinion is different.In my opinion, the output should be so durable that if the user connects the supply voltage to the output, he survives until it comes to
For exmple if we have 24V as PS and use 1k ohm resistor 1206 current through it at 24V will thermally destroy it , 10k 10k survives, yes 10k resistance also limits current out . a reasonable compromise needs to be found
If the LVC14 is destroyed ... something seriously went wrong.it's another separation barrier, if it is destroyed there is hope that the MCU will survive, I think
On which side is the 3.3V MCU? The input side? so where comes the 5V?+ can serve as a level shiter to TTL +5 for a 3.3V MCU
5V ouputs are protected against 0V/5V short circuit, but not against much higher voltage. Not 24V.
This is more than 5 times the nominal voltage.I can't help but if the power supply is + 5V from the adapter the input should be resistant to + 14V (16 absolute max), because the adapter marked + 5V may be unloaded, if I use unstabilized to give more, and as a solid manufacturer I should count on user inattention and the most common are + 12V adapters.
The HDD has a relatively specific connector for power supply and it is almost impossible to have a connector that can be plugged into it and has different power levels.o you think that every 5V HDD, or SDD or any 5V USB powered device can handle 14V?
Of course, there was a note about the tightening torque somewhere in the manual, but the manuals don't read and I wouldn't read them either, and I probably even wrote it.Your (American) torque example:
first of all I need to say that all I write here is "how I see the things". No need for other to do it the same way.I have on terminal block +24V , used for actuators such as valves may be external relays etc., for switchung use any as darlingtor array ULN2003L.
We were looking for a replacement and find for example L9823 , this have SPI, overcurrent and overtemperture protection, butYou say ULN2003.
I don´t like them.
Why a separate SPI?What do you mean with "killing one SPI"?
Inside the L9823, in addition to RdsON, there are two other resistors for current measurement.- RdSOn 1 Ohn , it warmed up similarly to 2003 ..
I see it is about 1.4V @ 500mA which means 2.8 Ohms.
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