Coper
Member level 4
I am designing a device that has an external connector connected ,+24V, +5V, GND and several digital input.
for simplicity, I used an optocoupler in the digital inputs, although it is not a fully isolated solution
see picture S1 is out of device , and it can be anything
For ESD protection, I added ESD protection diodes PESD5V0S2U .
Because there is also + 24V on the same connector and the manuals are not read, it is only a matter of time when someone connects + 24V to this input.
The current is conducted by PESD5V0S2U, but nowhere can I find what is the maximum constant current that this ESD diode can conduct permanently?
Alternatively, how better to design the protection of the digital input, or the entire input?
On R2 is ARM MCU GPIO
for simplicity, I used an optocoupler in the digital inputs, although it is not a fully isolated solution
see picture S1 is out of device , and it can be anything
For ESD protection, I added ESD protection diodes PESD5V0S2U .
Because there is also + 24V on the same connector and the manuals are not read, it is only a matter of time when someone connects + 24V to this input.
The current is conducted by PESD5V0S2U, but nowhere can I find what is the maximum constant current that this ESD diode can conduct permanently?
Alternatively, how better to design the protection of the digital input, or the entire input?
On R2 is ARM MCU GPIO