Hi,
I want to understand the use (need) of ESD protection diodes.
I have a small sensor board located a few metres from a main board, it operates at 5V. So i have a +V, 0V and a signal. The signal carries simple serial data between two microcontrollers. (just every now and again)
I have already used a diode array, but my question is:-
1, Why do these devices exist in unidirectional mode - if transients could be both positive and negative on any line relative to any other line, is it not better to use a bi directional all the time?
2, What effect does choosing asymmetrical or symmetrical have on the actual funtion - i can see that in asymmetrical direction you have the breakdown voltage, in the other you have the forward voltage, and in symmetrical both are the same, based on breakdown.
3, I have used the device GSOT-05C, this is confusing becuase the datasheet describes using all three pins for a two line protection (bi directional asymmetrical mode) or using two pins for a one line protection (bi directional symmetyrical mode) - can anyone help with this?
Is this device really going to help much with potential pickup on the cable from things turning on and off....
Any guidence would be appreciated.
Thanks
I want to understand the use (need) of ESD protection diodes.
I have a small sensor board located a few metres from a main board, it operates at 5V. So i have a +V, 0V and a signal. The signal carries simple serial data between two microcontrollers. (just every now and again)
I have already used a diode array, but my question is:-
1, Why do these devices exist in unidirectional mode - if transients could be both positive and negative on any line relative to any other line, is it not better to use a bi directional all the time?
2, What effect does choosing asymmetrical or symmetrical have on the actual funtion - i can see that in asymmetrical direction you have the breakdown voltage, in the other you have the forward voltage, and in symmetrical both are the same, based on breakdown.
3, I have used the device GSOT-05C, this is confusing becuase the datasheet describes using all three pins for a two line protection (bi directional asymmetrical mode) or using two pins for a one line protection (bi directional symmetyrical mode) - can anyone help with this?
Is this device really going to help much with potential pickup on the cable from things turning on and off....
Any guidence would be appreciated.
Thanks