DP83869HM: current output the DP83869HM

Hi, 

What is the current level you are seeing?

For max current output, please refer to the datasheet's max current output shown in the electrical characteristics section. 

SB said:

If one or more of the data lines in the Ethernet cable is shorted to ground (due to a fault) how does the DP83869HM handle that? 

Is the data line turned off or does the DP83869HM have a regulated maximum safe current output?

This would depend on which mode and connection state DP83869 is in.

If 100M, since two of the pairs are not used, if unused pair is shorted, nothing would occur. 
If 1000M, if no connection is made, short will not matter, but if there is connection, the link will be dropped and once the link is dropped, the short will not matter since the link pulse will be shorting to ground. 

Best,
J

Hi J,

Thank you!  

Lets say for a 100M situation:  If TX+/TX- and RX+/RX- are all connected to ground, are you saying since the link pulse is being shorted to ground there is no danger of damaging the Ethernet PHY? 

Best regards,  SB

Hi SB, 

There is no danger of the PHY being damaged. One reason is because there is a transformer in between the cable and the PHY so the short will be isolated. In addition, the link will be dropped and the PHY will only send out link pulse which will not damage the PHY or the link partner. 

Best,
J

Thank you J! - that's what I assumed, but just wanted to make sure.