Nov 15, 2006 #1 I ilikebbs Advanced Member level 4 Joined Nov 30, 2002 Messages 104 Helped 3 Reputation 6 Reaction score 1 Trophy points 1,298 Activity points 705 As you all know that transformer is used between PHY and RJ45. My question is that why CT pin always connect to power。 Is it necessary? Anybody can give your suggestion. thanks
As you all know that transformer is used between PHY and RJ45. My question is that why CT pin always connect to power。 Is it necessary? Anybody can give your suggestion. thanks
Nov 15, 2006 #2 VVV Advanced Member level 5 Joined Nov 26, 2004 Messages 1,575 Helped 384 Reputation 768 Reaction score 88 Trophy points 1,328 Activity points 19,971 Re: a question about transformer used in ethernet applicatio The drivers are usually open-drain, that is why the center tap is connected to power, so the drivers can drive the transformer.
Re: a question about transformer used in ethernet applicatio The drivers are usually open-drain, that is why the center tap is connected to power, so the drivers can drive the transformer.
Nov 16, 2006 #3 I ilikebbs Advanced Member level 4 Joined Nov 30, 2002 Messages 104 Helped 3 Reputation 6 Reaction score 1 Trophy points 1,298 Activity points 705 Do you mean that MDI pin of PHY are open-drain? So why center tap is connected to the power? We can also pull up MDI pin. thank you for further explaination.
Do you mean that MDI pin of PHY are open-drain? So why center tap is connected to the power? We can also pull up MDI pin. thank you for further explaination.
Nov 16, 2006 #4 budhy Advanced Member level 3 Joined Oct 21, 2006 Messages 823 Helped 218 Reputation 436 Reaction score 32 Trophy points 1,308 Location Indonesia Activity points 5,225 Re: a question about transformer used in ethernet applicatio We can also pull up MDI pin. Click to expand... You right. the transformer is the pull-up compnent, so the signal is transformed to the net.
Re: a question about transformer used in ethernet applicatio We can also pull up MDI pin. Click to expand... You right. the transformer is the pull-up compnent, so the signal is transformed to the net.