DP83865 bandgap resistor

user3969614

Prodigy 30 points

Other Parts Discussed in Thread: DP83865

I am using DP83865 and i have 1Gb link problem.

I changed BG_REF pin resistor from 9.76kOhm to 6.7kOhm and

i get a good 1Gb link.

Is there any idea that what was cause of 1Gb link problem

and why i get good link when i changed band gap reference resistor?

Thank you.

over 10 years ago

0 Patrick OFarrell over 10 years ago

TI__Mastermind 31600 points

Changing the BG_REF resistor value is not recommended. This resistor sets the reference voltage for many of the internal functions of the device and needs to 9.76 kOhms.

We have a Trouble Shooting Guide in the DP83865 product folder (www.ti.com/.../snla065). I would suggest using that to investigate the functionality you are seeing.

Patrick

0 user3969614 over 10 years ago in reply to Patrick OFarrell

Prodigy 30 points

Can you tell me about why i had a good 1Gb link when i changed BG_REF resisitr?
I read trouble shooting guide and i connect 9.76kOhms. But in that case i cant get 1Gb link.
I think the BG_REF resistor value is key to my 1Gb link problem.

Interface

Interface forum

DP83865 bandgap resistor