DP83848Q-Q1: 5V IO

Daniel Wang (auto)

Expert 4280 points

Part Number: DP83848Q-Q1

Tool/software:

Hello team,

We are using DP83848Q for our 100base-TX PHY application, but its IO voltage is 3.3V.

Is there any automotive grade 100base-TX PHY with 5V IO?

Regards,

Daniel Wang

6 months ago

0 David (ASIC) Liu 6 months ago

TI__Guru**** 183501 points

Daniel

Are you referring to the MAC interface? The picture you showed is the supply voltage which looks to be nominal of 3.3V, where does it show the requirement of 5V I/O?

Thanks

David

0 Daniel Wang (auto) 6 months ago in reply to David (ASIC) Liu

TI__Expert 4280 points

Hello David,

The following are captured form the latest DP83848Q-Q1 datasheet.

Yes, the PHY chip’s MAC interface (our application is RMII) can only support 3.3V, but our uP’s MAC interface is 5V, so they can’t connect directly.

My question is: Does TI have the similar PHY with 5V MAC interface? So that we can apply that instead of DP83848Q-Q1.

Daniel

0 David (ASIC) Liu 6 months ago in reply to Daniel Wang (auto)

TI__Guru**** 183501 points

Daniel

We do not have a PHY that can support 5V MAC I/O. Can you please provide the MAC datasheet? I don't see from the initial question that there is a 5V I/O requirement.

Thanks

David

0 Daniel Wang (auto) 6 months ago in reply to David (ASIC) Liu

TI__Expert 4280 points

Hello David,

Due to there is no MCU IO resource for MDIO, so customer wants to know if it is possible to leave the MDIO floating and do not configure the registers, all the registers will be kept as default value, what is the influence?

Thanks

Daniel

0 Shane Hauser 6 months ago in reply to Daniel Wang (auto)

TI__Mastermind 33165 points

Hi Daniel,

You can leave MDIO floating and configure the device with straps. The affect is you will not have register access.

Best,

Shane

Interface

Interface forum

DP83848Q-Q1: 5V IO