DP83869HM: Lowest Power MAC to SGMII Solution

Matthew Streicher

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

I am looking for the lowest power solution to do the following:

Ethernet Switch <------SGMII-----> Bridge Chip <------> Micro with 10/100 MAC (either MII or RMII) <---------> SPI-based radio

I came across the DP83869HM, though it seems to only support SGMII to Copper, in which case I'd need

Ethernet Switch <------SGMII-----> DP83869HM <------> PHY (such as DP83826IRHBR) <--------> Micro with 10/100 MAC (either MII or RMII) <---------> SPI-based radio

Is my understanding correct? If so, this is about 0.4W per conversion. Is there a more power efficient or elegant solution for this problem?

Thanks,

Matt

over 2 years ago

0 Hillman Lin over 2 years ago

TI__Mastermind 25955 points

Hi Matt,

Is your switch only support SGMII mode?

If your switch can only support SGMII mode, the solution you shown above would be the elegant solution.
If your switch can also support Copper as well, then only one PHY is required in between instead of two.

Regards,

Hillman Lin

0 Matthew Streicher over 2 years ago

Prodigy 20 points

Hillman,

The switch supports copper, though not with enough ports for what we need (this path will be duplicated four times).

Are you saying this is the correct path for SGMII (i.e. there isn't a lower power / better part I should be looking at from TI)?

Ethernet Switch <------SGMII-----> DP83869HM <------> PHY (such as DP83826IRHBR) <--------> Micro with 10/100 MAC (either MII or RMII) <---------> SPI-based radio

Thanks,

Matt

0 Hillman Lin over 2 years ago in reply to Matthew Streicher

TI__Mastermind 25955 points

Hi Matt,

Yes, DP83869 is the only PHY that support SGMII to copper communication with standard Ethernet application.

Regards,

Hillman Lin

0 Matthew Streicher over 2 years ago in reply to Hillman Lin

Prodigy 20 points

Thank you!

Interface

Interface forum

DP83869HM: Lowest Power MAC to SGMII Solution