DP83867IS: powerup sequencing problem in 2 supply mode

Aniket Jadhav

Part Number: DP83867IS

As per datasheet For DP83867 in 2 supply mode power sequencing is not required ans same thing we have followed.Power will be applied to the device like this

1V--->3.3V---->2.5V.

If i give 2.5V---> 1V----->3.3V,then it is working.

Please clarify us what is wrong.

over 6 years ago

0 Ross Pimentel over 6 years ago

TI__Mastermind 23675 points

Hi Aniket,

With the 1V, 3.3V and 2.5V sequence, what are the ramp times and delay times from each supply?

For the 2.5V, 1V and 3.3V sequence, what are the ramp times and delay times from each supply?

0 Aniket Jadhav over 6 years ago in reply to Ross Pimentel

Prodigy 40 points

Pls find attached file ramp time and delays as you required

0 Ross Pimentel over 6 years ago in reply to Aniket Jadhav

TI__Mastermind 23675 points

Hi Aniket,

Can you send me a schematic please?

Also, when you see the odd behavior, can you detail exactly what you are seeing?

Link failures, bit errors, link stability...etc?

0 Aniket Jadhav over 6 years ago in reply to Ross Pimentel

Prodigy 40 points

0 Aniket Jadhav over 6 years ago in reply to Aniket Jadhav

Prodigy 40 points

This is the schematic of IC interfaced with P1021 processor.In problem case MDIO interface itself is not working.

0 Ross Pimentel over 6 years ago in reply to Aniket Jadhav

TI__Mastermind 23675 points

If you apply a RESET through the RESET_N pin after power-up is the issue resolved?

If you toggle the INT/PWDN_N pin after power-up is complete, is the issue resolved?

Do you see link established when the issue occurs? Do you see data transfer when the issue occurs?

Only SMI (MDIO/MDC) is not working?

Interface

Interface forum

DP83867IS: powerup sequencing problem in 2 supply mode