SN75DP130 DS vs SS

Brian Rutkowski81

We have a design intended for the SN75DP130DS.

We built with the SN75DP130SS. OOPS.

We would like to re-work the boards to keep the SS part. The re-work requires pins 15, 21, 37, and 43 to be connected to VCC. They are marked as NC or GND in the datasheet. Will it affect operation in any way to tie these pins to VCC?

Also, is there and reason that writing to the DPCD registers will not work directly out of reset? It seems that we have to wait roughly ~10s after reset before changes to the DPCD registers can be made. The part is still responsive via I2C, but large delays have to be inserted.

over 10 years ago

0 Elias Villegas M. over 10 years ago

TI__Guru* 76130 points

Hello,

10 seconds seems too long, can you describe your set up? are you following the power up sequence?
I will have to go with Design Team for the RSVD pins question.
Regards

0 Brian Rutkowski81 over 10 years ago in reply to Elias Villegas M.

Prodigy 20 points

It turns out that the 10 seconds was due to the fact that the DPCD registers can not be written unless HPD is asserted. This makes some sense conceptually, but also seems to be undocumented behavior.

0 Elias Villegas M. over 10 years ago in reply to Brian Rutkowski81

TI__Guru* 76130 points

Hello,

The RSVD pins are not internally connected so you can leave them floating or connect them to GND.
Regards

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SN75DP130 DS vs SS