TPS23754: Sifos test fail at Cdet item

Emma Tsai

Part Number: TPS23754

Tool/software:

Hi team,

We're doing the Sifos test at PD portion with UTP cable and the Cdet value is fail which is over 0.12, but if we change to STP cable, this test will pass. Is there any reason to get the different results?

1 month ago

0 Zhining Zhang 1 month ago

TI__Intellectual 2890 points

Hi Emma,

Thanks for reaching out.

The UTP and STP will have different parasitic capacitance for the cable, which may have impact on the Cdet reading on the PSE side.

May I know what cables are these two? Are they cat5? And how long are the cables used here?

Meanwhile, can you also provide the schematic for the PD part?

Best,

Zhining

0 Emma Tsai 1 month ago in reply to Zhining Zhang

Prodigy 10 points

Hi Zhining,

Thanks for your feedback. UTP is 2m Cat5e cable, and the STP is 5m Cat5e cable.

0 Zhining Zhang 1 month ago in reply to Emma Tsai

TI__Intellectual 2890 points

Hi Emma,

The cable sounds ok to me.

Could you provide the schematic and the Sifos test report?

Best,

Zhining

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TPS23754: Sifos test fail at Cdet item