TDP142-Q1: HPDIN, AUX questions

Hi,

Please see my response below

1. Regarding Pin24: HPDIN/RSVD9:

   Could you please confirm whether the HPDIN (Hot Plug Detect received) pin can accept a 1.8V input signal?
   Low = 0V
   High = 1.8V

HPDIN is a 2-state CMOS input, VIH is min of 2V and max of 3.6V. It can accept an input of 1.8V signal, but will not detect it as a valid high.

1. Regarding Pin16: AUXp and Pin17: AUXn,

   Could you please confirm whether it is acceptable to add a 100 nF series capacitor on each line to AUXp and AUXn, as shown in the red circle in Figure 1 below?

   I noticed that the reference schematic does not include a 100 nF series capacitor on Pin16: AUXp and Pin17: AUXn

Why do you want to add AC coupling capacitor on AUXP/N? AUXP/N is supposedly DC connected to the AUX bus between the source and the DP receptacle.

Thanks

David

Hi David,

The SoC specification requires the AUX capacitors to be placed close to the connector, and these AUX capacitors are used as DC blocking capacitors. Therefore, we would like to first confirm whether this design approach is acceptable, thanks.