USBDP/DM power domain in CY7C65213

[TeMa_2997106]

Is the power domain of the two pins "USBDP" and "USBDM" VCCIO?

Vih and Vil are defined with reference to Vccio. Can USBDP/DM follow these specifications?

I would like to know if it is possible to input up to 3.6V, which is the USB2.0 full speed standard. And I also would like to know if Vih and Vil do not change even if 3.3V is applied to VCC.

Thanks,
Tetsuo

[MallikaK_22 · Accepted solution]

Hello Tetsuo-san,

Yes, DP/DM is pulled up to VCC.

No, we cannot manually change the max voltage level of USB DP and USB DM.

As per USB spec (Page 124), “ A USB transceiver is required to withstand a continuous short circuit of D+ and/or D- to VBUS, other data line , GND, or the cable shield at the connector, for a minimum of 24 hrs without degradation. This requirement must be met for a max value of VBUS (5.25V).

So, DP voltage can rise up to 5.25V in the enumeration phase.

May I know why is the customer looking for high voltage levels on DP?

Regards,

Mallika

[TeMa_2997106]

Mallika-san,

Thank you for your response.

If DP/DM is pulled up to Vcc, what is the maximum withstand voltage when 3.3V is applied to Vcc?

I just want to know if it is okay to put 3.6V in DP/DM when 3.3V is applied to Vcc.

Thanks,

Tetsuo

[MallikaK_22]

Hi,

Please find my comment below:

As per USB spec (Page 124), “ A USB transceiver is required to withstand a continuous short circuit of D+ and/or D- to VBUS, other data line , GND, or the cable shield at the connector, for a minimum of 24 hrs without degradation. This requirement must be met for a max value of VBUS (5.25V).

So, DP voltage can rise up to 5.25V in the enumeration phase.

Regards,

Mallika

[TeMa_2997106]

Mallika-san,

Thank you for answer again.

I will check the specifications.

Thanks,

Tetsuo