TUSB211-Q1: ENA_HS

Kuramochi Tadahiko

Guru 28715 points

Part Number: TUSB211-Q1

Hi,

The ENA_HS pin is asserted after three secs from Vcc starts up as follows on customer's circuit.

Is this behavior correct?

Best Regards,

Kuramochi

over 8 years ago

0 Diego Cortes over 8 years ago

TI__Mastermind 36085 points

Hello Kuramochi-san,

ENA_HS indicates that there is HS activity (480Mbps) in the differential pair, I don't see any issue here.

Regards,

Diego.

0 Kuramochi Tadahiko over 8 years ago in reply to Diego Cortes

Guru 28715 points

Hi Diego-san,

Thank you for your reply.

Follows are another waveforms on the same time line with previous one;

As you can see, there is no signal on D+/- when ENA_HS rises up.

Although the detection of HS is not executed, why does ENA_HS rise up?

Best Regards,

Kuramochi

0 Diego Cortes over 8 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 36085 points

Kuramochi-san,

In this case, I assume that the purple channel is ENA_HS but what are the other signals, also please provide a detailed test procedure.

Regards,
Diego.

0 Kuramochi Tadahiko over 8 years ago in reply to Diego Cortes

Guru 28715 points

Diego-san,

Sorry for uncertainly.
Follows are information of waveforms.

Yellow: D-
Blue: D+
Green: VBUS_5V

I would like to know why ENA_HS rises up without D± signal.

Best Regards,
Kuramochi

0 Diego Cortes over 8 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 36085 points

Kuramochi-san,

Please share the test procedure, I also want to know if this behavior has been seen on more than one unit. I would like to try to reproduce the issue , so a detatiled description of the test procedure will help me to do so.

Regards,
Diego.

0 Kuramochi Tadahiko over 8 years ago in reply to Diego Cortes

Guru 28715 points

Diego-san,

I contacted you directly.
Please check your e-mail.

Best Regards,
Kuramochi

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TUSB211-Q1: ENA_HS