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USB low-full-high speed peripherals Forum Discussions

Anonymous
Not applicable

A temperature-humidity sensor is connected by I2C master setting and a temperature-humidity sensor isn't sometimes seen by power supply on. The frequency of occurrence will be about 1/100 times. When occurring, a device isn't seen from a device manager of Windows. Even re-scan of H/W isn't restored. It's restored by power supply off on.

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Sananya_14
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750 replies posted 500 replies posted 250 solutions authored

Hello,

-What is the driver and OS version you are using?

-Please attach a screenshot of the device manager when the USB Serial device disappears.

Best Regards,

Sananya

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Anonymous
Not applicable

Hello.

-What is the driver and OS version you are using?

  OS:windows 7

-Please attach a screenshot of the device manager when the USB Serial device disappears.

The following device isn't detected.

  USB Serial(Single Channel)Vendor 1

  USB Serial(Single Channel)Vendor MFG

  NG device manager.jpg

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Hello,

- I assume that you are using dual channel USB-Serial device. If yes, please let me know if the other channel is being detected on the device manager.

- Please let me know the reset timing that is used on the USB-Serial IC.

Best regards,

Srinath S

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Anonymous
Not applicable

Hello,

- I assume that you are using dual channel USB-Serial device. If yes, please let me know if the other channel is being detected on the device manager.

single channel device is used.

- Please let me know the reset timing that is used on the USB-Serial IC.

  A reset is floating.

Best regards,

T Saeki

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Hello Takao Saeki,

Can you please use a RC reset circuitry with a timing of at least 1us? This can ensure proper power-on-sequence of the CY7C65211 device.

Best regards,

Srinath S

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Anonymous
Not applicable

hello,

Can you please use a RC reset circuitry with a timing of at least 1us?

This can ensure proper power-on-sequence of the CY7C65211 device.

-> Please tell me recommended value of RC.

best regard,

T Saeki

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Sananya_14
Moderator
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750 replies posted 500 replies posted 250 solutions authored

Hello Takeo Saeki,

Recommended values for RC can be 100 ohms and 0.01 uF as used in our DVK.

Best Regards,

Sananya

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Anonymous
Not applicable

Hello,

- Recommended values for RC can be 100 ohms and 0.01 uF as used in our DVK.

Thank you very much for your answer.

  I'll try.

  -> I tried, but it didn't change to the symptom.

Best Regards,

T saeki

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Sananya_14
Moderator
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750 replies posted 500 replies posted 250 solutions authored

Hello,

Could you please attach your schematic for us to review?

Best Regards,

Sananya

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Anonymous
Not applicable

hello,

I send a circuit diagram via an agency and have check it,

and it's said that there are no problems.

Best Regard,

T saeki

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Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

Will it be possible to check the USB traces and share with us when the device gets stuck?

Best Regards,

Sananya

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Anonymous
Not applicable

hello sanm san,

I send a USB Trace via an agency and have check it,

  The command is being sent by order of BUS_RESET, SET_ADDRESS and GET_DESCRIPTOR.

    It's no response from GET_DESCRIPTOR.

     it's re-tried on the host side, it's a condition of no response.

Best Regard,

T saeki

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Sananya_14
Moderator
Moderator
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750 replies posted 500 replies posted 250 solutions authored

Hello,

Please attach the part of the trace where the GET_DESCRIPTOR fails. We can check for the exact error. Also, please let me know if your device is self powered or bus powered?

Best Regards,

Sananya

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Anonymous
Not applicable

Hello,

A trace file was attached.

8/31 insert trace file (Ellisys USB Analysis Software )

No.82 is a relevant part.

Even SelfPower and BUSPower occur.

Best Regards,

T saeki

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Sananya_14
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hello,

From the traces, it seems like the SETUP transaction is timing out continuously due to no response from the device. Could you probe the D+/D- lines and check the voltage levels corresponding to the trace?

Best Regards,

Sananya

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Anonymous
Not applicable

Hi Sanm san,

A picture of the abnormal is attached.

Ch1 : VBUS ,Ch2 : Power ,Ch3 : D- ,Ch4 : D+

X scal : 4sec/div , Y scal : 2V/div

A part in right end is an abnormal part.

D+ signal is falling gradually.

I fall to the Low level finally.

pastedImage_4.png

Best regards,

saeki

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Sananya_14
Moderator
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750 replies posted 500 replies posted 250 solutions authored

Hello,

This issue was discussed over Tech Support Case and firmware fix provided for the same.

Best Regards,

Sananya

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