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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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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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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
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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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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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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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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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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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Hello,
Could you please attach your schematic for us to review?
Best Regards,
Sananya
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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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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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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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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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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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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.
Best regards,
saeki
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Hello,
This issue was discussed over Tech Support Case and firmware fix provided for the same.
Best Regards,
Sananya