TUSB2077A: USB SUSPEND MODE

VISHNU RAVURI

Prodigy 20 points

Part Number: TUSB2077A

As per our requirements ,USB suspend mode should always be in low , but as of now we are getting a high.

I'm attaching you the circuit diagram of USB hub and reset circuit.Please let me know where I am going wrong.

over 8 years ago

0 Joel Jimenez0 over 8 years ago

TI__Mastermind 18655 points

Hello Vishnu,

We are reviewing your question. I will be back with our answer shortly.

Regards

0 Joel Jimenez0 over 8 years ago in reply to Joel Jimenez0

TI__Mastermind 18655 points

Hello Vishnu,
Are you using all the dowsntream ports ?
Regards

0 Joel Jimenez0 over 8 years ago in reply to Joel Jimenez0

TI__Mastermind 18655 points

The unused downstream ports should be tied to ground.

Regards

0 VISHNU RAVURI over 8 years ago in reply to Joel Jimenez0

Prodigy 20 points

Hi Joel,

I required to enable all downstream ports.but now I required one port to enable for know the working of USB hub

0 Joel Jimenez0 over 8 years ago in reply to VISHNU RAVURI

TI__Mastermind 18655 points

Do you have any downstream port floating? If so, you need to pull them down.

The USB host completely controls USB suspend, which is why it isn't described in detail in the TUSB2046 specification. After 3 ms of USB interface inactivity, the TUSB2046 will go into suspend. The USB host is responsible for waking up the bus or various devices on the bus can signal a remote wake-up if the USB host enables them via a SET FEATURE command. For example, a mouse behind a TUSB2046 can wake up a suspended bus if the USB host enables both the mouse and the hub to signal remote wake-up.

Regards

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TUSB2077A: USB SUSPEND MODE