TUSB211: Which device should I use as USB repeater

user5013697

Intellectual 490 points

Part Number: TUSB211
Other Parts Discussed in Thread: TUSB2036, , TUSB212

Hello

Our customer would like to extend USB cable by using TUSBxx device.

Could you please see attached file and pelase your advice.

Best regardsQuestion about TUSB devices.pptx

Yamane

over 8 years ago

0 Diego Cortes over 8 years ago

TI__Mastermind 36085 points

Hello Yamane,

For this kind of implementation, the customer must use a HUB, just take into account that the TUSB2036 is a full-speed hub, if you want HS (480Mbps) we recommend the TUSB4020B.

Regards,

Diego.

0 user5013697 over 8 years ago in reply to Diego Cortes

Intellectual 490 points

Hello Diego

Thank you for your reply.

Could you please tell us the details a little more.

1: Why we cannot use TUSB211(conditioner device) for this use case? what kind of situation should we use TUSB211?

2: in case of using USB-HUB device (TUSB2036 or 4020), can we use the device in default PID/VID setting?

Must we set the PID/VID individualy?

Best regards

Yamane

0 Masayoshi Takahashi over 8 years ago in reply to Diego Cortes

TI__Intellectual 1530 points

Hi Diego,

In this case, the customer doesn't separate the output. I think that using some TUSB211s is better than using hub, because they will use just one port.
Could you tell me why you recommended TUSB2036 or TUSB4020B. I think It would be over spec by using hub device.

I understand you are very busy, but it is greatly appreciated if you could complete this.

Regards,
Masa

0 Diego Cortes over 8 years ago in reply to user5013697

TI__Mastermind 36085 points

Hello Yamane,

The issue is that you have a total of 15m cable, this length has a massive DC loss which can't be compensated by our device. This is without mentioning that the specification max cable length is 5m (this is 3 times longer). So the addition of two HUBS will split the channel in segments of 5m (this is because each HUB will receive and re-transmit the packets), keeping the design within the USB specification.

Yes, you can use the HUBs with the default PID/VID settings.

Regards,
Diego.

0 Diego Cortes over 8 years ago in reply to Masayoshi Takahashi

TI__Mastermind 36085 points

Hello Masa,

I recommended the HUBs because there is no way the TUSB211 can support such length due to the DC loss in the cables. I understand that the customer will use only one downstream port, but still it is the safe way to do it (actually the only one so far).

Best regards,
Diego.

0 Masayoshi Takahashi over 8 years ago in reply to Diego Cortes

TI__Intellectual 1530 points

Hi Diego,

Thanks for your reply!

I understood. TUSB211 is just signal conditioner. It can not compensate the DC loss. Am I correct?

Regards,

Masa

0 user5013697 over 8 years ago in reply to Diego Cortes

Intellectual 490 points

Thank you for your reply.

According to your answer, does it mean that TUSB211 cannot use to expand USB cable length?
We think that TUSB211 can use for expand the cable by translate every 5m or less.
Does it misanderstanding?

Best regard
Yamane

0 Diego Cortes over 8 years ago in reply to user5013697

TI__Mastermind 36085 points

Hello yamane,

The TUSB211 can be used to expand the cable length as long as the DC loss in the channel allows a minimum amplitude. 15m is a long cable and needs DC gain. The TUSB211 only corrects the signal's slew rate during HS transmissions.

Regards,

Diego.

0 user5013697 over 8 years ago in reply to Diego Cortes

Intellectual 490 points

hello Diego

Thank you for your answer, does not TUSB211 have amplifier to gain the sinked signal amplitude, does it?

please close this case.

best regard

Yamane

0 Diego Cortes over 8 years ago in reply to user5013697

TI__Mastermind 36085 points

Hello Yamane-san,

That is correct. We have the upcoming versions TUSB212/213 (next couple of months I estimate) that have amplitude gain capabilituies if you are interested (but still 15 meters would require a HUB due to timeout constraints in the USB specification).

Regards,

Diego.

0 user5013697 over 8 years ago in reply to Diego Cortes

Intellectual 490 points

helle Diego

Thank you for your polite explanation.

I understood it , so please close this case.

Thank you

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TUSB211: Which device should I use as USB repeater