TUSB8042A: select a proper USB3.0 hub

BX27

Part Number: TUSB8042A
Other Parts Discussed in Thread: TUSB8044A

hi there

we are choosing hub for general USB3.0 ( 5Gbps) usage. Either 1:2 or 1:4 is ok.

There are still many candidates as below after filtering. Could you pls introduce the main difference from tech perspective? Also we would like to know which one is more wildely used from supply-chain perspective.

Thanks!

11 months ago

+1 David (ASIC) Liu 11 months ago

TI__Guru**** 156576 points

Hi,

Please see this app note for the difference among the hubs, www.ti.com/.../slla445.pdf. For the latest hub, please use TUSB8044A.

Thanks

David

+1 BX27 11 months ago in reply to David (ASIC) Liu

Genius 3870 points

Hi David, may I ask what does "USB billboard" function? thanks.

+1 David (ASIC) Liu 11 months ago in reply to BX27

TI__Guru**** 156576 points

Hi,

There are 2 main functions in a USB Type-c design. One is power negotiation, 2nd is alternate mode.

The USB Billboard Device Class definition describes the methods used to communicate the Alternate Modes supported by a Device Container to a host system. This includes string descriptors that can be used to provide support details in a human-readable format.

If a device fails to successfully enter an Alternate Mode within tAMETimeout then the device shall minimally expose a USB 2.0 interface (USB Billboard Device Class) that is powered by VBUS for popping-up message window to the user.

Thanks

David

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TUSB8042A: select a proper USB3.0 hub