https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/<p style="display:none;">blank</p>en-USTelligent Community 13https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6311520Thu, 16 Apr 2026 13:31:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3b41a784-d575-47ae-b96c-de5ea4447447Brian Zhouwhat is the trace length between 3320 to 1002A and 1002A to USB device? Maybe need to change EQ setting for Gen1. Best Brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1637337/tmuxhs4212-tmuxhs4212-supply-voltage-rangeThu, 16 Apr 2026 13:10:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:028291f9-f53a-455c-8de4-54b318398dbcChristoph HessPart Number: TMUXHS4212 I planned to use the TMUXHS4212 to switch the signals of an USB-C interface. In the datasheet two supply voltage ranges (1.8V/3.3V) are described. Our system works with a supply rail of 2.7V which seems to be incompatible with this switch. Is that really the case? Whats the reason for excluding the supply voltage range between 1.98V and 3.0V?TMUXHS4212https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6310863Thu, 16 Apr 2026 05:06:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:e3735904-04f2-42b7-a230-2bece81af5cbF MasaThat&#39;s right. Since standard USB devices work fine when connected to this USB hub, I don&#39;t think there&#39;s a problem with the hub itself. This issue has been observed with multiple USB hubs, so I&#39;m trying to determine if there&#39;s any difference between connecting directly to the host PC and using a USB hub.https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6310854Thu, 16 Apr 2026 04:57:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:725c789b-e1a1-4b31-a631-2155b6197296Brian Zhouso the hub was detected as Gen1 , but your board was not detected? Best brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6310843Thu, 16 Apr 2026 04:49:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1431f406-8fd6-44e3-b742-e27544458d6bF MasaHi Brian Zhou, The USB hub is connected directly to the host. When I remove the USB hub, it is recognized, but when I insert the USB hub, it is no longer recognized. Best Regeards,https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6310834Thu, 16 Apr 2026 04:42:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:87bf659f-31ca-4e16-ab14-cd356948a820Brian Zhouthe hub is directly connected to host, right? It has nothing to do your board. Best Brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6310683Thu, 16 Apr 2026 02:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:db6630db-fc2d-4b39-8fc0-ef27fa0494ffF MasaHi Brian Zhou, The settings for the TUSB1002A are as follows: TX EQ 8 RX EQ 0 CFG 11 These settings ensure that the device is recognized when connected to the host PC. I also looked for settings that would allow the USB hub to be recognized, but I couldn’t find any. Best Regeards,https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1635462/tmuxhs4446evm-using-tmuxhs4446evm-as-usbc-ufp/6310424Wed, 15 Apr 2026 21:38:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1ad53f59-bb68-4782-99eb-3c988680adf6Adrian Sacalxot-BerriosHi Nadeem, What application is this being used for? Are you following a specific reference design for Display Port alternate modes? Thanks, Adrian Sacalxot-Berrioshttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1636715/tmux1072-ovp-request/6310378Wed, 15 Apr 2026 21:03:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2705ff4e-6807-4088-baf8-dbc4b702ea9eKaty WestHi Tommy, We can confirm that operating within the datasheet abs max will not cause the device any damage. However, to ensure proper functioning of the part, you would need to stay within the recommended operating conditions. It is possible that the device will still operate outside of recommend operating conditions but inside abs max conditions, but you would need to test that out on your side. Best, Katyhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6309652Wed, 15 Apr 2026 13:29:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:fcf1a591-641a-4c6f-babc-c5c4d88baaf8Brian Zhouwhat is eq setting for TUSB1002A? Best Brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1636715/tmux1072-ovp-requestWed, 15 Apr 2026 07:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:ad3bff50-e258-488b-b830-1e69cc7333f3Tommy TzengPart Number: TMUX1072 Other Parts Discussed in Thread: TMUXHS221F Hi Team, is there an analog switch IC similar to TMUX1072 that operate with 5v single supply, protect 5v Mcu signal, and provide power-off protection with up to 28v tolerance? we found that the TMUXHS221F switch IC is similar to our application, however, why is the max allowed voltage on the D1/D2 bus 6v,while table 5.3 recommends max of 3.6v? if is uesd for USB2.0 mux application, shouldn&#39;t the V_i/o support 5v? can the TMUXHS221F be used in a 5v applicaiton?TMUXHS221FWired networkingTMUX1072https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6308782Wed, 15 Apr 2026 02:51:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a9a9c4da-672a-45fc-af0c-f8f9d506e12cF MasaHi Brian Zhou, I&#39;m using both cables. I&#39;m testing with multiple USB hubs and cables. Best Regeards,https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6308778Wed, 15 Apr 2026 02:44:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:38141061-e932-462b-a117-c67a0afc736bBrian Zhouwhat cable used for hub? type-C to type-C or type-C to tyep-A? Best brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6308622Tue, 14 Apr 2026 23:36:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:b48889ee-e57d-4eef-8123-80339c69ad7eF MasaHi Brian Zhou, It is recognized. When a standard USB flash drive is connected, it operates as Gen1. Best Regeards,https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6307659Tue, 14 Apr 2026 13:23:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:416c8d2e-8a4e-41f3-8ce9-2ece98772da7Brian Zhouwhen host is gen1, did hub got recognized as gen1 without your board connected? Best brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6306791Tue, 14 Apr 2026 01:59:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7939e08a-271a-4b28-9654-ab28bc09c268F MasaIt is not connecting with most USB hubs. When using a USB hub designed for Gen2, the device is recognized if the host port is Gen2, but it is not recognized if the host port is Gen1. When I check the packets with a USB analyzer while the USB hub is connected, the device is sending TS1, but the host has not transitioned to TS2. I have attached the analyzer data from when TS1 was output for an extended period. The USB hub port is intended for connecting downstream devices. Can you suggest any possible causes? e2e.ti.com/.../USB_5F00_HUB_5F00_NG.usbhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6306760Tue, 14 Apr 2026 01:31:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:773a1c8e-2b87-4ccb-96ac-aae07adc2800Brian ZhouPlease draw a block diagram . does type-C port connected to hub downstream port? Best Brianhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6306710Tue, 14 Apr 2026 00:43:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:81860103-0af8-49a1-80f8-f8309a9b86ddF MasaHi Brian Zhou, The board functions as a USB device and has a connector on it. When this board is connected directly to a host PC, it is recognized as Gen1, but when connected via a USB hub, it is not recognized as Gen1. In the case of Gen2, it is recognized normally. Best Regeards,https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1635462/tmuxhs4446evm-using-tmuxhs4446evm-as-usbc-ufp/6306162Mon, 13 Apr 2026 17:10:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:0f4a3411-788f-4e4c-bf00-0014910106abKaty WestHi Nadeem, Reassigning to the team that handles TPS65987D to comment on the firmware/ programming Qs. Best, Katyhttps://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1633740/hd3ss3220-regarding-the-coupling-capacitance-used-with-the-hd3ss3220/6305910Mon, 13 Apr 2026 15:07:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:34f06301-1130-4150-942b-34fe100185dfBrian ZhouHi Masa: So there is USB connector on the board, if plugged USB3 flash, it works fine, but if plugged a USB3 hub, it didn&#39;t work, is it correct? Best Brian