6.4 Device Functional Modes

6.4.1 Shutdown Mode

The Shutdown mode is entered when EN pin is low and VCC is active and stable. This mode is the lowest power

state of the TUSB1002A. While in this mode, the TUSB1002A receiver terminations is disabled.

6.4.2 Disconnect Mode

Next to Shutdown Mode, the Disconnect mode is the lowest power state of the TUSB1002A. The TUSB1002A

enters this mode when exiting Shutdown mode. In this state, the TUSB1002A periodically checks for far-end

receiver termination on both SSTX1 and SSTX2. After detection of the far-end receiver’s termination on both

ports, the TUSB1002A transitions to a fully active mode called U0 mode.

6.5 U0 Mode

The U0 mode is the highest power state of the TUSB1002A. Anytime high-speed traffic (SuperSpeed or

SuperSpeedPlus) is being received, the TUSB1002A remains in this mode. The TUSB1002A only exits this

mode if electrical idle is detected on both SSRX1 and SSRX2. While in this mode, the TUSB1002A hs speed

receivers and transmitters are powered and active.

6.6 U1 Mode

The U1 mode is the intermediate mode between U0 mode and U2/U3 mode. In U1 mode, the TUSB1002A

receiver termination remains enabled and the TXP/N DC common mode is maintained.

6.7 U2/U3 Mode

Next to the disconnect mode, the U2/U3 mode is next lowest power state. While in this mode, the TUSB1002A

periodically performs far-end receiver detection. Anytime the far-end receiver termination is not detected on

either CH1 or CH2, the TUSB1002A leaves the U2/U3 mode and transition to the Disconnect mode. The

device also monitors the SSRX1 and SSRX2 for a valid LFPS. After a valid LFPS is detected, the TUSB1002A

immediately transitions to the U0 mode.

TUSB1002A

SLLSF63C – MARCH 2018 – REVISED JULY 2024

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