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TUSB1002

SLLSEU4A – MAY 2016 – REVISED MAY 2016

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Copyright © 2016, Texas Instruments Incorporated

7.3.4 Receiver Detect Control

The SLP_S0# pin offers system designers the ability to control the TUSB1002 Rx.Detect functionality during

Disconnect and U2/U3 states and therefore achieving lower consumption in these states. When the system is in

a low power state (Sx where x = 1, 2, 3, 4, or 5), system can assert SLP_S0# low to disable TUSB1002 receiver

detect functionality. While SLP_S0# is asserted low and USB 3.1 interface is in U3, the TUSB1002 keeps

receiver termination active. The TUSB1002 will not respond to any LFPS signaling while in this state. This means

that system wake from U3 is not supported while SLP_S0# is asserted low. If the TUSB1002 is in Disconnect

state when SLP_S0# is asserted low, then TUSB1002 disables both channels receiver termination. When

SLP_S0# is asserted high, the TUSB1002 resumes normal operation of performing far-end receiver termination

detection.

7.3.5 USB3.1 Dual Channel Operation (MODE = “F”)

The TUSB1002 in dual-channel operation waits for far-end terminations on both channels 1 and 2 before

transitioning to fully active state (U0 mode). This mode of operation, defined as MODE pin = ‘F’, is the most

common configuration for USB3.1 Source (DFP) and Sink (UFP) applications.

7.3.6 USB3.1 Single Channel Operation (MODE = “1”)

In some applications, like Type-C USB3.1 active cables, only one of the two channels may be active. For this

application, setting MODE pin = ‘1’, enables single-channel operation. In this mode of operation, the TUSB1002

attempts far-end termination on both channels 1 and 2. The channel which has a far-end termination detected

will be enabled while the remaining channel will be disabled. If far-end termination is detected on both channels,

then TUSB1002 behaves in dual channel operation (both channels enabled).

NOTE

This feature is not available in RMQ package. Pin should be left unconnected for RMQ

package.

7.4 Device Functional Modes

7.4.1 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 TUSB1002. While in this mode, the TUSB1002 receiver terminations is disabled.

7.4.2 Disconnect Mode

Next to Shutdown Mode, the Disconnect mode is the lowest power state of the TUSB1002. The TUSB1002

enters this mode when exiting Shutdown mode. In this state, the TUSB1002 periodically checks for far-end

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

ports, the TUSB1002 transitions to a fully active mode called U0 mode.

When SLP_S0# is asserted low and the TUSB1002 is in Disconnect mode, the TUSB1002 will remain in

Disconnect mode and never perform far-end receiver detection. This allows even lower TUSB1002 power

consumption while in the Disconnect mode. Once SLP_S0# is asserted high, the TUSB1002 again starts

performing far-end receiver detection so it can know when to exit the Disconnect mode.

7.5 U0 Mode

The U0 mode is the highest power state of the TUSB1002. Anytime high-speed traffic (SuperSpeed or

SuperSpeedPlus) is being received, the TUSB1002 remains in this mode. The TUSB1002 only exits this mode if

electrical idle is detected on both SSRX1 and SSRX2. While in this mode, the TUSB1002 hs speed receivers

and transmitters are powered and active.

7.6 U1 Mode

The U1 mode is the intermediate mode between U0 mode and U2/U3 mode. In U1 mode, the TUSB1002’s

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