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TUSB522P

SLLSEV9A – JULY 2016 – REVISED OCTOBER 2016

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Copyright © 2016, Texas Instruments Incorporated

7.4 Device Functional Modes

7.4.1 Device Configuration

Table 1. Control Pin Settings (Typical Values)

PIN

DESCRIPTION

LOGIC STATE

GAIN

EQ1/EQ2

Equalization Amount

Low

3 dB

Floating

6 dB

High

9 dB

PIN

DESCRIPTION

LOGIC STATE

OUTPUT DIFFERENTIAL VOLTAGE FOR

THE TRANSISTION BIT

OS1/OS2

Output Swing Amplitude

LOW

0.9 Vpp

HIGH

1.1 Vpp

PIN

DESCRIPTION

LOGIC STATE

DE-EMPHASIS RATIO

FOR OS = LOW

FOR OS = HIGH

DE1/DE2

De-Emphasis Amount

Low

0 dB

–2.6 dB

Floating

–3.5 dB

–5.9 dB

High

–6.2 dB

–8.3 dB

7.4.2 Power Modes

The TUSB522P has 3 primary power modes:

7.4.2.1 U0 Mode (Active Power Mode)

During active power mode, U0, the device is transmitting USB SS data or USB LFPS signaling. The U0 mode is

the highest power state of the TUSB522P. Anytime super-speed traffic is being received, the TUSB522P remains

in this mode.

7.4.2.2 U2/U3 (Low Power Mode)

While in this mode, the TUSB522P periodically performs far-end receiver detection.

7.4.2.3 Disconnect Mode - RX Detect

In this state, the TUSB522P periodically checks for far-end receiver termination on both TX. Upon detection of

the far-end receiver’s termination on both ports, the TUSB522P will transition to U0 mode.

7.4.2.4 Shutdown Mode

Shutdown mode is entered when the EN_RXD pin is driven low. This is lowest power setting for the device.