7.4 Device Functional Modes

7.4.1 Device Configuration

Table 7-1. Control Pin Settings (Typical Values)

PIN

DESCRIPTION

LOGIC STATE

TYP

UNITS

EQ1/EQ2

Receiver equalization amount

Low

3

dB

Floating

6

dB

High

9

dB

OS1/OS2

Transmit output swing amplitude for the

transition bit

Low

0.9

Vpp

High

1.1

Vpp

DE1/DE2

Transmit de-emphasis amount

Low

0

dB

Floating

–3.5

dB

High

–6.2

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.

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TUSB522P

SLLSEV9E – JULY 2016 – REVISED NOVEMBER 2023

Copyright © 2023 Texas Instruments Incorporated

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