UCS1001 datasheet(34/59 Pages) MICROCHIP

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USB Port Power Controller with Charger Emulation

Datasheet

Revision 1.2 (05-21-12)

SMSC UCS1001

DATASHEET

Chapter 5 USB High-speed Data Switch

5.1

USB High-speed Data Switch

The UCS1001 contains a series USB 2.0 compliant high-speed switch between the DPIN and DMIN

pins and between the DPOUT and DMOUT pins. This switch is designed for high-speed, low latency

functionality to allow USB 2.0 full-speed and high-speed communications with minimal interference.

Nominally, the switch is closed in the Active state, allowing uninterrupted USB communications

between the upstream host and the portable device. The switch is opened when:

1. The UCS1001 is actively emulating using any of the charger emulation profiles except CDP.

2. The UCS1001 is operating as a dedicated charger.

3. The UCS1001 is in the Detect state or in the Sleep state.

APPLICATION NOTE: If the VDD voltage is less than VDD_TH, the high-speed data switch will be disabled and

opened.

5.1.1

USB-IF High-speed Compliance

The USB data switch will not significantly degrade the signal integrity through the device DP / DM pins

with USB high-speed communications.

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