UCS1002-1 Datasheet, PDF (47/116 Pages) SMSC Corporation – Programmable USB Port Power Controller with Charger Emulation

Programmable USB Port Power Controller with Charger Emulation
Datasheet
Chapter 6 USB High-speed Data Switch
6.1 USB High-speed Data Switch
The UCS1002 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 UCS1002 is actively emulating using any of the charger emulation profiles except CDP (by
default - see Section 10.4.5, "High-speed Switch Configuration - 25h").
2. The UCS1002 is operating as a dedicated charger unless the HSW_DCE configuration bit is set
(see Section 10.4.5).
3. The UCS1002 is in the Detect state (by default) or in the Sleep state.
APPLICATION NOTE: If the VDD voltage is less than V_{DD_TH}, the high-speed data switch will be disabled and
opened.
6.1.1 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.
SMSC UCS1002
47
DATASHEET
Revision 1.4 (07-16-13)