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1/18/2017

2016-11-0004

PT0493-4

16

PI5USB2546

Wake on USB Feature (Mouse/Keyboard Wake Feature)

USB 2.0 Background Information

The PI5USB2546 data lines interface with USB 2.0 devices. USB 2.0 defines three types of devices according to data rate.

These devices and their characteristics relevant to PI5USB2546 Wake on USB operation are shown below:

Low-speed USB devices



1.5 Mb/s



Wired mice and keyboards are examples



No devices that need battery charging



All signaling performed at 2.0V and 0.8V hi/lo logic levels



D- high to signal connect and when placed into suspend



D- high when not transmitting data packets

Full-speed USB devices



12 Mb/s



Wireless mice and keyboards are examples



Legacy phones and music players are examples



Some legacy devices that need battery charging



All signaling performed at 2.0V and 0.8V hi/lo logic levels



D+ high to signal connect and when placed into suspend



D+ high when not transmitting data packets

High-speed USB devices



480 Mb/s



Tablets, phones and music players are examples



Many devices that need battery charging



Connect and suspend signaling performed at 2.0V and 0.8V hi/lo logic levels



Data packet signaling performed a logic levels below 0.8V



D+ high to signal connect and when placed into suspend (same as a full-speed device)



D+ and D- low when not transmitting data packets

Wake On USB

Wake on USB is the ability of a wake configured USB device to wake a computer system from its S3 sleep state back to its S0

working state. Wake on USB requires the data lines to be connected to the system USB host before the system is placed into its

S3 sleep state and remain continuously connected until they are used to wake the system.

The PI5USB2546 supports low and full speed HID (human interface device like mouse/key board) wake function. There are

two scenarios under which wake on mouse are supported by the PI5USB2546. The specific CTL pin changes that the

PI5USB2546 will override are shown below. The information is presented as CTL1, CTL2 and CTL3.The ILIM_SEL pin plays

no role

1.

111 (CDP/SDP2) to 011 (DCP-Auto)

2.

110/010 (SDP1) to 011 (DCP-Auto)