TPS2543-Q1 Datasheet, PDF (22/41 Pages) Texas Instruments – USB Charging Port Controller and Power Switch with Load Detection

TPS2543-Q1
SLVSBW2 – MARCH 2013
Wake on USB Feature (Mouse/Keyboard Wake Feature)
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USB 2.0 Background Information
The TPS2543-Q1 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 TPS2543-Q1 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 TPS2543-Q1 supports low speed HID (human interface device like mouse/key board) wake function only.
There are two scenarios (as listed below) under which wake on HID are supported by the TPS2543-Q1. The
specific CTL pin changes that the TPS2543-Q1 will override are shown below. The information is presented as
CTL1, CTL2, CTL3. The ILIM_SEL pin plays no role
1. 111 (CDP/SDP2) to 011 (DCP-Auto)
2. 010 (SDP1) to 011 (DCP-Auto)
Note:
The 110 (SDP1) to 011 (DCP-Auto) transition is not supported. This is done for practical reasons since the
transition involves changes to two CTL pins. Depending on which CTL pin changes first, the device will see
either a temporary 111 or 010 command. The 010 command is safe but the 111 command will cause an OUT
discharge as the TPS2543-Q1 will instead proceed to the 111 state.
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