Datasheet

TPS2511

USB-A

EN Switch

Power

Supply

+5 V

GND

VBUS

D-

D+

Sense

Feedback

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EVM Block Diagram

3 EVM Block Diagram

Figure 1. TPS2511EVM-141 EVM Block Diagram

4 Glossary of Terms

• Charging Downstream Port (CDP)

– A downstream port that complies with the USB 2.0 definition of a host or a hub and additionally

defines a handshake on DP and DM to identify a BC 1.1 compliant host to a BC 1.1 compliant

portable device.

– BC 1.1 allows a high-speed portable device to draw 900 mA and a low speed or full speed device

to draw 1500 mA.

– BC 1.2 intention is to allow all devices to draw 1500 mA.

– BC 1.2 corrects BC 1.1 to ensure USB host provides 5 V at > 1500 mA.

• Standard Downstream Port (SDP)

– USB 2.0 defined port currently adopted by most USB ports.

– Portable device is allowed to draw 100 mA initially and request additional current over USB

communications in 100-mA steps up to a maximum of 500 mA.

– USB host required to provide at least 500 mA at 5 V.

– Portable device must draw less than 2.5 mA when in USB suspend due to the absence of USB

communications.

• Dedicated Charging Port (DCP) as defined in BC 1.1

– BC 1.1 defines a dedicated charging port as a downstream port on a device that outputs power

through a USB connector, but is not capable of enumerating a downstream device.

– Wall adapter must source between 500 mA and 1500 mA.

– Portable device may attempt to draw 1800 mA in order to force the wall adapter into constant-

current mode.

– BC 1.2 intention is to allow DCP to current limit above 1800 mA.

• YD and T 1591-2006, updated 2009

– PROC Telecommunications Standard .

– Defines wall-adapter requirements.

– Rated current between 500 mA to 1500 mA with defined I-V curve.

SLUU945–June 2012 TPS2511EVM-141 USB Dedicated Charging Port Controller and Power

Switch Evaluation Module

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