Datasheet

GND
D+
D−
V
BUS
USB Connector
GND
5.0 V
V
BUS
+
–
+
–
2.0 V2.7 V
UDG-12101
GND
D+
D−
V
BUS
USB Connector
GND
5.0 V
V
BUS
+
–
+
–
2.7 V2.0 V
UDG-12102
GND
D+
D−
V
BUS
USB Connector
200 W (max)
GND
5.0 V
V
BUS
UDG-12100
TPS2511
SLUSB18 –JUNE 2012 www.ti.com
The second step, the secondary detection, is necessary for portable equipment to determine between a CDP and
a DCP. The portable device outputs a nominal 0.6 V output on its D- line and reads the voltage input on its D+
line. The portable device concludes it is connected to a CDP if the data line being remains is less than the
nominal data detect voltage of 0.3 V. The portable device concludes it is connected to a DCP if the data line
being read is greater than the nominal data detect voltage of 0.3V and less than 0.8 V.
Dedicated Charging Port (DCP)
A dedicated charging port (DCP) is a downstream port on a device that outputs power through a USB connector,
but is not capable of enumerating a downstream device, which generally allows portable devices to fast charge at
their maximum rated current. A USB charger is a device with a DCP, such as a wall adapter or car power
adapter. A DCP is identified by the electrical characteristics of its data lines. The following DCP identification
circuits are usually used to meet the handshaking detections of different portable devices.
Short the D+ Line to the D– Line
The USB BC1.2 Specification and the Chinese Telecommunications Industry Standard YD/T 1591-2009 define
that the D+ and D– data lines should be shorted together with a maximum series impedance of 200 Ω. This is
shown in Figure 24.
Figure 24. DCP Short Mode
Divider1 (DCP Applying 2.0 V on D+ Line and 2.7 V on D– Line) or Divider2 (DCP Applying 2.7 V on D+
Line and 2.0 V on D– Line)
There are two charging schemes for divider DCP. They are named after Divider1 and Divider2 DCPs that are
shown in Figure 25 and Figure 26. The Divider1 charging scheme is used for 5-W adapters, Divider1 applies 2.0
V to the D+ line and 2.7 V to the D– data line. The Divider2 charging scheme is used for 10-W adapters and
applies 2.7 V on the D+ line and 2.0 V is applied on the D– line.
Figure 25. Divider1 DCP Figure 26. Divider2 DCP
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