Datasheet

2 V
USB
Connector
D -
D +
VBUS
Device Side
D- Out
D+ Out
CDP
Detect
Auto
Detect
2.7 V
Host Side
TPS2543
CDP
Detect
Auto
Detect
D- Out
D+ Out
2 V
USB
Connector
D -
D +
VBUS
Device Side
2.7 V
Host Side
TPS2543
Divider 1/2
D -
D +
From Charging
Peripheral
TPS2543
To USB 2.0 Host
High BW Data Line SW
Controlled by CTL/EN pins
BC1.2 CDP/SDP
BC1.2 DCP
DCP Auto
TPS2543
SLVSBA6 –FEBRUARY 2012 www.ti.com
Figure 29. DCP Divider 1 Scheme
Figure 30. Divider 2 Scheme
Divider 1 voltage configuration is required for 1A (max) iPhone device charging while Divider 2 will allow fast
charging iPAD devices at 2.1A.
DCP Auto Mode
The TPS2543 integrates an auto-detect feature that supports the above DCP schemes. It starts in Divider 1
scheme, if a BC1.2 or YD/T 1591-2009 compliant device is attached, the TPS2543 responds by discharging
OUT, turning back ON the power switch and operating in BC1.2 DCP. It then stays in that mode until the device
releases the data line, in which case it goes back to Divider Mode.
Also, the TPS2543 will automatically switch between the Divider 1 and Divider 2 schemes based on charging
current drawn by the connected device. Initially the device will set the data lines to Divider 1 mode. If charging
current of >750mA is measured by the TPS2543 it switches to Divider 2 scheme and test to see if the peripheral
device will still charge at a high current. If it does then it stays in Divider 2 scheme otherwise it will revert to
Divider 1 scheme.
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Product Folder Link(s): TPS2543