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Elektronik GmbH USB hub 3.0 6-Port, 2 Control Inputs Manual
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Input
5.6. Function of the USB Ports
Operating Modes 5.6.1.
The USB hub provides six high - speed - capable USB 3.0 ports. Each port can be configured to one of four modes.
These four modes are:
1. Standard port (SDP):
If the maximum current is exceeded, the port shuts off.
2. Charge - capable port (CDP):
Like a standard port, but it announces itself to the connected USB device as a charge - capable USB port
according to the USB battery charging specification V1.2 (USB-IF BC1.2 CDP).
3. Dedicated charging port (DCP BC1.2):
The port announces itself to the connected USB device as a dedicated charging port according to the USB
battery charging specification V1.2 (USB-IF BC1.2 DCP). The current is limited to the maximum possible
value. In this mode, no USB communication is possible with the connected device!
4. Charger - emulation:
The port attempts to negotiate a charging protocol with the connected device. To do this, it tries different
variants one after the other, including YD/T-1591 (2009) and variants compatible with many portable
devices from Apple
®
and RIM
®
. The current is limited to the maximum possible value. In this mode, no USB
communication is possible with the connected device!
Dedicated charging port connection and charger emulation can also be active without a host connected
(operation as a standalone charger).
Due to the many charging schemes
– some of which are manufacturer - specific – there can be no guarantee
that battery charging will succeed with a particular mobile device and that no damage can result!
Connection Detection 5.6.2.
The USB ports have a function to detect when a USB device is connected. This also works for connected devices
that only use the power from the connection (such as USB fans or reading lights). Connection detection can be
disabled individually for each port if the small test current should lead to unexpected problems.
Some USB devices that have their own power supply draw very little power from the USB port. This type of
device can consequently not be detected and the USB port will not be fully enabled. In this case, connection
detection must be disabled for this port.
In CDP mode, it may be that the connection detects a device, but does not detect when it is disconnected.
This has no effect on the other functions of the USB hub, however. Connecting a normal USB device or
turning the port on and off will reset connection detection again.
3,3V
~10k
Ω
Figure 4: Draft for Pin Assignment