Chapter 7: Docking Stations
Docking Station USB Connectors
108
Psion Teklogix Omnii HDK User Manual
Figure 7.2 USB MicroB Connector
USB 2.0 Type A Interface
The USB Type A connector on the desktop docking station is a standard USB 2.0 compliant
interface that allows Omnii to connect to USB client devices. It supports low speed (1.5 Mbps)
and full speed (12 Mbps) communications.
In addition, the Type A port provides VBUS power to a maximum of 500 mA. If a power adaptor
is connected to the docking station, it provides the VBUS power; otherwise, Omnii provides the
power from the main battery. If there is no Omnii docked in the docking station, no power is
provided to the VBUS power line, even if a power adaptor is connected.
Figure 7.3 USB Host Type A Connector
Table 7.1 Pinout Of The USB MicroB Connector
Pin
Name
Description
Direction
1
VBUS
DC current from external host
Input from connected external device.
2
USB_D-
USB Client D-
Bidirectional (half-duplex).
3
USB_D+
USB Client D+
4
ID
ID connected plug (Only microB
plug is supported in the desktop
docking stations.)
5
Ground
Table 7.2 Pinout Of The USB Host Connector
Pin
Name
Description
Direction
1
VBUS
DC supply from Omnii.
Current 500 mA maximum.
Voltage minimum 4.35 V.
Voltage maximum 5.25 V.
Output to connected external device.
2
USB_H4_D-
USB Host port 4 D-
Bidirectional (half-duplex).
3
U
USB Host port 4 D+
4
Ground
Pin 1
Pin 2
Pin 3
Pin 4
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