Chapter 9: Breakout Board
USB Devices
138
Psion Teklogix Omnii HDK User Manual
The 6-pin in-line custom UART connector (J30) has the following pinout:
Figure 9.18 UART Header J11 Pin Order
9.8
USB Devices
This section describes how to use the breakout board to test USB devices.
9.8.1
USB Power
Power for USB devices is provided by the VSYS power from Omnii. Power converters on the
breakout board split the VSYS power into 3.3 V (HDK_3V3) and 5 V (HDK_5V0) lines.
The USB headers on the breakout board require power only from the 5 V line. Install jumpers
across the pins of jumper headers J38 and J3 to enable this power line (see Section 9.5 on
page 129 for more details).
9.8.2
USB Data Pins
The breakout board supplies two headers for connecting to USB devices: J40 is a standard Type A
USB port, and J14 is a 6-pin in-line connector. The two headers are not independent and cannot be
used to connect to two different USB devices simultaneously.
Table 9.11 UART Header J11 Pinout
Pin
Name
Description
1
HDK_VDD
UART 3.3 V or 5 V power
2
UART_RXD
Received data
3
UART_TXD
Transmitted data
4
UART_RTS
Request to send
5
UART_CTS
Clear to send
6
GND
Ground
1 2 3 4 5 6
Table 9.12 USB Headers J14 and J40 Pinout
Pin
Name
Description
1
VBUS
USB 5 V power
2
D-
USB host D-
3
D+
USB host D+
4
GND
Ground
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