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Figure 9.7 Power Scratch Pad Contact Points
Access Direct 3.3V Power
No action is required to configure the breakout board to access the 3.3 V power from the
EXP_3V3 line. When the board is connected to Omnii, power is automatically supplied directly to
the DE9 RS-232 connector (J30), the EXP_3V3 power header (J35), and the 1-wire EEPROM
header (J39).
Power header J35 can be used to access the 3.3 V power from EXP_3V3 directly. To access power
from this header, construct a wire harness with the following pinout:
Table 9.3 Power Headers J35 Pinout
Pin
Name
1,3,5
GND
2,4,6
EXP_3V3
Figure 9.8 Power Header J35 Pin Order
For further information on working with RS-232 devices, see Section 9.7 on page 134. For more
information on programming the 1-wire EEPROM, see Chapter 8: "EEPROM Specifications".
HDK_5V0
GROUND
HDK_3V3
Ground
3.3 V power
2
4
6
1
3
5
Chapter 9: Breakout Board
Power Configuration
Description
Psion Teklogix Omnii HDK User Manual
131
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