Chapter 9: Breakout Board
Power Configuration
Psion Teklogix Omnii HDK User Manual
131
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:
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”.
Table 9.3 Power Headers J35 Pinout
Pin
Name
Description
1,3,5
GND
Ground
2,4,6
EXP_3V3
3.3 V power
HDK_5V0
HDK_3V3
GROUND
1 3 5
2 4 6
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