Chapter 9: Breakout Board
1-Wire EEPROM Programming
Psion Teklogix Omnii HDK User Manual
139
Figure 9.19 USB Header J14 Pin Order
Figure 9.20 USB Header J40 Pin Order
9.9
1-Wire EEPROM Programming
This section describes how to access and program the 1-wire EEPROM on the breakout board to
identify itself as a specific device model to Omnii.
9.9.1
1-Wire EEPROM Power
Power for the 1-wire EEPROM can be provided by the EXP_3V3 power line from Omnii, or from
an external device.
To take power from the EXP_3V3 power line, install a jumper across pins 1 and 2 of the
EEPROM header J39. As long as the breakout board is connected to Omnii, power will be
available across these pins.
To power the EEPROM from an external device, construct a cable to connect to EEPROM header
J39 with the following pinout:
5
SHL1 (J40)
not connected (J14)
Ground (shield)
6
SHL2 (J40)
not connected (J14)
Ground (shield)
Table 9.12 USB Headers J14 and J40 Pinout
Pin
Name
Description
1 2 3 4 5 6
1 2 3 4
Table 9.13 1-Wire EEPROM External Device Cable Pinout
Pin
Description
1
No connection
2
No connection
3
External 3.3 V power supply
4
1-Wire EEPROM data
5
Ground
6
No connection
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