Psion Teklogix OMNii HDK XT10, Руководство пользователя

Страница: 139 / 192

Chapter 9: Breakout Board
Power Configuration
Psion Teklogix Omnii HDK User Manual 129
3. Install eight M3x6 T10 Torx screws to secure the back cover to the main housing. Torque
the screws to 5.0 in-lb (0.56 N-m) in the sequence indicated below to ensure a consistent
seal around the perimeter.
4. Install the two T6 Torx screws in the front cover above the display, and torque to 2.5 in-lb
(0.28 N-m).
5. If a pod expansion module is required on the expansion back cover, attach it now:
a. Connect the flex cable from the pod opening to the device mounted in the pod.
b. Seat the pod in place on the back cover.
c. Install the four T10 Torx screws to secure the pod to the back cover, and torque to 5 in-lb
(0.56 N-m).
9.5 Power Configuration
Power from Omnii can be accessed in several ways on the breakout board. Power convertors on
the breakout board convert VSYS power from Omnii to 3.3 V and 5 V power lines. These lines in
turn provide power to circuits for testing GPIO, UART and USB devices; to power headers J34
(HDK_3V3) and J36 (HDK_5V0); and to the power scratch pad grid.
3.3 V power is also derived from the EXP_3V3 pin on Omnii and supplied to the DE9 RS-232
port (J30), to power header J35 (EXP_3V3), and to header J39 for programming the onboard 1-
wire EEPROM.
Access VSYS Power
VSYS power is required to test devices on the GPIO, UART and USB interfaces. It must also be
enabled to access power from power headers J34 and J36, or from the scratch pad grid.
1. Install a jumper across the pins of jumper header J38 to enable VSYS power from Omnii.
LED DS12 illuminates to indicate VSYS power is enabled.
2. Install a jumper across the pins of jumper header J3 to enable the 5 V power supply.
LED DS2 illuminates to indicate the 5 V (HDK_5V0) power supply is enabled.
3. Install a jumper across the pins of jumper header J37 to enable the 3.3 V power supply.
LED DS11 illuminates to indicate the 3.3 V (HDK_3V3) power supply is enabled.
1
2
3
4
8
6
7
5