User Guide

PAMS
Technical Documentation
RAE-5
4. User Interfaces
Page 4 – 18
Issue 1 04/02
Figure 5. Block diagram of PDA Power Supply
VCC
LCDPWM
DY
V0Y
V5Y
VCCY
FRY
YSCL
XINH
Control ASIC
Flyback Regulator
Swing Mode
Regulator
Data
Synchronisation
The flyback regulator generates a negative bias voltage (Nominally –12V) from
the battery voltage. The output of the flyback generator is temperature compen-
sated and adjusted under software control.
The control ASIC handles the refresh of data to the PDA display panel and the
generation of synchronisation signals for the swing mode regulator.
Antenna connectors and ground plane
The RF–signal from the external antenna connector/switch on KL8 is fed to the
antenna via a coaxial cable that is led through the hinge. The signal is fed to
the antenna through a coaxial connector and an antenna clip which are placed
on the UL2 PWB.
The UL2 PWB includes the separate ground area that is required by the anten-
na.