Nokia 9000i, Service Manual

Page: 117 / 434

After Sales
Technical Documentation
RAE/RAK–1N
PDA Hardware
Page 6 – 5
Original, 08/96
Introduction
This chapter describes the PDA system hardware used in the NOKIA
9000 communicator. The PDA module is used to run all applications that
utilise the bigger (640x200) LCD screen.
Technical Summary
Table 1. List of functional blocks on PDA module
Name of functional
block
Function
PROCU Execution and interface unit for PDA
PDAPWRU Power supply unit
SIRU Serial communication and Infrared Unit
EMIU EMI supressing Unit
Most of the engine functionality is integrated on a chip that combines a
CPU core and all needed peripherals; this chip and all other PDA module
circuitry are mounted on a single multilayer printed circuit board. The
chassis of the NOKIA 9000 communicator separates the CMT and PDA
modules and also protects PDA circuits from EMI.
The components of the PDA system hardware are surface mounted
soldered using reflow. The bottom connector (system connector) carries
two optional through hole pins which might prove useful i.e., soldered by
hand, if so required.
All PDA module components are located to one side of the PCB; the other
side of the PCB is used for QWERTY keypad wiring matrix. The
connection to the CMT module is made using a board to board connector
and the connections from CMT to the phone User Interface module (UIF)
are made through the PDA module. The connections to the PDALCD
module and phone user interface module excluding audio, SIM card
holder, buzzer, and call LED (UIF) are made using a flex cable.
The CMT module controls the battery charging via system connector on
PDA. Test pads located to the PCB under the battery pack are for CMT
flash loading and fieldtest purposes.