Nokia 9000i, Service Manual

Page: 22 / 434

After Sales
Technical Documentation
RAE/RAK–1N
Overview
Page 1– 16
Original, 08/96
Technical Summary
The transceiver electronics consist of the following modules:
– PDA (PIM & extended UI control),
– Radio System (RF + System blocks),
– UIF
– SIM and audio submodule.
The UIF Module is connected to the PDA module with a flex cable and a
connector. The PDA module is connected to the Radio System Module
using a 44 pin board–to–board connector.
The System block (Baseband and RF modules) are interconnected with
PCB wiring and the transceiver is connected to accessories via a bottom
system connector plus an RF connector in the other end of the device. An
IR eye for wireless data exchange locates to the same end as the external
RF connector.
The PDA module provides the hardware platform for the extended UI with
an integrated CPU and peripheral control IC (E3G), memories (DRAM,
Flash), power circuitry (SMPS), IR electronics and external RS buffering.
The PDA power supply generates power for;
– Graphical LCD (22V)
– Basic PDA logic (3.3 V)
– Flash programming (dynamic) (5V)
The System block contains the MCU and DSP environments, System BB
IC (D2CA), memories, audio processing and RF interface hardware (RFI).
On board power supply circuitry delivers operating voltages for both
System and RF blocks.
The general purpose microcontroller, Hitachi H8, communicates with the
DSP, memories and Logic control IC (D2CA) with an 8–bit data bus.
The purpose of the RF block is to receive and demodulate the radio
frequency signal from the base station and to transmit a modulated RF
signal to the base station.