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There are four LEDs in two series for keyboard backlight.

ASICs

RAP ASIC

RAP is a GSM EDGE chip (modem ASIC) with lots of peripheral features:

• processor subsystem (PSS) that includes ARM926 MCU as a main processor

• DSP and related functions

• ASIC clock and reset control

• MCU peripherals e.g. CBUS IF, USB IF and SIM IF

• DSP peripherals e.g. speech codec

• RF codec

EM ASIC (N2200)

EM ASIC (N2200) includes the following functional blocks:

• Start up logic and reset control

• Charger detection

• Battery voltage monitoring

• 32.768 kHz clock with external crystal

• Real time clock with external backup battery

• SIM card interface

• Stereo audio codecs and amplifiers

• A/D converter

• Regulators

• Vibra interface

• Digital interface (CBUS)

EM ASIC (N2300)

EM ASIC (N2300) is intended for energy management control, supply voltage generation and charge control

of mobile phone.

Device memories

RAPGSM memories NOR flash and SDRAM

Modem memory consists of 128Mbit SDRAM and 256 Mbit NOR flash memory.

Audio concept

Audio HW architecture

The functional core of the audio hardware is built around two ASICs: RAPGSM engine ASIC and the mixed-

signal ASIC Retu.

There are three audio transducers:

• 7x11 mm dynamic earpiece

• one 11x15 mm dynamic speaker

• electret microphone module

Note: The RM-198 can be assembled with or without the HAC (Hearing Aid Coil).

RM-198

Nokia Customer Care System Module

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