Display and keypad backlight
There are two sets of LEDs illuminating the display and the keypads:
• Display LEDs, 4pcs
• Main keypad on PWB, 4 pcs, white colour
All sets share the same driver. None of the keypads can be illuminated without the LCD backlight being turned
on.
ASICs
RAP ASIC
RAP ASIC is a 3G Radio Application Processor. RapidoYawe is the processor used in RM-243. Rapido is the
processor unit, Yawe chip contains HSDPA logic, and it is stacked on the Rapido chip. Together they are called
RapidoYawe.
EM ASIC N2300 (Betty)
The EM ASIC (N2300) includes the following functional blocks:
• Core supply generation
• Charge control circuitry
• Level shifter and regulator for USB/FBUS
• Current gauge for battery current measuring
• LED driver for backlights
• Digital interface (CBUS)
EM ASIC N2200 (Avilma)
The EM ASIC (N2200) includes the following functional blocks:
• Start up logic and reset control
• Charger detection
• Battery voltage monitoring
• 32.768kHz 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)
EMC ASIP (Appcation Specified Integrated Passive) have been integrated inside the ASIC. It includes biasing
passives for microphone , EMC filter for SIM, microphones etc.
Device memories
RAP memories NOR flash and SDRAM
Modem memory consists of 128 Mbit SDRAM and 128 Mbit NOR flash memories.
RM-243
System Module and User Interface
Page 6 –18 COMPANY CONFIDENTIAL Issue 1
Copyright © 2007 Nokia. All rights reserved.
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