CBUS interface
CBUS is a "main" system control bus in BB5. RAPIDO controls the functionality of EM ASIC (N2200) and EM ASIC
(N2300) ASICs with CBUS.
CBUS is a four-wire half-duplex master-slave interface. In BB5 CBUS clock frequency is 2.4 MHz.
FBUS
USB and FBUS have multiplexed interface between EM ASIC (2300) and RAPIDO.
ECI interface
The ECI (Enhancement Control Interface) is a point-to-point, bi-directional, single line serial bus.
The purpose of the ECI is to identify and authenticate the accessory, and to act as a data bus (intended for
control purposes) between the phone and the accessory .
Charger interface
Charging control and charge switch are situated in EM ASIC (N2300).
If the temperature rises too high and the thermal protection is activated, EM ASIC (N2300) goes to protection
mode.
SIM interface
The device has one SIM (Subscriber Identification Module) interface. It is only accessible if battery is removed.
The SIM interface consists of an internal interface between RAPIDO and EM ASIC (N2200), and of an external
interface between N2200 and SIM contacts.
The SIM IF is shown in the following figure:
Figure 58 SIM interface
The EM ASIC handles the detection of the SIM card. The detection method is based in the BSI line. Because of
the location of the SIM card, removing the battery causes a quick power down of the SIM IF.
RM-179; RM-223
System Module and User Interface
Page 6 –18 COMPANY CONFIDENTIAL Issue 1
Copyright © 2007 Nokia. All rights reserved.
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General
Weight and Dimensions
