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RM-51
System module and user interface
BB user interface
UI-module interface
The UI module holds the display, the keyboard, the rocker switch and the camera.
Bluetooth
Bluetooth provides a fully digital link for communication between a master unit and one or more slave units.
The system provides a radio link that offers a high degree of flexibility to support various applications and
product scenarios. Data and control interface for a low power RF module is provided. Data rate is regulated
between the master and the slave.
The bluetooth module used in this phone is BC02. The ASIC and components are placed on the top side of the
1KMA system module, underneath the shield can UPP_WD2, next to UEM D250.
USB
USB provides a wired connectivity between host PC and peripheral devices. The phone complies with USB 2.0,
supporting data transfer at full-speed (max. 12Mbps). The USB functionality is implemented by a newly
developed USB interface device, Kaede (D440), which is connected to UPP_WD2 via flash memory interfaces. A
6MHz ceramic resonator, Ceralock (B440), is used for USB clock generation.
SIM interface
The SIM interface is located in two chips (UPP_WD2 and UEMEK). In UEMEK there is support only for one SIM card.
The interfaces support both 1.8 V and 3.0 V SIM cards. Adjustable SIM regulator (1.8V/3.0V) is located in UEMEK
and can be controlled by the software.
The data communication between the card and the mobile device is asynchronous half duplex. The clock
supplied to the card is 3.25 MHz. The data baud rate is the SIM card clock frequency divided by 372 (by default),
64, 32 or 16.
IrDA interface
This mobile device supports data connectivity via the Infra Red (IR) link. The IR interface is integrated into the
UPP_WD2 and the main external component is the IR module. The data rates supported are up to 115.2 kbit/s.
The logics section is powered by 1V8 and VIO while the transmitter LED is powered directly by the battery via
a power limiting resistor.
The maximum distance in the lightning configuration is approximately 20 centimetres (30 cm used with an
accompanying 1 m device).
MMC interface
The MMC interface consists of a block in UPP_WD2 plus a level shifting device known as "Lester". The level shifter
is inserted between the UPP_WD2 and the MMC reader, and shifts from 1.8 V logical level at UPP to 2.85V logical
level at the MMC reader.
The MMC interface comprises 3 lines clock, data and command and runs at 10.26 MHz.
TM
Pop-Port
The ACI bus is level-shifted between the accessory part and the BSI/DBI port of the UEMEK.
9238460 (Issue 1)
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
Nokia Customer Care
Page 9–11
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Table of Contents
Troubleshooting
