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RM-25
System module
ZOCUS
The ZOCUS device is a current sensor used for the battery bar display and for determining whether the phone
is in a high current consuming mode. The ZOCUS device measures the voltage drop across a sense resistor in
the battery voltage line. This sense resistor is formed from a PWB track and is on an internal layer of the PWB.
The sense resistor must be located close to the battery terminals so that all of the phones current flow through
it. The nominal value of the sense resistor is 3.0m-ohm. ZOCUS reports the current measurement to UPP_WD2
via the Cbus interface.
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.
USB
USB provides a wired connectivity between host PC and peripheral devices. RM-25 complies with USB 2.0,
supporting data transfer at full-speed (max. 12Mbps). The USB functionality of RM-25 is implemented by a newly
developed USB interface device, Kaede (B440), which is connected to UPP_WD2 via flash memory interfaces. A
6MHz ceramic resonator, Ceralock (D440), is used for USB clock generation.
SIM interface
The SIM interface is located in two chips (UPP_WD2 and UEME). In UEME there is support only for one SIM card.
The interfaces support both 1.8 V and 3 V SIM cards. Adjustable SIM regulator (1.8V/3.0V) is located in UEME and
can be controlled by SW.
The data communication between the card and the phone is asynchronous half duplex. The clock supplied to
the card is 3.25 MHz. The data baudrate is SIM card clock frequency divided by 372 (by default), 64, 32 or 16.
IrDA interface
RM-25 supports data connectivity via the Infra Red 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 kbits/s.
The logics section is powered by 1V8, 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" and an EMC
protection ASIP. The MMC interface comprises 3 lines clock, data and command and runs at 10.26 MHz. The Lester
device also incorporates a 2.85V regulator to power the MMC card.
TM
Pop-Port
The ACI bus is level-shifted between the accessory part and the BSI/DBI port of the UEME.
9235618 (Issue 2)
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
Nokia Customer Care
Page 9–11
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