User Guide

Issue 1 04/2005 COMPANY CONFIDENTIAL 27

RM-94

7 - System Module Nokia Customer Care

Interfaces

■ BB-RF interface

The interface between the Baseband and RF can be divided into three categories:

• The digital interface from UPP to the RF ASIC (Helgo). The serial digital interface

is used to control the operation of different blocks in the RF ASICs

• The analogue interface between Baseband and RF. The analogue interface con-

sists of Tx and Rx converter signals. The power amplifier control signals TXC and

AFC also come from the UEMEK.

• Reference clock interface between Helgo and UPP which supplies the 26 MHz

system clock for UPP.

■ System connector interface

System connector

The system connector is a galvanic interface between phone and accessory.

Four new functions are introduced with the PopPort

IF; Accessory Control Interface (ACI),

Power Out; Stereo audio output and Universal Serial Bus (USB). The USB functionality is not

supported by RM-94. The RM-94 product supports “double mono” on the earpiece lines. The

MBUS function, (included in previous accessory interfaces) is not supported by this interface.

The connector is not backward compatible with DCT1, DCT2 and DCT3 accessory interfaces.

Figure 12:PopPort™ bottom connector (charger plug socket & PopPort™ system con-

nector)

1 2 14

XEARRN

XEARRP

Fbus SB D+ _RX / U

USB

Vbus

Vout

ACI

Charge

Shielding GND

Charge GND

Data GND

XMICP

XEARN

XEARP

Shielding GND

XMICN

Fbus_Tx / USB D-

Charge

Charge GND

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