User Guide

RH-37

System Module Nokia Customer Care

Page 36 Nokia Corporation Issue 1 07/04

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 function-

ality is not supported by RH-37. The RH-37 product supports “double mono” on the ear-

piece 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 inter-

faces.

Figure 17: PopPort bottom connector (charger plug socket & PopPort system connector)

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

Figure 19. Pop-Port Bottom Connector (Charger plug socket & Pop-Port System Connector)