Nokia 6020b Service Manual
Issue 1 03/2005
COMPANY CONFIDENTIAL
33
Copyright © 2005 Nokia. All Rights Reserved.
RM-31
7 - System Module
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
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.
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 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
TM
IF; Accessory Control Interface (ACI),
Power Out; Stereo audio output and Universal Serial Bus (USB). The USB functionality is not
supported by RM-31. The RM-31 product supports “double mono” on the earpiece lines. The
MBUS function, (included in previous accessory interfaces) is not supported by this interface.
supported by RM-31. The RM-31 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 14:PopPort
bottom connector (charger plug socket & PopPort system con-
nector)
1 2
14
XEA
RRN
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