Signal name
From
To
Description
ARMIO4
D4800
N1471, V1472
Flash mode enable test
signal (only test use)
VBAT
Battery
N1471
Battery nominal voltage
STROBE
Camera
N1471, V1472
Flash light enable signal
from back camera
Table 29 Flash LED interface electrical characteristics
Description
Parameter
Min
Typ
Max
Unit
GPIO28
GPIO output
1.72
1.8
1.92
V
ARMIO4
GPIO output
1.72
1.8
1.92
V
STROBE
Strobe signal
output
2
-
2.5
V
Slider switch electrical characteristics
Signal name
From
To
Low value
High value
Description
GPIO53
Application
processor
S5202
160 mV
1.8 V
Slider switch
cover status
signal.
Back-up battery interface connections and electrical characteristics
Table 30 Back-up battery connections
Pin name
I/O
Connection
Notes
L2207,
VBack
->
N2200,
VBack
Back-up battery G2200 is
connected to N2200 via coil
Table 31 Back-up battery electrical characteristics
Description Parameter
Min
Typ
Max
Unit
Back-Up
Battery
Voltage
Vback
0
2.5
2.7
V
RF description
RF introduction
The RF is controlled by digital baseband circuitry via a serial bus (RFBus). The RFBus is for mode selection,
frequency synthesizer control, RX AGC setting, RF regulator control, TX power control loop and PA bias control.
In addition to RFBus there are also several other interface signals coming from BB. TX power control (TXC),
VCTCXO frequency control (AFC) and some other control signals (voltage and current references, WCDMA TX
power detection, PA combination detection).
RM-132; RM-133
System Module
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 9 –33
Copyright © 2006 Nokia. All rights reserved.
