Slider Switch Electrical Characteristics; Back-Up Battery Interface Connections And Electrical Characteristics; Rf Description; Receiver - Nokia N72 Service Manual

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Description
GPIO28 GPIO output
ARMIO4 GPIO output
STROBE Strobe signal
output

Slider switch electrical characteristics

Signal name
GPIO53 Application
processor

Back-up battery interface connections and electrical characteristics

Pin name I/O
L2207, ->
VBack
Description Parameter
Back-Up Vback
Battery
Voltage

RF description

Receiver

Introduction to receiver functionality

Receiver functions are implemented in an RF ASIC.
The receiver is a linear direct conversion receiver consisting of separate front ends (LNA (Low Noise Amplifier)
and demodulator) for each supported system. After the demodulators, the signal paths are combined to one
common BB path.

GSM receiver

As GSM Rx branches are functionally identical, the following description is applicable to all of them.
The received signal goes from the GSM antenna to the antenna switch module. The switch module contains
PIN diode switches for a band and Rx/Tx selection and also Rx SAW filters.
The antenna switch module is followed by integrated LNAs (Low Noise Amplifier) residing in an RF ASIC.
The LNAs are followed by demodulators which downconvert the signal to baseband I and Q signals. The
channel select filter is set to 115 kHz.
Page 9 –44
Table 33 Flash LED interface electrical characteristics
Parameter
1.72
1.72
2
From
S5202
Table 34 Back-up battery connections
Connection
N2200,
VBack
Table 35 Back-up battery electrical characteristics
Min
0
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Min Typ
1.8
1.8
-
To Low value
160 mV
Notes
Back-up battery G2200 is
connected to N2200 via coil
Typ Max
2.5 2.7
System Module
Max
1.92 V
1.92 V
2.5 V
High value Description
1.8 V Slider switch
cover status
signal.
Unit
V
RM-180
Unit
Issue 1