Headset hook detection interface (XMICN) electrical characteristics
Description
Min
Typ
Max
Unit
Notes
Hook detection
threshold 1
1.25
1.35
1.45
V
Two fixed
thresholds
inside Retu.
Selectable by
SW
Hook detection
threshold 2
0.5
0.6
0.7
V
Hook detection
hysteresis
25
mV
Hook detection
pull ups
1
2
4
uA
Audio signal electrical characteristics
Description
Parameter
Typ
Unit
Notes
XMIC N
Audio in
1
V
pp
DC Offset 2.5-2.78V
XMIC P
Audio in
1
V
pp
DC Offset 2.5-2.78V
HSEAR N
Audio out
1
V
pp
10Ω nominal serial
impedance
HSEAR P
Audio out
1
V
pp
10Ω nominal serial
impedance
HSEAR R N
Audio out
1
V
pp
10Ω nominal serial
impedance
Not connected in
mono
HSEAR R P
Audio out
1
V
pp
10Ω nominal serial
impedance
Not connected in
mono
SIM IF connections
Pin
Signal
I/O
Engine connection
Notes
C1
SIMCLK
Out
Retu
SIM1ClkC
Clock signal to
SIM card
C2
SIMRST
Out
Retu
SIM1Rst
Reset signal to
SIM card
C3
VSIM
Out
Retu
VSIM1
Supply voltage
to SIM card,
1.8V or 3.0V.
C5
SIMDATA
In/Out
Retu
SIM1DaC
Data input /
output
RM-42
Nokia Customer Care
System Module
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Company Confidential
9241872 (Issue 1)
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