User Guide

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 N2200.
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 VSIM Out EM ASIC N2200 VSIM1 Supply voltage
to SIM card,
1.8V or 3.0V.
C2 SIMRST Out EM ASIC N2200 SIM1Rst Reset signal to
SIM card
C3 SIMCLK Out EM ASIC N2200 SIM1ClkC Clock signal to
SIM card
C5 GND - GND Ground
RM-100
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