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
22Ω nominal serial
impedance
HSEAR P Audio out 1 V
pp
22Ω nominal serial
impedance
HSEAR R N Audio out 1 V
pp
22Ω nominal serial
impedance
Not connected in
mono
HSEAR R P Audio out 1 V
pp
22Ω nominal serial
impedance
Not connected in
mono
MicroSD IF electrical signal characteristics
Description Parameter Min Max Unit Notes
MicroSD point of view
High-level output
voltage
VOH V IOH = ±10uA
(VMMC = 2.8V) 0.75xVMMC VMMC+0.3
Low-level output
voltage
VOL 0.125xVMMC V IOL = ±10 uA
(VMMC = 2.8V) -0.3
RM-170; RM-171
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