External signals and connections
Table 13 System connector
Signal
From
To
Min
Nom
Max
Condi-tion
Note
XMICP
HS/HF Mic UEMC
Lite
2/60m
V diff
Analog
audio in
Headset Mic bias and
audio signal 2mV
nominal. HF Mic signal
60mV nominal.
Differential symmetric
input.
DC bias
2V2kohm
Accessory detection by
bias loading
XMICN
2/60m
V diff
Ana in / 1k
to GND
Hook interrupt by heavy
bias loading
XEARP
HS/HF
UEMC
Lite
100 mV
diff
Ana in
Quasi-differential DC-
coupled earpiece/HF
amplifier signal to
accessory. DC biased to
0.8V
XEARN
EAR/
Amp.
INT
HEADINT
Switch
UEMC
Lite
0/2.7V
Dig in
HS interrupt from bottom
connector switch when
plug inserted.
VCHARIN
Charger
UEMC
Lite
11.1Vp
eak
16.9
Vpeak
Standard
Vch from Charger
Connector, max 20V
7.9
VRMS
1.0
Apeak
7.0
VRMS
8.4
VRMS
9.2
VRMS
Fast charger
850 mA
GND
GND
GND from/to Charger
connector
Battery connector
Table 14 Battery IF
Signal
From
To
Min
Nom
Max
Note
GND
Global
Batt (-)
Global GND
VBAT
Batt (+)
3.1
5.1
Battery Voltage
RM-298; RM-299
System Module
Page 6 –18
COMPANY CONFIDENTIAL
Issue 1
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