External Signals And Connections - Nokia RM-512 Service Manual

External signals and connections

Signal From
XMICP HS/HF Mic
XMICN
XEARP HS/HF
XEARN EAR/
Amp.
INT Switch
HEADINT
Page 6 –16
Figure 116 SIM interface block diagram
Table 11 System connector
To Min Nom
Liteplu 2/60m
s V diff
2/60m
V diff
Liteplu 100 mV
s diff
Liteplu 0/2.7V
s
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RM-512; RM-513; RM-514; RM-515; RM-543
Max Condi-tion
Analog
audio in
DC bias
2V2kohm
Ana in / 1k
to GND
Ana in
Dig in
System Module
Note
Headset Mic bias and
audio signal 2mV
nominal. HF Mic signal
60mV nominal.
Differential symmetric
input.
Accessory detection by
bias loading
Hook interrupt by heavy
bias loading
Quasi-differential DC-
coupled earpiece/HF
amplifier signal to
accessory. DC biased to
0.8V
HS interrupt from bottom
connector switch when
plug inserted.
Issue 2