SimCom SIM800L User Manual

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SIM800L(MT6261)_Hardware Design_V1.01 33 2016-07-07
changed to high.
URC
The pin is c
hanged to low, and kept low for 120ms when some URCs are reported. Then it is
changed to high. For more details, please refer to document [10].
The behavior of the RI pin is shown in the following figure when the module is used as a receiver.
HIGH
LOW
Idle Ring
Hang up the call
Establish the call
RI
Figure 27: RI behaviour of voice calling as a receiver
HIGH
LOW
Idle
RI
120ms
Receive SMS
URC
Figure 28: RI behaviour of URC or receive SMS
However, if the module is used as caller, the RI will remain high. Please refer to the following figure.
HIGH
LOW
Idle
Ring
Establish
the call
Hang up
the call
Idle
RI
Figure 29: RI behaviour as a caller
4.7. Audio Interfaces
SIM800L provides two analog inputs (MIC1P/1N; MIC2P/2N), which could be used for electret microphone.
The module also provides two analog outputs (SPK1P/1N; SPK2P/2N).
Table 13: Audio interface definition
Pin name Pin number Function
Main
MIC1P
52
Main Audio input positive
MIC1N
12
Main Audio input negative
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SimCom SIM800L Specifications

General

Brand	SimCom
Model	SIM800L
Category	Recording Equipment
Language	English