Smart Machine Smart Decision
SIM800_Hardware Design_V1.10 34 2018-08-13
HIGH
LOW
Idle Ring
Hang up the call
Establish the call
RI
Figure 27: RI behaviour of data 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
SIM800 provides one analog input, which could be used for electret microphone. The module also provides one
analog output. The output can directly drive 32Ω receiver.
Table 12: Audio interface definition
Audio channel
MICN 20 Audio input negative
SPKP 21 Audio output positive
SPKN 22 Audio output negative
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