SIM800C datasheet(29/52 Pages) SIMCOM

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SIM800C_Hardware_Design_V1.02

2015-4-27

HIG H

LO W

IdleR ing

H ang up the call

Establish the call

Figure 25: UART1_RI behaviour of voice calling as a receiver

HIG H

LO W

Idle

120m s

Receive S M S

UR C

Figure 26: UART1_RI behaviour of URC or receive SMS

However, if the module is used as caller, the UART1_RI will remain high. Please refer to the following figure.

HIG H

LO W

Idle

Ring

Establish

the call

H ang up

the call

Idle

Figure 27: UART1_RI behaviour as a caller

4.7. Audio Interfaces

SIM800C provides an analog input (MICP; MICN), which could be used for electret microphone. The module

also provides an analog output (SPKP; SPKN).

Table 12: Audio interface definition

SPKP/SPKN output can directly drive 32Ω receiver.

AT command “AT+CMIC” is used to adjust the input gain level of microphone. AT command “AT+SIDET”

is used to set the side-tone level. In addition, AT command “AT+CLVL” is used to adjust the output gain level.

For more details, please refer to document [1].

Pin name

Pin number

Function

MICP

Audio input positive

MICN

Audio input negative

SPKP

Audio output positive

SPKN

Audio output negative

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