Sim2 M80 Dokumentacja Pobierz pdf (Strona 53)

M80 Hardware Design

M80_HD_V1.0 - 53 -

3.10. Audio interfaces

The module provides two analogy input channels and three analogy output channels.

Table 11: Pin definition of Audio interface

AIN1 and AIN2 can be used for input of microphone and line. An electret microphone is usually

used. AIN1 and AIN2 are both differential input channels.

AOUT1 is used for output of the receiver and speaker. This channel is typically used for a receiver

built into a handset. AOUT1 channel is a differential channel. It only supports voice path. If it is

used as a speaker, an amplifier should be employed.

AOUT2 is used for output of earphone and speaker. This channel is typically used with earphone.

AOUT2 is a single-ended channel. SPK2P and AGND can establish a pseudo differential mode. If

customer needs to play Melody or Midi ring tone for incoming call, AOUT2 Channel should

always be used. If it is used as a speaker, an amplifier should be employed also.

AOUT3 is used for loud speaker output as it embedded an amplifier of class AB whose maximum

drive power is 800mW. AOUT3 is a differential channel. Immediately Playing Melody or Midi

ring tone for incoming call is available in AOUT3.

These three audio channels can be swapped by “AT+QAUDCH” command. For more details,

please refer to document [1].

Use AT command “AT+QAUDCH” to select audio channel:

 0--AIN1/AOUT1, the default value is 0.

 1--AIN2/AOUT2

 2--AIN2/AOUT3

Interface

Name

Function

AIN1/AOUT1

MIC1P

Channel one of Microphone positive input

MIC1N

Channel one of Microphone negative input

SPK1P

Channel one of Audio positive output

SPK1N

Channel one of Audio negative output

AIN2/AOUT2

MIC2P

Channel two of Microphone positive input

MIC2N

Channel two of Microphone negative input

SPK2P

Channel two of Audio positive output

AGND

Cooperate with SPK2P

AIN2/AOUT3

LOUDSPKP

Channel three of Audio positive output

LOUDSPKN

Channel three of Audio negative output

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