Eddy Wireless SD Cards Series Spezifikationen PDF herunterladen (Seite 46)

M12 Hardware Design

M12_HD_V3.3 - 45 -

GND

TO PC serial port

SP3238

GND

T5OUT

/SHUTDOWN

V+

GND

V-

VCC

T4OUT

T2OUT

T3OUT

T1OUT

R3IN

R2IN

R1IN

/STATUS

ONLINE

R1OUT

R2OUT

R3OUT

/R1OUT

GND

T5IN

T4IN

T3IN

T2IN

T1IN

C2+

C2-

C1-

C1+

MODULE

RXD

DTR

RTS

CTS

TXD

DCD

Figure 26: RS232 level match circuit

3.9. Audio interfaces

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

Table 10: Pin definition of Audio interface

Interface

Name

Function

(AIN1/AOUT1)

MIC1P

Microphone1 input +

MIC1N

Microphone1 input -

SPK1P

Audio1 output+

SPK1N

Audio1 output-

(AIN2/AOUT2)

MIC2P

Microphone2 input +

MIC2N

Microphone2 input -

SPK2P

Audio2 output+

AGND

It is suggested AGND is used in audio

circuit. Do not connect it to digital

ground in host PCB which could produce

TDD noise.

Quectel

Confidential

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Quectel Cellular Engine 1
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