MEIG SLM770A - 3.16 Analog Audio Interface

SLM770A Module Hardware Design Manual
MeiG Smart Technology Co., Ltd 77/77
Module
USB_BOOT
TVS
Test point
Close to module
10K
VDD_EXT
Figure 22 USB_BOOT interface reference circuit
Note:
1. Do not pull the USB_BOOT to 1.8V before powering on the VBAT module.
2. During normal startup, USB_BOOT is open without pulling up or down.
3.16 Analog audio interface
The module provides 1 analog audio input channel and 1 analog audio output channel, and the pin
definition is shown in the following table:
Table 21 Analog audio interface definition
Channel
Item
Pin No.
Description
I/O
AIN
MICBIAS
140
Microphone bias voltage
PO
MIC_P
125
Microphone input channel (+)
AI
MIC_N
126
Microphone input channel (-)
AI
AOUT
SPK_P
124
Analog audio differential output channel (+)
AO
SPK_N
123
Analog audio differential output channel (-)
AO
⚫ AIN channel is a differential input used for microphone input