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M12 Hardware Design

M12_HD_V3.3 - 20 -

Module status indication

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

STATUS

54

O

Used to indicate

module’s operating

status. High level

indicates module

power-on and low

level indicates

power-down.

VOLmax=

0.15×VDD_EXT

VOHmin=

0.85×VDD_EXT

If unused, keep

this pin open.

Audio interfaces

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

MIC1P

MIC1N

23

24

I

Positive and

negative

voice-band input.

For Audio DC

characteristics refer to

Chapter 3.9.

If unused, keep

these pins open.

MIC2P

MIC2N

25

26

I

Auxiliary positive

and negative

voice-band input.

SPK1P

SPK1N

22

21

O

Positive and

negative

voice-band output.

SPK2P

20

O

Auxiliary positive

voice-band output.

AGND

19

Analog ground.

Separate ground

connection for

external audio

circuits.

General purpose input/output

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

GPIO1

38

I/O

Normal

input/output

port/Keypad

interface

VILmin=-0.3V

VILmax=

0.25×VDD_EXT

VIHmin=

0.75×VDD_EXT

VIHmax=

VDD_EXT+0.3

VOLmax=

0.15×VDD_EXT

VOHmin=

0.85×VDD_EXT

If unused, keep

these pins open.

GPIO0

64

I/O

Normal

input/output port

NETLIGHT

6

O

Network status

indication

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