Eddy Wireless SD Cards Series Especificaciones descargar pdf (Pagina 20)

M12 Hardware Design

M12_HD_V3.3 - 19 -

rises to 1.6A.

VRTC

16

I/O

Power supply for

RTC when VBAT

is not supplied.

Charging for

backup battery or

golden capacitor

when the VBAT is

supplied.

VImax=3.3V

VImin=1.5V

VInorm=2.8V

VOmax=2.85V

VOmin=2.6V

VOnorm=2.8V

Iout(max)= 1mA

Iin=2.6~5 uA

Recommended to

connect to a

backup battery or a

golden capacitor.

VDD_EXT

7

O

Supply 2.8V

voltage for

external circuit.

Vmax=2.9V

Vmin=2.7V

Vnorm=2.8V

Imax=20mA

1. If unused, keep

this pin open.

2. Recommended

to add a 2.2~4.7uF

bypass capacitor,

when using for

power supply.

GND

8,42,

44~49

Digital ground

Turn on /off

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

PWRKEY

18

I

Power on/off key.

PWRKEY should

be pulled down for

a moment to turn

on or off the

system.

VILmax=0.1×VBAT

VIHmin=0.6×VBAT

VImax=VBAT

Pulled up to VBAT

internally.

Emergency shutdown

PIN NAME

PIN

NO.

I/O

DESCRIPTION

DC

CHARACTERISTICS

COMMENT

EMERG_

OFF

17

I

Emergency off.

Pulled down for at

least 20ms, the

module will be

turned off in case

of emergency. Use

it only when

normal shutdown

through PWRKEY

or AT command

cannot perform

well.

VILmax=0.4V

VIHmin=2.2V

V

open

max=2.8V

Open

drain/collector

driver required in

cellular device

application.

If unused, keep

this pin open.

Quectel

Confidential

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 75 76

Quectel Cellular Engine 1
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