SIM900 データシートの表示（PDF） - Unspecified

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SIM900

SIM900 Quad-band/SIM900A Dual-band GSM/GPRS module

Unspecified 

SIM900 Hardware Design

SIM_PRESE I

NCE

SIM detect

VILmax=0.15 *VDD_EXT

VIHmin=0.85*VDD_EXT

VILmin= 0V

VIHmax= VDD_EXT

ADC

PIN NAME I/O

ADC

I

External Reset

PIN NAME I/O

NRESET

I

DESCRIPTION

DC CHARACTERISTICS

General purpose analog to Input voltage range: 0V ~ 3V

digital converter.

DESCRIPTION

DC CHARACTERISTICS

External reset input(Active VILmax=0.15 *VDD_EXT

low)

VIHmin=0.85*VDD_EXT

VILmin= 0V

VIHmax= VDD_EXT

Pulse Width Modulation

PIN NAME I/O DESCRIPTION

PWM1

O PWM Output

PWM2

O PWM Output

DC CHARACTERISTICS

VOHmin= VDD_EXT-0.1V

VOLmax=0.1V

VOHmax= VDD_EXT

VOLmin=0

holder.

If unused keep

open

COMMENT

If unused keep

open

COMMENT

If unused keep

open

COMMENT

If unused keep

open

3.2 Operating Modes

The table below briefly summarizes the various operating modes referred to in the following chapters.

Table 6: Overview of operating modes

Mode

Normal

operation

Function

GSM/GPRS

SLEEP

GSM IDLE

SIM900_HD_V1.01

Module will automatically go into SLEEP mode if DTR is set to high level

and there is no on air and no hardware interrupt (such as GPIO interrupt or

data on serial port).

In this case, the current consumption of module will reduce to the minimal

level.

In SLEEP mode, the module can still receive paging message and SMS

from the system normally.

Software is active. Module has registered to the GSM network, and the

module is ready to send and receive.

20

26.12.2009

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