SIM Tech SIMCom SIM800 User Manual

Smart Machine Smart Decision
SIM800_Hardware Design_V1.09 12 2016-06-30
Table 2: Coding schemes and maximum net data rates over air interface
Coding scheme
1 timeslot
2 timeslot
4 timeslot
CS-1
9.05kbps
18.1kbps
36.2kbps
CS-2
13.4kbps
26.8kbps
53.6kbps
CS-3
15.6kbps
31.2kbps
62.4kbps
CS-4
21.4kbps
42.8kbps
85.6kbps
2.2. Operating Modes
The table below summarizes the various operating modes of SIM800.
Table 3: Overview of operating modes
Mode
Function
Normal
operation
GSM/GPRS
SLEEP
Module will automatically go into sleep mode if the conditions of sleep
mode are enabling and there is no on air or 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.
GSM
IDLE
Software is active. Module registered to the GSM network, and the
module is ready to communicate.
GSM
TALK
Connection between two subscribers is in progress. In this case, the power
consumption depends on network settings such as DTX off/on,
FR/EFR/HR, hopping sequences, antenna.
GPRS
STANDBY
Module is ready for GPRS data transfer, but no data is currently sent or
received. In this case, power consumption depends on network settings
and GPRS configuration.
GPRS
DATA
There is GPRS data transfer (PPP or TCP or UDP) in progress. In this
case, power consumption is related with network settings (e.g. power
control level); uplink/downlink data rates and GPRS configuration (e.g.
used multi-slot settings).
Power off
Normal Power off by sending the AT command “AT+CPOWD=1” or using the PWRKEY.
The power management unit shuts down the power supply for the baseband part of the
module, and only the power supply for the RTC is remained. Software is not active. The
serial port is not accessible. Power supply (connected to VBAT) remains applied.
Minimum
functionality
mode
AT command “AT+CFUN” can be used to set the module to a minimum functionality
mode without removing the power supply. In this mode, the RF part of the module will not
work or the SIM card will not be accessible, or both RF part and SIM card will be closed,
and the serial port is still accessible. The power consumption in this mode is lower than
normal mode.

SIM Tech SIMCom SIM800 Specifications

General

Frequency Bands	Quad-band 850/900/1800/1900MHz
Compliant to GSM Phase	2/2+
Low Power Consumption (Sleep Mode)	1.0mA
Operating Temperature	-40°C to +85°C
Data Rate	GPRS: Max. 85.6 kbps (downlink), Max. 42.8 kbps (uplink)
GPRS Multi-slot Class	Class 10
GPRS Mobile Station	GPRS mobile station class B
Transmitting Power	Class 4 (2W) @ 850/900MHz, Class 1 (1W) @ 1800/1900MHz
GPRS Data Features	PBCCH support, Coding schemes CS 1, 2, 3, 4
SMS	Text and PDU mode, MO / MT
USSD	Support
Supply Voltage	3.4V - 4.4V
Dimensions	24mm x 24mm x 3mm
Certifications	CE, RoHS

Summary

Introduction

SIM800 Overview

SIM800 Key Features

Lists the main features and specifications of the SIM800 module.

Operating Modes

Details the different operating states of the SIM800 module.

SIM800 Functional Diagram

Illustrates the internal functional blocks of the SIM800 module.

Package Information

Pin Out Diagram

Shows the pin configuration and numbering of the SIM800 module.

Pin Description

Provides detailed descriptions and comments for each pin of the SIM800 module.

Package Dimensions

Specifies the physical dimensions and mechanical outlines of the SIM800 module.

Application Interface

Power Supply

Details the power supply requirements and reference circuits for the SIM800.

Power on/off SIM800

Explains the procedures for powering the SIM800 module on and off.

Power Saving Mode

Describes the power saving modes available for the SIM800 module.

RTC Backup

Outlines the circuits and methods for Real-Time Clock backup.

Serial Port and USB Interface

Covers the serial port and USB connectivity for communication and debugging.

Audio Interfaces

Explains the audio input and output interfaces for the SIM800 module.

SIM Card Interface

Details the SIM card interface, including pin definitions and design considerations.

PCM Interface

Explains the Pulse Code Modulation interface for audio data.

Keypad Interface

Covers the keypad matrix connections supported by the SIM800.

I2C BUS

Describes the Inter-Integrated Circuit bus interface.

General Purpose Input/Output (GPIO)

Explains the usage of General Purpose Input/Output pins.

ADC

Details the Analog-to-Digital Converter functionality.

PWM

Covers the Pulse Width Modulation output capabilities.

Network Status Indication

Explains the NETLIGHT pin for network status indication.

Operating Status Indication

Describes the STATUS pin for module operating status.

KPLED

Details the KPLED pin for keypad backlight control.

RF Synchronization Signal

Explains the RF synchronization signal for transmit bursts.

Antenna Interface

Covers the GSM and Bluetooth antenna interfaces.

PCB Layout

PIN Assignment

Guidelines for understanding pin assignments for PCB design.

Principle of PCB Layout

Key principles for effective PCB layout design for the module.

Antenna

Recommendations for placing and routing antenna components.

Power Supply

Guidelines for PCB layout of power supply lines and ground.

SIM Card Interface

Layout considerations for the SIM card interface.

Audio Interface

Layout advice to avoid noise in audio traces.

Others

General layout recommendations for UART and USB signals.

Recommended PCB Layout

Illustrates a recommended PCB layout for the module.

Electrical, Reliability and Radio Characteristics

Absolute Maximum Ratings

Specifies the absolute limits for module operation.

Recommended Operating Conditions

Lists the recommended operational parameters for the module.

Digital Interface Characteristics

Details the electrical characteristics of digital interface pins.

SIM Card Interface Characteristics

Electrical characteristics specific to the SIM card interface.

SIM_VDD Characteristics

Electrical characteristics for the SIM VDD power supply.

VDD_EXT Characteristics

Electrical characteristics for the VDD_EXT output.

VRTC Characteristics

Electrical characteristics for the VRTC (RTC backup) pin.

Current Consumption (VBAT=4V)

Table showing current consumption under various operating conditions.

Electro-Static Discharge

ESD sensitivity and test results for the module.

Radio Characteristics

Specifies conducted output power for GSM bands.

Module RF Receive Sensitivity

Details the RF receive sensitivity of the module.

Module Operating Frequencies

Lists the operating frequency bands for the module.

Manufacturing

Top and Bottom View of SIM800

Visual representation of the top and bottom of the SIM800 module.

Typical Solder Reflow Profile

Recommended temperature profile for solder reflow processes.

The Moisture Sensitivity Level

Information on moisture sensitivity and floor life of the module.

Baking Requirements

Guidelines for baking the module to prevent moisture damage.

Appendix

Related Documents

Lists relevant documents for further reference.

Terms and Abbreviations

Safety Caution