Sim800L is a GSM/GPRS module. You can send a message, make a call, transfer data though the GPRS or something else.


Overview
This SIM800l module has a set of TTL level serial interface, a set of power supply interface. Besides, there are a set of antenna interface on this module.
The chip of SIM800L basic features
SIM800H is a complete Quad-band GSM/GPRS solution in a LGA type which can be embedded in the customer
Applications:
SIM800H support Quad-band 850/900/1800/1900MHz, it can transmit Voice, SMS and data information with low power
Consumption:
With tiny size of 15.8*17.8*2.4 mm, it can fit into slim and compact demands of customer design. Featuring
Bluetooth, FM and Embedded AT, it allows total cost savings and fast time-to-market for customer applications.
General features
•Quad-band 850/900/1800/1900MHz
•GPRS multi-slot class 12/10
•GPRS mobile station class B
•Compliant to GSM phase 2/2+
– Class 4 (2 W @ 850/900MHz)
– Class 1 (1 W @ 1800/1900MHz)
•Bluetooth: Compliant with 3.0+EDR
•FM: 76~109MHz worldwide bands with 50 KHz tuning step
•Dimensions: 15.8*17.8*2.4mm
•Weight: 1.35g
•Control via AT commands (3GPP TS 27.007, 27.005 And SIMCOM enhanced AT Commands)
•Supply voltage range 3.4 ~ 4.4V
•Low power consumption
•Operation temperature:-40℃ ~85℃
Specifications for GPRS Data
•GPRS class 12: Max. 85.6 kbps (downlink/uplink)
•PBCCH support
•Coding schemes CS 1, 2, 3, 4
•PPP-stack
•CSD up to 14.4 kbps
•USSD
•Non transparent mode
Specifications for SMS via GSM/GPRS
•Point to point MO and MT
•SMS cell broadcast
•Text and PDU mode
Software features
•0710 MUX protocol
•Embedded TCP/UDP protocol
•FTP/HTTP
•MMS
•E-MAIL
•DTMF
•Jamming Detection
•Audio Record
•TTS
•Embedded AT (optional)
Specifications for voice
•Triode
– Half rate (HR)
– Full rate (FR)
– Enhanced Full rate (EFR)
•AMR
– Half rate (HR)
– Full rate (FR)
•Hands-free operation
（Echo suppression）
Interfaces
88 LGA pads including:
•Analog audio interface
•RTC backup
•Serial interface
•Interface to external SIM 3V/1.8V
•GSM Antenna pad
•FM Antenna pad
•Bluetooth Antenna pad
Compatibility
•AT cellular command interface Certifications (Plan):
•CE
•GCF
•FCC
•ROHS
•REACH
The module Basic features
 Arduino 51 STM32 AVR MCU compatible
 Prototype expand
 The frequency is 850/900/ 1800/1900 MHz
 Power supply range: voltage is 4.6-5.2v; current is 1A or more (the current is very important).
 Operating temperature range: -40 degrees C to +85 C
 Communication interface: The TTL level serial interface compatible 2.85/3.3/5v MCU
 LED: Two led, the Net led and the RING led.
 Size:27*39mm
 SIMCARD: micro SIMCARD holder

The description of pins:
The name of pins Description
5v Power interface Power the module
CONNECT TO DC5v
GND
VDD TTL UART interface The TTL UART serial interface, you can connect the MCU like 51MCU or ARM or MSP430 directly. The pin of VDD is used to match voltage of the TTL.
SIM_TXD
SIM_RXD
GND if this pin is unused, keep open
RST RST the module, if this pin is unused, keep open
The name of pins Description
5v Power interface Power the module
CONNECT TO DC5v
GND
VDD TTL UART interface The TTL UART serial interface, you can connect the MCU like 51MCU or ARM or MSP430 directly. The pin of VDD is used to match voltage of the TTL.
SIM_TXD
SIM_RXD
GND if this pin is unused, keep open
RST RST the module, if this pin is unused, keep open