Sim800L gsm module

SIM800L GSM/GPRS Module 

The SIM800L is a compact quad-band GSM/GPRS communication module developed by 
SIMCom Wireless Solutions. It is designed for embedded systems requiring SMS, voice, and 
GPRS data connectivity over cellular networks. 
The module communicates via UART using AT commands and operates at a low supply voltage. 
Proper power regulation and logic level compatibility are essential to ensure stable operation and 
prevent hardware damage. 

 Features 
 Quad-band GSM: 850 / 900 / 1800 / 1900 MHz 
 GPRS Multi-slot Class 12 (Max. 85.6 kbps download/upload) 
 GPRS Mobile Station Class B 
 Controlled via AT Commands (3GPP TS 27.007, 27.005 + SIMCom enhanced commands) 
 Integrated Real-Time Clock (RTC) 
 Supply Voltage: 3.7V – 4.2V (Typical 4.0V) 
 Peak Current: Up to 2A during transmission 
 UART Logic Level: ~2.8V–3.0V (Not 5V tolerant) 
 Supports Assisted GPS (A-GPS via network data assistance) 
 Low Power Sleep Mode: ~1mA (configuration dependent) 
 Compact Size: 23mm × 35mm × 5.6mm 
 Micro SIM Card Interface 

 Important Notes 
 Requires stable 4.0V supply capable of ≥2A peak current 
 RX pin must not be driven directly with 5V logic 
 GSM antenna must be connected before operation