SIM900/SIM900A GSM/GPRS Minimum System Module

Overview

GPRS module is a breakout board and minimum system of SIM900 Quad-band/SIM900A Dual-band GSM/GPRS module. It can communicate with controllers via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands). This module supports software power on and reset.

Features

• Quad-Band 850/ 900/ 1800/ 1900 MHz
• Dual-Band 900/ 1900 MHz
• GPRS multi-slot class 10/8GPRS mobile station class B
• Compliant to GSM phase 2/2+Class 4 (2 W @850/ 900 MHz)
• Class 1 (1 W @ 1800/1900MHz)
• Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
• Low power consumption: 1.5mA(sleep mode)
• Operation temperature: -40°C to +85 °C

Specifications

PCB size	71.4mm X 66.0mm X1.6mm
Indicators	PWR, status LED, net LED
Power supply	5V
Communication Protocol	UART
RoHS	Yes

Electrical Characteristics

Parameter	Min.	Typical	Max.	Unit
Power voltage (Vsupply)	4.5		5.5	VDC
Input voltage VH	0.7VCC		5.5	V
Input voltage VL	-0.3	0	0.3VCC	V
Current Consumption (pulse)	-		2000	mA
Current Consumption (continuous)			500	mA
Baud rate		115200		bps

Hardware

Interface	Pin	Description
Rst	1	Reset the SIM900 module
P	2	Power switch pin of SIM900 module
Tx	3	UART data output
Rx	4	UART data in
DT	5	Debug UART data output
DR	6	Debug UART data input
-	7	GND
+	8	VCC

Installation

Power on GPRS module

User can power on the GPRS module by pulling down the PWR button or the P pin of control interface for at least 1 second and release. This pin is already pulled up to 3V in the module internal, so external pull up is not necessary. When power on procedure is completed, GPRS module will send following URC to indicate that the module is ready to operate at fixed baud rate.

Note

In some countries where dual band exists, we recommend to use SIM900A to reduce costs. For the country list, please click here.