Hardware Design V1.01(091226)
Table Of Contents
- Contents
- Version history
- 1 Introduction
- 2 SIM900 Overview
- 3 Application Interface
- 3.1 SIM900 Pin Description
- 3.2 Operating Modes
- 3.3 Power Supply
- 3.4 Power Up and Power Down Scenarios
- 3.5 Power Saving
- 3.6 Summary of State Transitions (except SLEEP mode)
- 3.7 RTC Backup
- 3.8 Serial Interfaces
- 3.9 Audio Interfaces
- 3.10 SIM Card Interface
- 3.11 LCD Display Interface
- 3.12 Keypad Interface
- 3.13 ADC
- 3.14 Behaviors of the RI
- 3.15 Network Status Indication
- 3.16 General Purpose Input Output (GPIO)
- 3.17 External Reset
- 3.18 PWM
- 3.19 I2C Bus
- 4 Antenna Interface
- 5 Electrical, Reliability and Radio Characteristics
- 6 Mechanics
SIM900 Hardware Design
controlled in 50Ω. To help you to ground the antenna, SIM900 comes with a grounding plane located close to the
antenna pad. The Pin 60 is the RF antenna pad.
SIM900 material properties:
SIM900 PCB Material: FR4
Antenna pad: Gold plated pad
4.2 Module RF Output Power
Table 23: SIM900 conducted RF output power
Frequency Max Min
GSM850 33dBm ±2db 5dBm±5db
EGSM900 33dBm ±2db 5dBm±5db
DCS1800 30dBm ±2db 0dBm±5db
PCS1900 30dBm ±2db 0dBm±5db
4.3 Module RF Receive Sensitivity
Table 24: SIM900 conducted RF receive sensitivity
Frequency Receive sensitivity
GSM850 < -106dBm
EGSM900 < -106dBm
DCS1800 < -106dBm
PCS1900 < -106dBm
4.4 Module Operating Frequencies
Table 25: SIM900 operating frequencies
Frequency Receive Transmit
GSM850 869 ～ 894MHz 824 ～ 849 MHz
EGSM900 925 ～ 960MHz 880 ～ 915MHz
DCS1800 1805 ～ 1880MHz 1710 ～ 1785MHz
PCS1900 1930 ～ 1990MHz 1850 ～ 1910MHz
SIM900_HD_V1.01 26.12.2009
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