User's Manual

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SIM900E Document

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User Manual

1. SIM900E Description

1.1. Summarize

SIM900E designed by SIMCom is a quad-band module which supports GSM/GPRS. The baseband circuit is

based on STE and RF circuit is based on RFMD. It works at quad bands------GSM 850MHz, EGSM 900MHz,

DCS 1800MHz and PCS 1900MHz. CPU clock is based on 26MHz crystal. The main IC includes PNX4851,

RF7176 and Flash, etc.

1.2. Feature

● Quad-band 900/1800/850/1900MHz

● GPRS multi-slot class 10/8

● GPRS mobile station class B

● Compliant to GSM phase 2/2+

– Class 4 (2W) at GSM 850 and EGSM 900

– Class 1 (1W) at DCS 1800 and PCS 1900

● Dimensions: 19.8*19.8*2.7mm

● Weight: 2.4 g

● Control via AT commands (GSM 07.07 ,07.05 and SIMCom enhanced AT Commands)

● Supply voltage range 3.2V ~ 4.8V

● Low power consumption

● Operation temperature: -30°C ~ +80°C

● 69 SMT pads include

– Interface to external SIM 3V/1.8V

– Analog audio interface

– RTC backup

– Serial interface

– LCD interface

– Antenna pad

– GPIO

– ADC

Summary of content (14 pages)

PAGE 1
SIM900E Document User Manual 1. SIM900E Description 1.1. Summarize SIM900E designed by SIMCom is a quad-band module which supports GSM/GPRS. The baseband circuit is based on STE and RF circuit is based on RFMD. It works at quad bands------GSM 850MHz, EGSM 900MHz, DCS 1800MHz and PCS 1900MHz. CPU clock is based on 26MHz crystal. The main IC includes PNX4851, RF7176 and Flash, etc. 1.2.
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SIM900E Document 1.3. Pin Name and IO Characters Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 69 Pin Name GND SPK_P SPK_N GND MIC_N MIC_P GND NETLIGHT GND SIM_CLK SIM_DATA SIM_RST SIM_VDD STATUS NRESET RXD TXD GND RTS CTS DTR RI DCD GPIO11 GND GND GND RF_ANT GND VBAT VBAT VBAT GND GND GND I/O Pin No.
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SIM900E Document 1.4.
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SIM900E Document 1.5.
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SIM900E Document 2. Detail Block Diagram Figure 4: Block diagram of SIM900E 3. Electrical and Reliability Characteristics 3.1. Absolute Maximum Ratings The absolute maximum ratings stated in following table are stress ratings under non-operating conditions. Stresses beyond any of these limits will cause permanent damage to SIM900E . Table 1: Absolute maximum ratings * Symbol Parameter Min Typ Max Unit VBAT Power supply voltage - - 5.5 V VI* Input voltage -0.3 - 3.
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SIM900E Document 3.2. Digital Interface Characteristics Table 2: Digital interface characteristics Symbol Parameter Min Typ Max Unit IIH High-level input current -10 - 10 uA IIL Low-level input current -10 - 10 uA VIH High-level input voltage 2.4 - - V VIL Low-level input voltage - - 0.4 V VOH High-level output voltage 2.7 - - V VOL Low-level output voltage - - 0.
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SIM900E Document 3.5. VRTC Characteristics Table 5: VRTC characteristics Symbol Parameter Min Typ Max Unit VRTC-IN VRTC input voltage 2.00 3.00 3.15 V IRTC-IN VRTC input current - 2 - uA VRTC-OUT VRTC output voltage - 3.00 - V IRTC-OUT VRTC output current - 10 - uA 3.6. Current Consumption (VBAT = 3.8V) Table 6: Current consumption Symbol Parameter Conditions Value Unit IVRTC VRTC current VBAT disconnects.
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SIM900E Document DCS 1800 PCS 1900 GSM 850 EGSM 900 Data mode GPRS(3Rx,2Tx) IVBAT-peak Peak current DCS 1800 PCS 1900 PCL=0 166 PCL=7 130 PCL=15 115 PCL=5 410 PCL=12 185 PCL=19 130 PCL=0 300 PCL=7 155 PCL=15 122 During Tx burst mA mA mA 2 A 3.7. Electro-Static Discharge SIM900E is an ESD sensitive component, so more attention should be paid to the procedure of handling and packaging. The ESD test results are shown in the following table.
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SIM900E Document 4. Radio Characteristics 4.1. Module RF Output Power The following table shows the module conducted output power, it is followed by the 3GPP TS 05.05 technical specification requirement.
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SIM900E Document 7 16 ±3 ±4 8 14 ±3 ±4 9 12 ±4 ±5 10 10 ±4 ±5 11 8 ±4 ±5 12 6 ±4 ±5 13 4 ±4 ±5 14 2 ±5 ±6 15-28 0 ±5 ±6 For the module’s output power, the followings should be noted: At GSM850 and EGSM900 band, the module is a class 4 device, so the module’s output power should not exceed 33dBm, and at the maximum power level, the output power tolerance should not exceed +/-2dB under normal condition and +/-2.5dB under extreme condition.
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SIM900E Document DCS1800 1805 ~ 1880MHz 1710 ~ 1785MHz PCS1900 1930 ~ 1990MHz 1850 ~ 1910MHz 5. RF Circuit Routing Constraints 5.1. General recommendations To route the RF antenna signals, the following recommendations must be observed for PCB layout: The RF signals must be routed using traces with a 50 characteristic impedance.
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SIM900E Document Figure 6: RF routing examples Fill the area around the RF traces with ground and ground vias to connect inner ground layers for isolation. Cut out ground under RF signal pads to reduce stray capacitance losses. Avoid routing RF traces with sharp corners. A smooth radius is recommended. The ground reference plane should be a solid continuous plane under the trace.
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SIM900E Document Although significant delays or losses of data are rare when wireless devices such as the SIMCom modem are used in a normal manner with a well-constructed network, the SIMCom modem should not be used in situations where failure to transmit or receive data could result in damage of any kind to the user or any other party, including but not limited to personal injury, death, or loss of property.
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SIM900E Document radiation, the maximum antenna gain including cable loss in a mobile-only exposure condition must not exceed 4.5dBi for GSM850 band and 2.5dBi for GSM PCS band. 3. SIM900E modem and the antenna must not be co-located or operating in conjunction with any other transmitter or antenna within a host device. 4. A label must be affixed to the outside of the end product into which the SIM900E modem is incorporated, with a statement similar to the following: a.