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SIM900E Document
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
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GPRS multi-slot class 10/8
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GPRS mobile station class B
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Compliant to GSM phase 2/2+
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Class 4 (2W) at GSM 850 and EGSM 900
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Class 1 (1W) at DCS 1800 and PCS 1900
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Dimensions: 19.8*19.8*2.7mm
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Weight: 2.4 g
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Control via AT commands (GSM 07.07 ,07.05 and SIMCom enhanced AT Commands)
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Supply voltage range 3.2V ~ 4.8V
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Low power consumption
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Operation temperature: -30°C ~ +80°C
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69 SMT pads include
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Interface to external SIM 3V/1.8V
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Analog audio interface
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RTC backup
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Serial interface
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LCD interface
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Antenna pad
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GPIO
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ADC
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User Manual
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Summary of Contents for SimCom SIM900E
- Page 1 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.
- Page 2 SIM900E Document 1.3. Pin Name and IO Characters Pin No. Pin Name Pin No. Pin Name VDD_EXT SPK_P PWRKEY SPK_N GPIO12 MIC_N MIC_P DBG_RXD NETLIGHT DBG_TXD VRTC SIM_CLK SIM_PRESENCE SIM_DATA GPIO8/KBC2 SIM_RST GPIO1/KBR4 SIM_VDD GPIO9/KBC1 STATUS GPIO6/KBC4 NRESET GPIO7/KBC3 GPIO5/KBR0...
- Page 3 SIM900E Document 1.4. Pictures Figure 1: Top view of SIM900E Figure 2: Bottom view of SIM900E - 3 -...
- Page 4 SIM900E Document 1.5. Dimension Figure 3: Dimention - 4 -...
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Page 5: Detail Block Diagram
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... - Page 6 SIM900E Document 3.2. Digital Interface Characteristics Table 2: Digital interface characteristics Symbol Parameter Unit High-level input current Low-level input current High-level input voltage Low-level input voltage High-level output voltage Low-level output voltage * These parameters are for digital interface pins, such as keypad, GPIO, I C, UART, LCDand DEBUG.
- Page 7 SIM900E Document 3.5. VRTC Characteristics Table 5: VRTC characteristics Symbol Parameter Unit VRTC input voltage 2.00 3.00 3.15 RTC-IN VRTC input current RTC-IN VRTC output voltage 3.00 RTC-OUT VRTC output current RTC-OUT 3.6. Current Consumption (VBAT = 3.8V) Table 6: Current consumption...
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Page 8: Electrostatic Discharge
VBAT-peak 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. Table 7 : The ESD characteristics (Temperature: 25℃, Humidity: 45 %) -
Page 9: Radio Characteristics
±3 ±4 ±5 ±6 ±5 ±6 ±5 ±6 19-31 ±5 ±6 Table 10 : SIM900E DCS1800 and PCS1900 conducted RF output power DCS1800 and PCS1900 Tolerance (dB) for conditions Nominal output power (dBm) Normal Extreme ±3 ±4 ±3 ±4 ±3 ±4... - Page 10 30dBm, and at the maximum power level, the output power tolerance should not exceed +/-2dB under normal condition and +/-2.5dB under extreme condition. 4.2. Module RF Receive Sensitivity The following table shows the module’s conducted receive sensitivity, it is tested under static condition. Table 11 : SIM900E conducted RF receive sensitivity Frequency Receive sensitivity（Typical） Receive sensitivity(Max)
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Page 11: Rf Circuit Routing Constraints
(εr) of the material used, trace width (W), trace thickness (T), and height (H) between the trace and the reference ground plane. In order to respect this constraint, SIMCom recommends that a MicroStrip structure be used and trace width be computed with a simulation tool (such as CITS25, shown in the... -
Page 12: Regulatory Information
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. - Page 13 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.
- Page 14 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.
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