User's Manual

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SIM808 Document

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1. SIM808 Description

1.1. Summarize

SIM808 designed by SIMCom is a quad band module which supports GSM/GPRS. The baseband circuit is

based on MTK and RF circuit is based on RFMD. It works at quad bands------GSM850, EGSM900, DCS1800,

and PCS1900. CPU clock is based on 26MHz crystal. The main IC includes MT6261D and RF7198. SIM808 is

in compliance with the essential requirements and other relevant provisions of Directive1999/5/EC .

1.2. Feature

● Quad-Band 850/900/1800/1900MHz

● GPRS multi-slot class 12

● GPRS mobile station class B

● Compliant to GSM phase 2/2+

– Class 4 (2 W @ 850/900 MHz)

– Class 1 (1 W @ 1800/1900MHz)

● 22 tracking/66 acquisition-channel GPS L1 receiver

● Dimensions: 24*24*2.6 mm

● Weight: 3.3 g

● Control via AT commands (3GPP TS 27.007, 27.005 and SIMCom enhanced AT Commands)

● Supply voltage range 3.4~4.4 V

● Low power consumption

● Operation temperature:-40~85℃

● 68 SMT pads include

– Interface to external SIM 3V/1.8V

– Analog audio interface

– RTC backup

– Serial interface

– I2C interface

– USB interface

– Keypad interface

– Antenna pad

– PCM interface

– PWM

– GPIO

– ADC

– Other signal

Summary of content (14 pages)

PAGE 1
SIM808 Document 1. SIM808 Description 1.1. Summarize SIM808 designed by SIMCom is a quad band module which supports GSM/GPRS. The baseband circuit is based on MTK and RF circuit is based on RFMD. It works at quad bands------GSM850, EGSM900, DCS1800, and PCS1900. CPU clock is based on 26MHz crystal. The main IC includes MT6261D and RF7198. SIM808 is in compliance with the essential requirements and other relevant provisions of Directive1999/5/EC . 1.2.
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Smart Machine Smart Decision 1.3.
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Smart Machine Smart Decision 1.4. Picture Figure 1: Top and Bottom view of SIM808 1.5.
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Smart Machine Smart Decision 2. Detail Block Diagram Figure 3: Block diagram of SIM808 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 SIM808. Table 1: Absolute maximum ratings Symbol Min Typ Max Unit VBAT - - 4.5 V Current 0 2.
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Smart Machine Smart Decision IIH High-level input current 2.1 - 3.1 V IIL Low-level input current -0.3 - 0.7 V VOH High-level input voltage 2.4 2.8 - V VOL Low-level input voltage - - 0.4 V * These parameters are for digital interface pins, such as keypad, GPIO, I2C, UART, PWMs and PCM. 3.3.
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Smart Machine Smart Decision 3.6. Current Consumption Table 6: Module current consumption (VBAT = 4V, GPS engine is powered down) Symbol Parameter VBAT Voltage IVBAT Conditions Typ Max Unit 3.4 4.0 4.4 V Voltage drop PCL=5 350 mV Voltage ripple PCL=5 @ f<200kHz @ f>200kHz 50 2.0 mV mV 150 uA Average current Power off mode 134 Sleep mode (AT+CFUN=1): ( BS-PA-MFRMS=9 ) ( BS-PA-MFRMS=5) ( BS-PA-MFRMS=2) 1.073 1.167 1.627 mA mA mA Idle mode (AT+CFUN=1): EGSM900 16.80 mA 216.
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Smart Machine Smart Decision Module By instrument Real networking Conditions CNo(dB/Hz) Current(mA) Leak current when power off Not accessible / No Fix / 23.5 -130dBm/Tracking 38-39 21.8 -140dBm/Tracking 28-29 21.7 -150dBm/Tracking 18-19 20.6 -160dBm/Tracking 13-14 19.8 -130dBm/Cold start 41-42 24.7 -140dBm/Cold start 31-32 24.9 -150dBm/Cold start / 23.2 Leak current when power off Not accessible / No Fix / 21 Searching / 19.4 Fixed 35 19.
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Smart Machine Smart Decision RXD, TXD ±2KV ±8KV Antenna port ±5KV ±10KV SPK_P/SPK_N/ MIC_P/MIC_N ±4KV ±8KV PWRKEY ±4KV ±8KV Note: It is suggested that customers in serials with 100ohm resistances on UART lines for ESD consideration. 4. Radio Characteristics 4.1. Module GSM/GPRS 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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Smart Machine Smart Decision Normal Extreme 0 30 ±2 ±2.
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Smart Machine Smart Decision 4.3. Module GPS Receiver Performance The following table shows the module’s conducted TTFF(Time To First Fix) and receive sensitivity, it is tested under static condition. Table 12: SIM808 conducted GPS Performance Parameter Description Performance (Type) Sensitivity Autonomous acquisition(cold start) -148dBm Re-acquisition -159dBm Tracking -165dBm Hot start <1s Warm start 28s Clod start 30s Time To First Fix 4.4.
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Smart Machine Smart Decision from DC voltage. This is necessary because the antenna connector is DC coupled to ground via an inductor for ESD protection. The external antenna must be matched properly to achieve best performance, so the matching circuit is necessary, the connection is recommended as following: Figure1: GSM antenna matching circuit R101，C101，C102 are the matching circuit, the value should be defined by the antenna design. normally R101 is 0Ω, C101 和 C102 are not SMD.
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Smart Machine Smart Decision Figure 1: GPS active antenna matching circuit There are some suggestions to components placing and lying for GSM and Bluetooth RF traces:  The RF connector is used for conducted test, so keep it as close as pin RF_ANT;  Antenna matching circuit should be closed to the antenna;  Keep the RF traces as 50Ω；  The RF traces should be kept far away from the high frequency signals and strong disturbing source. 5.3.
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Smart Machine Smart Decision 1. 2. 3. 4. 5. 6. Frequency Range: 1575.42±3MHz Impedance: 50 Ohms nominal VSWR: ≦1.5 Gain: 3.0dBi Polarization: RHCP Connector Type: SMA P/S Figure 7 GPS antenna Federal Communication Commission Interference Statement This device complies with Part 15 of the FCC Rules.
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Smart Machine Smart Decision This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.The antenna(s) used for this transmitter must be installed to provide a separation distance of at least20 cm from all persons and must not be co-located or operating in conjunction with any other antenna orTransmitter.