• Figure 1: SIM800HSIM800L functional diagram
  • 2015-07-27 Smart Machine Smart Decision 3. Package Information
  • Smart Machine Smart Decision SIM800HSIM800L_Hardware Design_V2.02 16 2015-07-27 3.2. Pin Description Table 5: Pin description
  • Smart Machine Smart Decision SIM800HSIM800L_Hardware Design_V2.02 17 2015-07-27
  • Smart Machine Smart Decision FM_ANTN 57 I Synchronizing signal of RF
  • 2015-07-27 Figure 4: Recommended PCB footprint outline (Unit: mm)
  • Figure 5: Reference circuit of the VBAT input Table 6: Recommended zener diode Vendor Part number Power(watts)
  • Figure 6: Reference circuit of the LDO power supply SIM800HSIM800L_Hardware Design_V2.02 20 2015-07-27
  • Figure 7: Reference circuit of the DC-DC power supply
  • Figure 8: VBAT voltage drop during transmit burst 4.1.1. Power Supply Pin
  • Smart Machine Smart Decision




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    Smart Machine Smart Decision 
    2.4. Functional Diagram 
    The following figure shows a functional diagram of SIM800H&SIM800L: 

    GSM baseband 

    GSM RF 

    Antenna interface 

    Other interface 
    Figure 1: SIM800H&SIM800L functional diagram 
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    SIM800H&SIM800L_Hardware Design_V2.02 14 2015-07-27 


    Smart Machine Smart Decision 
    3. Package Information 
    3.1. Pin Out Diagram 
    Figure 2: Pin assignment (Top view) 
    SIM800H&SIM800L_Hardware Design_V2.02 15 2015-07-27 


    Smart Machine Smart Decision 
    SIM800H&SIM800L_Hardware Design_V2.02 16 2015-07-27 
    3.2. Pin Description 
    Table 5: Pin description 
    Pin name 
    Pin number 
    I/O Description 
    Comment 
    Power supply 
    VBAT 
    1,42 

    Power supply 
    VRTC 
    56 
    I/O Power supply for RTC
    It is recommended to 
    connect with a battery or a 
    capacitor (e.g. 4.7uF). 
    VDD_EXT 
    18 

    2.8V power output
    If these pins are unused, 
    keep open. 
    GND 
    2,6,8,35,37,38,39,
    41,43,44,45,58,67
    ,71,72,73,76,77,7
    8,79,80,81,82,83,
    84,85,86,87,88 
    Ground 
    GND for VBAT recommend 
    to use 2,43,44,45pin 
    Power on/down 
    PWRKEY 
    48 

    PWRKEY should be pulled low at 
    least 1 second and then released to 
    power on/down the module.
    Internally pulled up to 
    VBAT. 
    Audio interfaces 
    MIC1P 
    52 
    MIC1N 
    12 

    Differential audio input 
    SPK1P 
    53 
    SPK1N 
    13 

    Differential audio output 
    MIC2P 

    MIC2N 
    10 

    Differential audio input 
    SPK2P 
    51 
    SPK2N 
    11 

    Differential audio output 
    If these pins are unused, 
    keep open. 
    PCM interface 
    PCM_CLK 
    29 

    PCM_OUT 
    30 

    PCM_SYNC 
    65 

    PCM_IN 
    66 

    PCM interface for digital audio 
    If these pins are unused, 
    keep open. 
    Keypads interface 
    KBC4 
    24 

    KBC3 
    21 

    KBC2 
    22 

    KBC1 
    25 

    KBC0 
    20 

    KBR4 
    63 

    KBR3 
    23 

    Support up to 50 buttons (5*5*2) 
    If these pins are unused, 
    keep open.(Please make 
    sure pin20 at high level 
    when power on) 


    Smart Machine Smart Decision 
    SIM800H&SIM800L_Hardware Design_V2.02 17 2015-07-27 
    KBR2 
    61 

    KBR1 
    60 

    KBR0 
    62 

    GPIO 
    GPIO1 

    I/O 
    GPIO2 
    27 
    I/O 
    GPIO3 
    28 
    I/O 
    Programmable general purpose input 
    and output 
    NETLIGHT 
    64 

    Network status 
    STATUS 


    Power on status 
    Serial port 
    DTR 
    69 

    Data terminal ready 
    RI 
    68 

    Ring indicator 
    DCD 
    70 

    Data carrier detect 
    CTS 
    34 

    Request to send 
    RTS 
    33 

    Clear to send 
    TXD 
    32 

    Transmit data 
    RXD 
    31 

    Receive data 
    If these pins are unused, 
    keep open. 
    Debug interface 
    VBUS 


    USB_DP 
    59 
    I/O 
    USB_DN 
    19 
    I/O 
    Debug and download 
    If these pins are unused, 
    keep open. 
    ADC 
    ADC 
    50 

    10bit general analog to digital 
    converter 
    If these pins are unused, 
    keep open. 
    PWM 
    PWM 
    26 

    Pulse-width modulation 
    If these pins are unused, 
    keep open. 
    I2C 
    SDA 
    75 
    I/O Open drain output 
    SCL 
    74 

    Open drain output 
    If these pins are unused, 
    keep open. 
    SIM card interface 
    SIM_VDD 
    16 

    Voltage supply for SIM card. 
    Support 1.8V or 3V SIM card 
    SIM_DATA 
    14 
    I/O SIM data input/output 
    SIM_CLK 
    55 

    SIM clock 
    SIM_RST 
    15 

    SIM reset 
    All signals of SIM interface 
    should be protected against 
    ESD with a TVS diode 
    array. 
    SIM_DET 
    54 

    SIM card detection 
    If these pins are unused, 
    keep open. 
    Antenna interface 
    GSM_ANT 
    40 
    I/O Connect GSM antenna 
    BT_ANT 
    36 
    I/O Connect Bluetooth antenna 
    Only SIM800H 
    FM_ANTP 
    17 

    Differential antenna for FM 


    Smart Machine Smart Decision 
    FM_ANTN 
    57 

    Synchronizing signal of RF 
    RF_SYNC 


    Synchronizing signal of RF 
    Other
    RESET 
    49 

    Reset input(Active low) 
     
    ISINK1 
    46 

    Drive keypad backlight 
     
    ISINK0 
    47 

    Drive LCD backlight 
     
    3.3. Package Dimensions 
     
    Figure 3: Dimensions of SIM800H&SIM800L (Unit: mm) 
     
    SIM800H&SIM800L_Hardware Design_V2.02 18 2015-07-27 


    Smart Machine Smart Decision 
    SIM800H&SIM800L_Hardware Design_V2.02 19 2015-07-27 
    Figure 4: Recommended PCB footprint outline (Unit: mm) 


    Smart Machine Smart Decision 
    4. Application Interface 
    4.1. Power Supply 
    The power supply range of SIM800H&SIM800L is from 3.4V to 4.4V.Recommended voltage is 4.0V.The 
    transmitting burst will cause voltage drop and the power supply must be able to provide sufficient current up to 
    2A. For the VBAT input, a bypass capacitor (low ESR) such as a 100 µF is strongly recommended. 
    Increase the 33pF and 10pF capacitors can effectively eliminate the high frequency interference. A 
    5.1V/500mW Zener diode is strongly recommended, the diode can prevent chip from damaging by the voltage 
    surge. These capacitors and Zener diode should be placed as close as possible to SIM800H&SIM800L VBAT 
    pins.
    Figure 5: Reference circuit of the VBAT input 
    Table 6: Recommended zener diode 
     
    Vendor 
    Part number 
    Power(watts) 
    Packages 

    On semi 
    MMSZ5231BT1G 
    500mW 
    SOD123 

    Prisemi 
    PZ3D4V2H 
    500mW 
    SOD323 

    Vishay 
    MMSZ4689-V 
    500mW 
    SOD123 

    Crownpo 
    CDZ55C5V1SM 
    500mW 
    0805 
    The following figure is the reference design of +5V input power supply. The designed output for the power 
    supply is 4.1V, thus a linear regulator can be used. 
    Figure 6: Reference circuit of the LDO power supply 
    SIM800H&SIM800L_Hardware Design_V2.02 20 2015-07-27 


    Smart Machine Smart Decision 
    If there is a high drop-out between the input and the desired output (VBAT), a DC-DC power supply will be 
    preferable because of its better efficiency especially with the 2A peak current in burst mode of the module. The 
    following figure is the reference circuit. 
    Figure 7: Reference circuit of the DC-DC power supply 
    The single 3.7V Li-ion cell battery can be connected to SIM800H&SIM800L VBAT pins directly. But the Ni-Cd 
    or Ni-MH battery must be used carefully, since their maximum voltage can rise over the absolute maximum 
    voltage of the module and damage it. 
    When battery is used, the total impedance between battery and VBAT pins should be less than 150mΩ. 
    The following figure shows the VBAT voltage drop at the maximum power transmit phase, and the test condition 
    is as following: 
    VBAT=4.0V,
    A VBAT bypass capacitor C
    A
    =100µF tantalum capacitor (ESR=0.7Ω), 
    Another VBAT bypass capacitor C
    B
    =1µF.
    Figure 8: VBAT voltage drop during transmit burst 
    4.1.1. Power Supply Pin 
    Pin 1 and Pin 42 are VBAT input, Pins 2,43,44,45 are GND of power supply, VRTC pin is power supply of the 
    RTC circuit in the module. VDD_EXT output 2.8V when module is in normal operation mode. 
    When designing the power supply in customer’s application, pay special attention to power losses. Ensure that 
    the input voltage never drops below 3.0V even when current consumption rises to 2A in the transmit burst. If the 
    power voltage drops below 3.0V, the module may be shut down automatically. The PCB traces from the VBAT 
    pins to the power supply must be wide enough (at least 60mil) to decrease voltage drops in the transmit burst. 
    The power IC and the bypass capacitor should be placed to the module as close as possible. 

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