SimCom SIM800H Guida

SIM800H_Hardware_Design_V1.01

SmartMachineSmartDecision

SIM800H_Hardware_Design_V1.01 2 2013-08-20

Document Title SIM800H Hardware Design

Version 1.01

Date 2013-08-20

Status Release

Document Control ID SIM800H_Hardware_Design_V1.01

General Notes

SIMCom offers this information as a service to its customers, to support application and engineering efforts that

use the products designed by SIMCom. The information provided is based upon requirements specifically

provided to SIMCom by the customers. SIMCom has not undertaken any independent search for additional

relevant information, including any information that may be in the customer’s possession. Furthermore, system

validation of this product designed by SIMCom within a larger electronic system remains the responsibility of the

customer or the customer’s system integrator. All specifications supplied herein are subject to change.

This document contains proprietary technical information which is the property of SIMCom Limited, copying of

this document and giving it to others and the using or communication of the contents thereof, are forbidden

of a patent or the registration of a utility model or design. All specification supplied herein are subject to change

without notice at any time.

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SIM800H_Hardware_Design_V1.01 3 2013-08-20

Contents

Version History..........................................................................................................10

1. Introduction........................................................................................................ 11

2. SIM800H Overview........................................................................................... 11

2.1. SIM800H Key Features ...................................................................................................... 11

2.2. Operating Mode ..................................................................................................................13

2.3. Functional Diagram.............................................................................................................14

3. Package Information.........................................................................................15

3.1. Pin out Diagram ..................................................................................................................15

3.2. Pin Description....................................................................................................................16

3.3. Package Dimensions ...........................................................................................................19

4. Application Interface.........................................................................................21

4.1. Power Supply ......................................................................................................................21

4.1.1. Power supply pin................................................................................................................................. 22

4.1.2. Monitoring Power Supply ................................................................................................................... 23

4.2. Power on/down Scenarios...................................................................................................23

4.2.1. Power on SIM800H............................................................................................................................. 23

4.2.2. Power down SIM800H........................................................................................................................ 24

4.2.3. Reset Function..................................................................................................................................... 26

4.3. Power Saving Mode............................................................................................................27

4.3.1. Minimum Functionality Mode ............................................................................................................ 27

4.3.2. Sleep Mode (AT+CSCLK=1) ............................................................................................................. 28

4.3.3. Wake Up SIM800H from Sleep Mode (AT+CSCLK=1) ................................................................... 28

4.4. RTC Backup........................................................................................................................28

4.5. Serial Port and USB Interface............................................................................................. 29

4.5.1 Function of Serial Port ........................................................................................................................ 30

4.5.2 Serial Interfaces................................................................................................................................... 30

4.5.3 Debug Interface................................................................................................................................... 33

4.5.4 Software Upgrade and Debug ............................................................................................................. 33

4.5.5 Multiplexing function of serial port .................................................................................................... 34

4.6. RI Behaviors .......................................................................................................................35

4.7. Audio Interfaces..................................................................................................................36

4.7.1. Speaker Interfaces Configuration........................................................................................................ 37

4.7.2. Microphone Interfaces Configuration ................................................................................................. 37

4.7.3. Audio Electronic Characteristic .......................................................................................................... 38

4.7.4. TDD .................................................................................................................................................... 38

4.8. SIM Card Interface..............................................................................................................38

4.8.1. SIM Card Application ......................................................................................................................... 39

4.8.2. SIM Card Design Guide...................................................................................................................... 40

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4.8.3. Design Considerations for SIM Card Holder...................................................................................... 40

4.9. PCM Interface.....................................................................................................................42

4.9.1. PCM Multiplexing Function ............................................................................................................... 43

4.9.2. PCM Interface ..................................................................................................................................... 43

4.9.3. LCD Display/SPI Interface ................................................................................................................. 44

4.9.4. SD Card Interface................................................................................................................................ 44

4.10. Keypad Interface.................................................................................................................45

4.10.1. Keypad Multiplexing Function........................................................................................................ 47

4.11. I2C Bus ...............................................................................................................................47

4.11.1. I2C Multiplexing Function .............................................................................................................. 48

4.12. General Purpose Input/Output (GPIO) ...............................................................................48

4.13. ADC ....................................................................................................................................48

4.14. PWM ...................................................................................................................................48

4.14.1. PWM Multiplexing Function........................................................................................................... 49

4.15. Network Status Indication...................................................................................................49

4.15.1. NETLIGHT Multiplexing Function................................................................................................. 50

4.16. Operating Status Indication.................................................................................................50

4.16.1. STATUS Multiplexing Function ...................................................................................................... 51

4.17. LED Interface......................................................................................................................51

4.18. RF Synchronization Signal .................................................................................................51

4.19. Antenna Interface................................................................................................................52

4.19.1. GSM Antenna Interface ................................................................................................................... 52

4.19.2. Bluetooth antenna interface ............................................................................................................. 53

4.19.3. FM Antenna Interface ...................................................................................................................... 54

5. PCB Layout........................................................................................................55

5.1 Pin Assignment ...................................................................................................................55

5.2 Principle of PCB layout ......................................................................................................56

5.2.1 Antenna Interface................................................................................................................................ 56

5.2.2. Power Supply ...................................................................................................................................... 56

5.2.3 SIM Card Interface.............................................................................................................................. 56

5.2.4 Audio Interface.................................................................................................................................... 56

5.2.5 Others .................................................................................................................................................. 56

5.3 Recommended PCB Layout................................................................................................57

6. Electrical, Reliability and Radio Characteristics...........................................58

6.1 Absolute Maximum Ratings ...............................................................................................58

6.2 Recommended Operating Conditions .................................................................................58

6.3 Digital Interface Characteristics..........................................................................................58

6.4 SIM Card Interface Characteristics.....................................................................................59

6.5 SIM_VDD Characteristics ..................................................................................................59

6.6 VDD_EXT Characteristics .................................................................................................59

6.7 VRTC Characteristics .........................................................................................................59

6.8 Current Consumption (VBAT=3.8V) .................................................................................60

6.9 Electro-Static Discharge .....................................................................................................61

6.10 Radio Characteristics ..........................................................................................................61

6.10.1. Module RF Output Power................................................................................................................ 61

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6.11 Module RF Receive Sensitivity ..........................................................................................62

6.12 Module Operating Frequencies...........................................................................................62

7. Manufacturing ...................................................................................................63

7.1. Top and Bottom View of SIM800H ...................................................................................63

7.2. Typical Solder Reflow Profile ............................................................................................63

7.3. The Moisture Sensitivity Level...........................................................................................63

7.4. Baking Requirements..........................................................................................................64

8. Appendix.............................................................................................................65

I. Related Documents .............................................................................................................65

II. Multiplexing Function.........................................................................................................66

III. Terms and Abbreviations ....................................................................................................67

IV. Safety Caution.....................................................................................................................69

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SIM800H_Hardware_Design_V1.01 6 2013-08-20

Table Index

Table 1: SIM800H key features......................................................................................................11

Table 2: Coding schemes and maximum net data rates over air interface......................................13

Table 3: Overview of operating modes...........................................................................................13

Table 4: Pin description ..................................................................................................................16

Table 5: Recommended Zener diode ..............................................................................................21

Table 6: Electronic characteristic of the RESET pin ......................................................................27

Table 7: The current consumption of Minimum Functionality Mode (BS-PA-MFRMS=9) .........27

Table 8: Serial port and USB pin definition ...................................................................................29

Table 9: Serial port characteristics..................................................................................................30

Table 10: VBUS operation voltage.................................................................................................33

Table 11: Multiplexing function of serial port................................................................................34

Table 12: RI behaviors....................................................................................................................35

Table 13: Audio interface definition...............................................................................................36

Table 14: Performance of audio amplifier ......................................................................................36

Table 15: Microphone input characteristics....................................................................................38

Table 16: Audio output characteristics ...........................................................................................38

Table 17: SIM pin definition...........................................................................................................39

Table 18: Pin description (Molex SIM card holder).......................................................................41

Table 19: Pin description (Amphenol SIM card holder) ................................................................42

Table 20: PCM Pin definition .........................................................................................................42

Table 21: PCM specification ..........................................................................................................43

Table 22: PCM multiplexing function ............................................................................................43

Table 23: Pin definition of the keypad interface.............................................................................47

Table 24: Keypad multiplexing function ........................................................................................47

Table 25: Pin definition of the I2C .................................................................................................47

Table 26: I2C multiplexing function...............................................................................................48

Table 27: Pin definition of the GPIO..............................................................................................48

Table 28: Pin definition of the ADC...............................................................................................48

Table 29: ADC specification ..........................................................................................................48

Table 30: Pin definition of the PWM..............................................................................................48

Table 31: Buzzer output characteristics..........................................................................................49

Table 32: PWM multiplexing function ...........................................................................................49

Table 33: Pin definition of the NETLIGHT ...................................................................................49

Table 34: Status of the NETLIGHT pin .........................................................................................50

Table 35: NETLIGHT multiplexing function.................................................................................50

Table 36: Pin definition of the STATUS ........................................................................................50

Table 37: STATUS multiplexing function .....................................................................................51

Table 38: Pin definition of the LED ...............................................................................................51

Table 39: LED specification ...........................................................................................................51

Table 40: Definition of the BPI_BUS1 pin.....................................................................................52

Table 41: Absolute maximum ratings.............................................................................................58

Table 42: Recommended operating conditions...............................................................................58

Table 43: Digital interface characteristics ......................................................................................58

Table 44: SIM card interface characteristics...................................................................................59

Table 45: SIM_VDD characteristics...............................................................................................59

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SIM800H_Hardware_Design_V1.01 7 2013-08-20

Table 46: VDD_EXT characteristics ..............................................................................................59

Table 47: VRTC characteristics......................................................................................................59

Table 48: Current consumption ......................................................................................................60

Table 49: The ESD characteristics (Temperature: 25℃, Humidity: 45 %)....................................61

Table 50: GSM850 and EGSM900 conducted RF output power ...................................................61

Table 51: DCS1800 and PCS1900 conducted RF output power ....................................................62

Table 52: Conducted RF receive sensitivity ...................................................................................62

Table 53: Operating frequencies.....................................................................................................62

Table 54: Moisture sensitivity level and floor life.......................................................................... 64

Table 55: Baking requirements.......................................................................................................64

Table 56: Related documents..........................................................................................................65

Table 57: Multiplexing function .....................................................................................................66

Table 58: Terms and abbreviations.................................................................................................67

Table 59: Safety caution .................................................................................................................69

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SIM800H_Hardware_Design_V1.01 8 2013-08-20

Figure Index

Figure 1: SIM800H functional diagram..........................................................................................14

Figure 2: SIM800H pin out diagram (Top view)............................................................................15

Figure 3: Dimensions of SIM800H (Unit: mm) .............................................................................19

Figure 4: Recommended PCB footprint outline (Unit: mm) ..........................................................20

Figure 5: Reference circuit of the VBAT input ..............................................................................21

Figure 6: Reference circuit of the LDO power supply....................................................................21

Figure 7: Reference circuit of the DC-DC power supply ...............................................................22

Figure 8: VBAT voltage drop during transmit burst ......................................................................22

Figure 9: The minimal VBAT voltage requirement at VBAT drop ............................................... 23

Figure 10: Powered on/down module using transistor ...................................................................23

Figure 11: Powered on/down module using button ........................................................................23

Figure 12: Timing of power on module..........................................................................................24

Figure 13: Timing of power down SIM800H by PWRKEY ..........................................................25

Figure 14: Reset circuit...................................................................................................................26

Figure 15: Reset timing sequence ...................................................................................................27

Figure 16: RTC supply from capacitor ...........................................................................................28

Figure 17: RTC supply from non-chargeable battery .....................................................................29

Figure 18: RTC supply from rechargeable battery .........................................................................29

Figure 19: Connection of the serial interfaces ................................................................................31

Figure 20: Resistor matching circuit...............................................................................................31

Figure 21 : Diode isolation circuit ..................................................................................................32

Figure 22: TX level matching circuit..............................................................................................32

Figure 23: RX level matching circuit..............................................................................................32

Figure 24: USB reference circuit ....................................................................................................33

Figure 25: Connection for software upgrading and debugging ......................................................34

Figure 26: RI behaviour of voice calling as a receiver ...................................................................35

Figure 27: RI behaviour of data calling as a receiver .....................................................................35

Figure 28: RI behaviour of URC or receive SMS...........................................................................36

Figure 29: RI behaviour as a caller .................................................................................................36

Figure 30: Speaker reference circuit ...............................................................................................37

Figure 31: Speaker with amplifier reference circuit .......................................................................37

Figure 32: Reference circuit of the 8-pin SIM card holder............................................................. 39

Figure 33: Reference circuit of the 6-pin SIM card holder............................................................. 40

Figure 34: Molex 91228 SIM card holder ......................................................................................41

Figure 35: Amphenol C707 10M006 5122 SIM card holder..........................................................42

Figure 36: PCM reference circuit ...................................................................................................44

Figure 37: LCD reference circuit....................................................................................................44

Figure 38: SD reference circuit.......................................................................................................44

Figure 39: 25 keys reference circuit................................................................................................45

Figure 40: 50 keys reference circuit................................................................................................46

Figure 41: Keypad reference circuit................................................................................................46

Figure 42: Keypad detected ............................................................................................................46

Figure 43: Reference circuit of PWM driver buzzer.......................................................................49

Figure 44: Reference circuit of NETLIGHT...................................................................................50

Figure 45: LED driver reference circuit..........................................................................................51

Figure 46: BPI_BUS1 signal during transmit burst........................................................................52

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SIM800H_Hardware_Design_V1.01 9 2013-08-20

Figure 47: GSM antenna matching circuit......................................................................................53

Figure 48: GSM simple antenna matching circuit ..........................................................................53

Figure 49: Bluetooth antenna matching circuit...............................................................................54

Figure 50: FM antenna matching circuit......................................................................................... 54

Figure 51: GND pin of the earphone use to be the FM antenna interface ......................................54

Figure 52: Pin assignment...............................................................................................................55

Figure 53: Recommended PCB layout ...........................................................................................57

Figure 54: Top and bottom view of SIM800H ............................................................................... 63

Figure 55: Typical solder reflow profile.........................................................................................63

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SIM800H_Hardware_Design_V1.01 10 2013-08-20

Version History

Date Version Description of change Author

2013-08-01 1.00 Origin Jialin.song; Ya.li

2013-08-20 1.01 Update figure 15, figure 23, figure 32, figure 54

Update Bluetooth matching (R201 is 1.2nH, C202 is 1.5pF)

Update 7.3 and 7.4 paragraph

Change 300us to 105ms in the table 6

Update table 1,table 7

Jialin.song; Ya.li

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