SIM Tech SIMCom SIM800H Hardware Design

SIMCOM CONFIDENTIAL FILE

SIM800H_Hardware Design_V2.03

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SIMCOM CONFIDENTIAL FILE

Document Title

Version

Date

Status

Document Control ID

SIM800H_Hardware Design_V2.03

V2.03

2016-10-10

Release

SIM800H_Hardware Design_V2.03

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.

Copyright

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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SIMCOM CONFIDENTIAL FILE

Contents

Table Index ................................................................................................................... 6

Figure Index ................................................................................................................. 8

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

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

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

2.1. SIM800H ............................................................................................................................. 11

2.2. SIM800H Key Features ...................................................................................................... 11

2.3. Operating Mode .................................................................................................................. 13

2.4. Functional Diagram............................................................................................................. 14

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

3.1. Pin Out Diagram ................................................................................................................. 15

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

3.3. Package Dimensions ........................................................................................................... 18

4. Application Interface ......................................................................................... 20

4.1. Power Supply ...................................................................................................................... 20

4.1.1. Power Supply Pin ................................................................................................................................ 21

4.1.2. Monitoring Power Supply ................................................................................................................... 22

4.2. Power on/off Scenarios ....................................................................................................... 22

4.2.1. Power on SIM800H ............................................................................................................................. 22

4.2.2. Power down SIM800H ........................................................................................................................ 23

4.2.3. Reset Function ..................................................................................................................................... 24

4.3. Power Saving Mode ............................................................................................................ 25

4.3.1. Minimum Functionality Mode ............................................................................................................ 26

4.3.2. Sleep Mode 1 (AT+CSCLK=1) .......................................................................................................... 26

4.3.3. Wake Up SIM800H from Sleep Mode 1 ............................................................................................. 26

4.3.4. S

4.3.5. Wake Up SIM800H from Sleep Mode 2 ............................................................................................. 27

4.4. RTC Backup ........................................................................................................................ 27

4.5. Serial Port and USB Interface ............................................................................................. 28

4.5.1 Function of Serial Port ........................................................................................................................ 28

4.5.2 Serial Interfaces ................................................................................................................................... 29

4.5.3 Debug Interface ................................................................................................................................... 31

4.5.4 Software Upgrade ................................................................................................................................ 32

4.6. RI Behaviors ....................................................................................................................... 32

4.7. Audio Interfaces .................................................................................................................. 33

leep Mode 2 (AT+CSCLK=2) .......................................................................................................... 26

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4.7.1. Speaker Interfaces Configuration ........................................................................................................ 34

4.7.2. Microphone Interfaces Configuration ................................................................................................. 35

4.7.3. Audio Electronic Characteristic .......................................................................................................... 35

4.7.4. TDD .................................................................................................................................................... 35

4.8. SIM Card Interface.............................................................................................................. 36

4.8.1. SIM Card Application ......................................................................................................................... 36

4.8.2. SIM Card Design Guide ...................................................................................................................... 37

4.8.3. Design Considerations for SIM Card Holder ...................................................................................... 37

4.9. PCM Interface ..................................................................................................................... 39

4.9.1. PCM reference circuit ......................................................................................................................... 40

4.10. Keypad Interface ................................................................................................................. 41

4.11. I2C Bus ............................................................................................................................... 43

4.12. General Purpose Input/Output (GPIO) ............................................................................... 43

4.13. ADC .................................................................................................................................... 44

4.14. PWM ................................................................................................................................... 44

4.15. Network Status Indication ................................................................................................... 45

4.16. Operating Status Indication ................................................................................................. 45

4.17. LED Interface ...................................................................................................................... 46

4.18. RF Synchronization Signal ................................................................................................. 46

4.19. Antenna Interface ................................................................................................................ 47

4.19.1. GSM Antenna Interface ................................................................................................................... 47

4.19.2. Bluetooth Antenna Interface ............................................................................................................ 48

4.19.3. FM Antenna Interface ...................................................................................................................... 49

5. PCB Layout ........................................................................................................ 50

5.1 Pin Assignment ................................................................................................................... 50

5.2 Principle of PCB Layout ..................................................................................................... 51

5.2.1 Antenna Interface ................................................................................................................................ 51

5.2.2. Power Supply ...................................................................................................................................... 51

5.2.3 SIM Card Interface .............................................................................................................................. 51

5.2.4 Audio Interface .................................................................................................................................... 51

5.2.5 Others .................................................................................................................................................. 51

5.3 Recommended PCB Layout ................................................................................................ 52

6. Electrical, Reliability and Radio Characteristics ........................................... 53

6.1 Absolute Maximum Ratings ............................................................................................... 53

6.2 Recommended Operating Conditions ................................................................................. 53

6.3 Digital Interface Characteristics .......................................................................................... 53

6.4 SIM Card Interface Characteristics ..................................................................................... 54

6.5 SIM_VDD Characteristics .................................................................................................. 54

6.6 VDD_EXT Characteristics.................................................................................................. 54

6.7 VRTC Characteristics ......................................................................................................... 54

6.8 Current Consumption (VBAT=3.8V) ................................................................................. 55

6.9 Electro-Static Discharge...................................................................................................... 58

6.10 Radio Characteristics .......................................................................................................... 58

6.10.1. Module RF Output Power ................................................................................................................ 58

6.10.2. Module RF Receive Sensitivity ....................................................................................................... 59

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6.10.3. Module Operating Frequencies ........................................................................................................ 59

7. Manufacturing ................................................................................................... 60

7.1. Top and Bottom View of SIM800H ................................................................................... 60

7.2. Typical Solder Reflow Profile ............................................................................................ 60

7.3. The Moisture Sensitivity Level ........................................................................................... 61

7.4. Baking Requirements .......................................................................................................... 61

8. Appendix ............................................................................................................. 62

I. Related Documents ............................................................................................................. 62

II. Terms and Abbreviations .................................................................................................... 63

III. Safety Caution ..................................................................................................................... 65

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SIMCOM CONFIDENTIAL FILE

Table Index

TABLE 1: MODULE INFOR M ATI O N ........................................................................................................................... 11

TABLE 2: SIM800H KEY FEATURES ........................................................................................................................... 11

TABLE 3: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE ............................ 13

TABLE 4: OVERVIEW OF OPERATING MODES ........................................................................................................ 13

TABLE 5: PIN DESCRIPTION ....................................................................................................................................... 16

TABLE 6: RECOMMENDED ZENER DIODE .............................................................................................................. 20

TABLE 7: ELECTRONIC CHARACTERISTIC OF THE RESET PIN .......................................................................... 25

TABLE 8: THE CURRENT CONSUMPTION OF MINIMUM FUNCTIONALITY MODE (BS-PA-MFRMS=9) ...... 26

TABLE 9: SERIAL PORT AND USB PIN DEFINITION ............................................................................................... 28

TABLE 10: SERIAL PORT CHARACTERISTICS ......................................................................................................... 28

TABLE 11: VBUS OPERATION VOLTAGE .................................................................................................................. 31

TABLE 12: RI BEHAVIORS ........................................................................................................................................... 32

TABLE 13: AUDIO INTERFACE DEFINITION ............................................................................................................ 33

TABLE 14: PERFORMANCE OF AUDIO AMPLIFIER ................................................................................................ 34

TABLE 15: MICROPHONE INPUT CHARACTERISTICS........................................................................................... 35

TABLE 16: AUDIO OUTPUT CHARACTERISTICS .................................................................................................... 35

TABLE 17: SIM PIN DEFINITION ................................................................................................................................. 36

TABLE 18: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) .............................................................................. 38

TABLE 19: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER) ....................................................................... 39

TABLE 20: PCM PIN DEFINITION ............................................................................................................................... 39

TABLE 21: PCM SPECIFICATION ................................................................................................................................ 40

TABLE 22: PIN DEFINITION OF THE KEYPAD INTERFACE ................................................................................... 42

TABLE 23: PIN DEFINITION OF THE I2C ................................................................................................................... 43

TABLE 24: PIN DEFINITION OF THE GPIO ................................................................................................................ 43

TABLE 25: PIN DEFINITION OF THE ADC ................................................................................................................. 44

TABLE 26: ADC SPECIFICATION ................................................................................................................................ 44

TABLE 27: PIN DEFINITION OF THE PWM ............................................................................................................... 44

TABLE 28: BUZZER CHARACTERISTICS .................................................................................................................. 45

TABLE 29: PIN DEFINITION OF THE NETLIGHT ..................................................................................................... 45

TABLE 30: STATUS OF THE NETLIGHT PIN .............................................................................................................. 45

TABLE 31: PIN DEFINITION OF THE STATUS ........................................................................................................... 46

TABLE 32: PIN DEFINITION OF THE LED ................................................................................................................. 46

TABLE 33: ISINK SPECIFICATION .............................................................................................................................. 46

TABLE 34: DEFINITION OF THE RF_SYNC PIN........................................................................................................ 46

TABLE 35: RECOMMENDED TRANSIENT VOLTAGE SUPPRESSOR .................................................................... 48

TABLE 36: ABSOLUTE MAXIMUM RATINGS ........................................................................................................... 53

TABLE 37: RECOMMENDED OPERATING CONDITIONS ....................................................................................... 53

TABLE 38: DIGITAL INTERFACE CHARACTERISTICS ........................................................................................... 53

TABLE 39: SIM CARD INTERFACE CHARACTERISTICS ........................................................................................ 54

TABLE 40: SIM_VDD CHARACTERISTICS ................................................................................................................ 54

TABLE 41: VDD_EXT CHARACTERISTICS ............................................................................................................... 54

TABLE 42: VRTC CHARACTERISTICS ....................................................................................................................... 54

TABLE 43: CURRENT CONSUMPTION ...................................................................................................................... 55

TABLE 44: BLUETOOTH CHARACTERISTICS .......................................................................................................... 56

TABLE 45: CURRENT CONSUMPTION OF BLUETOOTH ........................................................................................ 57

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TABLE 46: THE ESD CHARACTERISTICS (TEMPERATURE: 25℃, HUMIDITY: 45 %) ....................................... 58

TABLE 47: GSM850 AND EGSM900 CONDUCTED RF OUTPUT POWER .............................................................. 58

TABLE 48: DCS1800 AND PCS1900 CONDUCTED RF OUTPUT POWER ............................................................... 59

TABLE 49: CONDUCTED RF RECEIVE SENSITIVITY ............................................................................................. 59

TABLE 50: OPERATING FREQUENCIES ..................................................................................................................... 59

TABLE 51: MOISTURE SENSITIVITY LEVEL AND FLOOR LIFE ........................................................................... 61

TABLE 52: BAKING REQUIREMENTS ....................................................................................................................... 61

TABLE 53: RELATED DOCUMENTS ........................................................................................................................... 62

TABLE 54: TERMS AND ABBREVIATIONS ................................................................................................................ 63

TABLE 55: SAFETY CAUTION ..................................................................................................................................... 65

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SIMCOM CONFIDENTIAL FILE

Figure Index

FIGURE 1: SIM800H FUNCTIONAL DIAGRAM ......................................................................................................... 14

FIGURE 2: PIN ASSIGNMENT (TOP VIEW) ................................................................................................................ 15

FIGURE 3: DIMENSIONS OF SIM800H (UNIT: MM) ................................................................................................. 18

FIGURE 4: RECOMMENDED PCB FOOTPRINT OUTLINE (UNIT: MM) ................................................................ 19

FIGURE 5: REFERENCE CIRCUIT OF THE VBAT INPUT......................................................................................... 20

FIGURE 6: REFERENCE CIRCUIT OF THE LDO POWER SUPPLY ......................................................................... 20

FIGURE 7: REFERENCE CIRCUIT OF THE DC-DC POWER SUPPLY ..................................................................... 21

FIGURE 8: VBAT VOLTAGE DROP DURING TRANSMIT BURST ........................................................................... 21

FIGURE 9: THE MINIMAL VBAT VOLTAGE REQUIREMENT AT VBAT DROP .................................................... 22

FIGURE 10: POWERED ON/OFF MODULE USING TRANSISTOR .......................................................................... 22

FIGURE 11: POWERED ON/OFF MODULE USING BUTTON .................................................................................. 22

FIGURE 12: TIMING OF POWER ON MODULE ......................................................................................................... 23

FIGURE 13: TIMING OF POWER DOWN SIM800H BY PWRKEY ........................................................................... 23

FIGURE 14:TIMING OF RESTART SIM800H .............................................................................................................. 24

FIGURE 15: RESET CIRCUIT ........................................................................................................................................ 25

FIGURE 16: RESET TIMING SEQUENCE .................................................................................................................... 25

FIGURE 17: RTC SUPPLY FROM CAPACITOR ........................................................................................................... 27

FIGURE 18: RTC SUPPLY FROM NON-CHARGEABLE BATTERY.......................................................................... 27

FIGURE 19: RTC SUPPLY FROM RECHARGEABLE BATTERY .............................................................................. 27

FIGURE 20: CONNECTION OF THE SERIAL INTERFACES ..................................................................................... 29

FIGURE 21: RESISTOR MATCHING CIRCUIT ........................................................................................................... 30

FIGURE 22: DIODE ISOLATION CIRCUIT .................................................................................................................. 30

FIGURE 23: TX LEVEL MATCHING CIRCUIT ........................................................................................................... 30

FIGURE 24: RX LEVEL MATCHING CIRCUIT ........................................................................................................... 31

FIGURE 25: USB REFERENCE CIRCUIT .................................................................................................................... 31

FIGURE 26: CONNECTION FOR SOFTWARE UPGRADING AND DEBUGGING .................................................. 32

FIGURE 27: RI BEHAVIOUR OF VOICE CALLING AS A RECEIVER ...................................................................... 33

FIGURE 28: RI BEHAVIOUR OF URC OR RECEIVE SMS ........................................................................................ 33

FIGURE 29: RI BEHAVIOUR AS A CALLER ............................................................................................................... 33

FIGURE 30: SPEAKER REFERENCE CIRCUIT .......................................................................................................... 34

FIGURE 31: SPEAKER WITH AMPLIFIER REFERENCE CIRCUIT ......................................................................... 35

FIGURE 32: REFERENCE CIRCUIT OF THE 8-PIN SIM CARD HOLDER ............................................................... 36

FIGURE 33: REFERENCE CIRCUIT OF THE 6-PIN SIM CARD HOLDER ............................................................... 37

FIGURE 34: MOLEX 91228 SIM CARD HOLDER....................................................................................................... 38

FIGURE 35: AMPHENOL C707 10M006 512 SIM CARD HOLDER ........................................................................... 39

FIGURE 36: PCM REFERENCE CIRCUIT .................................................................................................................... 40

FIGURE 37: 25 KEYS REFERENCE CIRCUIT ............................................................................................................. 41

FIGURE 38: 50 KEYS REFERENCE CIRCUIT ............................................................................................................. 41

FIGURE 39: KEYPAD REFERENCE CIRCUIT ............................................................................................................ 42

FIGURE 40: KEYPAD DETECTED ............................................................................................................................... 42

FIGURE 41: GPIO TIMING SEQUENCES .................................................................................................................... 43

FIGURE 42: REFERENCE CIRCUIT OF PWM DRIVER BUZZER ............................................................................ 44

FIGURE 43: REFERENCE CIRCUIT OF NETLIGHT................................................................................................... 45

FIGURE 44: LED DRIVER REFERENCE CIRCUIT ..................................................................................................... 46

FIGURE 45: RF_SYNC SIGNAL DURING TRANSMIT BURST ................................................................................ 47

FIGURE 46: GSM ANTENNA MATCHING CIRCUIT.................................................................................................. 47

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FIGURE 47: GSM SIMPLE ANTENNA MATCHING CIRCUIT .................................................................................. 48

FIGURE 48: BLUETOOTH ANTENNA MATCHING CIRCUIT .................................................................................. 48

FIGURE 49: FM ANTENNA M ATC HI NG CIRCUIT .................................................................................................... 49

FIGURE 50: GND PIN OF THE EARPHONE USE TO BE THE FM ANTENNA INTERFACE.................................. 49

FIGURE 51: PIN ASSIGNMENT .................................................................................................................................... 50

FIGURE 52: RECOMMENDED PCB LAYOUT ............................................................................................................ 52

FIGURE 53: TOP AND BOTTOM VIEW OF SIM800H ................................................................................................ 60

FIGURE 54: TYPICAL SOLDER REFLOW PROFILE OF LEAD-FREE PROCESSES .............................................. 60

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Temperature Power

SIMCOM CONFIDENTIAL FILE

Version History

Date Version Description of change Author

2013-08-01 1.00 Origin

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

2014-07-03 2.01 Update Figure 12,Figure 13,Figure 20

Update Table 7

Update Serial port baud rates

Add note of the SIM design

Add notes of the KEYPAD design

Add “4.2.2.5 Restart SIM800H/L by PWRKEY Pin”

Add “4.3.4 and 4.3.5” sleep mode 2(AT+CSCLK=2)

Add “4.18.1 RF_SYNC Multiplexing Function ”

Modify max value of the VBUS in table 42

Add table 50 and table 51

2015-07-27 V2.02 Modify KBC0 described in table 5

Modify Figure 12

Modify Table 44 “Bluetooth specification Version3.0”

Modify Table 38 “Parameter”

Jialin.song; Ya.li

Jialin.song

2016-10-10 V2.03 Update Figure 46, 47, add TVS for ESD protection

Delete the multiplexing function

Add note of the over-voltage or under-voltage power down

Add note of the ADC function

Update Figure 4

Delete 4.2.2.4 Over-Temperature or Under-

Down

Ajuan.zhu

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BT

Support

FLASH

32Mbit

SIMCOM CONFIDENTIAL FILE

1. Introduction

This document describes SIM800H hardware interface in great detail. The document can help customer to

quickly understand SIM800H interface specifications, electrical and mechanical details. With the help of this

document and other SIM800H application notes, customer guide, customers can use SIM800H to design various

applications quickly.

2. SIM800H Overview

SIM800H is a quad-band GSM/GPRS module, that works on frequencies GSM850MHz, EGSM900MHz,

DCS1800MHz and PCS1900MHz.

With a tiny configuration of 17.8*15.8*2.4mm, SIM800H can meet almost all the space requirements in

customer applications, such as smart phone, PDA and other mobile devices.

SIM800H is a LGA package with 88 pads, and provides all hardware interfaces between the module and

customers’ boards.

 Support 5*5*2 keypads

 One full modem serial port, customer can configure two serial ports

 One USB, the USB interfaces can debug, download software

 Audio channel which includes two microphone input; a receiver output and a speaker output

 Programmable general purpose input and output.

 A SIM card interface

 Support Bluetooth

 Support FM

 Support one PWM

SIM800H is designed with power saving technique so that the current consumption is as low as 1.04mA in

sleep mode.

2.1. SIM800H

Table 1: Module information

SIM800H

GSM 850,900,1800 and 1900MHz

RAM 32Mbit

2.2. SIM800H Key Features

Table 2: SIM800H key features

Feature Implementation

Power supply 3.4V ~4.4V

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Storage temperature -45°C ~ +90°C

Support Packet Broadcast Control Channel (PBCCH)

MT, MO, CB, Text and PDU mode

External antenna

Antenna pad

Phonebook management

Support phonebook types: SM, FD, LD, RC, ON, MC.

SIM application toolkit

GSM 11.14 Release 99

Timing functions

Use AT command set

SIMCOM CONFIDENTIAL FILE

Power saving Typical power consumption in sleep mode is 1.04mA (BS_PA_MFRMS=9 )

 Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. SIM800H can

Frequency bands

search the 4 frequency bands automatically. The frequency bands can also be

set by AT command “AT+CBAND”. For details, please refer to document [1].

 Compliant to GSM Phase 2/2+

Transmitting power

GPRS connectivity

Temperature range

Data GPRS

USSD  Unstructured Supplementary Services Data (USSD) support

SMS

SIM interface Support SIM card: 1.8V, 3V

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

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

 GPRS multi-slot class 12（default）

 GPRS multi-slot class 1~12 (option)

 Normal operation: -40°C ~ +85°C



 GPRS data downlink transfer: max. 85.6 kbps

 GPRS data uplink transfer: max. 85.6 kbps

 Coding scheme: CS-1, CS-2, CS-3 and CS-4

 PA P protocol for PPP connect

 Integrate the TCP/IP protocol.



 SMS storage: SIM card

Audio features

Serial port and debug

port

Speech codec modes:

 Half Rate (ETS 06.20)

 Full Rate (ETS 06.10)

 Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)

 Adaptive multi rate (AMR)

 Echo Cancellation

 Noise Suppression

Serial port:

 Default one Full modem serial port

 1200bps to 460800bps.

 Can be used for AT commands or data stream.

 Support RTS/CTS hardware handshake and software ON/OFF flow control.

 Multiplex ability according to GSM 07.10 Multiplexer Protocol.

 Autobauding supports baud rate from 1200 bps to 115200bps.

 upgrading firmware

Debug port:

 USB_DN and USB_DP

 Can be used for debugging and upgrading firmware.

Real time clock Support RTC

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Weight:1.35g

Firmware upgrade

Main serial port or USB port.(recommend to use USB port)

Coding scheme

1 timeslot

2 timeslot

4 timeslot

ons of sleep

on air and no hardware interrupt (such as

In this case, the current consumption of module will reduce to the minimal

In sleep mode, the module can still receive paging message and SMS.

or using the PWRKEY.

The power management unit shuts down the power supply for the baseband part of the

module, and only the power supply for the RTC is remained. Software is not active. The

serial port is not accessible. Power supply (connected to VBAT) remains applied.

AT command “AT+CFUN” can be used to set the module to a minimum functionality mode

or the SIM card will not be accessible, or both RF part and SIM card will be closed, and the

serial port is still accessible. The power consumption in this mode is lower than normal

mode.

SIMCOM CONFIDENTIAL FILE

Physical characteristics

Table 3: Coding schemes and maximum net data rates over air interface

CS-1 9.05kbps 18.1kbps 36.2kbps

CS-2 13.4kbps 26.8kbps 53.6kbps

CS-3 15.6kbps 31.2kbps 62.4kbps

CS-4 21.4kbps 42.8kbps 85.6kbps

Size: 17.8*15.8*2.4mm

2.3. Operating Mode

The table below summarizes the various operating modes of SIM800H.

Table 4: Overview of operating modes

Mode Function

Normal

operation

GSM/GPRS

SLEEP

GSM

IDLE

GSM

TALK

GPRS

STANDBY

GPRS

DATA

Module will automatically go into sleep mode if the conditi

mode are enabling and there is no

GPIO interrupt or data on serial port).

level.

Software is active. Module is registered to the GSM network, and the

module is ready to communicate.

Connection between two subscribers is in progress. In this case, the power

consumption depends on network settings such as DTX off/on,

FR/EFR/HR, hopping sequences, antenna.

Module is ready for GPRS data transfer, but no data is currently sent or

received. In this case, power consumption depends on network settings and

GPRS configuration.

There is GPRS data transfer (PPP or TCP or UDP) in progress. In this case,

power consumption is related with network settings (e.g. power control

level); uplink/downlink data rates and GPRS configuration (e.g. used

multi-slot settings).

Normal power down by sending AT command “AT+CPOWD=1”

Power down

Minimum

functionality

mode

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without removing the power supply. In this mode, the RF part of the module will not work

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Analog base

band

Digital base

band

Power management unit

Radio

Frequency

Power

Supply

Analog Interface

Digital Interface

UART

SIM

GPIOs

RTC

Audio

ADC

RF

FM

USB

KEY

PCM

BT

SIMCOM CONFIDENTIAL FILE

2.4. Functional Diagram

The following figure shows a functional diagram of SIM800H:

 GSM baseband

 GSM RF

 Antenna interface

 Other interface

Figure 1: SIM800H functional diagram

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GND

VBAT

GPIO1

GND

ISINK0

USB_DP

USB_

DP

GND

STA

TUS

ISINK1

VBUS

ADC

RESET

GND

PCM_

IN

KBR4

KBR0

KBR1

KBC0

GND

PWM

KBR2

KBC3

VRTC

GSM_

ANT

RXD

PWR

KEY

CTS

TXDRTS

SCL

SDA

DTR

RF_

SYNC

DCD

RI

PCM_

SYNC

NETLI

GHT

SPK

1P

MIC

1P

MIC

1N

MIC2P

MIC

2N

GND

SIM_ VDD

SIM_

RST

SPK

1N

SPK

2N

SPK2P

BT_

ANT

SIM_

CLK

SIM_

DET

SIM_

DATA

VDD_

EXT

GND

86

GND

85

GND

84

GND

87

GND

88

GND

83

GND

80

GND

81

GND

82

GND

1

2

3

4

5

6

7

8

9

10

FM_

ANTN

FM_

ANTP

USB_

DN

GNDGND

GND

GNDGND

GND

78

GND

79

GND

21

3142

43

44

45

46

47

48

49

50

62

61

64

63

66

65

68

67

51 52 53 54 55 56 57 58

59

72 71

70

69

76

75 74 73

60

11 12 13 14 15 16

17

18 19 20

40 39 38 37 36 35 34 33 3241

77

GND

22

30

23

24

25

26

27

28

29

PCM_

CLK

GPIO3

KBC2

KBC4

KBR3

KBC1

PCM_

OUT

GPIO2

SIMCOM CONFIDENTIAL FILE

3. Package Information

3.1. Pin Out Diagram

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Figure 2: Pin assignment (Top view)

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Power supply

VB AT

1,42

I

Power supply

It is recommended to

If these pins are unused,

PWRKEY should be pulled low at

least 1 second and then released to

Internally pulled up to

If these pins are unused,

PCM_SYNC

65

O

KBC2

22 I KBC1

25

I

SIMCOM CONFIDENTIAL FILE

3.2. Pin Description

Table 5: Pin description

Pin name Pin number I/O Description Comment

VRTC 56 I/O Power supply for RTC

VDD_EXT 18 O 2.8V power output

2,6,8,35,37,38,39,

41,43,44,45,58,67

GND

Power on/down

PWRKEY 48 I

Audio interfaces

MIC1P 52

MIC1N 12

SPK1P 53

SPK1N 13

MIC2P 9

MIC2N 10

,71,72,73,76,77,7

8,79,80,81,82,83,

84,85,86,87,88

Ground

power on/down the module.

I Differential audio input

O Differential audio output

I Differential audio input

connect with a battery or a

capacitor (e.g. 4.7uF).

keep open.

GND for VBAT recommend

to use 2,43,44,45pin

V B AT.

keep open.

SPK2P 51

SPK2N 11

PCM interface

PCM_CLK 29 O

PCM_OUT 30 O

PCM_IN 66 I

Keypads interface

KBC4 24 I

KBC3 21 I

KBC0 20 I

KBR4 63 O

KBR3 23 O

SIM800H _Hardware Design_V2.03 16 2016-10-10

O Differential audio output

PCM interface for digital audio

Support up to 50 buttons (5*5*2)

keep open.

If these pins are unused, keep open.（Please make

sure pin20 at high level when power on）

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GPIO2

27

I/O

DTR

69 I Data terminal ready

If these pins are unused,

RI

68 O Ring indicator

RXD

31 I Receive data

Debug interface

If these pins are unused,

USB_DP

59

I/O

If these pins are unused,

PWM

If these pins are unused,

keep open.

I2C

If these pins are unused,

SCL

74 O Open drain output

Voltage supply for SIM card.

Support 1.8V or 3V SIM card

should be protected against

ESD with a TVS diode

SIM_CLK

55 O SIM clock

If these pins are unused,

keep open.

Antenna interface

GSM_ANT

40

I/O

Connect GSM antenna

SIMCOM CONFIDENTIAL FILE

KBR2 61 O

KBR1 60 O

KBR0 62 O

GPIO

GPIO1 3 I/O

Programmable general purpose input

and output

GPIO3 28 I/O

NETLIGHT 64 O Network status

S TAT US 4 O Power on status

Serial port

DCD 70 O Data carrier detect

CTS 34 O Request to send

RTS 33 I Clear to send

TXD 32 O Transmit data

VBUS 7 I

Debug and download

USB_DN 19 I/O

ADC

ADC 50 I

PWM 26 O Pulse-width modulation

SDA 75 I/O Open drain output

10bit general analog to digital

converter

keep open.

SIM card interface

SIM_VDD 16 O

SI M_ D ATA 14 I/O SIM data input/output

SIM_RST 15 O SIM reset

SIM_DET 54 I SIM card detection

BT_ANT 36 I/O Connect Bluetooth antenna Only SIM800H

FM_ANTP 17 I Differential antenna for FM

SIM800H _Hardware Design_V2.03 17 2016-10-10

All signals of SIM interface

array.

Smart Machine Smart Decision

SIMCOM CONFIDENTIAL FILE

FM_ANTN 57 I Differential antenna for FM

Synchronizing signal of RF

RF_SYNC 5 O Synchronizing signal of RF

Other

RESET 49 I Reset input(Active low)

ISINK1 46 I Drive keypad backlight

ISINK0 47 I Drive LCD backlight

3.3. Package Dimensions

Figure 3: Dimensions of SIM800H (Unit: mm)

SIM800H _Hardware Design_V2.03 18 2016-10-10

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SIMCOM CONFIDENTIAL FILE

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

SIM800H _Hardware Design_V2.03 19 2016-10-10

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VBAT

5.1V 500mW

C

A

C

B

33pF

10pF

Vendor

Part number

Power(watts)

Packages

1

On semi

MMSZ5231BT1G

500mW

SOD123

3

Vishay

MMSZ4689-V

500mW

SOD123

Vin

Vout

GND

FB

3

+

PWR_CTRL

R102

R101

VBAT

100K

43K

+

C103

330uF

C104

100nF

U101

MIC29302

5

4

1

2

C101 C102

100uF

1uF

DC INPUT

R103 470R

On/Off

SIMCOM CONFIDENTIAL FILE

4. Application Interface

4.1. Power Supply

The power supply range of SIM800H 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 VBAT pins.

Figure 5: Reference circuit of the VBAT input

Table 6: Recommended zener diode

2 Prisemi PZ3D4V2H 500mW SOD323

4 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.

SIM800H _Hardware Design_V2.03 20 2016-10-10

Figure 6: Reference circuit of the LDO power supply

Smart Machine Smart Decision

Vin

Vout

FB

U101

1

2

3

4

5

LM2596-ADJ

+

100uH

MBR360

L101

C101

+

C102

D102 C103

R102

R101

FB101

330uF

VBAT

2.2K

1K

100uF

1uF

C104

100nF

270R

DC INPUT

PWR_CTRL

GND

On/Off

577us 4.615ms

Burst:2A

I

VBAT

Max:350mV

SIMCOM CONFIDENTIAL FILE

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 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

Another VBAT bypass capacitor C

=100µF tantalum capacitor (ESR=0.7Ω),

A

=1µF.

B

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.

SIM800H _Hardware Design_V2.03 21 2016-10-10

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VBAT

MIN:3.0V

4.7K

47K

Turn on/off

impulse

PWRKEY

Power

on/down logic

100K

VBAT

Module

1K

PWRKEY

Power

on/down logic

100K

VBAT

Module

1K

SIMCOM CONFIDENTIAL FILE

Figure 9: The minimal VBAT voltage requirement at VBAT drop

Note: Hardware power down voltage is 3.0V.

4.1.2. Monitoring Power Supply

AT command “AT+CBC” can be used to monitor the VBAT voltage. For detail, please refer to document [1].

4.2. Power on/off Scenarios

4.2.1. Power on SIM800H

Customer can power on SIM800H by pulling down the PWRKEY pin for at least 1 second and release. This pin

is already pulled up to VBAT in the module internal, so external pull up is not necessary. Reference circuit is

shown as below.

Figure 10: Powered on/off module using transistor

Figure 11: Powered on/off module using button

The power on timing is illustrated as in the following figure.

SIM800H _Hardware Design_V2.03 22 2016-10-10

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Underfined

Active

1.2s

VBAT

PWRKEY

(

INPUT)

t>3s

VDD_EXT

STATUS

t>1s

Serial port

T>1.5s

V

IL

<0.7V

PWRKEY

t>1.6s

VDD_EXT

STATUS

1.5s<t<33s

Serial

Active

Undefined

(INPUT)

V

IL

<0.7V

SIMCOM CONFIDENTIAL FILE

Figure 12: Timing of power on module

When power on procedure is completed, SIM800H will send following URC to indicate that the module is ready

to operate at fixed baud rate.

RDY

This URC does not appear when autobauding function is active.

Note: Customer can use AT command “AT+IPR=x” to set a fixed baud rate and save the configuration to non-volatile flash

memory. After the configuration is saved as fixed baud rate, the Code “RDY” should be received from the serial port every time

when SIM800H is powered on. For details, please refer to the chapter “AT+IPR” in document [1].

4.2.2. Power down SIM800H

SIM800H will be powered down in the following situations：

 Normal power down procedure: power down SIM800H by the PWRKEY pin.

 Normal power down procedure: power down SIM800H by AT command “AT+CPOWD=1”.

 Abnormal power down: over-voltage or under-voltage automatic power down.

4.2.2.1. Power down SIM800H by the PWRKEY Pin

Customer can power down SIM800H by pulling down the PWRKEY pin for at least 1.5 second and release.

Please refer to the power on circuit. The power down timing is illustrated in the following figure.

This procedure makes the module log off from the network and allows the software to enter into a secure state to

SIM800H _Hardware Design_V2.03 23 2016-10-10

Figure 13: Timing of power down SIM800H by PWRKEY

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PWRKEY

T

2

≥2s

STATUS

T

3

>800ms

1.5s<T

1

<2s

SIMCOM CONFIDENTIAL FILE

save data before completely shut down. Before the power down procedure, the module will send URC:

NORMAL POWER DOWN

At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode

can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

4.2.2.2. Power down SIM800H by AT Command

SIM800H can be powered down by AT command “AT+ C PO WD = 1 ”. This procedure makes the module log off

from the network and allows the software to enter into a secure state to save data before completely shut down.

Before the completion of the power down procedure, the module will send URC:

NORMAL POWER DOWN

At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode

can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

Note:For detail about AT command “AT+CPOWD”, please refer to document [1].

4.2.2.3. Over-Voltage or Under-Voltage Power Down

The module software monitors the VBAT voltage constantly.

If the voltage ≤ 3.5V, the following URC will be reported:

UNDER-VOLTAGE WARNNING

If the voltage ≥ 4.3V, the following URC will be reported:

OVER-VOLTAGE WARNNING

If the voltage < 3.4V, the following URC will be reported, and the module will be automatically powered down.

UNDER-VOLTAGE POWER DOWN

If the voltage > 4.4V, the following URC will be reported, and the module will be automatically powered down.

OVER-VOLTAGE POWER DOWN

At this moment, AT commands can not be executed any more, and only the RTC is still active. Power down mode

can also be indicated by STATUS or VDD_EXT, which is at low level at this time.

4.2.2.4. Restart SIM800H by PWRKEY Pin:

When the module works normally, if the customer wants to restart the module, the time after STATUS pin

changed to low should be at least 800ms. The module needs enough time to power down completely.

Figure 14:Timing of restart SIM800H

4.2.3. Reset Function

SIM800H also has a RESET pin (pin 49) used to reset the module. This function is used as an emergency reset

only when AT command “AT +C P OW D= 1 ” and the PWRKEY pin has no effect. Customer can pull the RESET

SIM800H _Hardware Design_V2.03 24 2016-10-10

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2.8V.

RESET

Circuit

4.7K

RESET

Module

47K

Pin name

Symbol

Min

Typ

Max

Unit

t>105ms

RESET

800ms

2.7s

t<400us

VDD_EXT

STATUS

VIL<0.6V

V

IH

>2.4V

SIMCOM CONFIDENTIAL FILE

pin to ground, then the module will reset.

This pin is already isolated in the module, so the external isolation is not necessary. Following figure is internal

circuit of the RESET pin.

Figure 15: Reset circuit

The typical value of RESET pin at High level is 2.8V, so for the 3V or 3.3V, customer could use MCU’s GPIO to

driver this pin directly, cascading some resistors could enhance the ESD performance but the value should not be

too big; otherwise the level of RESET could be lower than threshold value; RESET hardware parameters can

refer to the table below:

Table 7: Electronic characteristic of the RESET pin

VIH 2.4 2.8 2.9 V

RESET

The reset scenarios are illustrated in the following figures.

VIL - - 0.6 V

Low power time 105 - ms

4.3. Power Saving Mode

SIM800H has two power saving modes: Minimum functionality mode and sleep mode. AT command

“AT+CSCLK=1”can be used to set SIM800H into sleep mode. AT command “AT+CFUN=<fun>“ can be used to

SIM800H _Hardware Design_V2.03 25 2016-10-10

Figure 16: Reset timing sequence

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<fun>

Current consumption(mA) (sleep mode)

0

0.83

4

0.92

SIMCOM CONFIDENTIAL FILE

set SIM800H into minimum functionality. When SIM800H is in sleep mode and minimum functionality mode,

the current of module is lowest.

4.3.1. Minimum Functionality Mode

There are three functionality modes, which could be set by AT command “AT+CFUN=<fun>“. The command

provides the choice of the functionality levels <fun>=0,1,4.

 AT+CFUN=0： Minimum functionality.  AT+CFUN=1： Full functionality (default).  AT+CFUN=4： Flight mode (disable RF function).

Table 8: The current consumption of Minimum Functionality Mode (BS-PA-MFRMS=9)

1 1.04

Minimum functionality mode minimizes the current consumption to the lowest level. If SIM800H is set to

minimum functionality by “AT+CFUN=0”, the RF function and SIM card function will be disabled. In this

case, the serial port is still accessible, but all AT commands correlative to RF function and SIM card function

will not be accessible.

For detailed information about AT command “AT+CFUN=<fun>“, please refer to document [1].

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

Customer can control SIM800H module to enter or exit the sleep mode (AT+CSCLK=1) by DTR signal. When

DTR is in high level and without interrupt (on air and hardware such as GPIO interrupt or data in serial port),

SIM800H will enter sleep mode automatically. In this mode, SIM800H can still receive paging or SMS from

network but the serial port is not accessible.

4.3.3. Wake Up SIM800H from Sleep Mode 1

When SIM800H is in sleep mode 1(AT+CSCLK=1), the following methods can wake up the module:

 Pull down DTR pin.

The serial port will be active after DTR pin is pulled to low level for about 50ms.

 Receive a voice or data call from network.

 Receive a SMS from network.

 Receive external interrupt.

Note: After module has received incoming call or new SMS, serial port can report URC, but the serial port can not input AT

command. Only after the DTR pin is pulled to low level for 50ms, the serial port can input AT command.

4.3.4. Sleep Mode 2 (AT+CSCLK=2)

In this mode, SIM800H will continuously monitor the serial port data signal. When there is no data transfer over 5

seconds on the RXD signal and there is no on air and hardware interrupts (such as GPIO interrupt), SIM800H will

enter sleep mode 2 automatically. In this mode, SIM800H/L can still receive paging or SMS from network .

SIM800H _Hardware Design_V2.03 26 2016-10-10

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RTC Core

2.2K

Module

VRTC

Large-capacitance

Capacitor

RTC Core

2.2K

Module

VRTC

Non-chargeable

Backup Battery

RTC

Core

2.2K

Module

VRTC

Rechargeable

Backup Battery

SIMCOM CONFIDENTIAL FILE

4.3.5. Wake Up SIM800H from Sleep Mode 2

When SIM800H is in sleep mode 2 (AT+CSCLK=2), the following methods can wake up the module:

 Send data to SIM800H via main serial port (the first character will lose).

 Receive a voice or data call from network.

 Receive a SMS from network.

Note: Autobauding is default. It cannot enter sleep mode in the absence of synchronous serial port baud rate after module power

on.

4.4. RTC Backup

Current input for RTC when the VBAT is not supplied for the system. Current output for backup battery when

the VBAT power supply is in present and the backup battery is in low voltage state. The RTC power supply of

module can be provided by an external capacitor or a battery (non-chargeable or rechargeable) through the VRTC.

The following figures show various reference circuits for RTC back up.

 External capacitor backup

Figure 17: RTC supply from capacitor

 Non-chargeable battery backup

Figure 18: RTC supply from non-chargeable battery

 Rechargeable battery backup

SIM800H _Hardware Design_V2.03 27 2016-10-10

Figure 19: RTC supply from rechargeable battery

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VOH

2.4

2.8 - V

CTS

34

Request to send

RTS

33

Clear to send

RXD

31

Receive data

SIMCOM CONFIDENTIAL FILE

Note: The clock error becomes larger when VBAT is turned off and RTC circuit was supplied from the backup battery or the

external capacitor.

4.5. Serial Port and USB Interface

SIM800H default provides one unbalanced asynchronous serial ports. The module is designed as a DCE (Data

Communication Equipment). The following figure shows the connection between module and client (DTE).

Table 9: Serial port and USB pin definition

Pin name Pin number Function

DTR 69 Data terminal ready

RI 68 Ring indicator

DCD 70 Data carrier detect

Serial port

TXD 32 Transmit data

VBUS 7 USB power supply

Debug port

Note: Hardware flow control is disable by default. AT command “AT+IFC=2,2”can enable hardware flow control. AT command

“AT+IFC=0,0”can disable hardware flow control. For more details please refer to document [1].

Table 10: Serial port characteristics

Symbol Min Typ Max Unit

VIL -0.3 - 0.7 V

VIH 2.1 - 3.1 V

VOL - - 0.4 V

SIM800H module can support dual serial port function, that need execute AT command "AT+CMNRP=1"first.

Dual serial port including one full modem serial port and one three-wire serial port, pin definition is different with

standard definition of the Figure 2: Pin assignment (Top view) and Table 5: Pin description. For more details

please refer to Document [2].

Note: Only B05 and later version support dual serial port function.

USB_DP 59 USB data line positive

USB_DN 19 USB data line negative

4.5.1 Function of Serial Port

Serial port:

 Full mode device.

 Contains data lines TXD and RXD, hardware flow control lines RTS and CTS, status lines DTR, DCD and

SIM800H _Hardware Design_V2.03 28 2016-10-10

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TXD

RXD

RTS

CTS

DTR

DCD

RI

TXD

RXD

RTS

CTS

DTR

DCD

RING

Serial Port

Module(DCE)

Customer(DTE)

GND GND

SIMCOM CONFIDENTIAL FILE

RI.

 Serial port can be used for GPRS service and AT communication.

 Serial port supports the following baud rates:

1200, 2400, 4800, 9600, 19200, 38400, 57600,115200,230400 and 460800bps

 Autobauding only supports the following baud rates:

1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200bps

 The default setting is autobauding.

Autobauding allows SIM800H to automatically detect the baud rate of the host device. Pay more attention to the

following requirements:

 Synchronization between DTE and DCE:

When DCE powers on with autobauding enabled, it is recommended to send "AT" or "at" or "aT" or "At"

to synchronize the baud rate, until DTE receives the "OK" response, which means DTE and DCE are

correctly synchronized. For more information please refer to AT command "AT+IPR".

 Restrictions of autobauding operation:

The DTE serial port must be set at 8 data bits, no parity and 1 stop bit.

The URC such as "RDY", "+CFUN: 1" and "+CPIN: READY” will not be reported.

Note: Customer can use AT command “AT+IPR=x” to set a fixed baud rate and the setting will be saved to non-volatile flash

memory automatically. After the configuration is set as fixed baud rate, the URC such as "RDY", "+CFUN: 1" and "+CPIN:

READY” will be reported when SIM800H is powered on.

4.5.2

Serial Interfaces

The following figure shows the connection between module and client (DTE).

If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please

change the resistors in the following figure from 5.6K to 14K.

SIM800H _Hardware Design_V2.03 29 2016-10-10

Figure 20: Connection of the serial interfaces

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1K

5.6K

RXD

TXD

RTS

CTS

GPIO

EINT

DTE

(3.3V)

5.6K

1K

Module

TXD

RXD

RTS

CTS

DTR

DCD

RI

GND

TXD

RXD

Module DTE

TXD

RXD

VDD_EXT

10K

GND

VDD_EXT

4.7K

47K

TXD

4.7K

Module

VDD_EXT

RXD

VDD

DTE

SIMCOM CONFIDENTIAL FILE

Figure 21: Resistor matching circuit

If the voltage of UART is 3V or3.3V, the following reference circuits are recommended:

Figure 22: Diode isolation circuit

Note: please make sure the minimum of client high limit should be less than 2.8V minus the diode drop.

If the voltage of UART is 5V, the following reference circuits are recommended:

Figure 23: TX level matching circuit

SIM800H _Hardware Design_V2.03 30 2016-10-10

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VDD_EXT

4.7K

47K

4.7K

DTE

RXD

Module

VDD_EXT

TXD

VDD

Module

USB

USB_DP

USB _ DN

GND

22R

USB _ DP

USB_VBUS

VBUS

22 R

1uF

SIMCOM CONFIDENTIAL FILE

Figure 24: RX level matching circuit

Note: When Figure22, Figure 23 and Figure 24 are used for electrical level isolation, if customers use serial port to upgrade SW,

please note VDD_EXT has no voltage output during the upgrading process, LDO output could be used as VDD_EXT in the

figure, upgrading through USB port is recommended.

4.5.3 Debug Interface

SIM800H could achieve software debug function through USB interface. When powering on the module,

connect VBUS, USB_DP, USB_DN, and GND to PC, then install the driver following the prompts, a UART port

could be recognized by PC, customer could achieve the software Debug with this UART port.

SIMCom recommended the following connected diagram:

Figure 25: USB reference circuit

The TVS on USB data line should be less than 5pF, and traced by differential forms.

Note: please reserve the USB interface or test point for the further debugging

Table 11: VBUS operation voltage

Pin Min Typ Max Unit

VBUS 4.3 5.0 7.0 V

SIM800H _Hardware Design_V2.03 31 2016-10-10

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TXD

Module(DCE)

RXD

GND

PWRKEY

TXD

RXD

GND

Serial Port

PWRKEY

I/O Connector

The pin is changed to low. When any of the following events occur, the pin will be changed

The pin is changed to low, and kept low for 120ms when a SMS is received. Then it is

The pin is changed to low, and kept low for 120ms when some URCs are reported. Then it is

SIMCOM CONFIDENTIAL FILE

4.5.4 Software Upgrade

Customer could upgrade module’s firmware through USB or UART interface.

If upgrading through USB interface, it is necessary to power on SIM800H first, then connect VBUS, USB_DP,

USB_DN, and GND to PC. There is no need to operate PWRKEY pin in the whole procedure, when SIM800H

detects VBUS and could communicate normally with USB_DP and USB_DN, it will enter USB download mode

automatically.

If customer upgrades the software through UART interface, it is strongly recommended to lead the UART1_TXD,

UART1_RXD, GND and PWRKEY pin to IO connector for the upgrading, and PWRKEY pin should connect to

GND while upgrading. Refer to the following figure for debugging and upgrading software.

The UART interface supports the CMOS level. If customer connects the module to the computer, the level shifter

should be added between the DCE and DTE.

4.6. RI Behaviors

Table 12: RI behaviors

State RI response

Standby High

Voice call

SMS

Figure 26: Connection for software upgrading and debugging

to high:

（1）Establish the call （2）Hang up the call

changed to high.

URC

The behavior of the RI pin is shown in the following figure when the module is used as a receiver.

SIM800H _Hardware Design_V2.03 32 2016-10-10

changed to high. For more details, please refer to document [10].

Smart Machine Smart Decision

HIGH

LOW

Idle Ring

Hang up the call

Establish the call

RI

HIGH

LOW

Idle

RI

120ms

Receive SMS URC

HIGH

LOW

Idle

Ring

Establish

the call

Hang up

the call

Idle

RI

SPK1P

53

Main Audio output positive

MIC2P

9

Secondary Audio input positive

SIMCOM CONFIDENTIAL FILE

Figure 27: RI behaviour of voice calling as a receiver

Figure 28: RI behaviour of URC or receive SMS

However, if the module is used as caller, the RI will remain high. Please refer to the following figure.

Figure 29: RI behaviour as a caller

4.7. Audio Interfaces

SIM800H provides two analog inputs (MIC1P/1N; MIC2P/2N), which could be used for electret microphone.

The module also provides two analog outputs (SPK1P/1N; SPK2P/2N).

Table 13: Audio interface definition

Pin name Pin number Function

MIC1P 52 Main Audio input positive

MIC1N 12 Main Audio input negative

SPK1N 13 Main Audio output negative

MIC2N 10 Secondary Audio input negative

SPK2P 51 Secondary Audio output positive

Main

Secondary

SPK2N 11 Secondary Audio output negative

SIM800H _Hardware Design_V2.03 33 2016-10-10

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3.4V 8Ω THD+N=1%

0.53W

4.2V 8Ω THD+N=10%

1.08W

SPK1P/2P

Close to speaker

ESD

10pF

33pF

Module

SPK1N/2N

10pF

33pF

10pF

SIMCOM CONFIDENTIAL FILE

SPK1P/1N output can directly drive 32Ω receiver, SIM800H internal has class-AB audio amplifier, the following

table is class-AB performance:

Table 14: Performance of audio amplifier

Conditions Class-AB AMP

4.2V 8Ω THD+N=1% 0.87W

3.4V 8Ω THD+N=10% 0.65W

SPK2P/2N output can directly drive 8Ω speaker.

AT command “AT+CMIC” is used to adjust the input gain level of microphone. AT command “AT+SIDET”

is used to set the side-tone level. In addition, AT command “AT+CLVL” is used to adjust the output gain level.

For more details, please refer to document [1].

In order to improve audio performance, the following reference circuits are recommended. The audio signals

have to be layout according to differential signal layout rules as shown in following figures.

4.7.1. Speaker Interfaces Configuration

Figure 30: Speaker reference circuit

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Electret

Microphone

The lines in bold type should

be accorded to differential

signal layout rules

These components should

be placed to microphone

as close as possible

MIC1P/2P

Module

MIC1N/2N

ESD

10pF

33pF

10pF

Working current

2.0

mA

Input impedance(differential)

13

20

27

KΩ

Idle channel noise

-67

dBm0

Parameter

Conditions

Min

Typ

Max

Unit

RL=32 Ω receiver

-

90 - mW

SIMCOM CONFIDENTIAL FILE

4.7.2. Microphone Interfaces Configuration

Figure 31: Speaker with amplifier reference circuit

4.7.3. Audio Electronic Characteristic

Table 15: Microphone input characteristics

Parameter Min Typ Max Unit

Microphone biasing voltage 1.9 2.2 V

Input level:-40dBm0 29 dB

SINAD

Input level:0dBm0 69 dB

Table 16: Audio output characteristics

Normal output

RL=8 Ω speaker - - 1080 mW

4.7.4. TDD

Audio signal could be interferenced by RF signal. Coupling noise could be filtered by adding 33pF and 10pF

capacitor to audio lines. 33pF capacitor could eliminate noise from GSM850/EGSM900MHz, while 10pF

capacitor could eliminate noise from DCS1800/PCS1900Mhz frequency. Customer should develop this filter

solution according to field test result.

GSM antenna is the key coupling interfering source of TDD noise. Thereat, pay attention to the layout of audio

lines which should be far away from RF cable, antenna and VBAT pin. The bypass capacitor for filtering should

be placed near module and another group needs to be placed near to connector.

Conducting noise is mainly caused by the VBAT drop. If audio PA was powered by VBAT directly, then there

SIM800H _Hardware Design_V2.03 35 2016-10-10

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SIM_DET

54

SIM card detection

Module

PRESENCE

100nF

MOLEX-91228

SIM

Card

22pF

VCC

GND

RST

VPP

CLK I/O

GND

VDD_EXT

SIM_VDD SIM_RST SIM_CLK

SIM_DATA

4.7K

ESDA6V1

SIM_DET

51Ω

SIMCOM CONFIDENTIAL FILE

will be some cheep noise from speaker output easily. So it is better to put big capacitors and ferrite beads near

audio PA input.

TDD noise has something to do with GND signal. If GND plane is not good, lots of high-frequency noises will

interference microphone and speaker over bypass capacitor. So a good GND during PCB layout could avoid

TDD noise.

4.8. SIM Card Interface

The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2+ specification for

FAST 64 kbps SIM card. Both 1.8V and 3.0V SIM card are supported. The SIM interface is powered from an

internal regulator in the module.

4.8.1. SIM Card Application

Table 17: SIM pin definition

Pin name Pin number Function

SIM_VDD 16 Voltage supply for SIM card. Support 1.8V or 3V SIM card

SI M_ D ATA 14 SIM data input/output

SIM_CLK 55 SIM clock

SIM_RST 15 SIM reset

It is recommended to use an ESD protection component such as ST (

SEMI (

www.onsemi.com ) SMF05C. That the SIM peripheral circuit should be close to the SIM card socket.

www.st.com ) ESDA6V1-5W6 or ON

The reference circuit of the 8-pin SIM card holder is illustrated in the following figure.

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

The SIM_DET pin is used for detection of the SIM card hot plug in. Customer can select the 8-pin SIM card

holder to implement SIM card detection function. AT command “AT+CSDT” is used to enable or disable SIM

card detection function. For details of this AT command, please refer to document [1].

If the SIM card detection function is not used, customer can keep the SIM_DET pin open. The reference circuit

of 6-pin SIM card holder is illustrated in the following figure.

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Module

SIM Card

VCC

GND

RST

VPP

CLK

I/O

C707 10M 006 512 2

22pF

100nF

SIM_VDD SIM_RST SIM_CLK

SIM_DATA

SIM_DET

ESDA6V1

51Ω

SIMCOM CONFIDENTIAL FILE

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

4.8.2. SIM Card Design Guide

SIM card signal could be interferenced by some high frequency signal, it is strongly recommended to follow

these guidelines while designing:

 SIM card holder should be far away from GSM antenna

 SIM traces should keep away from RF lines, VBAT and high-speed signal lines

 The traces should be as short as possible

 Keep SIM card holder’s GND connect to main ground directly

 Shielding the SIM card signal by ground well

 Recommended to place a 100nF capacitor on SIM_VDD line and keep close to the SIM card holder

 Add some TVS which parasitic capacitance should not exceed 50pF

 Add 51Ω resistor to (SIM_RST/SIM_CLK/SIM_DATA) signal could enhance ESD protection

4.8.3. Design Considerations for SIM Card Holder

For 8 pins SIM card holder, SIMCom recommends to use Molex 91228.Customer can visit

http://www.molex.com for more information about the holder.

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C5

GND

Connect to GND

SIMCOM CONFIDENTIAL FILE

Figure 34: Molex 91228 SIM card holder

Table 18: Pin description (Molex SIM card holder)

Pin name Signal Description

C1 SIM_VDD SIM card power supply

C2 SIM_RST SIM card reset

C3 SIM_CLK SIM card clock

C4 GND Connect to GND

C6 VPP Not connect

C7 SIM _D ATA SIM card data I/O

C8 SIM_DET Detect SIM card presence

For 6-pin SIM card holder, SIMCom recommends to use Amphenol C707 10M006 512 .Customer can visit

http://www.amphenol.com for more information about the holder.

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C1

SIM_VDD

SIM card power supply

C3

SIM_CLK

SIM card clock

SIMCOM CONFIDENTIAL FILE

Figure 35: Amphenol C707 10M006 512 SIM card holder

Table 19: Pin description (Amphenol SIM card holder)

Pin name Signal Description

C2 SIM_RST SIM card reset

C5 GND Connect to GND

C6 VPP Not connect

C7 SI M_ D ATA SIM card data I/O

Note: Every time plug SIM card interval advice is greater than 2s. Otherwise may not be able to correct detection.

4.9. PCM Interface

SIM800H provides a hardware PCM interface:

Table 20: PCM pin definition

Pin name Pin number Description

PCM_CLK 29 PCM clock

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Module

CODEC

PCMIN

PCMSYNC

PCMOUT

PCMCLK

GND

PCM_IN

PCM_OUT

PCM_SYNC

PCM_CLK

Data length

16bits(Fixed)

PCM Clock Rate

256kHz(Fixed)

SIMCOM CONFIDENTIAL FILE

PCM_OUT 30 PCM data output

PCM_SYNC 65 PCM synchrony

PCM_IN 66 PCM data input

SIM800H PCM interface only supply master mode, data length is 16 bits (linear)，PCM clock rate is 256kHz.

Table 21: PCM specification

Parameter Specification

Line Interface Format Linear(Fixed)

PCM Clock/Sync Source Master Mode(Fixed)

PCM Sync Format Short sync/Long sync both support

Zero Padding/Sign extension Zero Padding(Fixed)

Data Ordering MSB/LSB both support

Note: Customer can use AT command control PCM interface. For detail, please refer to document [1].

4.9.1. PCM reference circuit

Refer to the following figure for PCM design:

Figure 36: PCM reference circuit

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KBR4

KBR3

KBR2

KBR1

KBR0

KBC0 KBC1 KBC2 KBC3 KBC4

Module

KBR4

KBR0

KBC0

KBC4

20K

Module

20K

SIMCOM CONFIDENTIAL FILE

4.10. Keypad Interface

The keypad interface consists of 5 keypad column outputs and 5 keypad row inputs. with total 5*5*2, which is 50

keys. Module has two connections, which supports 25 keys and anther supports 50 keys.

Figure 37: 25 keys reference circuit

Note：According to the traditional 5*5 to design buttons, when there is spare KBC or KBR, customer can execute AT command

to define as GPIO for details please see the relevant manuals.

Module supports a new key connection, can support 50 keys, which meets full keyboard demand, the connection

diagram is as following:

Figure 38: 50 keys reference circuit

Note：Do not change the 20KΩ resistor in the diagram.

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KBRx

KBCx

20K

<1K

Module

KBRx

KBCx

20K

Module

KBC1

25

Pull up

KBC2

22

Pull up

KBC3

21

Pull up

KBR2

61

Pull down

KBR3

23

Pull down

SIMCOM CONFIDENTIAL FILE

Customer could cascade a less than 1K resistor to enhance the ESD performance, the connection diagram is as

following:

Figure 39: Keypad reference circuit

Whether using a 5*5 keys or 5*5*2 keys, the module can also detect the two buttons pressed. But when using a

5*5*2 button, the same row, column two buttons pressed at the same time can’t be detected, as shown below:

Figure 40: Keypad detected

Table 22: Pin definition of the keypad interface

Pin name Pin number Function Default state

KBC0 20

Keypad matrix column

KBC4 24 Pull up

KBR0 62

KBR1 60 Pull down

Keypad matrix row

KBR4 63 Pull down

Note: Please be sure to increase the ESD protection devices in product design phase, and make sure have ESD protection devices

in the final product.

Pull up

Pull down

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Pin name

Pin number

Reset state

3

Refer to Figure 41

27

Refer to Figure 41

28

Refer to Figure 41

0.29s

PWRKEY

(INPUT)

GPIO1

GPIO2

t<1.9s

0.8s

GPIO3

t<=10us

SIMCOM CONFIDENTIAL FILE

4.11. I2C Bus

The SIM800H provides an I2C interface which is only used in the embedded AT application.

 The highest data rate is 400kbit/s

 Automatic start and stop bits

 Generated response and confirmation automatically

 Application hardware I2C protocol

Table 23: Pin definition of the I2C

Pin name Pin number Description

SCL 74 I2C serial bus clock

SDA 75 I2C serial bus data

Notes:

1. This function is not supported in the standard firmware. If customer wants this function, the firmware must be customized.

Please contact SIMCom for more details.

2. If customers design I2C please pull up to VDD_EXT.

4.12. General Purpose Input/Output (GPIO)

SIM800H provides 3 GPIO pins. The output voltage level of the GPIO can be set by AT command “AT +S GPIO”.

The input voltage level of the GPIO can also be read by AT command “AT+ SG P IO ”. For more details, please refer

to document [1].

Table 24: Pin definition of the GPIO

GPIO1

GPIO2

GPIO3

Figure 41: GPIO timing sequences

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Parameter

Min

Typ

Max

Unit

Voltage range

0 - 2.8

V

4.7K

47K

VBAT

Module

PWM

SIMCOM CONFIDENTIAL FILE

4.13. ADC

Table 25: Pin definition of the ADC

Pin name Pin number Description

ADC 50 Analog voltage input

SIM800H provides an auxiliary ADC, which can be used to measure the voltage. Customer can use AT command

“AT+CADC” to read the voltage value. For details of this AT command, please refer to document [1].

Table 26: ADC specification

ADC Resolution - 10 - bits

Sampling rate - - 1.0833 MHz

ADC precision 10 30 mV

4.14. PWM

Table 27: Pin definition of the PWM

Pin name Pin number Description

PWM 26 PWM signal

SIM800H provides a PWM which can be used to drive a vibrator, and a backlight LED for display or keyboard.

PWM output frequency varies from 0~2kHz. Two 7-bit unsigned binary parameters are used for the output period

and for the duty cycle. AT command “AT + SPWM” is used to set the output period and duty cycle of the PWM.

For details, please refer to document [1].

A typical recommended circuit of the PWM driver buzzer is shown in the following figure.

SIM800H _Hardware Design_V2.03 44 2016-10-10

Figure 42: Reference circuit of PWM driver buzzer

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Parameter

Min

Typ

Max

Unit

Working voltage

2.5

2.8

2.9

V

Status

SIM800H behavior

Off

SIM800H is not running

64ms On/ 800ms Off

SIM800H not registered the network

64ms On/ 3000ms Off

SIM800H registered to the network

64ms On/ 300ms Off

GPRS communication is established

Module

NETLIGHT

VBAT

4.7K

47K

R

Network Status Indication

SIMCOM CONFIDENTIAL FILE

Table 28: Buzzer characteristics

Working current 16 mA

Note: PWM pin must be kept at low power level when module is in the power on procedure.

4.15. Network Status Indication

Table 29: Pin definition of the NETLIGHT

Pin name Pin number Description

NETLIGHT 64

The NETLIGHT pin can be used to drive a network status indication LED. The status of this pin is listed in

following table:

Table 30: Status of the NETLIGHT pin

Reference circuit is recommended in the following figure:

Figure 43: Reference circuit of NETLIGHT

4.16. Operating Status Indication

The pin4 is for operating status indication of the module. The pin output is high when module is powered on,

and output is low when module is powered down.

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Pin name

Pin number

Description

STAT U S

4

Operating status indication

Module

ISINK0

VBAT VBAT

R

ISINK1

Pin name

Pin number

Description

ISINK0

47

Sink current for LCM module

Pin name

Pin number

Description

SIMCOM CONFIDENTIAL FILE

Table 31: Pin definition of the STATUS

Note: For timing about STATUS, please reference to the chapter “4.2 power on/down scenarios”

4.17. LED Interface

SIM800H provides two LED driver pin. The two pin are open-drain output.

Table 32: Pin definition of the LED

ISINK1 46 Sink current for keypad LED

Reference circuit is recommended in the following figure:

Figure 44: LED driver reference circuit

Table 33: ISINK specification

Pin name Min Typ Max Unit

ISINK0 - 24 mA

ISINK1 60 - 100 mA

Note: Isink0 provide 6-current-level steps of up to 24mA.

4.18. RF Synchronization Signal

The synchronization signal serves to indicate growing power consumption during the transmit burst. The signal

is generated by the RF_SYNC pin.

Table 34: Definition of the RF_SYNC pin

RF_SYNC 5 Transmit synchronization signal

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Transmit burst

RF_SYNC

577us

220us

GND

(Pin41)

R101

GSM_ ANT

C101

C102

GND

(Pin39)

GSM

Antenna

Module

RF connector

D101

SIMCOM CONFIDENTIAL FILE

The timing of the synchronization signal is shown below. High level of the RF_SYNC pin indicates increased

power consumption during transmission.

Figure 45: RF_SYNC signal during transmit burst

4.19. Antenna Interface

There are three antenna ports for SIM800H, GSM antenna port named GSM_ANT, Bluetooth antenna port

named BT_ANT and FM antenna port named FM_ANTP/FM_ANTN, The RF interface of the three antenna

ports has an impedance of 50Ω.

 The input impendence of the antenna should be 50Ω, and the VSWR should be less than 2.

 It is recommended that the GSM antenna and the BT antenna should be placed as far as possible.

 The isolations of the three antenna should be bigger than 30dB

NOTE：About the RF trace layout please refer to“AN_SMT Module_RF_Reference Design_Guide”.

4.19.1. GSM Antenna Interface

There is a GSM antenna pad named GSM_ANT for SIM800H, the connection of the antenna must be decoupled

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:

SIM800H _Hardware Design_V2.03 47 2016-10-10

Figure 46: GSM antenna matching circuit

Smart Machine Smart Decision

R101

GSM_ANT

C101

C102

GND

(Pin41)

GND

(Pin39)

GSM

Antenna

Module

D101

Vendor

Part number

Packages

1

Marata

LXES03AAA1-154

0201

R201

BT_ANT

(Pin36)

C201

C202

GND

(Pin37)

GND

(Pin35)

BT

Antenna

Module

SIMCOM CONFIDENTIAL FILE

R101，C101，C102 are the matching circuit, the value should be defined by the antenna design. Normally R101 is

0Ω, C101 and C102 are not mounted. The RF connector is used for conduction test. If the space between RF pin

and antenna is not enough, the matching circuit should be designed as in the following figure:

Figure 47: GSM simple antenna matching circuit

Normally R101 is 0Ω, C101 and C102 are not mounted.

D101 in Figure 46 and Figure 47 is used for ESD to protect antenna. In order to avoid damaging the module,

TVS can be used. The TVS suggested can refer to Table 35.

Table 35: Recommended transient voltage suppressor

2 Marata LXES15AAA1-153 0402

4.19.2. Bluetooth Antenna Interface

The SIM800H module provides a Bluetooth antenna pad named BT_ANT.

The external antenna must be matched properly to achieve best performance, so the matching circuit is necessary,

the connection is recommended as in the following figure:

SIM800H _Hardware Design_V2.03 48 2016-10-10

Figure 48: Bluetooth antenna matching circuit

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Moudle

FM_ANTP

R303

C303

C304

R304

R301

C301

C302

R302

FM

Antenna

FM_ANTN

Moudle

GND

L301

R301

R303

C303

C304

C301

C302

FM_ANTP

FM_ANTN

SIMCOM CONFIDENTIAL FILE

R201, C201, C202 are the matching circuit, the value should be defined by the antenna design. Normally R201 is

1.2nH, C202 is 1.5pF and C201 are not mounted.

There are some suggestions for placing components and RF trace lying for GSM and Bluetooth RF traces:

 The RF connector is used for conducted test, so keep it as close to pin GSM_ANT as possible;

 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.

4.19.3. FM Antenna Interface

The module provides 2 FM antenna pad named FM_ANTP and FM_ANTN, these are difference signal. The FM

antenna interface circuit is recommended as following:

Figure 49: FM antenna matching circuit

Normally, R301\R302\R303\R304 are 0Ω, C301\C302\C303\C304 are not mounted.

The earphone is often used for FM antenna, as an example, the pin GND of the 3.5mm earphone is connected to

the FM interface. The circuit is recommended as following:

Normally, R301\R303 are 0Ω, C301\C302\C303\C304\L301 are not mounted.

Figure 50: GND pin of the earphone use to be the FM antenna interface

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GND

USB_DP

GND

GNDGND

GND

GNDGND

GND

VBAT

VBUS

Audio

SIM

FM

antenna

USB

KEY

PCM

UART

GSM

Antenna

I2C

BT Antenna

GND

GNDGND

GND

GND GND

GND

SIMCOM CONFIDENTIAL FILE

5. PCB Layout

Usually, most electronic products with good performance are based on good PCB layout. A bad PCB layout will

lead to lots of issues, like TDD noise, SIM card not be detected, etc. the final solution for these problems is to

redo PCB layout. Making good PCB layout at beginning will save develop schedule and cost as well.

This section will give some guidelines on PCB layout, in order to eliminate interfere or noise by greatest degree,

and save product development period.

5.1 Pin Assignment

Before PCB layout, we should learn well about pin assignment in order to get reasonable layout with so many

external components. Following figure is the overview of pin assignment of the module.

Figure 51: Pin assignment

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SIMCOM CONFIDENTIAL FILE

5.2 Principle of PCB Layout

During layout, attention should be paid to the following interfaces, like Antenna, power supply, SIM card

interface, audio interface, and so on.

5.2.1 Antenna Interface

 The length of trace between pin output and connector should be as short as possible;

 Do not trace RF signal over across the board;

 The RF signal should be far away from SIM card, power ICs.

5.2.2. Power Supply

 Not only VBAT but also return GND are very important in layout;

 The positive line of VBAT should be as short and wide as possible;

 The correct flow from source to VBAT pin should go though Zener diode then huge capacitor;

 Pin 2, Pin 43, Pin 44 and Pin45 are GND signals, and shortest layout to GND of power source

should be designed;

 There are 12 GND pads in middle of module; these pads could enhance the GND performances. On

the upper layer of these pads, do not trace any signal if possible.

5.2.3 SIM Card Interface

 SIM card holder has no anti-EMI component inside. Thus SIM card interface maybe interfered,

please pay more attention on this interface during layout;

 Ensure SIM card holder is far way from antenna or RF cable inside;

 Put SIM card holder near the module, as nearer as possible;

 Add ESD component to protect SIM_CLK, SIM_DATA, SIM_RST and SIM_VDD signals which

should be far away from power and high-speed-frequency signal.

5.2.4 Audio Interface

 The signal trace of audio should far away from antenna and power;

 The audio signal should avoid to parallel with VBAT trace.

5.2.5 Others

It is better to trace signal lines of UART bunched, as well as signals of USB.

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SIMCOM CONFIDENTIAL FILE

5.3 Recommended PCB Layout

Based on above principles, recommended layout is shown in the following illustration.

Figure 52: Recommended PCB layout

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Current

0 - 2.0 A VBUS

- - 12 V II* - 4

16

mA

VBAT

Power supply voltage

3.4

4.0

4.4 V VBUS

USB operating voltage

4.3

5.0 7 V

OPER

T

STG

Storage temperature

-45 +90 ℃

VIH

High-level input voltage

2.1 - 3.1 V VIL

Low-level input voltage

-0.3 - 0.7 V VOH

High-level output voltage

2.4

2.8 - V

SIMCOM CONFIDENTIAL FILE

6. Electrical, Reliability and Radio Characteristics

6.1 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 SIM800H.

Table 36: Absolute maximum ratings

Symbol Min Typ Max Unit

VB AT - - 4.5 V

IO* - 4 16 mA

*

These parameters are for digital interface pins, such as keypad, GPIO, I2C, UART, and PCM.

6.2 Recommended Operating Conditions

Table 37: Recommended operating conditions

Symbol Parameter Min Typ Max Unit

T

Operating temperature -40 +25 +85 ℃

6.3 Digital Interface Characteristics

Table 38: Digital interface characteristics

Symbol Parameter Min Typ Max Unit

VOL Low-level output voltage - - 0.4 V

Note: These parameters are for digital interface pins, such as keypad, GPIO, I2C, UART, and PCM.

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Symbol

Parameter

Min

Typ

Max

Unit

2.4 - -

V

- - 0.27

V

1.62

- - V

Symbol

Parameter

Min

Typ

Max

Unit

-

3.0

-

IO

Output current

- - 10

mA

V

RTC-IN

VRTC input voltage

1.2

2.8

3.0 V I

RTC-IN

VRTC input current

-

3.0

5.0

uA

V

RTC-OUT

VRTC output voltage

-

2.8 - V

RTC-OUT

SIMCOM CONFIDENTIAL FILE

6.4 SIM Card Interface Characteristics

Table 39: SIM card interface characteristics

IIH High-level input current -1.0 - 1.0 uA

IIL Low-level input current -1.0 - 1.0 uA

VIH High-level input voltage

VIL Low-level input voltage

VOH High-level output voltage

VOL Low-level output voltage

6.5 SIM_VDD Characteristics

Table 40: SIM_VDD characteristics

VO Output voltage

6.6 VDD_EXT Characteristics

1.4 - - V

0.4 V

2.7 - - V

- - 0.36 V

- - 0.4 V

V

- 1.8 -

Table 41: VDD_EXT characteristics

Symbol Parameter Min Typ Max Unit

VO Output voltage 2.7 2.8 2.9 V

IO Output current - - 50 mA

6.7 VRTC Characteristics

Table 42: VRTC characteristics

Symbol Description Min Typ Max Unit

I

VRTC output current - 2.0 mA

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Symbol

Parameter

Conditions

Min

Typ

Max

Unit

0

( BS-PA-MFRMS=2)

1.57

mA

SIMCOM CONFIDENTIAL FILE

6.8 Current Consumption (VBAT=3.8V)

Table 43: Current consumption

VBAT Voltage 3.4 4.0 4.4 V

Power drop PCL=5 350 mV

PCL=5

Voltage ripple

IVBAT Average current Power down mode 150 200 uA

@ f<200kHz

@ f>200kHz

Sleep mode (AT+CFUN=1)：

( BS-PA-MFRMS=9 )

( BS-PA-MFRMS=5)

Idle mode (AT+CFUN=1)：

EGSM900

Voice call (PCL=5)：

GSM850

EGSM900

DCS1800

PCS1900

Data mode(1Rx,4Tx)：

GSM850

EGSM900

DCS1800

PCS1900

1.04

1.14

17.38

221.11

238.44

157.48

159.22

491.79

529.84

333.16

336.28

5

2.0

mV

mA

Data mode (3Rx,2Tx)：

GSM850

IMAX Peak current During Tx burst

Note: In above table the current consumption value is the typical one of the module tested in laboratory. In the mass production

stage, there may be differences among each individual.

EGSM900

DCS1800

PCS1900

Data mode (4Rx,1Tx,)：

GSM850

EGSM900

DCS1800

PCS1900

359.75

385.73

250.54

251.30

233.87

249.85

174.13

174.94

mA

2.0 A

mA

SIM800H _Hardware Design_V2.03 55 2016-10-10

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Terms

Contents

Bluetooth specification

Ver sion3.0

Time division multiplex either transmit or receive Frequency

3. -20dB bandwidth

-

0.8 1 MHz

5.1 [M-N] = 2

-46

-20

dBm

6.3 Modulation δf2avg/δf1avg

0.8

0.88

8. Out-of-Band Spurious Emissions

8.1 30-1000MHz (Operation Mode)

-58

-36

dBm

8.3 1800-1900MHz(Operation Mode)

-80

-47

dBm

(Pi/4-DQPSK and 8DPSK)

10.2 ω0 (Pi/4-DQPSK and 8DPSK)

-10

0

10

kHz

10.3 ωi+ω0 (Pi/4-DQPSK and 8DPSK)

-75

0

75

kHz

SIMCOM CONFIDENTIAL FILE

Table 44: Bluetooth characteristics

Channel spacing 1MHz

Number of RF channel 79

Power class 1.5

Operation mode (Rx/Tx)

hopping after one Rx/Tx cycle

Items Min Typ Max Unit

1. Output Power 5.5 7.5 10 dBm

2. Frequency range (Rx/Tx) 2402 - 2480 MHz

4. Adjacent Channel Power

5.2 [M-N] > 2 -51 -40 dBm

6. Modulation characteristics

6.1 Modulation δf1avg 140 165 175 kHz

6.2 Modulation δf2max 115 130 kHz

7. Carrier Frequency Drift

7.1 1slot -25 +25 kHz

7.2 3slot -40 +40 kHz

7.3 5slot -40 +40 kHz

7.4 Maximum drift rate -20 +20 kHz/50us

8.2 1000-12750MHz (Operation Mode) -40 -30 dBm

8.4 5150-5300MHz (Operation Mode) -80 -47 dBm

9. EDR Relative Power

-4 -0.2 1

10. EDR Carrier Frequency Stability and

Modulation Accuracy

10.1 ωi (Pi/4-DQPSK and 8DPSK) -75 0 75 kHz

10.4 RMS DEVM (Pi/4-DQPSK) 6 20 %

10.5 99% DEVM (Pi/4-DQPSK) 10 30 %

10.6 Peak DEVM (Pi/4-DQPSK) 14 35 %

10.7 RMS DEVM (8DPSK) 6 13 %

SIM800H _Hardware Design_V2.03 56 2016-10-10

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Conditions

Min

Typ

Max

Unit

Search

16.4

38.3

107.6

mA

Connect

17.5

24.1

74.8

mA

11.2 2441MHz

-92

-70

dBm

12.3 2MHz ratio (-60dBm input)

-38

-30

dB

12.4 3MHz ratio (-67dBm input)

-45

-40

dB

13.3 2500MHz-3000MHz

-28 0

dBm

13.4 3000MHz-12750MHz

-10

-5 dBm

16.1 Pi/4-DQPSK

-94

-70

dBm

SIMCOM CONFIDENTIAL FILE

10.8 99% DEVM (8DPSK) 10 20 %

10.9 Peak DEVM (8DPSK) 16 25 %

RX characteristics

11. Sensitivity (BER < 0.1%)

11.1 2402MHz -92 -70 dBm

11.3 2480MHz -92 -70 dBm

12. C/I Performance (BER < 0.1%)

12.1 co-channel ratio (-60dBm input) 8 11 dB

12.2 1MHz ratio (-60dBm input) -10 0 dB

12.5 image +/- 1MHz ratio (-67dBm input) -30 -20 dB

13. Blocking performance (BER < 0.1%)

13.1 30MHz-2000MHz -10 -8 dBm

13.2 2000MHz-2400MHz -28 0 dBm

14. Intermodulation performance

(BER < 0.1%, -64dBm input)

15. Maximum Input Level -20 -5 dBm

16. EDR Sensitivity (at 0.01% BER)

16.2 8DPSK -87 -70 dBm

Table 45: Current consumption of Bluetooth

Matches 13.3 17.1 58.4 mA

SIM800H _Hardware Design_V2.03 57 2016-10-10

-39 -30 dBm

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SPK_P/SPK_N/MIC_P/MIC_N

±2KV

±5KV

GSM850,EGSM900

7

29

±3

±4

9

25

±3

±4

14

15

±3

±4

16

11

±5

±6

SIMCOM CONFIDENTIAL FILE

6.9 Electro-Static Discharge

SIM800H is an ESD sensitive component, so attention should be paid to the procedure of handling and

packaging. The ESD test results are shown in the following table.

Table 46: The ESD characteristics (Temperature: 25 ℃, H um idity: 45 % )

Pin name Contact discharge Air discharge

VB AT ±6KV ±12KV

GND ±6KV ±12KV

RXD, TXD ±2KV ±8KV

Antenna port ±5KV ±10KV

PWRKEY ±2KV ±8KV

6.10 Radio Characteristics

6.10.1. 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.

Table 47: GSM850 and EGSM900 conducted RF output power

PCL Nominal output power (dBm)

5 33 ±2 ±2.5

6 31 ±3 ±4

8 27 ±3 ±4

10 23 ±3 ±4

11 21 ±3 ±4

12 19 ±3 ±4

Tolerance (dB) for conditions

Normal Extreme

13 17 ±3 ±4

15 13 ±3 ±4

17 9 ±5 ±6

18 7 ±5 ±6

19-31 5 ±5 ±6

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DCS1800,PCS1900

Tolerance (dB) for conditions

Normal

Extreme

0

30

±2

±2.5

6

18

±3

±4

11 8 ±4

±5

12 6 ±4

±5

Frequency

Receive sensitivity（Typical）

Receive sensitivity(Max)

GSM850,EGSM900

< -108dBm

< -106dBm

1930 ～ 1990MHz

1850 ～ 1910MHz

SIMCOM CONFIDENTIAL FILE

Table 48: DCS1800 and PCS1900 conducted RF output power

PCL Nominal output power (dBm)

1 28 ±3 ±4

2 26 ±3 ±4

3 24 ±3 ±4

4 22 ±3 ±4

5 20 ±3 ±4

7 16 ±3 ±4

8 14 ±3 ±4

9 12 ±4 ±5

10 10 ±4 ±5

13 4 ±4 ±5

14 2 ±5 ±6

15 0 ±5 ±6

6.10.2. Module RF Receive Sensitivity

The following table shows the module’s conducted receiving sensitivity, it is tested under static condition.

Table 49: Conducted RF receive sensitivity

DCS1800,PCS1900 < -108dBm < -106dBm

6.10.3. Module Operating Frequencies

The following table shows the module’s operating frequency range; it is followed by the 3GPP TS 05.05

technical specification requirement.

Table 50: Operating frequencies

Frequency Receive Transmit

GSM850

EGSM900

DCS1800

PCS1900

SIM800H _Hardware Design_V2.03 59 2016-10-10

869 ～ 894MHz 824 ～ 849MHz

925 ～ 960MHz 880 ～ 915MHz

1805 ～ 1880MHz 1710 ～ 1785MHz

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SIMCOM CONFIDENTIAL FILE

7. Manufacturing

7.1. Top and Bottom View of SIM800H

Figure 53: Top and bottom view of SIM800H

7.2. Typical Solder Reflow Profile

Figure 54: Typical solder reflow profile of lead-free processes

SIM800H _Hardware Design_V2.03 60 2016-10-10

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Moisture Sensitivity Level

3

168 hours

4

72 hours

5a

24 hours

Mandatory bake before use. After bake, it must be reflowed within the time limit

SIMCOM CONFIDENTIAL FILE

7.3. The Moisture Sensitivity Level

The moisture sensitivity level of SIM800H module is 3. The modules should be mounted within 168 hours after unpacking in the environmental conditions of temperature <30 ℃

necessary to bake the module if the above conditions are not met:

Table 51: Moisture sensitivity level and floor life

Floor Life (out of bag) at factory ambient≤30°C/60% RH or as stated

(MSL)

1 Unlimited at ≦30℃/85% R H

2 1 year

2a 4 weeks

5 48 hours

a n d re la tiv

6

specified on the label.

Note: For product handling, storage, processing, IPC / JEDEC J-STD-033 must be followed.

7.4. Baking Requirements

SIM800H modules are vacuum packaged, and guaranteed for 6 months storage without opening or leakage under the following conditions: the environment temperature is lower than 40 ℃

If the condition meets one of the following ones shown below, the modules should be baked sufficiently before

re-flow soldering, and the baking condition is shown in below table; otherwise the module will be at the risk of

permanent damage during re-flow soldering.

 If the vacuum package is broken or leakage;



If the vacuum package is opened after 6 months since it’s been packed;



If the vacuum package is opened within 6 months but out of its Floor Life at factory ambient ≦30℃/60% R H or as stated

.

, and the air h

Table 52: Baking requirements

Baking temperature Moisture Time

40 ℃±5 ℃ <5% 192 hours

120 ℃±5 ℃ <5% 6 hours

Note: Care should be taken if that plastic tray is not heat-resistant, the modules should be taken out for preheating, otherwise the

tray may be damaged by high-temperature heating.

SIM800H _Hardware Design_V2.03 61 2016-10-10

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AT Command

SIM800 Series UART Port

[5]

GSM 07.10

Support GSM 07.10 multiplexing protocol

Digital cellular telecommunications (Phase 2+); Use of Data

DCE) interface for Short Message Service (SMS) and Cell

Digital cellular telecommunications system (Phase 2+);

Specification of the SIM Application Toolkit for the Subscriber

m (Phase 2+);

[12]

Module secondary-SMT-UGD

Module secondary SMT User Guide

Design_Guide

SIMCOM CONFIDENTIAL FILE

8. Appendix

I. Related Documents

Table 53: Related documents

SN Document name Remark

[1]

[2]

[3]

[4] GSM 07.07

[6] GSM 07.05

[7] GSM 11.14

[8] GSM 11.11

SIM800 Series

Manual

Application Note_V1 01.doc

ITU-T Draft new

recommendation V.25ter

Serial asynchronous automatic dialing and control

Digital cellular telecommunications (Phase 2+); AT command set for

GSM Mobile Equipment (ME)

Terminal Equipment – Data Circuit terminating Equipment (DTE –

Broadcast Service (CBS)

Identity Module – Mobile Equipment (SIM – ME) interface

Digital cellular telecommunications syste

Specification of the Subscriber Identity Module – Mobile

Equipment (SIM – ME) interface

[9] GSM 03.38

[10] GSM 11.10

[11] AN_Serial Port AN_Serial Port

AN_SMT

[13]

SIM800H _Hardware Design_V2.03 62 2016-10-10

Module_RF_Reference

Digital cellular telecommunications system (Phase 2+); Alphabets

and language-specific information

Digital cellular telecommunications system (Phase 2)； Mobile Station (MS) conformance specification； Part 1： Conformance

specification

Smart Machine Smart Decision

AMR

Adaptive Multi-Rate

CS

Coding Scheme

EFR

Enhanced Full Rate

EGSM

Enhanced GSM

ETS

European Telecommunication Standard

Li-ion

Lithium-Ion

PBCCH

Packet Broadcast Control Channel

PCB

Printed Circuit Board

PCL

Power Control Level

RMS

Root Mean Square (value)

RX

Receive Direction

URC

Unsolicited Result Code

SIMCOM CONFIDENTIAL FILE

II. Terms and Abbreviations

Table 54: Terms and abbreviations

Abbreviation Description

ADC Analog-to-Digital Converter

CTS Clear to Send

DTE Data Terminal Equipment (typically computer, terminal, printer)

DTR Data Terminal Ready

DTX Discontinuous Transmission

ESD Electrostatic Discharge

FR Full Rate

GPRS General Packet Radio Service

GSM Global Standard for Mobile Communications

HR Half Rate

IMEI International Mobile Equipment Identity

MO Mobile Originated

MS Mobile Station (GSM engine), also referred to as TE

MT Mobile Terminated

PAP Password Authentication Protocol

PCS Personal Communication System, also referred to as GSM 1900

PDU Protocol Data Unit

PPP Point-to-point protocol

RF Radio Frequency

RTC Real Time Clock

SIM Subscriber Identification Module

SMS Short Message Service

TE Terminal Equipment, also referred to as DTE

TX Transmit Direction

UART Universal Asynchronous Receiver & Transmitter

SIM800H _Hardware Design_V2.03 63 2016-10-10

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ON

SIM (or ME) own numbers (MSISDNs) list

SIMCOM CONFIDENTIAL FILE

USSD Unstructured Supplementary Service Data

Phonebook abbreviations

FD SIM fix dialing phonebook

LD SIM last dialing phonebook (list of numbers most recently dialed)

MC Mobile Equipment list of unanswered MT calls (missed calls)

RC Mobile Equipment list of received calls

SM SIM phonebook

NC Not connect

SIM800H _Hardware Design_V2.03 64 2016-10-10

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Marks

Requirements

When in a hospital or other health care facility, observe the restrictions about the use of mobiles.

Switch the cellular terminal or mobile off, medical equipment may be sensitive to not operate

normally for RF energy interference.

The operation of wireless appliances in an aircraft is forbidden to prevent interference with

communication systems. Forget to think much of these instructions may lead to the flight safety or

off the cellular terminal when you are near petrol stations, fuel depots, chemical plants or where

cal equipment in potentially explosive

ers or other electric

held cellular terminal or mobile when driving a

vehicle, unless it is securely mounted in a holder for hands free operation. Before making a call

GSM cellular terminals or mobiles operate over radio frequency signals and cellular networks and

cannot be guaranteed to connect in all conditions, for example no mobile fee or a invalid SIM card.

and need emergent help, please remember using emergency calls.

In order to make or receive calls, the cellular terminal or mobile must be switched on and in a

use (e.g. lock functions, fixed dialing etc.). You may have to deactivate those features before you

SIMCOM CONFIDENTIAL FILE

III. Safety Caution

Table 55: Safety caution

Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it is switched off.

offend against local legal action, or both.

Do not operate the cellular terminal or mobile in the presence of flammable gases or fumes. Switch

blasting operations are in progress. Operation of any electri

atmospheres can constitute a safety hazard.

Your cellular terminal or mobile receives and transmits radio frequency energy while switched on.

RF interference can occur if it is used close to TV sets, radios, comput

equipment.

Road safety comes first! Do not use a hand-

with a hand-held terminal or mobile, park the vehicle.

While you are in this condition

service area with adequate cellular signal strength.

Some networks do not allow for emergency call if certain network services or phone features are in

can make an emergency call.

Also, some networks require that a valid SIM card be properly inserted in the cellular terminal or

mobile.

SIM800H _Hardware Design_V2.03 65 2016-10-10

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SIMCOM CONFIDENTIAL FILE

Contact us: Shanghai SIMCom Wireless Solutions Co.,Ltd.

Address: Building A, SIM Technology Building, No. 633, Jinzhong Road, Shanghai, P. R. China 200335 Tel: 86-21-32523300 Fax: 86-21-32523020 Email: simcom@sim.com Website: www.simcomm2m.com

SIM800H _Hardware Design_V2.03 66 2016-10-10

SIM Tech SIMCom SIM800H Hardware Design

Specifications and Main Features

Frequently Asked Questions

User Manual

Table Index

Figure Index

Version History

SIM800H

4.5.1 Function of Serial Port

Serial Interfaces

4.5.3 Debug Interface

4.5.4 Software Upgrade

Network Status Indication

5.2.1 Antenna Interface

5.2.3 SIM Card Interface

5.2.4 Audio Interface

5.2.5 Others

III. Safety Caution