Quectel M20, Hardware Design

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M20 Hardware Design
Table Index
TABLE 1: RELATED DOCUMENTS.....................................................................................................9
TABLE 2: TERMS AND ABBREVIATIONS .......................................................................................10
TABLE 3: MODULE KEY FEATURES................................................................................................14
TABLE 4: CODING SCHEMES AND MAXIMUM NET DATA RATES OVER AIR INTERFACE..16
TABLE 5: PIN DESCRIPTION .............................................................................................................18
TABLE 6: OVERVIEW OF OPERATING MODES..............................................................................22
TABLE 7: RECOMMENDED BYPASS CAPACITORS FOR LIMITED CURRENT SUPPLY..........25
TABLE 8: AT COMMANDS USED IN ALARM MODE .....................................................................29
TABLE 9: RECOMMENDED BATTERY PROTECT CIRCUIT PARAMETER.................................35
TABLE 10: SPECIFICATION OF THE RECOMMENDED BATTERY PACK...................................35
TABLE 11: OPERATING MODES........................................................................................................39
TABLE 12: AT COMMANDS AVAILABLE IN THE GHOST MODE ................................................39
TABLE 13: SUMMARY OF STATE TRANSITION.............................................................................41
TABLE 14: LOGIC LEVELS OF SERIAL PORT.................................................................................45
TABLE 15: PIN DEFINITION OF SERIAL INTERFACE ...................................................................45
TABLE 16: PIN DEFINITION OF AUDIO INTERFACE ....................................................................48
TABLE 17: TYPICAL ELECTRET MICROPHONE INPUT CHARACTERISTIC ............................53
TABLE 18: TYPICAL SPEAKER OUTPUT CHARACTERISTIC......................................................54
TABLE 19: PIN DEFINITION OF THE DAI INTERFACE .................................................................54
TABLE 20: PIN DEFINITION OF THE SIM INTERFACE .................................................................55
TABLE 21: PIN DESCRIPTION (AMPHENOL SIM CARD HOLDER) ............................................58
TABLE 22: PIN DESCRIPTION (MOLEX SIM CARD HOLDER) ....................................................58
TABLE 23: PIN DEFINITION OF THE ADC.......................................................................................59
TABLE 24: CHARACTERISTICS OF THE ADC ................................................................................59
TABLE 25: BEHAVIOURS OF THE RI0..............................................................................................59
TABLE 26: WORKING STATE OF NETLIGHT..................................................................................61
TABLE 27: PRODUCT SPECIFICATIONS OF U.FL-R-SMT.............................................................63
TABLE 28: THE MODULE CONDUCTED RF OUTPUT POWER....................................................64
TABLE 29: THE MODULE CONDUCTED RF RECEIVING SENSITIVITY....................................64
TABLE 30: THE MODULE OPERATING FREQUENCY...................................................................64
TABLE 31: PIN ASSIGNMENT............................................................................................................65
TABLE 32: ABSOLUTE MAXIMUM RATINGS.................................................................................66
TABLE 33: OPERATING TEMPERATURE.........................................................................................66
TABLE 34: THE MODULE POWER SUPPLY RATINGS...................................................................66
TABLE 35: THE MODULE CURRENT CONSUMPTION..................................................................68
TABLE 36: THE ESD ENDURANCE (TEMPERATURE: 25
℃
, HUMIDITY: 45 %).........................70
TABLE 37: ORDERING INFORMATION ...........................................................................................71
TABLE 38: ORDERING INFORMATION DF12 SERIES ...................................................................74
TABLE 39: DIMENSIONS OF DF12 CONNECTOR...........................................................................75
TABLE 40: DESCRIPTION OF DIFFERENT CODING SCHEME.....................................................79
M20_HD_V1.01 - 4 -
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