User Manual
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V
Contents
1
GENERAL DESCRIPTION OF MODULE
............................................................................... 1
1.1
INTRODUCTION OF MODULE’S FUNCTIONS......................................................................
1
1.2
MODULE’S APPLICATION BLOCK DIAGRAM......................................................................
2
1.3
ABBREVIATIONS...................................................................... ....................................................
3
2
DESCRIPTIONS OF MODULE’S EXTERNAL INTERFACES
.................................................. 6
2.1
DEFINITIONS OF MODULE’S INTERFACES
......................................................6
2.2
ANTENNA INTERFACE
...................................................................................8
2.3
ANTENNA INTERFACE’S RF PERFORMANCE
................................................11
3
MODULE’S ELECTRICAL CHARACTERISTICS
.................................................................. 12
3.1
DESCRIPTIONS OF LEVELS OF INTERFACE SIGNALS
.....................................12
3.1.1
RESET
.................................................................................................12
3.1.2
UART
......................................................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.,,,,,12
3.1.3
I2C
......................................................................................................12
3.1.4
SPI
......................................................................................................13
3.1.5
PCM
....................................................................................................13
3.1.6
USB
....................................................................................................14
3.1.7
ADC
....................................................................................................14
3.1.8
PWM
..................................................................................................14
3.1.9
LCD
....................................................................................................14
3.1.10
GPS/GLONASS/BEIDOU
......................................................................15
3.1.11
CHARGING
..........................................................................................16
3.1.12
SIM CARD INTERFACE
........................................................................16
3.1.13
AUDIO INTERFACE
.............................................................................16
3.1.14
NETWORK SIGNAL INDICATION
.........................................................17
3.2
MODULE’S POWER CONSUMPTION
..............................................................17
3.3
RELIABILITY CHARACTERISTICS
..................................................................17
3.4
ESD CHARACTERISTICS
................................................................................18
4
INTERFACE CIRCUIT DESIGN
.......................................................................................... 19
4.1
RESET AND POWER DESIGN
.......................................................................19
