LZT 123 1836
4
3
ABBREVIATIONS .................................................................................... 20
Integrating the Wireless Modem ................................................................. 22
4
Mechanical Description......................................................................... 23
4.1
INTERFACE DESCRIPTION ........................................................................................ 23
4.2
PHYSICAL DIMENSIONS ........................................................................................... 25
5
System Connector Interface.................................................................. 26
5.1
OVERVIEW .............................................................................................................. 26
5.2
DEALING WITH UNUSED PINS................................................................................... 30
5.3
GENERAL ELECTRICAL AND LOGICAL CHARACTERISTICS.......................................... 31
5.4
GROUNDS............................................................................................................... 32
5.4.1
ANALOGUE GROUND (AREF) ............................................................................. 32
5.4.2
COMMON GROUND (GND)................................................................................ 33
5.5
REGULATED POWER SUPPLY INPUT (VCC)................................................................. 34
5.6
VOLTAGE REFERENCE (VREF) ................................................................................... 36
5.7
BATTERY CHARGING INPUT (CHG_IN) ...................................................................... 37
5.7.1
CHARGING PROCESS ........................................................................................ 38
5.7.2
SERIES DIODE................................................................................................... 39
5.7.3
BATTERY SELECTION........................................................................................ 39
5.8
POWERING THE MODULE ON AND OFF (PON_L, PON_H) ........................................... 43
5.8.1
VREF AS A POWER INDICATOR.......................................................................... 43
5.8.2
MODULE ON & OFF SEQUENCE ......................................................................... 44
5.8.2.1
POWER ON TIMING ...................................................................................... 45
5.8.3
TURNING THE MODULE OFF ............................................................................. 46
5.9
ANALOGUE AUDIO .................................................................................................. 48
5.9.1
AUXILIARY AUDIO TO MOBILE STATION (AUXIP, AUXIN) .................................... 49
5.9.2
AUXILIARY AUDIO FROM MOBILE STATION (AUXOP, AUXON)............................. 49
5.9.3
MICROPHONE SIGNALS (MICIP, MICIN) .............................................................. 50
5.9.4
SPEAKER SIGNALS (EARP, EARN) ....................................................................... 51
5.10
PCM DIGITAL AUDIO (SSP) ................................................................................... 51
5.10.1
PCM DATA FORMAT......................................................................................... 51
5.11
SERIAL DATA INTERFACES ................................................................................... 53
5.11.1
UART1............................................................................................................. 53
