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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