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

 

 

LZT 123 1836

4