User's Manual

GE865 Hardware User Guide
1vv0300799 Rev.11 – 13-07-2010
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9.2 RS232 LEVEL TRANSLATION ............................................................................................................................................ 44
9.3 5V UART LEVEL TRANSLATION ........................................................................................................................................ 48
10 AUDIO SECTION OVERVIEW ........................................................................................................................... 50
10.1 ELECTRICAL CHARACTERISTICS ..................................................................................................................................... 51
10.1.1 Input Lines ......................................................................................................................................................... 51
10.1.2 Output Lines ....................................................................................................................................................... 52
11 GENERAL PURPOSE I/O ................................................................................................................................. 53
11.1 GPIO LOGIC LEVELS ...................................................................................................................................................... 54
11.2 USING A GPIO PAD AS INPUT ...................................................................................................................................... 56
11.3 USING A GPIO PAD AS OUTPUT ................................................................................................................................... 56
11.4 USING THE RF TRANSMISSION CONTROL GPIO4 ............................................................................................................ 56
11.5 USING THE RFTXMON OUTPUT GPIO5 ........................................................................................................................ 57
11.6 USING THE ALARM OUTPUT GPIO6 ................................................................................................................................ 57
11.7 USING THE BUZZER OUTPUT GPIO7 .............................................................................................................................. 58
11.8 MAGNETIC BUZZER CONCEPTS ...................................................................................................................................... 59
11.8.1 Short Description .............................................................................................................................................. 59
11.8.2 Frequency Behaviour ........................................................................................................................................ 59
11.8.3 Power Supply Influence ................................................................................................................................... 60
11.8.4 Working Current Influence .............................................................................................................................. 60
11.9 INDICATION OF NETWORK SERVICE AVAILABILITY ............................................................................................................. 61
11.10 RTC BYPASS OUT ........................................................................................................................................................ 63
11.11 EXTERNAL SIM HOLDER IMPLEMENTATION .................................................................................................................. 63
12 DAC AND ADC SECTION ................................................................................................................................. 64
12.1 DAC CONVERTER .......................................................................................................................................................... 64
12.1.1 Description ......................................................................................................................................................... 64
12.1.2 Enabling DAC ..................................................................................................................................................... 65
12.1.3 Low Pass Filter Example ................................................................................................................................. 65
12.2 ADC CONVERTER .......................................................................................................................................................... 66
12.2.1 Description ......................................................................................................................................................... 66
12.2.2 Using ADC Converter ........................................................................................................................................ 66
13 MOUNTING THE GE865 ON YOUR BOARD .................................................................................................... 67
13.1 GENERAL ...................................................................................................................................................................... 67
13.2 MODULE FINISHING & DIMENSIONS ................................................................................................................................ 67
13.3 RECOMMENDED FOOT PRINT FOR THE APPLICATION ........................................................................................................ 68
13.4 DEBUG OF THE GE865 IN PRODUCTION .......................................................................................................................... 69
13.5 STENCIL ........................................................................................................................................................................ 69
13.6 PCB PAD DESIGN .......................................................................................................................................................... 70
13.7 SOLDER PASTE .............................................................................................................................................................. 72
13.7.1 GE865 Solder reflow ......................................................................................................................................... 73
14 PACKING SYSTEM ........................................................................................................................................... 76
14.1 MOISTURE SENSIBILITY .................................................................................................................................................. 77
15 CONFORMITY ASSESSMENT ISSUES............................................................................................................ 78