Telit Wireless Solutions GE866-QUAD, Руководство пользователя по оборудованию

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GE866-QUAD Hardware User Guide
1VV0301051 Rev. 11 – 2019-12-05
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 6 of 82
Mod. 0805 2011-07 Rev.2
7.1. GSM Antenna Requirements ..................................................................................... 37
7.1.1. GE866-QUAD Antenna – PCB line Guidelines ................................................................ 37
7.2. PCB Design Guidelines .............................................................................................. 39
7.2.1. Transmission line design ............................................................................................... 39
7.2.2. Transmission line measurements ................................................................................. 40
7.3. GSM Antenna - installation Guidelines...................................................................... 41
8. Logic levels specifications ............................................................................................ 42
8.1. Reset signal ............................................................................................................... 43
9. Serial Ports ................................................................................................................... 44
9.1. Modem Serial Port ..................................................................................................... 44
9.2. RS232 levels translation ............................................................................................ 46
10. Audio Section Overview ............................................................................................. 48
10.1. MIC Connection....................................................................................................... 48
10.2. LINE-IN connection ................................................................................................ 49
10.3. EAR Connection ...................................................................................................... 51
10.4. Electrical Characteristics ....................................................................................... 53
10.4.1. Input lines ...................................................................................................................... 53
10.4.2. Output lines .................................................................................................................... 54
11. General Purpose I/O .................................................................................................. 55
11.1. GPIO Logic Levels ................................................................................................... 56
11.2. Using a GPIO Pad as INPUT ................................................................................... 57
11.3. Using a GPIO Pad as OUTPUT ................................................................................ 57
11.4. Using the RF Transmission Control GPIO4 ............................................................ 57
11.5. Using the RFTXMON Output GPIO5 ........................................................................ 58
11.6. Using the ALARM/BUZZER output GPIO6 .............................................................. 58
11.7. Magnetic Buzzer Concepts ..................................................................................... 60
11.7.1. Short Description ........................................................................................................... 60
11.7.2. Frequency Behaviour ..................................................................................................... 61
11.7.3. Power Supply Influence ................................................................................................. 61
11.7.4. Working Current Influence ............................................................................................ 61