Telit Wireless Solutions GL865 V3, Руководство пользователя

Страница: 6 / 72

HW User Guide
1vv0301018 Rev. 15 Page 6 of 72 2019-01-07
General Design Rules ................................................................. 25
6.3.1. Electrical Design Guidelines ....................................................... 25
6.3.1.1. + 5V input Source Power Supply Design Guidelines ................... 25
6.3.1.2. + 12V input Source Power Supply Design Guidelines ................. 26
6.3.1.3. Battery Source Power Supply Design Guidelines .............................. 27
6.3.2. Thermal Design Guidelines ......................................................... 28
6.3.3. Power Supply PCB layout Guidelines ......................................... 29
7. ANTENNA .................................................................................. 30
GSM Antenna Requirements ...................................................... 30
7.1.1. GL865 V3/V3.1 Antenna – PCB line Guidelines .......................... 30
PCB Design Guidelines .............................................................. 32
7.2.1. Transmission line design ............................................................ 32
7.2.2. Transmission line measurements ............................................... 33
GSM Antenna - Installation Guidelines ....................................... 35
8. LOGIC LEVEL SPECIFICATIONS ............................................. 36
Reset signal ................................................................................ 37
9. SERIAL PORTS ......................................................................... 38
MODEM SERIAL PORT ............................................................. 38
RS232 level translation ............................................................... 40
10. AUDIO SECTION OVERVIEW ................................................... 42
MIC connection ........................................................................... 42
LINE-IN connection ..................................................................... 43
EAR connection .......................................................................... 44
Electrical Characteristics ............................................................. 46
10.4.1. Input Lines .................................................................................. 46
10.4.2. Output Lines ............................................................................... 46
11. GENERAL PURPOSE I/O .......................................................... 47
GPIO Logic levels ....................................................................... 48
Using a GPIO Pad as INPUT ...................................................... 49
Using a GPIO Pad as OUTPUT .................................................. 49
Using the RF Transmission Control GPIO4 ................................. 49
Using the RFTXMON Output GPIO5 ........................................... 49
Using the Alarm Output GPIO6 ................................................... 50
Using the Buzzer Output GPIO7 ................................................. 50
Magnetic Buzzer Concepts ......................................................... 51
11.8.1. Short Description ........................................................................ 51