User's Manual

CL865-DUAL Hardware User Guide
1vv0301104 Rev.1 – 2014-03-07
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 6 of 70
Mod. 0805 2011-07 Rev.2
7.1. CDMA Antenna Requirements ................................ 31
7.1.1. CL865 Antenna – PCB line Guidelines ........................ 32
7.2. PCB Guidelines in case of FCC certification .............. 33
7.2.1. Transmission line design ................................... 33
7.2.2. Transmission line measurements ............................. 34
7.3. Antenna - Installation Guidelines ........................ 36
8. USB Port .................................................... 37
9. Serial Port ................................................. 38
9.1. Modem Serial Port 1 ...................................... 39
9.2. Modem Serial Port 2 ...................................... 41
9.3. RS232 Level Translation .................................. 42
10. Audio Section Overview ...................................... 44
10.1. Analog Audio Interface (AVI) ........................... 44
10.1.1. MIC Connection ........................................... 45
10.1.2. EAR Connection ........................................... 46
10.2. Digital Voice Interface (DVI) .......................... 47
10.2.1. CODEC Example ............................................ 47
11. General Purpose I/O ......................................... 48
11.1. Logic Level Specification .............................. 49
11.2. Using a GPIO Pad as Input .............................. 49
11.3. Using a GPIO Pad as Output ............................. 50
11.4. Using the Alarm Output GPIO6 ........................... 50
11.5. Indication of Network Service Availability ............. 51
11.6. RTC Bypass Output ...................................... 52
11.7. VAUX/PWRMON Power Output ............................... 52
12. DAC and ADC Section ......................................... 53
12.1. DAC converter .......................................... 53
12.1.1. Description .............................................. 53
12.1.2. Enabling DAC ............................................. 53
12.1.3. Low Pass Filter Example .................................. 54
12.2. ADC converter .......................................... 54
12.2.1. Description .............................................. 54