CC864-DUAL Hardware User Guide
1vv0300791 Rev 4.4 – 2011-01-26
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights Reserved.
Page 4 of 63
3.2.2.
Initialization and Activation state ................................................................................. 17
3.2.3.
Turning Off the CC864-DUAL ..................................................................................... 18
3.2.3.1.
Hardware Shutdown ............................................................................................. 19
3.2.3.2.
Software Shutdown .............................................................................................. 19
3.2.4.
Hardware Reset .......................................................................................................... 19
3.2.5.
Summary of Turning ON and OFF the CC864-DUAL ................................................. 21
3.3.
Power Supply ......................................................................................................... 21
3.3.1.
+5V Input Source Power Supply Design Guidelines ................................................... 23
3.3.2.
+12V Input Source Power Supply Design Guidelines ................................................. 23
3.3.3.
Battery Source Power Supply Design Guidelines ....................................................... 25
3.3.4.
Battery Charge Control Circuitry Design Guideline ..................................................... 26
3.3.4.1.
Trickle Charging ................................................................................................... 27
3.3.4.2.
Constant Current Charging .................................................................................. 27
3.3.4.3.
Constant Voltage Charging .................................................................................. 28
3.3.4.4.
Pulse Charging ..................................................................................................... 28
3.3.5.
Thermal Design Guidelines ......................................................................................... 29
3.3.6.
Power Supply PCB Layout Guidelines ........................................................................ 29
3.4.
Antenna Requirements .......................................................................................... 31
3.4.1.
FCC’s RF Exposure Rules and Regulations ............................................................... 32
3.4.2.
Antenna Installation Guideline ..................................................................................... 32
3.5.
GPS path Architecture and antenna ....................................................................... 32
3.5.1.
GPS Antenna Requirements (Path 1) ......................................................................... 33
3.5.2.
Combined Cellular/GPS Antenna Requirements (Path 2) ........................................... 33
3.5.3.
Linear and Patch GPS Antennas (Path 1) ................................................................... 33
3.5.4.
Active GPS Antenna LNA and Front End Design Considerations (Path 1) ................. 34
3.6.
GPS Antenna – Installation Guidelines .................................................................. 34
3.7.
Logic Level Specification ........................................................................................ 34
3.8.
Serial Interfaces ..................................................................................................... 35
3.8.1.
UART - Serial Interface ............................................................................................... 35
3.8.1.1.
Diagnostic Monitor Port ........................................................................................ 36
3.8.1.2.
RS232C Interface and Level Translation ............................................................. 37
3.8.1.3.
5V UART Level Translation .................................................................................. 38
3.8.2.
USB Interface .............................................................................................................. 39
3.8.2.1.
USB Transceiver Specifications ........................................................................... 40
3.9.
Analog Audio Interface ........................................................................................... 41
3.9.1.
Input lines (microphone) .............................................................................................. 42
3.9.2.
Output lines (Speaker) ................................................................................................ 43
3.9.3.
General Design Rules ................................................................................................. 43
