Telit Wireless Solutions NL865B1, Руководство пользователя

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NL865B1 HW Design Guide
1VV0301450 Rev. 1 Page 6 of 72 2017-11-20
4.3.1.1. +5V Source Power Supply Design Guidelines ............................ 24
4.3.1.2. +12V Source Power Supply Design Guidelines .......................... 25
4.3.1.3. Battery Source Power Supply Design Guidelines ........................ 26
4.3.2. Thermal Design Guidelines ......................................................... 27
4.3.3. Power Supply PCB layout Guidelines ......................................... 28
VAUX/PWRMON Power Output .................................................. 29
3GPP Power Saving Mode (PSM) .............................................. 30
4.5.1. LP_WAKE design guide .............................................................. 31
5. DIGITAL SECTION .................................................................... 32
Logic Levels ................................................................................ 32
Power On.................................................................................... 33
Unconditional Restart.................................................................. 35
Power OFF procedure ................................................................ 38
Communication ports .................................................................. 39
5.5.1. Serial Ports ................................................................................. 39
5.5.1.1. MODEM SERIAL PORT 1 .......................................................... 39
5.5.1.2. MODEM SERIAL PORT 2 .......................................................... 41
5.5.1.3. RS232 LEVEL TRANSLATION ................................................... 42
General purpose I/O ................................................................... 44
5.6.1. Using a GPIO as INPUT ............................................................. 45
5.6.2. Using a GPIO as OUTPUT ......................................................... 46
I2C Port ...................................................................................... 46
SIM Interface .............................................................................. 46
5.8.1. SIMIN Detection .......................................................................... 46
ADC Converter ........................................................................... 47
6. RF SECTION .............................................................................. 48
Bands Variants ........................................................................... 48
TX Output power ......................................................................... 48
RX Sensitivity ............................................................................. 48
RED requirements ...................................................................... 48
Antenna requirements................................................................. 49
6.5.1. Main Antenna ............................................................................. 49
6.5.2. PCB design guidelines ................................................................ 50
6.5.3. Antenna installation Guidelines ................................................... 51
7. MECHANICAL DESIGN ............................................................. 52
Mechanical Dimensions .............................................................. 52