HW User Guide Template
1VV0301493 Rev. 2 Page 6 of 86 2018-05-11
4.3.3. Power Supply PCB layout Guidelines ......................................... 29
RTC supply ................................................................................. 30
VAUX Power Output ................................................................... 31
5. DIGITAL SECTION .................................................................... 32
Logic Levels ................................................................................ 32
Power On (Auto-Turning ON ML865) .......................................... 32
Power Off.................................................................................... 35
Wake from deep sleep mode ...................................................... 35
Unconditional Shutdown ( Hardware Unconditional restart) ........ 36
Fast power down ........................................................................ 39
5.6.1. Fast Shut Down by Hardware ..................................................... 39
5.6.2. Fast Shut Down by Software....................................................... 40
Communication ports .................................................................. 40
5.7.1. USB 2.0 HS ................................................................................ 40
5.7.2. SPI.............................................................................................. 42
5.7.3. Serial Ports ................................................................................. 43
5.7.3.1. Modem serial port 1 ................................ .................................... 43
5.7.3.2. Modem serial port 2 ................................ .................................... 45
5.7.3.3. RS232 level translation ............................................................... 46
General purpose I/O ................................................................... 47
5.8.1. Using a GPIO as INPUT ............................................................. 48
5.8.2. Using a GPIO as OUTPUT ......................................................... 49
5.8.3. Indication of network service availability ..................................... 49
External SIM Holder .................................................................... 50
ADC Converter ........................................................................... 50
6. RF SECTION .............................................................................. 52
Bands Variants ........................................................................... 52
TX Output power ......................................................................... 52
RX Sensitivity ............................................................................. 52
Antenna requirements................................................................. 54
6.4.1. PCB Design guidelines ............................................................... 55
6.4.2. PCB Guidelines in case of FCC Certification .............................. 57
6.4.2.1. Transmission line design ............................................................ 57
6.4.2.2. Transmission Line Measurements .............................................. 59
6.4.2.3. Antenna Installation Guidelines ................................................... 61
7. AUDIO SECTION ....................................................................... 62