User Guide

ME910G1 Preliminary HW Design Guide
1VV0301593 Rev.2 Page 7 of 95 2020-01-13
Pin-out ........................................................................................ 16
LGA Pads Layout ........................................................................ 26
4. POWER SUPPLY ....................................................................... 27
Power Supply Requirements ....................................................... 27
Power Consumption ................................................................... 29
General Design Rules ................................................................. 30
4.3.1. Electrical Design Guidelines of the power supply ........................ 30
4.3.1.1. +5V Source Power Supply Design Guidelines ............................ 30
4.3.1.2. +12V Source Power Supply Design Guidelines .......................... 31
4.3.1.3. Battery Source Power Supply Design Guidelines ........................ 32
4.3.2. Thermal Design Guidelines ......................................................... 33
4.3.3. Power Supply PCB layout Guidelines ......................................... 33
VAUX Power Output ................................................................... 36
RTC Supply ................................................................................ 36
5. DIGITAL SECTION .................................................................... 37
Logic Levels ................................................................................ 37
Power On.................................................................................... 38
Power Off.................................................................................... 42
Wake from deep sleep mode ...................................................... 44
Unconditional Shutdown ............................................................. 44
Fast power down ........................................................................ 47
5.6.1. Fast Shut Down by Hardware ..................................................... 48
5.6.2. Fast Shut Down by Software....................................................... 48
Communication ports .................................................................. 49
5.7.1. USB 2.0 HS ................................................................................ 49
5.7.2. SPI.............................................................................................. 50
5.7.3. Serial Ports ................................................................................. 51
5.7.3.1. Modem serial port 1 .................................................................... 51
5.7.3.2. Modem serial port 2 .................................................................... 53
5.7.3.3. RS232 level translation ............................................................... 54
General purpose I/O ................................................................... 55
5.8.1. Using a GPIO as INPUT ............................................................. 56
5.8.2. Using a GPIO as OUTPUT ......................................................... 57
5.8.3. Indication of network service availability ..................................... 57
External SIM Holder .................................................................... 58
ADC Converter ........................................................................... 58