User's Guide

LE910Cx HW User Guide
Doc#: 1VV0301298
Rev. 13.0 Page 6 of 124 2019-07-15
4.3.4. 1.8V SIM Card Pads ......................................................................................40
4.3.5. Dual Voltage Pads - Absolute Maximum Ratings ...........................................40
4.3.6. SD Card Pads @ 2.95V .................................................................................40
4.3.7. SIM Card Pads @2.95V.................................................................................41
5. HARDWARE COMMANDS ........................................................................... 42
Turning on the LE910Cx Module ...................................................................42
Initialization and Activation State ...................................................................42
Turning off the LE910Cx Module ...................................................................45
5.3.1. Shutdown by Software Command ..................................................................46
5.3.2. Hardware Shutdown ......................................................................................47
5.3.3. Unconditional Hardware Shutdown ................................................................48
Powering OFF the Module .............................................................................49
Fast Power Down ..........................................................................................50
5.5.1. Fast Shut Down by Hardware ........................................................................50
5.5.2. Fast Shut Down by Software..........................................................................52
6. POWER SUPPLY .......................................................................................... 53
Power Supply Requirements ..........................................................................53
Power Consumption ......................................................................................53
General Design Rules ....................................................................................55
6.3.1. Electrical Design Guidelines ..........................................................................55
6.3.1.1. + 5V Input Source Power Supply – Design Guidelines ...................................55
6.3.1.2. + 12V Input Source Power Supply – Design Guidelines .................................56
6.3.1.3. Battery Source Power Supply – Design Guidelines ........................................57
6.3.2. Thermal Design Guidelines ............................................................................58
6.3.3. Power Supply PCB Layout Guidelines ...........................................................59
7. ANTENNA(S) ................................................................................................ 60
GSM/WCDMA/TD-SCDMA/LTE Antenna Requirements ...............................60
GSM/WCDMA/TD-SCDMA/LTE Antenna – PCB Line Guidelines ..................61
GSM/WCDMA/LTE Antenna – Installation Guidelines....................................62
Antenna Diversity Requirements ....................................................................62
GNSS Antenna Requirements .......................................................................63
7.5.1. Combined GNSS Antenna .............................................................................63
7.5.2. Linear and Patch GNSS Antenna ..................................................................64
7.5.3. Front End Design Considerations ..................................................................64
7.5.4. GNSS Antenna – PCB Line Guidelines ..........................................................64
8. HARDWARE INTERFACES .......................................................................... 66
USB Port........................................................................................................67