User's Guide

LE910Cx Hardware User Guide
1VV0301298 Rev. 1.04 - 2017-05-25
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4.2. Recommended Operating Conditions ............................................................. 43
4.3. Logic Level Specifications ................................................................................. 44
4.3.1. 1.8V Pads - Absolute Maximum Ratings ............................................... 44
4.3.2. 1.8V Standard GPIOs ............................................................................ 44
4.3.3. 1.8V SD Card Pads ................................................................................. 45
4.3.4. 1.8V SIM Card Pads ............................................................................... 45
4.3.5. Dual Voltage Pads - Absolute Maximum Ratings ................................. 46
4.3.6. SD Card Pads @ 2.95V .......................................................................... 46
4.3.7. SIM Card Pads @2.95V ......................................................................... 47
5. Hardware Commands ....................................................................................... 48
5.1. Turning on the LE910Cx Module ...................................................................... 48
5.2. Initialization and Activation State .................................................................... 48
5.3. Turning OFF the LE910Cx Module ................................................................... 50
5.3.1. Shutdown by Software Command ....................................................... 50
5.3.2. Hardware Shutdown ............................................................................. 51
5.3.4. Unconditional Hardware Shutdown ..................................................... 52
6. Power Supply ................................................................................................... 53
6.1. Power Supply Requirements............................................................................ 53
6.2. General Design Rules ....................................................................................... 55
6.2.1. Electrical Design Guidelines .................................................................. 55
6.2.1.1. + 5V Input Source Power Supply – Design Guidelines ......... 55
6.2.1.2. + 12V Input Source Power Supply – Design Guidelines ....... 56
6.2.1.3. Battery Source Power Supply – Design Guidelines .............. 58
6.2.2. Thermal Design Guidelines ................................................................... 59
6.2.3. Power Supply PCB Layout Guidelines ................................................... 60
7. Antenna(s) ....................................................................................................... 61
7.1. GSM/WCDMA/LTE Antenna Requirements ..................................................... 61
7.2. GSM/WCDMA/LTE Antenna – PCB Line Guidelines ......................................... 62
7.3. GSM/WCDMA/LTE Antenna – Installation Guidelines .................................... 63
7.4. Antenna Diversity Requirements ..................................................................... 63