Titan LE940B6, Hw User Manual

Page: 7 / 111

LE940B6 HW User Guide
Rev. 2.02
Page 7 of 111 2020-01-10
5. HARDWARE COMMANDS ............................................................................ 47
Turning on the LE940B6 Module .................................................................... 47
Initialization and Activation State .................................................................... 47
Turning off the LE940B6 Module .................................................................... 51
5.3.1. Shutdown by Software Command .................................................................. 52
5.3.2. Hardware Shutdown ....................................................................................... 53
5.3.3. Unconditional Hardware Reset (RESET_N) ................................................... 54
5.3.4. Unconditional Hardware Shutdown ................................................................ 55
6. POWER SUPPLY ........................................................................................... 57
Power Supply Requirements .......................................................................... 57
General Design Rules..................................................................................... 60
6.2.1. Electrical Design Guidelines ........................................................................... 60
6.2.1.1. + 5V Input Source Power Supply
– Design Guidelines ................................... 60
6.2.1.2. + 12V Input Source Power Supply
– Design Guidelines ................................. 61
6.2.1.3. Battery Source Power Supply
– Design Guidelines ........................................ 63
6.2.2. Thermal Design Guidelines ............................................................................ 63
6.2.3. Power Supply PCB Layout Guidelines ........................................................... 64
7. ANTENNA(S) ................................................................................................. 66
GSM/WCDMA/TD-SCDMA/LTE Antenna Requirements ............................... 66
GSM/WCDMA/TD-SCDMA/LTE Antenna
– PCB Line Guidelines .................. 66
GSM/WCDMA/TD-SCDMA/LTE Antenna
– Installation Guidelines ................ 67
Secondary Antenna Requirements ................................................................. 68
PCB Guidelines in Case of FCC Certification ................................................. 68
7.5.1. Transmission Line Design .............................................................................. 68
7.5.2. Transmission Line Measurements .................................................................. 69
8. HARDWARE INTERFACES .......................................................................... 71
USB Port ......................................................................................................... 72
Serial Ports ..................................................................................................... 74
8.2.1. Modem Serial Port 1 ....................................................................................... 74
8.2.2. Modem Serial Port 2 ....................................................................................... 75
8.2.3. Modem Serial Port 3 ....................................................................................... 76
8.2.4. RS232 Level Translation ................................................................................ 77
Peripheral Ports .............................................................................................. 79
8.3.1. SPI
– Serial Peripheral Interface .................................................................... 79
8.3.2. I2C - Inter-integrated Circuit ........................................................................... 80
Ethernet Interface ........................................................................................... 80
Audio Interface................................................................................................ 82
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