User ManualTable of ContentsIntroduction9Scope9Audience9Contact Information, Support9Document Organization10Text Conventions11Related Documents11General Product Description12Overview12LE920 Mechanical Dimensions13Weight13Environmental requirements14Temperature range14RoHS compliance14Operating Frequency15WCDMA1700 – B415(LE920-NA only)151710 ~ 1755152110 ~ 215515Tx: 1312 ~ 151315Rx: 9662 ~ 993815400 MHz15LE920 Module Connections17PIN-OUT17LGA Pads Layout24Hardware Commands25Turning ON the LE92025Initialization and Activation state25Turning OFF the LE92027Shutdown by Software Command28Hardware Shutdown29Hardware Unconditional Restart30Hardware Unconditional Shutdown31Summary of Turning ON and OFF the module32Power Supply33Power Supply Requirements33General Design Rules35Electrical Design Guidelines35+ 5V Input Source Power Supply Design Guidelines35+ 12V Input Source Power Supply Design Guidelines36Battery Source Power Supply Design Guidelines38Thermal Design Guidelines39Power Supply PCB Layout Guidelines40Antenna(s)42GSM/WCDMA/LTE Antenna Requirements42GSM/WCDMA/LTE Antenna – PCB line Guidelines43GSM/WCDMA/LTE Antenna – Installation Guidelines44Antenna Diversity Requirements44GPS/GNSS Antenna Requirements45Combined GPS/GNSS Antenna45Linear and Patch GPS/GNSS Antenna46Front End Design Considerations46GPS/GNSS Antenna - PCB Line Guidelines46GPS/GNSS Antenna – Installation Guidelines47Logic Level Specifications48USB Port49Serial Ports50Modem Serial Port 151Modem Serial Port 252RS232 Level Translation52Audio Section Overview54Digital Audio54General Purpose I/O56Logic Level Specifications57Using a GPIO Pad as Input57Using a GPIO Pad as Output58Using the Temperature Monitor Function59Short Description59Indication of Network Service Availability59RTC Bypass Out60VAUX Power Output60ADC section61ADC Converter61Description61Using ADC Converter61Mounting the module on your board62General62Finishing & Dimensions62Recommended foot print for the application63Stencil64PCB Pad Design64Recommendations for PCB Pad Dimensions (mm)64Solder Paste66Solder Reflow66Application guide68Debug of the LE920 in production68Bypass capacitor on Power supplies69SIM interface69EMC recommendations (TBD)70Download and Debug Port71Packing system72Tray Drawing73Moisture Sensibility74Safety Recommendations75Document History76Size: 1.88 MBPages: 76Language: EnglishOpen manual