User Guide

LM960 HW Design Guide
1VV0301485 Rev. 3 Page 6 of 74 2018-12-14
4. POWER SUPPLY ........................................................................ 28
Power Supply Requirements ........................................................ 28
Power Consumption ..................................................................... 28
General Design Rules .................................................................. 29
4.3.1. Electrical Design Guidelines ......................................................... 29
4.3.1.1. + 5V Input Source Power Supply – Design Guidelines ................ 29
4.3.2. Thermal Design Guidelines .......................................................... 30
4.3.3. Power Supply PCB layout Guidelines .......................................... 31
RTC .............................................................................................. 31
Reference Voltage ........................................................................ 31
Internal LDO for GNSS bias ......................................................... 32
5. ELECTRICAL SPECIFICATIONS ................................................ 33
Absolute Maximum Ratings – Not Operational ............................. 33
Recommended Operating Conditions .......................................... 33
6. DIGITAL SECTION ...................................................................... 34
Logic Levels ................................................................................. 34
6.1.1. 1.8V Pins – Absolute Maximum Ratings ...................................... 34
6.1.2. 1.8V Standard GPIOs ................................................................... 34
6.1.3. 1.8V SIM Card Pins ...................................................................... 35
6.1.4. 2.85V Pins – Absolute Maximum Ratings .................................... 35
6.1.5. SIM Card Pins @2.85V ................................................................ 35
Power On ..................................................................................... 36
6.2.1. Initialization and Activation State .................................................. 36
Power Off ..................................................................................... 37
Reset ............................................................................................ 38
6.4.1. Graceful Reset ............................................................................. 38
6.4.2. Unconditional Hardware Reset ..................................................... 39
Communication ports ................................................................... 39
6.5.1. USB Interface ............................................................................... 40
6.5.2. PCIe Interface .............................................................................. 42
6.5.3. SIM Interface ................................................................................ 44
6.5.3.1. SIM Schematic Example .............................................................. 44
6.5.4. Control Signals ............................................................................. 45
6.5.4.1. W_DISABLE_N ............................................................................ 45
6.5.4.2. WAN_LED_N ............................................................................... 45
6.5.5. General Purpose I/O .................................................................... 46
6.5.5.1. Using a GPIO Pin as Input ........................................................... 46