User's Manual

LE940B6 Hardware User Guide
1VV0301331 Rev. 1.8 - 2017-03-15
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List of Figures
Figure 1: LE940B6 High-level Functionality ...................................................................................... 18
Figure 2: LGA Pads Layout LE940B6 334 Pads Top View .................................................................. 38
Figure 3: Power-on Circuit ................................................................................................................ 44
Figure 4: LE940B6 Initialization and Activation ................................................................................ 45
Figure 5: Power-up Flow Chart ......................................................................................................... 46
Figure 6: AT Command Managing Flow Chart .................................................................................. 47
Figure 7: Shutdown by Software Command ..................................................................................... 49
Figure 8: Hardware Shutdown .......................................................................................................... 50
Figure 9: Circuit for Unconditional Hardware Reset ........................................................................ 51
Figure 10: Circuit for Unconditional Hardware Shutdown ............................................................... 52
Figure 11: Turn Off Procedure .......................................................................................................... 53
Figure 12: Example of Linear Regulator with 5V Input ..................................................................... 58
Figure 13: Example of Switching Regulator with 12V Input – Part 1 ................................................ 59
Figure 14: Example of Switching Regulator with 12V Input – Part 2 ................................................ 59
Figure 15: ESD Protection for USB2.0 ............................................................................................... 71
Figure 16: RS232 Level Adaption Circuitry Example ......................................................................... 75
Figure 17: RS232 Serial Port Lines Connection Layout ..................................................................... 75
Figure 18: SPI Signal Connectivity ..................................................................................................... 76
Figure 19: GPIO Output Pad Equivalent Circuit ................................................................................ 81
Figure 20: Status LED circuit example .............................................................................................. 82
Figure 21: Fuel Gauge Connectivity Example ................................................................................... 84
Figure 22: Application Module Top View ......................................................................................... 86
Figure 23: PCB Pad Design ................................................................................................................ 87
Figure 24: PCB Pad Dimensions ........................................................................................................ 88
Figure 25: Inhibit Area for Micro-via ................................................................................................ 88
Figure 26: Solder Reflow Profile ....................................................................................................... 89
Figure 27: SIM Schematics ................................................................................................................ 93
Figure 28: Tray Packing ..................................................................................................................... 97
Figure 29: Tray Drawing .................................................................................................................... 98