Neoway Neo_M680, Руководство пользователя по оборудованию

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Neo_M680 GPRS Module Hardware User Guide
Copyright © Neoway Technology Co., Ltd v
Table of Figures
Figure 2-1 Top view of the M680 module ............................................................................................... 4
Figure 2-2 PCB foot print recommended for M680 (unit: mm) .............................................................. 8
Figure 3-1 Current peaks and voltage drops ............................................................................................ 9
Figure 3-2 Capacitors used for the power supply .................................................................................. 10
Figure 3-3 Reference design of power supply control ........................................................................... 10
Figure 3-4 Reference design of power supply controlled by p-MOSFET ..............................................11
Figure 3-5 Reference designs of separated power supply ...................................................................... 12
Figure 3-6 VRTC reference design ........................................................................................................ 13
Figure 3-7 Power-on procedure ............................................................................................................. 13
Figure 3-8 Power-off procedure............................................................................................................. 14
Figure 3-9 Reference circuit for power-on/off control .......................................................................... 14
Figure 3-10 Reference circuit for power-on/off controlled by high level .............................................. 15
Figure 3-11 Reset circuit with triode separating .................................................................................... 16
Figure 3-12 Signal connection between DCE and DTE ........................................................................ 16
Figure 3-13 Recommended circuit for the communication between 3.3V MCU and UART ................ 17
Figure 3-14 Recommended circuit for the communication between 5V MCU and UART ................... 18
Figure 3-15 USB circuit ........................................................................................................................ 19
Figure 3-16 RING indicator for incoming call ...................................................................................... 20
Figure 3-17 RING indicator for SMS .................................................................................................... 20
Figure 3-18 Reference design of SIM card interface ............................................................................. 21
Figure 3-19 Reference of SIM card socket ............................................................................................ 21
Figure 3-20 LED indicator..................................................................................................................... 22
Figure 3-21 Reference design of single-end input MIC interface .......................................................... 23
Figure 3-22 Reference design of MIC differential connections ............................................................. 24
Figure 3-23 Reference design for common audio input ........................................................................ 24
Figure 3-24 Reference design for receiver output ................................................................................. 25
Figure 3-25 Reference design for speaker output .................................................................................. 25
Figure 3-26 Reference design for earphone output ................................................................................ 26
Figure 3-27 Coupling capacitor interfacing ........................................................................................... 26
Figure 3-28 Reference design for antenna interface .............................................................................. 27
Figure 3-29 RF layout reference ............................................................................................................ 27
Figure 3-30 Encapsulation specifications of Murata RF connector ....................................................... 28
Figure 3-31 RF connections................................................................................................................... 28