Neoway WM620 - Page 6

WM620 Hardware User Guide
Copyright © Neoway Technology Co., Ltd
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Table of Figures
Figure 2-1 Bottom view of the WM620 module ..................................................................................... 4
Figure 2-2 PCB foot print recommended for WM620 (unit: mm) .......................................................... 7
Figure 3-1 Current peaks and voltage drops ........................................................................................... 9
Figure 3-2 Power supply design .............................................................................................................. 9
Figure 3-3 Reference design of power supply controlled by MIC29302 .............................................. 10
Figure 3-4 Reference design of power supply controlled by p-MOSFET ............................................. 10
Figure 3-5 RTC reference design ...........................................................................................................11
Figure 3-6 Reference circuit of ON_OFF controlled by high level ....................................................... 13
Figure 3-7 Power-on procedure ............................................................................................................. 13
Figure 3-8 Reset circuit ......................................................................................................................... 14
Figure 3-9 Reference circuit of LED indicator...................................................................................... 16
Figure 3-10 Circuit for brighter LED .................................................................................................... 16
Figure 3-11 RING indicator for incoming call ...................................................................................... 16
Figure 3-12 RING indicator for SMS ................................................................................................... 16
Figure 3-13 Reference design of USIM card interface ......................................................................... 17
Figure 3-14 Recommended ESD diode array........................................................................................ 18
Figure 3-15 Reference of SIM card socket ........................................................................................... 18
Figure 3-16 Reference USB circuit ....................................................................................................... 19
Figure 3-17 Signal connection between DCE and DTE ........................................................................ 20
Figure 3-18 Recommended circuit between 3.3V MCU and UART ..................................................... 21
Figure 3-19 Recommended circuit between 5V MCU and UART ........................................................ 22
Figure 3-20 Sleep mode controlled by UART ....................................................................................... 23
Figure 3-21 Sleep mode controlled by USB (a) .................................................................................... 24
Figure 3-22 Sleep mode controlled by USB (b) .................................................................................... 24
Figure 3-23 Reference design of MIC differential connections ............................................................ 25
Figure 3-24 Reference design of single-end input MIC interface ......................................................... 26
Figure 3-25 Reference design for speaker differential output ............................................................... 26
Figure 3-26 Reference design for speaker single-ended output ............................................................ 26
Figure 3-27 Reference design for antenna interface .............................................................................. 28
Figure 3-28 RF layout reference ........................................................................................................... 28