Neoway WM620 - Default Chapter; Table of Contents

WM620 Hardware User Guide
Copyright © Neoway Technology Co., Ltd
iii
Contents
1 Introduction to WM620 .................................................................................................... 1
1.1 Overview ............................................................................................................................................ 1
1.2 Block Diagram ................................................................................................................................... 1
1.3 Specifications ..................................................................................................................................... 2
2 Pin Description and PCB Foot Print .............................................................................. 4
2.1 Specifications ..................................................................................................................................... 4
2.2 Pin Definition ..................................................................................................................................... 5
2.3 PCB Foot Print ................................................................................................................................... 7
3 Interface Design ................................................................................................................. 8
3.1 Power Supply and Switch Interfaces .................................................................................................. 8
3.1.1 VBAT ........................................................................................................................................ 8
3.1.2 VRTC .......................................................................................................................................11
3.1.3 VDD ........................................................................................................................................ 12
3.1.4 ON_OFF Pin and Power-on Procedure ................................................................................... 12
3.1.5 RESET .................................................................................................................................... 14
3.2 Running Status Indication ................................................................................................................ 15
3.2.1 LED Indicator .......................................................................................................................... 15
3.2.2 RING Pin ................................................................................................................................. 16
3.3 USIM Card Interface ........................................................................................................................ 17
3.4 USB Interfaces ................................................................................................................................. 19
3.5 UART ............................................................................................................................................... 20
3.5.1 Basic Descriptions of UART ................................................................................................... 20
3.5.2 Level Shifting for UART ......................................................................................................... 21
3.6 Sleep Mode ....................................................................................................................................... 22
3.6.1 UART Control ......................................................................................................................... 23
3.6.2 USB Control ............................................................................................................................ 23
3.7 Audio Interface ................................................................................................................................. 25
3.8 ADC .................................................................................................................................................. 27
3.9 RF Interface ...................................................................................................................................... 28
4 RF Features........................................................................................................................ 30
4.1 Work Band ........................................................................................................................................ 30
4.2 Transmitting Power and Receiving Sensitivity ................................................................................. 30
4.2.1 Transmitting Power ................................................................................................................. 30
4.2.2 Receiving Sensitivity............................................................................................................... 30