Shenzhen Coban Electronics Co. Ltd. CB900 用户手册

CONTENTS

Introduction ....................................................................................................................... 3

Abbreviations ......................................................................................................... 3

Safety Precautions ................................................................................................... 4

Technical Specifications ..................................................................................................... 5

General Specifications ............................................................................................. 5

GSM/ GPRS Specifications ..................................................................................... 5

RF Frequencies ....................................................................................................... 6

Baseband Functionalities ......................................................................................... 6

Interface Specifications ........................................................................................... 6

Functional Architecture ...................................................................................................... 7

INTERFACES ................................................................................................................... 8

Pin Assignments...................................................................................................... 8

Pin description ........................................................................................................ 9

Power Supply and Ground ..................................................................................... 11

Operating Modes................................................................................................... 12

Analog to Digital Converter (ADC) ....................................................................... 13

Power ON Control ................................................................................................ 13

Subscriber Identity Module (SIM) Interface ........................................................... 14

Serial Link (UART) Interfaces ............................................................................... 15

USB Interface ....................................................................................................... 17

Analog Audio Interfaces .................................................................................... 18

Microphone input ...................................................................................... 18

Speaker ..................................................................................................... 19

Earphone ................................................................................................... 20

4.11. General Purposes Input / Output ports .................................................................... 21

Keyboard Interface ............................................................................................ 21

2-Wire Serial Interface ...................................................................................... 22

RF interface ...................................................................................................... 22

RF Performance ......................................................................................... 22

Recommendations...................................................................................... 22