《I2C总线协议v2.1》.pdf

2 THE I C-BUS SPECIFICATION VERSION 2.1 JANUARY 2000 Philips Semiconductors 2 The I C-bus specification CONTENTS 13.4 Hs-mode devices at lower speed modes. . 24 13.5 Mixed speed modes on one serial bus 1 PREFACE . . . . . . . . . . . . . . . . . . . . . . . . . . .3 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 1.1 Version 1.0 - 1992. . . . . . . . . . . . . . . . . . . . 3 13.5.1 F/S-mode transfer in a mixed-speed bus 1.2 Version 2.0 - 198. . . . . . . . . . . . . . . . . . . . . 3 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 1.3 Version 2.1 - 1999. . . . . . . . . . . . . . . . . . . . 3 13.5.2 Hs-mode transfer in a mixed-speed bus 1.4 Purchase of Philips I2C-bus components . . 3 system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2 THE I2C-BUS BENEFITS DESIGNERS 13.5.3 Timing requirements for the bridge in a AND MANUFACTURERS. . . . . . . . . . . . . . .4 mixed-speed bus system . . . . . . . . . . . . . . 27 14 10-BIT ADDRESSING . . . . . . . . . . . . . . . . 27 2.1 Designer benefits . . . . . . . . . . . . . . . . . . . . 4 2.2 Manufacturer benefits . . . . . . . . . . . . . . . . . 6 14.1 Definition of bits in the first two bytes. . . . . 27 3 INTRODUCTION TO THE I2C-BUS 14.2 F