Datasheet

TABLE OF CONTENTS

Overview . . . . . . . . . . . . . . . . 1

I 2 C-bus System Diagram . . . . 2

General Purpose Input

Output (GPIO) Expanders. . . .3

Thermal Sensors and

Voltage Management . . . . . . 6

LCD Display Drivers. . . . . . . . 8

Clocks and

Real Time Clocks . . . . . . . . . 11

Tiny Serial Analog-to-Digital and Digital-to-Analog

Converters . . . . . . . . . . . . . . 12

Multiplexers and Switches...13

Bus Buffers and

Voltage Translators . . . . . . . 15

I 2 C-Controlled EEPROM,

RAM and DIP Switches

(multiplexed/latched

EEPROMS) . . . . . . . . . . . . . . 18

Intelligent Stepper

Motor Controller . . . . . . . . . 20

Bridge Integrated Circuits and Bus Controllers . . . . . . . 21

Blinkers, Dimmers, Drivers

(LED Controllers) . . . . . . . . . 23

Capacitive Sensors . . . . . . . 25

Demo Boards. . . . . . . . . . . . 27

Resources. . . . . . . . . . . . . . . 28

Contact Information . . . . . . 29

I 2 C-bus Components Selection Guide

Overview

By replacing complex parallel interfaces with a straightforward yet powerful serial structure, the Inter-Integrated Circuit (I 2 C) bus revolutionized chip-to-chip communications. The I 2 C-bus shrinks integrated circuit (IC) footprints by reducing connection count, leading to lower IC costs, which in turn simplifies printed circuit board (PCB) design complexity and reduces system cost. This bus components selection guide provides an overview of NXP’s deep

I 2 C-bus solutions portfolio.

History

As electronic designs grew in complexity, a need developed for an easy and more cost effective way to connect peripheral devices to their controlling microprocessors. To meet this need, Philips

Semiconductors (now NXP Semiconductors) invented a simple bidirectional 2-wire bus. Originally created over thirty years ago for television applications, the I 2 C-bus has since become a de facto industry standard supported by many companies.

I 2 C Features

The I 2 C-bus requires only two lines: a serial data line (SDA) and a serial clock line (SCL). Each device connected to the bus is software addressable by a unique address, and simple master/ slave relationships exist at all times.

Operation

Serial 8-bit bidirectional data transfers occur at up to 100kbit/s in the Standard mode, up to 400kbit/s in Fast-mode (Fm), up to

1Mbit/sec in Fast-mode plus (Fm+), up to 3.4 Mbit/s in high-speed mode (Hs), and up to 5 Mbits/s (unidirectional) in the new Ultra-

Fast-mode (UFm).

I 2 C Applications

Although originally designed to link a small number of devices locally, improvements to bus speed options and the introduction of bus extension devices has allowed the use of the I 2 C-bus to grow from applications such as cell phones and car radios to systems spanning rooms and even buildings.

I 2 C Specification

For the I 2 C-bus specification and user manual, please visit: http://www.nxp.com/documents/user_manual/UM10204.pdf

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