PCA85132_ Ver la hoja de datos (PDF) - NXP Semiconductors.

Número de pieza

componentes Descripción

Fabricante

PCA85132_

Smart, simple solutions for the 12 most common design concerns

NXP Semiconductors. 

I2C-bus: The serial revolution

By replacing complex parallel interfaces with a straightforward yet powerful serial

structure, the I2C-bus revolutionized chip-to-chip communications.

Invented by NXP (Philips) more than 30 years ago, the I2C-bus uses a simple two-wire

format to carry data one bit at a time. It performs inter-chip addressing, selection,

control, and data transfer. Speeds are up to 400 kHz (Fast-mode), 1 MHz (Fast-mode

Plus), 3.4 MHz (High Speed-mode), or 5 MHz (Ultra Fast-mode).

The I2C-bus shrinks the IC footprint and leads to lower IC costs. Plus, since far fewer

copper traces are needed, it enables a smaller PCB, reduces design complexity, and

lowers system cost.

Parallel Interface

SDA

SCL

uC

I2C Serial Interface

MCU

I/O

A/D

D/A

LCD

RTC

MCU

A0

1010A2A1A0R/W

A1

New function address

A2

New

function

1010011 R/W

New function address

as assigned

I2C-bus devices are available in a wide range of functions. Each slave device has its own I2C-bus address, selectable using

address pins set high (1) or low (0). Information is transmitted byte by byte, and each byte is acknowledged by the receiver.

There can be multiple devices on the same bus, and more than one IC can act as master. The master role is typically played by a

microcontroller.

Write data

S slave address W

Read data

A data A data

<

n data bytes

AP

>

S slave address R A data A data A P

S = Start condition

A = Acknowledge

< n data >

bytes

R/W = read/write

last data byte

A = Not acknowledge P = Stop condition

Master

transmitter

Slave

SDA

receiver

SCL

receiver

SDA

transmitter

SCL

The master always sends the clock

Share Link: