Answer / shivakumar

CAN is the best protocol.

Answer / shivakumar

Controller Area Network (CAN) is the best protocol.

Answer / sudheer thota

Depends on your requirement :)-

we can separate them based on Clock in the following way.
1) I2C & SPI are Synchronous Interfaces & used on PCB
2) CAN is Asyncronus Interface & uses wires for long
distence communications.

Diff B/W I2C & SPI:
1) a)I2C is invented by Philips
b)Invented by Mototola

2) a) Used to interface with Audio/Video Devices as the
philips is expertise.
b) Access High Data trnsmission deives like EEPROMS

3) a) I2C Supports Speed is :100Kbps(Standard)
:400Kbps(Fast)
:3.4Mbps(High Speed)
b) SPI Supports : 3Mbps to 10Mbps

4) a) I2C is multi-master, Address based Communication
b) SPI is Master Slave, With Slave select(SS) based
Communication

5) a) I2C needs 2 pins
b) SPI needs 3+n pins (n is no.of devices)

6) a) I2C supports 127 devices
b) limited by avilable Chip slects

Coming To CAN:

invented by Robert Bosh

supports 127 devices , multimaster , Message based
comminications, Reliable, supports 40kbps to 1Mbps

Answer / smarty

Sudheer has given good explaination,just to add on it :-
1)I2C is half duplex as there are only two lines(SCL and
SDA).
2)SPI is Full Duplex as between a Master and a dedicated
slave as selected by slave_select signal; there are 4 lines
(Spi_clk,Spi_datain,Spi_dataout and slave_select).So,at any
given time data can be sent and received by the master on
two seperate lines.

Answer / sudheer thota

yes, still to support my answer.

I2C supports 127(2pow7 - 1) devices in which 16 address are
reserved(8 with 1 and other 8 with 0 mbs).

Hope this calrify the above confusion.

Answer / sachin

Answer posted by Sudheer is very good and useful but small
correction
I2C supports maz 112 devices and not 127 devices

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