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

plz send me the website of dmrc for previous questions papers

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