Discussion in "General help Guidance and Discussion" started by    RUSHI D    Apr 28, 2009.
Tue Apr 28 2009, 12:13 AM
#1
hi frnz...!

can u pls list down d differences between SPI and I2C protocols...

regards
rushi d.
Tue Apr 28 2009, 01:50 AM
#2
I2C =>less no. of pins only one line for data transfer
SPI=>two lines required for data transfer
I2C is slower than SPI.
Tue Apr 28 2009, 03:14 AM
#3
thanx shyam...

but i want detailed differences like if we r compairing their speeds den mention d max speeds they can achieve

any more difference...

regards
rushi d.
Tue Apr 28 2009, 03:32 AM
#4
There are a lot of difference from the protocol point of view. But Hardware wise it same as mentioned by shyam.

1. In I2C lot of s/w manipulation has to be done. where as in SPI programmer need to handle only SS pin if SPI is used between multiple ics.

2. I2C can reach only till 384kbps based on CCLK. Whereas SPI can go till CCLK/4. i.e., if CCLK=12MHz, Then SPI speed is 3MHz.

3. There are atleast 30-40 situation which programmer is suppose to handle in I2C for effective and efficient communication. where as in SPI only SS is suppose to be managed and data is supposed to be placed in SPDAT.

4. In SPI since both the MOSI(Master Out Slave In) and MISO(Master In Slave Out) uses a single buffer care should be taken to transfer the data.

5. I2C can be used in a situation where shrinking of the pcb is more important than speed and SPI is vice-versa

 RUSHI D. like this.
Tue Apr 28 2009, 03:41 AM
#5
I2C can go upto 4Mhz SPI can go upto 70Mhz
 RUSHI D. like this.
Tue Apr 28 2009, 03:42 AM
#6
thanx ajaz 4 ur reply

but i did not get 3rd pt..

can u explain..?
Tue Apr 28 2009, 03:57 AM
#7
He mens to say that, incase of I2C programmer has to take care of right sequence of data transfer on bus like address, start, stop, ack, nak etc...
where as in case of SPI just SS (slave select) is to be managed and data read/write is done from SSPDAT register.

these names may vary from controller to controller
Tue Apr 28 2009, 08:47 AM
#8
k got it...
thanx ajay
Tue Apr 28 2009, 02:10 PM
#9
A very valuable tool to discovering what things mean and what things do is the Google search engine.

If you type into this search engine the phrase "SPI interface", your first website shown is:
http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus

This is a pretty good description of the SPI interface, and some of what it can do...

Likewise, if you type in "I2C interface", you get this website:
http://en.wikipedia.org/wiki/I%C2%B2C

Give it a try, and see for yourself...

Hope this helps,

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ajay_bhargav
Mon Jul 28 2014, 12:34 AM
@ Anshu Raj sorry we do not take such requests.
Sun Jul 27 2014, 12:23 AM
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sir plz send the automatic collage alram bells in 2 hrs bells ring. For microcontroller programme plz sir
ajay_bhargav
Thu Jul 24 2014, 01:06 AM
@R.ABHISHEK where? I dont see it. is it in forum?
Wed Jul 23 2014, 05:49 AM
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sir,pls message on microcontroller 8051 assambly language new program
Wed Jul 23 2014, 05:47 AM
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sir,pls message on 8051 microcontroller assambly language program new quastions
ajay_bhargav
Tue Jul 22 2014, 09:18 AM
@Pragya Android application is taken from google play. Only Author has its source with him. Application is only used in this project.
Tue Jul 22 2014, 04:58 AM
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plz send me 8051 code and android code for android based device controller via Bluetooth .Here in this project I am using Hc-06 Bluetooth module
Thu Jul 10 2014, 09:57 AM
Caleb
plz someone mail me the source code for that project
Thu Jul 10 2014, 09:57 AM
Caleb
http://www.8051projects.net/download-d188-control-your-pc-tv-remote.html
ExperimenterUK
Tue Jul 08 2014, 03:25 PM
Post questions in the forum.. this area is for chat

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