Jan 20, 2011 #1 A agg_mayur Member level 3 Joined Feb 25, 2010 Messages 66 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,288 Location India Activity points 1,715 Hi All, Please tell me what will be the frequency of SPI devices and I2C devices? And what will be the max. & min. frequency for the same.
Hi All, Please tell me what will be the frequency of SPI devices and I2C devices? And what will be the max. & min. frequency for the same.
Jan 20, 2011 #2 B btbass Advanced Member level 5 Joined Jul 20, 2001 Messages 1,896 Helped 438 Reputation 880 Reaction score 288 Trophy points 1,363 Location Oberon Activity points 12,887 I2C common speeds are 100KHz and 400KHz. For SPI, you need to look at the data sheet of the device. I have seen SPI devices that clock at 10MHz.
I2C common speeds are 100KHz and 400KHz. For SPI, you need to look at the data sheet of the device. I have seen SPI devices that clock at 10MHz.
Jan 21, 2011 #3 R RCinFLA Advanced Member level 2 Joined Aug 31, 2010 Messages 605 Helped 187 Reputation 378 Reaction score 190 Trophy points 1,323 Activity points 5,795 SPI can be anything up to the limit of particular IC capability. Typical max is 10 to 30 MHz.
Jan 21, 2011 #4 A agg_mayur Member level 3 Joined Feb 25, 2010 Messages 66 Helped 3 Reputation 6 Reaction score 3 Trophy points 1,288 Location India Activity points 1,715 My controller is running on frequency of 40MHz. Than what will be the speed of SPI? Is there any formula to calculate the frequency of SPI?
My controller is running on frequency of 40MHz. Than what will be the speed of SPI? Is there any formula to calculate the frequency of SPI?
Jan 21, 2011 #5 ckshivaram Advanced Member level 6 Joined Apr 21, 2008 Messages 5,060 Helped 2,150 Reputation 4,306 Reaction score 2,088 Trophy points 1,393 Location villingen (Germany) / Bangalore Activity points 30,086 usially data sheet of controller specifies the usually 1/4th of clock is recommended but maximum frequency of SPI can support to about 40MHz
usially data sheet of controller specifies the usually 1/4th of clock is recommended but maximum frequency of SPI can support to about 40MHz
Jan 28, 2011 #6 G gajendra_808 Member level 1 Joined Oct 19, 2010 Messages 34 Helped 2 Reputation 4 Reaction score 2 Trophy points 1,288 Location ahmedabad/gujarat Activity points 1,458 the frequency of SPI devices is up to 10 mhz and for i2c 100 khz to 400 khz.