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Andy Peters
11/04/11 13:13
Read: 443 times
Tucson, Az

#184544 - 3.4 MHz I2C
Responding to: ???'s previous message
John M said:
Ahh, got it. Kind of new to uC programming, but I'm very familiar with I2C and not so much SPI. I thought I just wasn't searching correctly for the high speed I2C, but it looks like nothing feasible exists.

Will look into SPI. Thanks.

As Erik says, the fast SiLabs 8051s can do 3.4 MHz I2C. The I2C timing in those parts is set by a couple of registers, so there's no reason why you couldn't tweak it for the higher frequency operation. I haven't done it, because I don't have any I2C slaves that run that fast.

SPI is simpler, in that you don't have to manage bus states (START, STOP, etc) but it's more than two wires. And it can go MUCH faster than I2C.


List of 13 messages in thread
Looking for 8051 that supports high speed I2C      John M      11/02/11 15:22      
   SPI      Per Westermark      11/02/11 16:06      
      gotcha      John M      11/02/11 21:03      
         3.4 MHz I2C      Andy Peters      11/04/11 13:13      
            RE: SPI is simpler      Andy Neil      11/04/11 14:03      
               One other quick question for all you smart people.      John M      11/07/11 20:24      
                  Some things to consider....      Michael Karas      11/08/11 05:11      
                     Full range and clipping      Per Westermark      11/08/11 05:24      
                        Impedance      John M      11/08/11 06:04      
                           You sure?      Per Westermark      11/08/11 06:18      
                           Impedance With Divider      Michael Karas      11/08/11 09:00      
                           Impedance matching      Andy Neil      11/08/11 15:54      
   if I recall      Erik Malund      11/03/11 07:13      

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