Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
???
12/10/10 16:49
Read: times


 		 #180063 - Setup and hold
Responding to: ???'s previous message
The chips are about 1cm apart on a 4 layer PCB with a ground plane, which should give a good ground.
SCL is top yellow trace, SDA is bottom blue trace, and the EEPROM calls for 0 nsec of hold after SCL goes low. If this is a problem then I don't know what to do about it. The documentation describes the existence of a register that, to quote:
I2CxCCNT are 8-bit start/stop generation counters. They hold off SDA low for start and stop conditions.
There is no description of what values to use, and experimenting with different values does not seem to make any difference.

List of 36 messages in thread
TopicAuthorDate
Aaargh, it only works with the monitor connected            01/01/70 00:00      
   Scope            01/01/70 00:00      
      No obvious difference            01/01/70 00:00      
         May not help            01/01/70 00:00      
         Just a thought....            01/01/70 00:00      
   ground            01/01/70 00:00      
      Setup and hold            01/01/70 00:00      
         0ns hold is allowed indeed...            01/01/70 00:00      
            Bus Speed?            01/01/70 00:00      
               Reply to all            01/01/70 00:00      
                  Add capacitance :-|(            01/01/70 00:00      
                     Other options?            01/01/70 00:00      
                        Chip Types and Connections            01/01/70 00:00      
                           chip type            01/01/70 00:00      
                           ADuC7026 and 24LC16            01/01/70 00:00      
                              If serial EEPROM not in critical path...            01/01/70 00:00      
                                 Another thing...            01/01/70 00:00      
                                    that is ridiculous!!!            01/01/70 00:00      
                                       I know...            01/01/70 00:00      
                                       Ridiculous - but not unique, I'm afraid            01/01/70 00:00      
                                          Fully licensed interface            01/01/70 00:00      
                                             Stop Timing?            01/01/70 00:00      
                                                If I could figure out how            01/01/70 00:00      
                     Resolved? 39pF added to SDA            01/01/70 00:00      
                        NOw..ok            01/01/70 00:00      
                           Chewing gum            01/01/70 00:00      
                              Agreed            01/01/70 00:00      
                           Where?            01/01/70 00:00      
                        points            01/01/70 00:00      
                           "Features of a 51"...            01/01/70 00:00      
         do You have            01/01/70 00:00      
         to long track of SDA and SCL            01/01/70 00:00      
            huh?            01/01/70 00:00      
               the cable also            01/01/70 00:00      
                  re: the cab;e            01/01/70 00:00      
                     Capacitance slows flanks - but slow flanks needs hysterese            01/01/70 00:00      

Back to Subject List