Timeline for What happens if I omit the pullup resistors on I2C lines?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 13, 2014 at 4:16 | comment | added | Passerby | @Ricardo yep, seeing those, at 33khz. A third of the lowest i2c spec'ed speed, and the signal is still very bad. At 100khz or 400khz, you wouldn't have working communication. Great thing though, is many i2c devices work at a fraction of the max speeds. Just remember, the internal pullups can be up to 70k ohm, a typical i2c resistor is 4.7k | |
| Mar 12, 2014 at 22:30 | comment | added | Ricardo | Just so you know I've added a few scope shots to help clarify what's going on with my setup. | |
| Mar 12, 2014 at 4:49 | comment | added | Ricardo |
+1 - You do have pull-ups, just not ones you expected. - I guess you nailed it. Thanks!
|
|
| Mar 12, 2014 at 4:43 | history | answered | Passerby | CC BY-SA 3.0 |