On Fri, Mar 26, 2010 at 9:37 AM, m...@watty <[email protected]> wrote:
> > > On Mar 26, 4:19 pm, Joep Suijs <[email protected]> wrote: > > Hi Seb, > > > > Feel free to change the filename. I'll comply if there is a new version. > > > > Joep > on last pagish schematic, why is RB3 pulled to VDD/VCC via 47k? Unless > you want LVP? or have I got it wrong? > > Are pullups for I2C officially 4k7 or 1k5? I've been using 4k7, but > that could be my mistake. > > > Hi Mike, There isn't an "officially" pullup value for i2c bus. The value of pullup depends on bus capacitance (meaning bus lenght and configuration and number of devices on bus) and the power supply value, to met the minimum current flow for i2c standard which is 350-400uA for a bus capacitance less than 300pF. So, for a short i2c bus with one master and one slave, supplied at 3.3V the pullups may be as high as 8k2. Vasile -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
