Embedded Freaks..

November 14, 2009

Tracing I2C Communication Direction

Filed under: embedded-tips — Tags: — kunilkuda @ 8:13 am

Sometimes, the most difficult part when dealing with I2C is to differentiate the communication direction: which signal is sent to which device. Hence, this simple trick should be useful.


I2C Debugging Trick

Things to notice is that:

  • It only works for two devices debugging
  • The hump that is caused by the resistor should not exceed the threshold of maximum VInput (ie not exceeding 0.3V for CMOS device or 0.7V for TTL device)


  1. Found your pages on the TS-72xx. Good stuff – just starting playing with that myself 🙂

    Comment by RF — November 14, 2009 @ 7:05 pm

  2. Thanks

    Comment by kunilkuda — November 15, 2009 @ 12:24 pm

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