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_Debug_1

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)
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2 Comments »

  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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