When Do I Need to Add Pullup Resistors to Improve I2C Bus Tolerance?
Summary
For my setup, the internal pull-ups of the Aardvark I2C/SPI Host Adapter will be disabled and 2.2k pull-ups will be connected from the SCL and SDA lines to a 2.7V voltage source. Operating with signal levels outside of that range would not work with the Aardvark adapter, and could possibly void the warranty should any damage occur. Stronger pull-up resistors and larger sink currents may be required for fast bitrates, especially if there is a large amount of capacitance on the bus. Here are the basic features of the Promira Serial Platform: • High-speed USB connectivity to the host system for high performance support for benchtop programming, testing, and emulation Here is a visual summary of all the features, as well as a quick overview of other Total Phase devices for working with I2C and SPI protocols: For an Introduction to using the Promira Serial Platform, take a look at this video: We hope this answers your questions. Additional resources that you may find helpful include the following: If you want more information, feel free to contact us with your questions, or request a demo that applies to your application.
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