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C4Mir is an innovative technology for mixed-signal testing and measurement for long-term sensor-based monitoring and I2C or I3C based solutions.

This technology and method of operation can be used for initialization, measurement, and resource management through mixed-signal analog bus scheduling, synchronization and group addressing for built-in calibration strategies for example.


Challenge | Opportunity

Circuits components and sensors are vulnerable to aging, usage, among other environmental and physical issues that may negatively impacts their function. Data reliability problems may arise what is particularly relevant in safety critical applications such as in medical, aerospace and automotive electronic systems.

Data reliability issues have been addressed using ad hoc strategies or a mixture of standards mostly direct to digital scenarios. However, these technical solutions do not completely solve the problem in multi-sensors applications comprising both digital and analog signals such as in wearables.

Therefore, C4Mir tackles the limitation of multiple element accessibility and controllability on traditional communication buses such as I2C, SPI, 1149.1, 1149.5, and wrapper approaches such as 1500 and P1687. Moreover, this INESC TEC’s technology allows using the widely adopted I2C bus as part of a flexible long-term solution strategies involving monitoring, self-calibration, built-in self-testing, measurements and/or group synchronization.


Main Advantages

  • I2C multiple core/instrument accessibility;
  • Synchronized access;
  • Extension to analog and/or digital elements;
  • Speeds up communication;
  • Facilitates inter-module sequential and instantaneous operations;
  • Reduced resource consumption;
  • I2C broadcast level addressability expansion.


  • Distributed sensor testing.

  • Commercial Rights

  • Development Stage

    Proof-of-Concept (TRL 2)
  • Further Information

    <p><a href="" target="_blank">US9921835 (B2)</a></p> <p><a href="" target="_blank">JP6321221 (B2)</a></p> <p><a href="" target="_blank">KR101842540 (B1)</a></p> <p><a href="" target="_blank">EP3123348 (B1)</a></p> <p><a href="" target="_blank">ES2694168 (T3</a>)</p> <p><a href="" target="_blank">CN106471483 (A)</a></p>
  • IPR Status

    Patent granted
  • Licensing Availability

  • Industrial Categories

    Information and Communication
  • Tags

    Software, Quality control, Hardware, Mixed Signal