Digital Memory
Non volatile memory locations within a digital sensor that hold the calibration coefficients for gain and offset allow post assembly adjustment of transducer performance. Accessing the I2C trim register lets automated calibration systems write correction parameters directly to the device during final testing.
Calibration Byte
Stored coefficients in these registers are determined by testing the sensor across its temperature and pressure limits. The factory system calculates the difference between the raw sensor readings and the actual reference values, then translates these offsets into correction bytes.
Offset Correction
During operation, the sensor’s internal processor reads these stored parameters to adjust the digital output on the fly. This real-time scaling removes errors caused by manufacturing tolerances and stress from packaging. Without these registers, the sensor would output raw uncompensated signals that do not meet accuracy requirements.
Value Retention
Ensuring the long-term integrity of the stored data is necessary to prevent sensor drift over time. Register writes are protected by checksums or cyclic redundancy checks to prevent accidental corruption from electromagnetic interference or power supply glitches. During system startup, the host microcontroller often verifies these calibration values against a saved configuration to ensure the sensor’s operational safety and reliability.
