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ADXL193 Self Test

Question asked by bmalone on Jul 18, 2016
Latest reply on Jul 21, 2016 by bmalone

The data sheet for the ADXL193 describes the self test function: "Activating self-test causes a step function force to be applied to the sensor, while the capacitive coupling term is canceled. The ADXL193 has improved self-test functionality, including excellent transient response and high speed switching capability. Arbitrary force waveforms can be applied to the sensor by modulating the self-test input, such as test signals to measure the system frequency response, or even crash signals to verify algorithms within the limits of the self-test swing." Am I understanding this properly that a known input signal can be applied to the ST pin and the accelerometer's actual response that would be proportional to a real-world acceleration will be output? The existing circuit has this pin connected to a MPU port that is not used. I would like to inquiry our EEs to consider using the ST if operates in the mode I am interpreting. We are using the AD 22282 version. Thanks!