In-sensor shock intensity estimation

A system, comprising:

• a sensor, comprising:
• a machine learning core configured to continuously calculate an acceleration norm value based on a change in velocity along one or more axes from an accelerometer, and
• a finite state machine circuit configured to:
• compare the continuously calculated acceleration norm value to a first threshold value and, in response to the continuously calculated acceleration norm value being greater than the first threshold value, generate a first interrupt signal, and
• compare the continuously calculated acceleration norm value to a second threshold value less than the first threshold value and, in response to the continuously calculated acceleration norm value being less than or equal to the second threshold value after the first interrupt signal is generated, generate a second interrupt signal,
• wherein the machine learning core is further configured to calculate a maximum acceleration norm value between the first interrupt signal and the second interrupt signal and store the maximum acceleration norm value in a register, and
• wherein the maximum acceleration norm value is reset after a delay after the second interrupt signal is generated;
• and
• an application processor coupled to the sensor, the application processor configured to read the maximum acceleration norm value after receiving the second interrupt signal from the sensor.

A method for detecting a shock event, the method comprising:

• continuously measuring, by a sensor in a host device, acceleration values along multiple directions;
• continuously calculating, by the sensor, an acceleration norm value based on the acceleration values;
• comparing, by the sensor, the continuously calculated acceleration norm value to a first threshold value and, in response to the continuously calculated acceleration norm value being greater than the first threshold value, generating a first interrupt signal;
• comparing, by the sensor, the continuously calculated acceleration norm value to a second threshold value less than the first threshold value and, in response to the continuously calculated acceleration norm value being less than or equal to the second threshold value after the first interrupt signal is generated, generating a second interrupt signal;
• calculating, by the sensor, a maximum acceleration norm value between the first interrupt signal and the second interrupt signal;
• storing the maximum acceleration norm value in a register of the sensor, wherein an application processor of the host device reads the maximum acceleration norm value after receiving the second interrupt signal from the sensor;
• and
• resetting the maximum acceleration norm value after a delay after the second interrupt signal is generated.