This fuction is used for lessening the damage to the device due to freefall. The sensor offers a 0g-Detect feature that provides a logic high signal when all three axesare at 0g. The MMA7361L includes a Sleep Mode for power saving. Zero-g offset and sensitivity are factory set and require no external devices. It has self test, and 0g-Detect which detects linear freefall. The Arduino is really good option for it. The analog output should be converted to digital value via Microcontroller. It has two stage sentivity, 1.5g (high sensitivity), 6g (low sensitivity), that can be adjusted by g-select pin. Output level of each axis is in ratio to measured acceleration that is related to g-force. It is a 3.3V part and outputs an analog voltage for each of the theree axis. It has capacitive micromachine to determine the forces according to the acceleretion. The MMA7361L is a low power nice sensor with analog interface.
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