| 摘要 |
A sensor system (200) including magnetic sensing elements (210) and circuitry configured to detect the presence or absence of an article, such as a gear tooth (115), in a first mode, and to determine timing accuracy in a second mode. Control circuitry (230) is provided for controlling the switching circuitry (220) to switch between modes in a predetermined manner and at predetermined times dependent upon the voltages and magnetic fields. The magnetic sensing elements (210) as well as the switching circuitry (220), interface circuitry and the control circuitry (230) are preferably integrated onto a single silicon chip to yield an efficient and reliable sensor system (200). Upon power on, the sensor system (200) is configured in the first mode to determine the presence or absence of the article next to the sensor (210). After a number of transitions of the hall voltage, e.g., indicating a predetermined number of gear teeth (115) have passed the sensor(210), the sensor system (200) is switched to the second mode, and the sensor system (200) operates in a dynamic time continuous manner to determine speed and timing parameters.
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