| 摘要 |
A piezoelectric sensor with configurable sensitivity thresholds in response to at least one sensitivity threshold command received from a host (28) over a serial data bus (27). The piezoelectric sensor (2) is improved by configuring its microcontroller (26) such that
after receiving the sensitivity threshold command, to continue using the at least one actual sensitivity threshold until the sensitivity threshold command has been completely processed and the sensitivity threshold register (30) has been updated by the microcontroller (26), and then to swap to using the updated sensitivity threshold register with the adjusted sensitivity thresholds, andafter receiving the sensitivity threshold command, to discard any signals from all piezoelectric sensor elements (20) or at least from such piezoelectric sensor elements (20), to the sensitivity threshold of which the sensitivity threshold command relates, until the microcontroller (26) has completely processed the sensitivity threshold command and updated the sensitivity threshold register (30). |
| 主权项 |
1. A piezoelectric sensor (2), comprising:
at least one piezoelectric sensor element (20) having at least two terminals (CON2-1, CON2-2); and a microcontroller (26) electrically connected to said at least one piezoelectric sensor element (20) and configured to read a signal (PZF1-VREF) indicative of the voltage (PZCOM-PZ1) between the at least two terminals (CON2-1, CON2-2), and to output at least one output signal (INTERRUPT, BUZZER, DRVEN1, HVEN, LED1, LED2, LED3, DRVP, DRVN) in response to the signal (PZF1-VREF) read, indicating that the piezoelectric sensor element (20) is being pressed or has been pressed by a finger;and wherein:
the microcontroller (26) comprises at least one two- or more dimensional sensitivity threshold register (30) containing at least one sensitivity threshold; the microcontroller (26) is configured to evaluate the signal (PZF1-VREF) indicative of the voltage (PZCOM-PZ1) depending on the sensitivity threshold, in consequence of which a sensitivity of the piezoelectric sensor (20) is defined;and wherein: the microcontroller (26) is configured, in response to receiving at least one sensitivity threshold command from a host (28) over a serial data bus (27), to set or to adjust the sensitivity threshold in the sensitivity threshold register (30), whereby the microcontroller (26) is adapted:
i) after receiving the sensitivity threshold command, to continue using the at least one actual sensitivity threshold until the sensitivity threshold command has been completely processed and the sensitivity threshold register (30) has been updated by the microcontroller (26), and then to swap to using the updated sensitivity threshold register with the adjusted sensitivity thresholds; or: ii) after receiving the sensitivity threshold command, to discard any signals from all piezoelectric sensor elements (20) or at least from such piezoelectric sensor elements (20), to the sensitivity threshold of which the sensitivity threshold command relates, until the microcontroller (26) has completely processed the sensitivity threshold command and updated the sensitivity threshold register (30). |
