Surface-Attached Alerting Device

摘要

A detection device includes a proximity sensing circuit that generates a chime activation signal responsive to a sensor activation signal; a loudspeaker; and a chime generator circuit coupled between the proximity sensing circuit and the loudspeaker, configured to control activation of the loudspeaker responsive to the chime activation signal. The chime generator circuit may include an in-system programming (ISP) connector having program pins adapted to receive a programming probe such that the chime generator circuit is programmable after being placed on a circuit board, the program pins including a program clock (PGC) pin. The detection device may also include a resistor connected between power supply of the chime generator circuit and the PGC pin, the resistor having a resistance such that the chime generator circuit: detects when the programming probe is attached to the PGC pin while sampling the voltage at the PGC pin, and suppresses chiming of the loudspeaker.

主权项

1. A surface-attached detection device, comprising:
a proximity sensing circuit configured to generate a chime activation signal responsive to receipt of a sensor activation signal; a loudspeaker; a chime generator circuit coupled between the proximity sensing circuit and the loudspeaker and configured to control activation of the loudspeaker responsive to the chime activation signal; the chime generator circuit including an in-system programming (ISP) connector comprising program pins adapted to receive a programming probe such that the chime generator circuit is programmable after being placed on a circuit board, the program pins including a program clock (PGC) pin; and a resistor connected between a regulated power supply of the chime generator circuit and the PGC pin, the resistor having a resistance such that the chime generator circuit detects the presence of the programming probe at the PGC pin while sampling the voltage at the PGC pin.