Propox CY8C21 Series, Руководство пользователя, Страница: 10 / 18

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Relay
Access to the relay circuitry consist of the REL pin of the MISC header and pins: NC,NO,COM of the
relay header. REL pin is indirectly connected to the base of the transistor. Logic level 0 applied to the
REL pin, will activate the relay. External circuits can be controlled via NC, NO, COM I/O pins.
Figure 7. Relay Implementation
Buzzer
The board has an acoustic indicator turned on and off by the transistor. The base of the transistor is
connected to the SPK pin of the MISC header. Logic level `0` applied to the
SPK pin, will activate the
speaker.
Figure 8. Buzzer Impedance