Z8FS021 datasheet(57/68 Pages) ZILOG

57 / 68 page

PS028806-0315

Appendix A. Example Application Schematics

ZMOTION® Intrusion Detection

Product Specification

Appendix A. Example Application Schematics

Whether you choose to employ single or dual pyro modes using 8-pin, 20-pin or 28-pin

ZMOTION Intrusion Detection packages, this appendix offers assistance toward creating

your circuit design.

Z8FS021xSB20EG (8-Pin Device)

Figure 7 shows an example circuit for the 8-pin version of the ZMOTION Intrusion

Detection MCU. The interface to the pyroelectric sensor is via the dedicated input ANA2

(Pin 5).

The status LED is driven by Pin 6, which is normally configured as a GPIO by the applica-

tion to control the state of the LED. When White Light Detection is enabled, the PIR

Engine automatically reconfigures this pin to an ADC input to perform the necessary ADC

conversion and returns it to a GPIO when conversion is complete.

Pin 2 is used as the debug input to the chip, but can be used for other functions as required.

Pin 4 is set up for the Reset function, but can also be used for other functions as the appli-

cation requires. Pull-up resistors (10KΩ) are provided on the Debug and Reset signals as

required for the Debug interface.

The signals on pins 3 and 7 can be used as required by the application. The power supply

design remains available to application requirements.

In Dual Pyro mode, the second Pyroelectric sensor is connected to Pin 3 (ANA3). All

other connections remain the same.

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