Z8FS021 Datasheet, PDF (57/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
49
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.
PS028806-0315
Appendix A. Example Application Schematics