Z8FS021 Datasheet, PDF (36/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
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PIR Stable (Bit 0)
Passive Infrared (PIR) sensor signal stabilized bit; controlled by the PIR Engine.
After periods of non-use, the PIR sensor will take some time to stabilize before it can be used reliably.
The amount of time is dependent on the PIR Sensor being used as well as environmental conditions; it
can range from a few seconds to as much as one minute. To relieve the application software from
having to assume a worst-case stabilization time, the PIR Engine automatically monitors the DC offset
of the PIR sensor and sets this bit when it determines that it has become stable. This bit indicates that
the PIR sensor has stabilized after one of the following conditions:
• After initial power on (cold start).
• After re-enabling the Engine via PIR Enable Register.
• After returning from sleep mode.
0 = PIR sensor signal is not stable; motion detected events are not valid.
1 = PIR sensor signal is stable; motion detected events are valid.
PS028806-0315
Standard API Register Set