Z8FS021 Datasheet, PDF (37/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
29
Bit
Field
Control
Address
7
Engine
Timer Tick
R/W
Table 9. PIR Status/Control Register 1
(ePIR_SC1)
6
5
4
3
2
1
0
Frequency Response
PIR Scan 2-Pulse Dual Pyro
Rate
Mode Enable
Read/Write
R/W
R/W
R/W
103H
Engine Timer Tick (Bit 7)
PIR One-Second Timer Tick
Set by the application; cleared by the PIR Engine.
• This bit must be set to 1 one time per second by the user application to provide the Engine with a one-
second tick to perform housekeeping operations relating to motion detection. The Engine will
routinely poll this bit to obtain a one-second tick. This bit is cleared by the Engine.
0 = Cleared by the PIR Engine.
1 = A one-second interval has occurred.
Frequency Response (Bits 6–3)
Frequency Response of PIR Engine; controlled by application
• This value determines the frequency response of the motion detection system. Higher values allow
lower frequencies to beaccepted by the PIR Engine. Lower values cause theEngine to ignore targets
that generate lower frequencies. These targets typically include horizontally oriented objects such as
pets.
• The frequency of the signal that is presented to the PIR Engine is largely dependent on the structure
of the PIR lens being used (number and dispersion of beams). A lens with several evenly distributed
beams provides better frequency response performance than a lens with an uneven beam
distribution.
Note: Lower programmed values also have the effect of reducing the relative range of detection. The
valid range is 0 (disabled) to a maximum value determined by the Window Size selected in the PIR
Advanced Status/Control Register 2.
The maximum Frequency Response values for each window size can be summarized as:
Window Size
Small
Medium
Large
Max Frequency Response Value
Fh
Fh
Ch
PS028806-0315
Standard API Register Set