Z8FS021 datasheet(37/68 Pages) ZILOG

37 / 68 page

PS028806-0315

Standard API Register Set

ZMOTION® Intrusion Detection

Product Specification

Table 9. PIR Status/Control Register 1

(ePIR_SC1)

Bit

76543210

Field

Engine

Timer Tick

Frequency Response

PIR Scan

Rate

2-Pulse

Mode

Dual Pyro

Enable

Control

R/W

Read/Write

R/W

Address

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 to1 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

Max Frequency Response Value

Small

Medium

Large

Z8FS021 Datasheet(PDF) 37 Page - Zilog, Inc.

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