Z8FS021 datasheet(46/68 Pages) ZILOG

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PS028806-0315

Advanced API Register Set

ZMOTION® Intrusion Detection

Product Specification

Use the following equation to determine the White Light scan rate, in seconds:

Larger values create a slower sample rate, which results in slower White Light response.

Smaller numbers will increase White Light event response at the cost of potentially

degrading motion detection.

EM Transient Detected (Bit 0)

EM Transient Detected on PIR Signal; set by the PIR Engine; cleared by the application.

• This bit indicates if the Engine has detected a transient on the PIR signal. This event is provided to

the user application to indicate that an EM transient event has occurred and associated motion

event(s) may have been suppressed by the Engine. This bit is does not have to be read for normal

operation and is provided as status only. The application must clear this bit after it has been read.

Table 18. PIR Advanced Status/Control Register 1

(ePIR_ASC1)

Bit

76543210

Field

White Light Debounce

White Light Scan Rate

Control

R/W

Address

F1H

White Light Debounce (Bits 7–4)

White light debounce time; controlled by the application.

• This value determines the amount of debounce applied to the White Light detection. White Light

Debounce is the number of sequential WL samples above the threshold value set in the PIR Status/

Control Register 2 required to consider it as a WL event. Larger numbers result in more stable White

Light detection at the cost of slower White Light response.

0 = Internal VREF selected.

1 = External VREF selected.

White Light Scan Rate (Bits 3–0)

White light (LED) scan rate; controlled by the application – see the equation that follows.

• This value determines the rate (in seconds) at which the White Light signal is sampled. WL scan is

performed at a maximum rate of once every 5 PIR constructed samples when this value is set to 0.

The PIR constructed sample time is determined by thePIR Sample Size Register. Each increment of

1 to the White Light Scan Rate value adds 5 constructed samples to the time between White Light

scans.

 



Frequency

Clock

System

Rate

Scan

Light

White

Size

Sample

ePIR

4873

1280



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