Z8FS021 datasheet(44/68 Pages) ZILOG

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PS028806-0315

Advanced API Register Set

ZMOTION® Intrusion Detection

Product Specification

Table 17. PIR Advanced Status/Control Register 0

(ePIR_ASC0)

Bit

76543210

Field

External

VREF

White

Light

Detected

White

Light

Anti-Jam

Buffer

Refresh

New

Sample

Origin

EM Noise

Detected

Transient

Detected

Control

R/W

Address

F0H

External VREF (Bit 7)

Select between internal or external VREF; controlled by the application.

• This bit selects between internal and external VREF for the ADC when scanning the PIR sensor. When

set to 0, internal VREF is used and it is automatically set to 1V when the PIR Engine is initialized via

the EPIR_INIT macro. When set to a 1, external VREF is selected and a regulated 1V signal must be

supplied to this pin by the user. The advantage of using an external VREF is that it is affected lessby

internal operations of the MCU like high drive on an output pin.

0 = Internal VREF selected.

1 = External VREF selected.

Note: This register affects the VREF selection for ADC scans of the PIR sensor only. ADC channel scan requests

made through ePIR SC3 always use an internal 2V reference.

White Light Detected (Bit 6)

White Light Detected on LED; cleared by the application.

• This bit is set by the PIR Engine when a White Light event has been detected. This status is provided

to the user application to indicate that a White Light event has occurred and associated false motion

event(s) may have been suppressed by the Engine. This bit is set by the Engine and must becleared

by the user application. The threshold or amount of light required to trigger a White Light event is

controlled by the White Light Threshold bits in PIR Status/Control Register 2.

• If White Light detection is disabled (White Light Threshold=00000), this bit is undefined and should

be ignored by the user application.

White Light Anti-Jam (Bit 5)

Stop malicious jamming of the detector via continuous white light events; controlled by the application.

• White Light Anti-Jam is used to prevent a repetitive white light signal from jamming motion detection.

Without Anti-Jam a constant source of white light events can indefinitely inhibit motion detection. With

Anti-Jam enabled, after 12 White Light events within a short duration, the Engine will begin to ignore

them and return to regular motion detection. After a period of no White Light events, the Engine will

begin looking for White Light events again. The feature is intended to prevent malicious jamming of

the detector.

0 = White Light Anti-Jam disabled.

1 = White Light Anti-Jam enabled.

Z8FS021 Datasheet(PDF) 44 Page - Zilog, Inc.

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