Z8FS021 datasheet(34/68 Pages) ZILOG

34 / 68 page

PS028806-0315

Standard API Register Set

ZMOTION® Intrusion Detection

Product Specification

Table 8. PIR Status/Control Register 0

(ePIR_SC0)

Bit

76543210

Field

Extended Detection

Engine

Disabled

Suspend

Motion

Direction

Control

Motion

Direction

Motion

Detected PIR Stable

Control

R/W

Address

102H

Extended Detection Level (Bits 7–6)

Sets the sensitivity level of the extended detector; controlled by the application.

• These two bits enhance the motion detection algorithms to detect slower, faster and/or more subtle

motion. The Extended Detection level is selected to provide a balance between additional sensitivity

while maintaining stability (no false detections). In certain applications such as lighting control, the

Extended Detection level can be increased when normal motion has been detected. Extended

detection is dependent on the lens pattern used. Smaller lens beams tend to provide more subtle

motion detection.

• The Extended Detection level affects user control over the range provided in ePIR_SC2. As the

Extended Detection level is increased, the Range setting becomes less effective.

00 = Extended Detection Level 0 – Minimum (least sensitive).

01 = Extended Detection Level 1.

10 = Extended Detection Level 2.

11 = Extended Detection Level 3 – High (most sensitive).

Engine Disabled (Bit 5)

PIR Engine Disable/Suspend Acknowledged; controlled by the PIR Engine.

• This bit indicates the operational status of and is controlled by the PIR Engine. When the Engine is

initialized and enabled by loading the PIR Enable Register with the ePIR_ENABLE_PATTERN value,

this bit is cleared to indicate thatthe Engine is ready. When the Engine is disabled by loading the PIR

Enable Register with the ePIR_DISABLE_PATTERN, it will respond by setting this bit to 1 and

perform no further operations until reenabled. For the Engine to detect that it has been disabled, the

user must allow the Engine ADC interrupt to run at least once after loading the PIR Enable Register

with the ePIR_DISABLE_PATTERN.

0 = Engine is enabled and operational.

1 = Engine is disabled and not operational.

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