Z8FS021 datasheet(49/68 Pages) ZILOG

49 / 68 page

PS028806-0315

Advanced API Register Set

ZMOTION® Intrusion Detection

Product Specification

Table 22. PIR Debounce Timeout Register

(ePIR_Debounce)

Bit

76543210

Field

PIR Debounce Time

Control

Read/Write

Address

F6H

PIR Debounce Time (Bits 7–0)

Controlled by the application.

• This register controls the amount of time that the Engine will wait to fully debounce a motion signal.

Longer times result in detection of subtle motion at the cost of more potential false motion detections.

Valid range is from 01h to FFh.

• Using a value less than the value in the PIR Sensitivity Register will result in no motion detection.

Table 23. PIR Debounce Batch Size Register

(ePIR_Debounce_Batch)

Bit

76543210

Field

PIR Debounce Batch Size

Control

Read/Write

Address

F7H

PIR Debounce Batch Size (Bits 7–0)

Controlled by the application.

• This register determines the number of consecutive out-of-window samples required in order to

consider the sequence a valid debounce count. The field works as a mask. Increasing the mask size

(i.e. more bits set to 1) will increase the noise immunity of the Engine but result in lower sensitivity to

subtle motion signals.

• Valid values are 01h, 03h, 07h, 0Fh, 1Fh, 3Fh, 7Fh and FFh.

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