Z8FS021 datasheet(47/68 Pages) ZILOG

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PS028806-0315

Advanced API Register Set

ZMOTION® Intrusion Detection

Product Specification

Table 19. PIR Advanced Status/Control Register 2

(ePIR_ASC2)

Bit

76543210

Field

Lock Level

Window Size

Window Update Rate

Control

R/W

Address

F2H

Lock Level (Bits 7–5)

Controlled by the application.

• This parameter sets the minimum slope change in the signal that can be considered validmotion. This

prevents small signal changes caused by environmental or VCC shifts from causing a false detection.

Use this value in combination with PIR Sensitivity and Range Control settings to balance sensitivity

and stability to the particular lens and pyroelectric sensor being used.

– Smaller values allow subtle signals with lower slopes to be considered motion events at the

expense of potential false motion events.

– Larger values allow thesystem to ignore smaller signal slope changes at the expense of potentially

missing smaller motion events.

Window Size (Bits 4–3)

Controlled by the application.

• This register determines the size of the control limit window. A larger window size produces more

stable control limits at the cost of additional CPU usage. If a smaller window size is used, the more

frequently the window can be calculated which allows it to track the signal better.

00 = Reserved.

01 = Small window.

02 = Medium window.

03 = Large window.

Window Update Rate (Bits 2–0)

Controlled by the application.

• This register determines how frequently the control limits are calculated. It is measured in PIR

samples. A smaller number produces more frequent calculations which allow the control limits to track

the signal better, at the cost of increased CPU usage. The valid range is 0 to 7.

• The window is updated every 4 + (Window Update Rate * 2) PIR samples.

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