Z8FS040 datasheet(38/56 Pages) ZILOG

38 / 56 page

ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

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

PIR Debounce Batch Size Register (ePIR_Debounce_Batch)

Bit

Field

PIR Debounce Batch Size

Control

Read/Write

Address

F7H

Debounce Batch Size (Bits 0-7)

Controlled by 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.

PIR Transient Sensitivity Level (ePIR_Transient_Sense)

Bit

Field

Reserved

PIR Transient Sensitivity

Control

Read/Write

Address

F8H

Transient Sensitivity (Bits 0-6)

Controlled by application

This register determines how sensitive the transient detection part of the engine is to sudden changes in

the PIR signal. A lower number makes the engine more sensitive, at the cost of potential rejection of

large signal motion (ex. warm target very close to detector).

The valid range is 0 (disabled) to 64h.

PIR Noise Sensitivity Level (ePIR_Noise_Sense)

Bit

Field

Reserved

PIR Noise Sensitivity

Control

Read/Write

Address

F9H

Noise Sensitivity (Bits 0-6)

Controlled by application

This register determines how sensitive the noise detection part of the engine is to random noise in the

PIR signal. A lower number makes the noise detector more sensitive, at the cost of potential rejection of

small-signal motion (ex. Small delta between ambient and target temperature or distant target). The

valid range is 0 (disabled) to a maximum value determined by the Window Size selected in the PIR

Advanced Status/Control Register 2.

Window Size

Max PIR Noise Sensitivity Value

Typical Value

Small

0Ch

08h

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