Z8FS021 datasheet(33/68 Pages) ZILOG

33 / 68 page

PS028806-0315

Standard API Register Set

ZMOTION® Intrusion Detection

Product Specification

Table 7. PIR Sensitivity Register

(ePIR_Sensitivity)

Bit

76543210

Field

Sensitivity

Default

UUUUUUUU

Control

Read/Write

Address

101H

Sensitivity (Bits 7)

PIR Sensitivity Setting; controlled by the application. The PIR Sensitivity Register is used to adjust the

sensitivity of the PIR Engine to target motion. Lower values produce higher sensitivity to motion, with 00h

being the most sensitive and FFh being the least sensitive. The user application should load this register

with the appropriate value to provide the appropriate sensitivity. This parameter acts as a motion signal

duration check. A smaller sensitivity value means that the duration of a valid motion signal can be shorter.

A larger sensitivity value means a valid motion signal’s duration must be longer.

Notes:

1. The setting of this register also affects the range of detection. Lower values increase range and higher values

decrease range.

2. Depending on the lens and pyroelectric sensor used, values above 3Fh can result in very limited detection.

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