Z8FS021 Datasheet, PDF (33/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
25
Table 7. PIR Sensitivity Register
(ePIR_Sensitivity)
Bit
7
6
5
4
3
2
1
0
Field
Sensitivity
Default
U
U
U
U
U
U
U
U
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.
PS028806-0315
Standard API Register Set