Z8FS021 Datasheet, PDF (50/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
42
Table 24. PIR Transient Sensitivity Level Register
(ePIR_Transient_Sense)
Bit
7
6
5
4
3
2
1
0
Field
Reserved
PIR Transient Sensitivity
Control
0
Read/Write
Address
F8H
Reserved (Bit 7)
This bit is reserved and must be 0.
Transient Sensitivity (Bits 6–0)
Controlled by the 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 (for example, a warm target very close to the detector). The valid range is 0
(disabled) to 64h.
Table 25. PIR Noise Sensitivity Level Register
(ePIR_Noise_Sense)
Bit
7
6
5
4
3
2
1
0
Field
Reserved
PIR Noise Sensitivity
Control
0
Read/Write
Address
F9H
Reserved (Bit 7)
This bit is reserved and must be 0.
Noise Sensitivity (Bits 6–0)
Controlled by the application – see Table 26 for values.
• This register determines how sensitive the noise detection part of the Engine is torandom broadband
noise in the PIR signal. A lower number makes the noise detector more sensitive at the cost of
potential rejection of small-signal motion (for example, a small delta between the ambient and target
temperatures, or a 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.
PS028806-0315
Advanced API Register Set