Z8FS021 Datasheet, PDF (34/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
26
Bit
Field
Control
Address
Table 8. PIR Status/Control Register 0
(ePIR_SC0)
7
6
Extended Detection
R/W
5
Engine
Disabled
R
4
3
MD
Suspend
Motion
Direction
Control
R/W
R/W
102H
2
Motion
Direction
R
1
0
Motion
Detected
PIR Stable
R/W
R
Extended Detection Level (Bits 7–6)
Sets the sensitivity level of the extended detector; controlled by the application.
• These two bits enhance the motion detection algorithms to detect slower, faster and/or more subtle
motion. The Extended Detection level is selected to provide a balance between additional sensitivity
while maintaining stability (no false detections). In certain applications such as lighting control, the
Extended Detection level can be increased when normal motion has been detected. Extended
detection is dependent on the lens pattern used. Smaller lens beams tend to provide more subtle
motion detection.
• The Extended Detection level affects user control over the range provided in ePIR_SC2. As the
Extended Detection level is increased, the Range setting becomes less effective.
00 = Extended Detection Level 0 – Minimum (least sensitive).
01 = Extended Detection Level 1.
10 = Extended Detection Level 2.
11 = Extended Detection Level 3 – High (most sensitive).
Engine Disabled (Bit 5)
PIR Engine Disable/Suspend Acknowledged; controlled by the PIR Engine.
• This bit indicates the operational status of and is controlled by the PIR Engine. When the Engine is
initialized and enabled by loading the PIR Enable Register with the ePIR_ENABLE_PATTERN value,
this bit is cleared to indicate that the Engine is ready. When the Engine is disabled by loading the PIR
Enable Register with the ePIR_DISABLE_PATTERN, it will respond by setting this bit to 1 and
perform no further operations until reenabled. For the Engine to detect that it has been disabled, the
user must allow the Engine ADC interrupt to run at least once after loading the PIR Enable Register
with the ePIR_DISABLE_PATTERN.
0 = Engine is enabled and operational.
1 = Engine is disabled and not operational.
PS028806-0315
Standard API Register Set