Z8FS040 Datasheet, PDF (26/56 Pages) Zilog, Inc. – ZMOTION Detection and Control Family Featuring Zilog’s PIR Technology

ZMOTION^TM Detection and Control Family
Product Specification
PIR Status/Control Register 0 (ePIR_SC0)
Bit
7
6
5
4
3
Field
Control
Extended Detection
R/W
Engine
Disabled
R
MD
Suspend
R/W
Motion
Direction
Control
R/W
Address
102H
2
Motion
Direction
R
1
Motion
Detected
R/W
0
PIR
Stable
R
Extended Detection Level (Bit 6-7)
Sets the sensitivity level of extended detector
Controlled by application
These 2 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 once ‘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 effects 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 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 re-enabled. In order 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
PS028506-1110
PRELIMINARY
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