Z8FS021 Datasheet, PDF (39/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
31
Dual Pyro Mode (Bit 0)
Dual Pyroelectric Sensor Signaling Mode; controlled by the application.
• This bit determines if the PIR Engine should accept signals from one or two pyroelectric sensors.
• When configured for single pyro operation, only one sensor is used (connected to ANA2). When
configured for dual pyro operation, the Engine will scan two sensors simultaneously. Dual pyro mode
is typically used to provide a larger area of coverage. The second pyroelectric sensor is connected to
input ANA3. In Dual Pyro Mode, motion on either sensor will generate a motion detected event.
0 = Single pyroelectric sensor mode.
1 = Dual pyroelectric sensor mode.
Bit
7
Field
Control
Address
Table 10. PIR Status/Control Register 2
(ePIR_SC2)
6
5
4
3
White Light Threshold
Read/Write
104H
2
1
0
Range Control
Read/Write
Bits 7–3 reserved
White Light Detection Threshold*
Controlled by application
• These bits determine how sensitive the White light detector is to changes in detected white light. Larger
values cause the white light detector to be less sensitive. A value of 00000 disables White Light
Detection. The light is sensed via the LED connected to the ANA1 pin. Light shining on the LED creates
a small current that can generate enough voltage on the pin to measure changes accurately. The PIR
Engine automatically configures the ADC to single-ended buffered mode and performs the necessary
conversions and processing. See the White Light Detection section on page 19 for a description of White
Light operation.
Note: *This register is ignored in Low Power Mode; White Light Detection is disabled by Lower Power Mode.
Range Control (Bits 2–0)
Motion Detection Range Control; controlled by the application.
• These bits determine the relative range of motion detection; larger values decrease the range of
detection. This parameter acts as a motion signal amplitude check. A smaller range value means that a
valid motion signal’s amplitude can be lower. A larger range value means that a valid motion signal’s
amplitude must be higher.
• Typical values used for range control are dependent on the lens and pyroelectric sensor being used.
Range is also dependent on target size, speed and relative temperature. For example, a range control
setting that rejects one target of a particular size at a given distance does not guarantee that a larger
target will be rejected at the same distance.
PS028806-0315
Standard API Register Set