Z8FS021 datasheet(39/68 Pages) ZILOG

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PS028806-0315

Standard API Register Set

ZMOTION® Intrusion Detection

Product Specification

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 pyrooperation, the Engine willscan 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.

Table 10. PIR Status/Control Register 2

(ePIR_SC2)

Bit

76543210

Field

White Light Threshold

Range Control

Control

Read/Write

Address

104H

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 theWhite Light Detection section on page 19 for adescription 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.

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