ZDP323B2 datasheet(17/26 Pages) ZILOG

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ZDP323B Series Digital PIR Sensor

Product Specification

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PS041703-0324 - Preliminary

Page 14

12.2 Multi-Device Operation

Power On

(Delay 500ms)

Yes

Write Device N Configuration Register:

• Trigger Output Mode: Disabled

• Detection Threshold = FFh

• Band-Pass Filter Step: As required

• Band-Pass Filter Type: As required

Peak Hold

½ Detection

Threshold

(7Fh)

MCU: Wait for SDA/TRIG

active

MCU: SDA signal configured as

input to interrupt or wake

Delay 10ms

N = 1

N = N + 1

N = #

Devices

Read Peak Hold Data

Yes

MCU: Wake up or

Interrupt

(SDA/TRIG Active)

Yes

Peak Hold

Detection

Threshold

N = 1

N =

# Devices

Read Device N Peak Hold Data

Yes

N = N + 1

Device N = Motion Detected

MCU: Wait TSTAB (30 Sec)

TSTAB is incurred only once after power on or

after any change is made to the Band-Pass

Filter Step or Type settings

Write Device N Configuration Register:

• Trigger Output Mode: Enabled

• Detection Threshold: As required

• Band-Pass Filter Step: As required

• Band-Pass Filter Type: As required

Write Device N Configuration Register:

• Trigger Output Mode: Disabled

• Detection Threshold: No change

• Band-Pass Filter Step: No change

• Band-Pass Filter Type: No change

Figure 16 - Multi-Device Operating Example

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