ZDP323B Series Digital PIR Sensor

Product Specification

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PS041703-0324 - Preliminary

Page 3

Peak values from the output of the bandpass filter are saved in the Peak Hold register and

can be read over the I2C interface. This is useful for development when selecting the best

filter profile for the application requirements and specific lens being used.

If Trigger Output mode is enabled, the output of the digital band pass filter is passed to a

digital window comparator with programmable thresholds. When the signal exceeds the

selected window threshold, the detection counter is incremented. If the signal still exceeds

½ the selected threshold when the next ADC sample is processed, the detection counter is

incremented again, and the Trigger Output (TRIG pin) is driven active for 50µs indicating

that a motion event has been detected. When multiple devices are on the same I2C bus, the

Peak Hold value is read to determine which device asserted its Trigger Output.

4 Pin Descriptions

1

2

3

4

Bottom View

5 Field of View

The typical Field of View (FOV) of the ZDP323B series Digital PIR Sensor is 148

 in the X

axis and 136

 in the Y axis as shown in the following figure.

Figure 3 - Field of View

Table 2 - Pin Descriptions

Pin

Name

Description

1

SDA/TRIG

SDA: I2C Serial Data

Transfers data to/from external I2C

master.

TRIG: Motion Trigger

Driven low when motion detected

2

VDD

Power Supply

3

SCL

I2C Serial Clock

Serial clock input from extern I2C

master

4

GND

Ground - Case

Figure 2 - Bottom View Pin Out