ZDP323B Series Digital PIR Sensor

Product Specification

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PS041703-0324 - Preliminary

Page 2

2 Ordering Information

There are four variations of the ZDP323B series Digital PIR Sensor available, differentiated

by their I2C bus address. All other performance, functions and features remain the same. All

devices will also respond to an I2C General Call transaction.

Table 1 - Ordering Information

Part Number

Description

I2C Bus Address

ZDP323B1

Digital PIR Sensor; Dual Element, I2C Bus

301h

ZDP323B2

Digital PIR Sensor; Dual Element, I2C Bus

302h

ZDP323B3

Digital PIR Sensor; Dual Element, I2C Bus

303h

ZDP323B4

Digital PIR Sensor; Dual Element, I2C Bus

304h

3 Block Diagram

The device consists of two series opposed PIR sensing elements connected to a FET

follower and all other processing required to detect motion. An I2C interface is provided for

communications. The SDA signal can be used as a Motion Trigger output to interrupt or

wake up a host processor when motion is detected.

AMP

Digital

Band

Pass

Filter

ADC

Configuration Register, Peak Hold

and

I2C Interface

VDD

GND

SDA/TRIG

SCL

Window

Comparator

Thresholds

and

Detection

Counter

Figure 1 - Block Diagram

3.1

Operation

Refer to Figure 1. An amplifier provides buffering of the PIR signal for the ADC which

performs a conversion every 9.5ms and passes the result to the digital bandpass filter. One

of several different filter profiles can be selected depending on performance requirements

and lens characteristics.