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GA312 Pyroelectric Infrared Sensor
Category:
- Product Description
-
Features
* Digital signal processing technology is used to process pyroelectric signals.
* The differential high-input impedance input of Channel 2 serves as the sensor’s sensitive element input, offering enhanced anti-interference capability.
* Built-in digital bandpass filter effectively eliminates interference from other spurious frequencies.
* All signal processing is performed within the metal housing, providing enhanced resistance to electromagnetic interference.
* Low operating voltage, low power consumption, and fast response time.
Application
* Intelligent security protection against infrared motion intrusions and more * IoT infrared motion detection
* Automatic lighting control for stairwell lights, indoor lights, hallways, etc. * Solar-powered automatic sensor lights
* Smart home appliances such as refrigerators, air conditioners, and televisions * Occupancy detection
Scope of Use
This document is used for digital intelligent pyroelectric infrared sensor output devices.
Sensor output format
Digital TTL output
Product name and product number
Product Name
Smart Digital Pyroelectric Infrared Sensor
Item number
GA312
Appearance and Dimensions
Appearance
The surface is smooth, free of scratches, stains, rust, and other such defects.
Electrical Performance Parameters
Larger rated parameters
Any electrical stress exceeding the parameters listed in the table below could cause permanent damage to the device. Operating under these higher-rated conditions may affect the device’s reliability.
Parameter
Symbol
Smaller value
Larger value
Unit
Note
Power supply voltage
V DD
-0.3
4.5
V
Pin limits
Into
-100
100
mA
One pin at a time
Storage temperature
T st
-45
125
Celsius
Working conditions ( Ambient temperature 25 Celsius )
Parameter
Symbol
Smaller value
Typical value
Larger value
Unit
Note
Power supply voltage
V DD
2.2
3.3
4.5
V
Operating current
I DD
10
microampere
10 µA @ 3.3 V @ 25°C o C
Output REL
Output high current
I Oh
-5
mA
V OL >(V DD -1V)
Output low current
I OL
5
mA
V OL <1V
Output delay time
t REL
1
s
Internal lock
Filters and Oscillators
Low-pass filter cutoff frequency
7
H Z
High-pass filter cutoff frequency
0.4
H Z
On-chip oscillator frequency
F CLK
32
kH Z
Internal block diagram
Output REL trigger mode
When the sensor receives a valid signal—after it has been processed by a digital filter—that exceeds the internal trigger threshold, an internal counting pulse is generated. If the sensor subsequently receives another such signal, a second pulse is generated internally. If two pulses are received within 4 seconds, the REL pin will output a high-level signal. If the amplitude of the received signal exceeds the trigger threshold by more than five times, only one pulse is needed to trigger the REL pin to output a high-level signal. The delay time for the REL output starts timing from the moment of the most recent valid pulse.
Optical Performance Parameters
Window material transmittance spectrum
Spectral characteristics of the filter
External dimensions
Pin definitions
Serial number
Name
Direction
Description
1
VDD
Input
Power supply: 2.2V to 4.5V
2
REL
Output
The REL pin outputs a high level to indicate the presence of a trigger signal that meets the decision criteria. The duration of this high-level output is measured from the moment of the most recent valid trigger, with a delay starting from that point and lasting until the delay period determined by the ONTIME pin ends. Note: The chip features a warm-up function. After power-on, the REL pin outputs a high level for 10 seconds and then a low level for 2 seconds before returning to normal operation. The duration of the warm-up phase is independent of the ONTIME setting.
3
VSS
Input
Grounding
Reference circuit
Precautions
1. A pyroelectric infrared sensor detects changes in infrared energy and outputs a signal accordingly. However, it will also generate a signal in response to changes in infrared energy from non-human sources—for example, small animals, direct sunlight or other intense light sources, or conditions where air conditioners cause rapid temperature fluctuations. If the heat source is stationary or moving at high speed, or if the ambient temperature is close to human body temperature, the infrared signal emitted by the human body may not produce sufficient fluctuations to trigger the sensor’s output; hence, the sensor will not generate a signal.
2. By properly installing the sensor’s optical window in conjunction with a Fresnel lens, an ideal detection distance and angle can be achieved. During the design phase, it is important to select an appropriate lens and ensure that the sensor’s metal housing is not directly exposed to the external flowing air.
3. During use, try to avoid excessive vibration. The optical window must be kept clean and free from friction by hard objects or other debris, as such friction could lead to performance failure or instability.
4. During the sensor soldering process, avoid excessively high temperatures and prolonged soldering times as much as possible. It is recommended to keep the temperature below 265℃ and the soldering time under 3 seconds.
Packaging and Quantity
Component Packaging Drawing (Unit: mm)
100 sensors per pack / in cardboard box
Outer carton packaging drawing (unit: mm)
Small packaging box: 390*260*145; packaging sensors: 30*100 = 3,000 units.
Large packaging box: 630*440*310; packaging sensors: 4*30*100 = 12,000 units
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Contact Us
Address: Su Lou Electronic Industrial Park, Zhifang Town, Ruzhou City, Henan Province
Phone:+86-375-6012968
Fax:+86-375-6012918
QQ: 2881352371
Email:sales@rzyufeng.com
Website:http://www.rzyufeng.com