S001F24A51 Temperature-Compensated Digital Passive InfraRed PIR Flame Sensor

1.Overview

The S001F24A51 integrated pyroelectric flame sensor utilizes a new environmentally friendly lithium

tantalate (LiTaO₃) single-crystal material for its sensing element. It is a 4-pin digital PIR flame sensor

that integrates a digital signal conditioning chip (IC) with the sensing element within an electromagnetic

shielding cover. The probe communicates bidirectionally with an external controller to configure various

operational states. The sensing element couples the detected flame flicker signal into the digital signal

conditioning IC through a very high-impedance differential input circuit. The digital IC chip converts

the signal into a digital format via a 14-bit ADC, facilitating subsequent signal processing and logic

control.Configurations such as detection sensitivity (trigger threshold), blind time after trigger reset, signal pulse counting time window, algorithms, and the selection of three operating modes can be implemented by the external controller (µC) through the single-wire communication interface (SERIN) to configure internal registers. During routine continuous flame sensing, the µC does not need to remain active (it can enter standby mode to save power). Only when the digital probe detects a flame flicker signal meeting the pre-configured trigger conditions does the internal conditioning IC send an interrupt wake-up command to the µC via the INT/DOCI interface, prompting the µC to activate and execute subsequent control actions. Depending on the configured operating mode, the µC can also periodically or forcibly read the digital flame signal value from the probe through the DOCI port, and then determine follow-up actions based on its programmed algorithm.Thanks to the power-efficient interrupt wake-up mechanism, this digital sensing system is ideal for applications with high energy-saving requirements, particularly battery-powered scenarios, making it the most energy-efficient sensing control solution available.

2.Characteristic

1.Digital signal processing with bidirectional communication to the controller；

2.Configurable detection trigger conditions and support for three different operating modes, enabling open flame monitoring results output and ADC-filtered flame signal data output；

3.Built-in second-order Butterworth bandpass filter for the infrared sensor, shielding input interference from other frequencies；

4.The infrared signal conditioning circuit is fully encapsulated within an electromagnetic shielding cover, with only power and digital interface pins exposed, providing exceptional resistance to radio frequency interference；

5.The system's operational mechanism is deeply optimized for power efficiency, making it suitable for battery-powered devices；

6.Power supply voltage and on-chip temperature detection；

7.Operates with quick stabilization after a self-check during power-up；

8.Utilizes eco-friendly LiTaO₃ sensing material, strictly complying with RoHS environmental requirements without the need for exemptions or RoHS certification.

3.Application

1. Various open flame monitors;

2. Fire detectors;

3. Internet of Things flame sensing equipment;

4. Fire alarms for homes, industrial plants, and factories.

4. Performance parameters

4.1 Maximum Ratings

Electrical overstress exceeding the parameters in the table below may cause permanent damage to the device. Operation beyond the maximum rated conditions may affect the reliability of the device.

4.2 Electrical Characteristics (Typical test conditions: TAMB=+25℃, VDD=+3V)