S001f24A39 Temperature-Compensated Digital Passive Infrared Flame Sensor

• Customization: Available
• Installation Type: Wall-Mounted Type
• Sensing Type: Thermocouple
• Model NO.: S001F24A39
• Contact: Contactless
• Output Signal Type: Analog Type
• Production Process: Integration
• Material: Dewpoint Lithium Chloride
• Measuring Medium: Temperature
• IP Rating: IP68
• Certification: RoHS
• Customized: Customized
• Operating Voltage: 1.5~3.6V
• Digital Clock Low Level Time: Typical: 1-2us
• Digital Clock High Level Time: Typical: 1-2us
• Window Size: B: 5.2 X 4.2mm
• Transport Package: Standard Package
• Specification: 1pcs
• Trademark: HW
• Origin: China
• Production Capacity: 1000000/Week

Product Description

Product Description

The S001F24A39 integrated pyroelectric flame sensor utilizes a new environmentally friendly lithium
tantalate (LiTaO) 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 LiTaO 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.

Product Parameters

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.

 

Parameter	Symbol	Min.	Max.	Unit
Supply voltage	VDD	-0.3	3.6	V	25ºC
Pin voltage	Vnto	-0.3	Vdd + 0.3	V	25ºC
Pin current	Into	-100	100	mA	Single time ,single pin
Storage temperature	TST	-30	70	ºC	< 60% R.H
Operating temperature	Toper	-20	55	ºC

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

Parameter	Symbol	Min.	Typical	Max.	Unit	Note
Working conditions
Operating voltage	VDD	1.5	3	3.6	V
Working current, Vreg on	IDD1		5	6.0	µA	This product is not suitable
Operating current, Vreg off	IDD		3	3.5	µA	Applicable to this product Vdd = 3V, no load
Input parameters SERIN
Input low voltage	VIL	- 0.3		0.2Vdd	V
Input high voltage	VIH	0.8Vdd		0.3 + Vdd	V	Max V < 3.6V
Input current	Ii	-1		1	µA	Vss<Vin<Vdd
Digital clock low level time	tL	200		0.1/ FCLK	nS/µS	Typical: 1-2µS
Digital clock high level time	tH	200		0.1/ FCLK	nS/µS	Typical: 1-2µS
Data bit writing time	tBW	2/FCLK - tH		3/FCLK-- tH	µS	Typical: 80-90µS
Write timeout	tWA	16/FCLK		17/FCLK	µS
Output pin INT/DOCI-OUT
Input low voltage	VIL	- 0.3		0.2Vdd	V
Input high voltage	VIH	0.8Vdd		0.3 + Vdd	V	Max V < 3.6V
Input current	IDI	-1		1	µA	Vss<Vin<Vdd
Data readable setup time	TDS	4/Fclk		5/Fclk	µS
Data bit preparation time	TBs			1	µS	CLOAD < 10pF
Forced reading settling time	TFR	4/FCLK			µS
Interrupt clear time	TCL	4/FCLK			µS
Digital clock low level time	TL	200		0.1/ FCLK	nS/µS	Typical: 1-2µS
Digital clock high level time	TH	200		0.1/ FCLK	nS/µS	Typical: 1-2µS
Bit data read time	Tbit			24	µS	Typical: 20-22µS
Reading timeout	TRA	4/FCLK			µS
DOCI pull-down duration	TDU	32/FCLK			µS	For data update
Input PIRIN/NPIRIN
PIRIN/NPIRIN to Vss Input Impedance		30		60	GΩ	-60mV<Vin<60mV

 

Input resistance differential value		60		120	GΩ	-60mV<Vin<60mV
PIRIN Input voltage range		-53		+53	mV
Resolution/step size		6	6.5	7	µV/Count
ADC output range		511		2^14-511	Counts
ADC Bias		7150	8130	9150	Counts
ADC Temperature Coefficient		-600		600	ppm/K
ADC Input noise RMS valueF = 0.1Hz...10Hz			39	91	µVpp	f = 0.09...7Hz
Supply voltage measurement
ADC Output range		2^13		2^14-511	Counts
Voltage resolution		590	650	720	µV/Count
ADC Bias @ 3V			12600		Counts	about ±10% offset

 

Temperature measurement (single point calibration required)
Resolution				80		Counts/K
ADC output range		511			2^14-511	Counts
Bias value @ 298K				8130		Counts	about ±10% offset
Oscillators and filters
Low pass filter cutoff frequency		FCLK*1.41/2048/π				Hz	2nd order BW
High pass filter cutoff frequency		FCLK*P*1.41/32768/π				Hz	2nd order BW P = 1 or 0.5
On-chip oscillator frequency	Fosci	60	64		72	kHz
System clock	FCLK		Fosci/2			kHz

4.4 Test Method
 

1: Blackbody 500K 2: 1Hz chopper 3: Grating Ø4mm 4: Baffle 5: PIR 6: Digital signal

Parameter	Symbol	Typical	Min.	Max.	Unit	Note
Sensitivity	Vp-p	200	160		uV
noise	Vp-p	26		39	uV

4.6 Output trigger or alarm event logic

The output signal of the bandpass or lowpass (depending on the configuration) filter is calculated. When the flame signal value level exceeds the pre-configured sensitivity threshold, an internal pulse is generated. When the signal changes sign (or does not need to change sign) and exceeds the set threshold again, a second pulse is calculated. The conditions for output triggering or fire alarm, such as the number of pulses and the counting time window in which the pulse occurs, are configurable. If the previous event is cleared by resetting the interrupt, the detection stops for the next configurable blind lock time. This feature is very important to prevent self-excited false triggering in application scenarios that require high sensitivity to detect fire alarms.
The interrupt will be cleared by driving a low level "0" for at least 120µs (tCL); the processor can then switch the port back to a high impedance state.
 

4.7 Serial interface and configurable register function description

The configuration of the conditioning IC control algorithm is achieved by programming the conditioning IC related registers through the SERIN pin of the controller, using a simple clock data single-wire communication protocol. The configured data of the conditioning IC is read out by the controller using the INT/DOCI pin, using a similar clock data single-wire output protocol. When SERIN is at a low level for at least 16 system clocks (and Vdd is in the normal range), the conditioning IC inside the probe begins to accept new data.
The following parameters can be configured and adjusted through the conditioning IC registers:
 

Window lens size, transmission spectrum and viewing angle
 

Central wavelength(nm)	Half-peak width (nm)	Peak transmittance	Cut-off range (nm)
3910±40	90±20	≥75%	UV~11000(≤1%)

Optical size:

Parameter Item	numeric value	Unit
window size	5.2*4.2	mm^2
Sensitive element area	2*1.5	mm^2
Transmittable center wavelength	3.87-3.95	μm
Detection Angle	100	Deg.

Detailed Photos