YJJ BISS0001 Pyroelectric Infrared Wireless Sensor Processing Chip

Product Description:

YJJ BISS0001 Pyroelectric Infrared Wireless Sensor Processing Chip

Features:

BISS0001 is a thermopile infrared sensing signal processing integrated circuit with a CMOS analog-digital hybrid structure and two packaging options: DIP-16 and SOIC-16. The chip integrates circuits such as voltage comparators, state controllers, delay circuit timers, lockout time timers, and reference voltage sources. It is commonly used in anti-theft alarm systems, automatic doors, and other automatic switches.

The typical circuit of the thermopile infrared delay lighting controller constructed using BISS0001 is shown in the figure. This controller can achieve the control of the light turning on when someone enters and turning off when they leave. It is often used for automatic control in bathrooms, storage rooms, and mirror lights in dressing tables.

The thermopile infrared delay lighting controller consists of a power supply circuit, an infrared delay control circuit, and a control execution circuit. The power supply circuit is composed of a power transformer T, rectifier diodes VD1 to VD4, filter capacitors C7 and C9, bypass capacitor C8, and a three-terminal voltage regulator IC2. In practical applications, T is usually selected as a 220V/9V, 5VA high-quality power transformer; VD1 to VD4 are selected as IN4001 silicon rectifier diodes; IC2 is selected as the LM7805 three-terminal voltage regulator. The 220V AC power is reduced, rectified, filtered, and stabilized to form a stable +5V DC voltage to supply power to the entire control circuit.

The infrared delay control circuit consists of a thermopile infrared sensor PIR, sensitivity potentiometer RP1, thermopile infrared sensing signal processing integrated circuit BISS0001 (IC1), delay components R1, C2, potentiometer RP2, and light-sensitive resistor RG, and other peripheral components. In practical applications, PIR is usually selected as P2288, PH5324, or LH1956 type thermopile infrared sensors. To improve the sensitivity of the PIR sensor in sensing infrared rays, a parabolic or hemispherical Fresnel lens should be installed in front of the sensor; RG is selected as MG45 type light-sensitive resistors, and the difference in resistance between the bright and dark states should be as large as possible; RP1 and RP2 are selected as WSW type organic solid-state potentiometers.

The control execution circuit consists of electronic switches VT, solid-state relays SSR, and lighting fixtures H. In practical applications, VT is usually selected as 9013 type silicon NPN transistor, with a requirement of β ≥ 100; SSR is selected as JCX-2F-DC5V type zero-crossing compact solid-state relay; H can be selected as a 100W or below incandescent bulb as needed.

Working principle:

After the circuit is powered on, when no one enters the monitoring range of the thermopile infrared sensor PIR, the thermopile infrared sensing signal processing integrated circuit BISS0001 is in the reset state, the control signal output terminal (pin 2) Vo outputs a low level, the electronic switch VT is in the cutoff state, the solid-state relay SSR is turned off, and the lighting fixture H does not light up, and the controller is in the monitoring state.

Chip structure and functional modules
The BISS0001 integrates the following modules:
High-impedance operational amplifier: Receives and amplifies sensor signals, compatible with various pyroelectric infrared probes.
Bidirectional amplitude discriminator: Filters out environmental noise interference, ensuring that valid signals trigger.
Delay timer: Controls the duration of the output signal (adjustable to several minutes).
Lockout timer: Prevents repeated triggering, enhancing system stability.
Technical features:
Wide voltage adaptability (2V - 6V), low static power consumption.
Built-in reference power supply, simplifying the design of peripheral circuits.
The threshold of the bidirectional detector amplifier can be adjusted by an external resistor.
Compatible with DIP and SOP packages, facilitating installation in different scenarios.
Typical application scenarios
Smart lighting control: By 2024, it will be applied to solar street lighting systems, human-sensing desk lamps [2] and corridor automatic lights, achieving the energy-saving effect of "lights on when people are present, lights off when people leave".
Security alarm system: Composed of a pyroelectric sensor and infrared intrusion detector, it triggers a buzzer or an alarm light.
Home appliance automatic control: Controls devices such as automatic doors, electric fans, and dryers, enhancing the level of intelligence.
Limiting parameters
Operating temperature: -20℃ to +70℃ (will be extended to -20℃ to 70℃ by 2024) [7-8].
Storage temperature: -65℃ to +150℃ [8].
Input voltage range: VSS - 0.3V to VDD + 0.3V (VDD ≤ 6V) [8].
Pin withstand current: ±10mA (VDD = 5V)

When someone enters the monitoring range of the thermopile infrared sensor PIR and moves, PIR can convert the changes in human emitted infrared rays into an electrical signal output, with a frequency of 0.1 to 10Hz.

RP2 and RG form a light control circuit. During the day, the light-sensitive resistor RG presents a low resistance when exposed to natural light. When the level Vo at pin 9 of BISS0001 is <0.2VDD, it triggers the inhibition, and the subsequent circuits of BISS0001 do not work, and the lighting fixture H does not light up. At night or in a dim environment, the resistance of RG increases. When the level Vo at pin 9 of BISS0001 is >0.2Vpp, BISS0001 is in the monitoring state, and the output terminal % remains at a low level. If at this moment someone moves within the PIR monitoring range, the PIR will output an electrical signal that changes with the movement of the human body. This signal is sent to the internal independent high input impedance operational amplifier OP1 of the BISS0001 chip through pin 11N+ (the 14th pin). After being pre-amplified by OP1, it is output through pin 16 and coupled to pin 2IN- (the 13th pin) inside the chip. Then, it is amplified by the internal second-stage operational amplifier OP2 and processed by the internal bidirectional amplitude discriminator. Finally, an effective trigger signal is output to start the internal delay timer TX of the chip. Then, the state controller outputs a high-level control signal from pin 2 of BISS0001, causing the electronic switch VT to conduct and drive the solid-state relay SSR to turn on, and the lighting fixture H to light up and emit light.

The time for the 2nd pin of BISS0001 to output a high-level control signal is equal to the delay time of the circuit. It is determined by the time constant of the delay element R1 and C2. As shown in the figure, the time is 15 seconds. Since the 1st pin of the chip is connected to a high level, the circuit is in a state allowing repeated triggering. That is, within the delay time (15 seconds), as long as someone moves slightly, the circuit is re-triggered, and the 2nd pin will output a high-level signal with a pulse width of 15 seconds. Therefore, as long as someone is in the bathroom, the lighting fixture H will always be illuminated. Only after the person leaves, after a 15-second delay, the circuit resets, and the lighting fixture H automatically turns off.

Specifications: