Elmers ( elmos ) has announced the introduction of pyroelectric body-sensing sensors 
The chip E931.98 , the application of this solution can protect the relay contacts, extend their service life, and effectively reduce and eliminate the arc and harmonics generated by the AC grid during the load relay opening and closing process.
After the pyroelectric probe detects the movement of the human body, the detected signal is transmitted to E931.98 for analysis and processing, and then the connected load switch (such as a relay) is controlled according to the set working conditions, and after the system is powered on, No heat engine process is required.
Functionally, the E931.98 single-chip solution integrates pyroelectric sensors All the functions required, it digitizes the acquired PIR signal and outputs the push-pull signal of REL. Alternatively, the enable state of the REL signal can be controlled by the OEN pin on the chip. In order to protect the load relay, colleagues can reduce and eliminate the effects of harmonics and surge current generated during the switching relay. The chip increases the voltage (mains grid) zero-crossing detection function. Only when the grid voltage has zero crossing, the REL function of the chip will output a valid signal to turn the rear load relay on or off. The technology of the zero-crossing switch is very suitable for switching relays, which can greatly extend the life of the relay.
In view of the application of many lighting (such as corridor lighting, automatic switch, security alarm, etc.), it is necessary to distinguish between different working modes of daylight and night. The chip is also designed with OEN enable pins through external photosensitive components such as CDS and light sensitive. Transistor, etc., to adjust the voltage level of the OEN pin to enable or shield the output of REL.
In addition to the above functions, the E931.98 also provides users with flexible sensitivity (SENS) settings and delay time settings (ONTIME). These two functions are also very simple to use, just give a certain analog level on these two pins, the internal circuit sampling of the chip will determine the sensitivity and the time required for the delay according to the level. While ensuring user flexibility and flexibility in configuration, the solution simplifies external circuit design and reduces required components to the utmost extent, and it is not difficult to find this advantage from its typical application circuit (Figure 1). In terms of anti-RF radio frequency interference, the program is particularly prominent due to the highly integrated semiconductor process and the most simplified external circuitry.
The main advantage:
The PIR signal is fully digitized after entering the chip.
A built-in Zener diode allows for a wider power supply range.
Very low operating current (maximum operating current: 18μA).
Adaptive zero-crossing detection.
Immediately after power-on, it can enter normal working condition.
User configurable sensitivity, time delay and an external photosensor
Excellent resistance to RF interference
Main application areas:
In human-inspired lighting applications, the relay can be turned on and off when the voltage crosses zero.
Typical application circuit diagram:
For more information, data sheets, application notes, and for samples and reference designs, please send the theme of "E931.98 Smart PIR" e-mail to sales_china @ elmos .com, visit the company's Web site (www. Elmos .com) .
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