Chips for wireless data transmission. Reference data

Encyclopedia of radio electronics and electrical engineering / Reference materials

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The article discusses Telecontrolli microcircuits for object identification and registration systems (access security systems, car immobilizers, automated trading, etc.). This is a wide range of devices that operate at distances from one to several hundred meters and allow you to solve various problems simply, easily and reliably.

Initially, the market for short-range device (SRD) components was focused primarily on use in remote control systems for the automotive industry (locking and unlocking car doors without the use of a mechanical key).

The emergence of transceiver devices made on a single chip makes it possible to simplify the solution of the problem of wireless data transmission. A typical system based on such microcircuits consists of a microcontroller, a receiver and a transmitter (or a transceiver) and a small number of external elements. The areas of application of such data transmission systems are very wide: alarm devices, wireless networks, telemetry, two-way call systems, remote control and monitoring. In addition to traditional applications, it is worth mentioning systems for monitoring environmental parameters, access and movement control, wireless barcode reading, and the list is far from exhausted.

Naturally, such a promising direction in the electronic components market could not go unnoticed. As a result, chips for transceiver systems are produced by Infineon Technologies AG, Gran-Jansen AS, Xemics, RF Monolithics Inc., Microchip, Maxim, Telecontrolli.

Very often, the ratio of the frequency range criteria and the cost of devices are decisive for domestic developers. Therefore, close attention should be paid to the products of the company Telecontrolli, almost unknown in Russia.

Telecontrolli specializes in the production of hybrid integrated circuits (HICs) using thick film technology. Products manufactured include custom GIS, standard electronic modules, DC/DC converters and radio frequency transmitters/receivers. Telecontrolli is part of the IPM Group, whose main activity is telecommunications and data transmission. The company has representative offices in almost all European countries, South Africa, Canada, the USA, Brazil and Argentina, and its distribution network covers almost the entire world.

In table 1 shows microcircuits for wireless communications produced by the company (XXX - operating frequency, MHz).

When developing various systems with wireless data transmission, a receiver and transmitter in the same housing are not always required, and if a receiver (or transmitter) is not needed, then why pay for it? The situation is similar with built-in controllers. Thus, a wide range of devices from Telecontrolli allows you to solve a variety of application problems with maximum efficiency.

Let's take a closer look at the components of the ultrasonic and infrared ranges.

Ultrasonic transmitters/receivers UTR1 - UTR3 are hybrid circuits, which makes it possible to create an ultrasonic detector on their basis with a minimum number of external elements. The change in the amplitude of the input signal (frequency - 40 kHz) caused by the movement of the object is detected, and thus the moving target is detected. High stability of GIS parameters was achieved using the "Thick film hybrid" technology developed by Telecontrolli. All this makes it possible to effectively use UTR1-UTR3 transmitters/receivers in automobile, apartment and office security systems, and automatic door openers.

The main technical parameters of GIS UTR1 - UTR3 are given in Table. 2.

As an emitter and receiver of an ultrasonic signal, MA40S3S and MA40S3R sensors from Murata or similar are used, which are connected directly to the pins of the microcircuit. Typical circuits for connecting transmitters/receivers UTR1-UTR3 are shown in Fig. 1.

As you can see, GIS of this family are functionally complete devices that require a minimum of external elements for connection.

To conclude this brief overview of transceiver systems, let’s tell you a little about IR GIS. Of great interest is the PID1 passive infrared detector, which responds to thermal radiation from the human body. The device is indispensable in security and safety systems, given its high immunity to radio interference and functional completeness. To assemble a complete device, you only need four capacitors, a variable resistor, an LED (optional), an actuator and a Heimann LHi954 IR sensor. A typical circuit diagram for connecting the PID1 detector is shown in Fig. 4.

If it is necessary to completely block access to any room (and not only the room), then the most optimal solution is an infrared barrier based on the IRT1 pulse transmitter and the IRD1 detector (a typical application diagram is shown in Fig. 5).

The parameters of these microcircuits are given in Table. 3.

The IRD1 microcircuit, in addition to the main one (pin 14), has another power pin (pin 15), to which it is permissible to apply a voltage in the range of 9...18 V. A low-power load can also be connected to this pin when the supply voltage of the microcircuit is applied to the main conclusion.

Author: N.Rakovich, Moscow

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