51 Research and Design, Electronic Engineers website - Embedded Systems, MCU, DSP, EDA, Test and Measurement, Components, Communications, Power, Microelectronics, Semiconductors

    Abstract: TDA5051A is the Phillips Corporation newest promoted section of altitude conformity household automation special-purpose power source modulates the demodulation chip, through sets up the family network, the user may anytime and anywhere through family’s in supply line control domestic electric appliances. In the article introduced the TDA5051A internal composition, the base pin function and the principle of work, and have given its model application electric circuit.

    Key word: TDA5051A household automation family network

1 introduction

Along with science and technology development, the people after the success develop and has applied the industrial automation and the office automation, also at present will shift with the life information related family, the so-called household automation, is as the name suggests refers to the housing unites each kind of home use equipment through the network in the same place, under the center control computer’s management and the control, according to master’s decree, causes each kind of electrical appliances equipment to coordinate, to have own responsibility mutually, realizes the housework and the family management automates highly, provides service as far as possible for family various members. Household automation’s object not only includes each kind of electrical kitchen facility, the sound video equipment, will also include air conditioning, the security system, the fire-alarm system, the lighting system as well as future family work entertainment system. How carries on the home use equipment composition network the data communication is a household automation engineering research important topic. At present has internationally also formulated with household automation related open style standard CEBus and a series of standards, in the standard has given the family network different media transmission technology, if uses the tradition to lay down the special electric cable line the method, then the electric cable line’s installment and the maintenance cost are high, moreover is not advantageous for the branch, the segment; But uses the power line not to need other wiring as the correspondence media, may use directly had the power line network to carry on the correspondence, and the line may proliferate the construction each corner, is advantageous with other intelligent electrical appliances equipment integration, realizes the household automation, therefore this computing technique has the incomparable merit. In the article introduced household automation special-purpose MODEM chip TDA5051A, it is the Phillips Corporation newest promoted section of altitude conformity household automation special-purpose power source modulates the demodulation chip. This chip is specially for through the power line either the road or any double thread direct current, the exchange electric wire carries on the digital signal transmission to design, uses in the household automation system the family intelligence controller and the power line and the power line and between the domestic electric appliances equipment provides the interface connection, enables the family user to be possible momentarily momentarily to control each domestic electric appliances through family’s in supply line.

2 TDA5051A principles of work

TDA5051A is a power source special-purpose modem chip, mainly uses in the ASK modulation system, the baudrate is 600 or in 1200 family electric power carrier network, uses the 5V single power source power supply, conforms to EN50065-2 to be exempt from the electromagnetic wave disturbing effect the strict stipulation. This chip uses the complementary metal oxide semiconductor (CMOS) the structure, has low characteristics and so on power loss, redundant reliability as well as temperature control. May with microprocessor’s TTL/CMOS level pin docking, the chip built-in clock circuit, clock circuit’s output pin be possible to provide the time function directly for the microprocessor. TDA5051A pin arrangement as shown in Figure 1, pin function like table 1 arranges in order.

Table 1 TDA5051A pin function

TDA5051A internal circuit functional block diagram as shown in Figure 2. May see by the chart, its internal circuit by parts and so on ROM memory, D/A switch, A/D switch, logical controller, oscillator, digital demodulator, digit bandpass filter, power source and counter is composed.

TDA5051A has transmits and receives two kind of working patterns, moreover for the convenience system debugging specially has also designed the test function. In transmits under the pattern, the digital signal inputs through the DATAIN pin to the chip, considered the external environment the change, to obtain a better stability, the chip carrier frequency may control by the microprocessor, may also by chip’s oscillator production. By DATA IN pin input signal after analog modulation, carries on the reshaping again by the specific electric circuit, like this may the very good barrage jamming, sharpen the antijamming ability. Finally (10 feet) sends out directly again the signal by simulated signal transmitting end TXout. In receives under the pattern, after simulated signal receiving end RXIN (14 feet) receive the simulated signal, trades by the D/A switch is the digital signal, after then passes through the digital bandpass filter filter and the digital demodulator demodulation, (2 feet) outputs first by digital signal out-port DATA. Simulated signal receiving end RX IN (14 feet) built-in (- 6~ 30dB) increased the amplifier automatically, causes the simulated signal which receives to occupy the digital demodulator’s sensitive region throughout, sharpens the antijamming ability, cuts the error rate.

    What needs to pay attention, in the transmission pattern, electric circuit’s receiving unit was still effective, and can receive and distinguish the transmission the signal.

3 in set up in the family network system’s application

Uses when the power line sets up the household automation network, network topology to always linear, system structure as shown in Figure 3. The system by one master control unit, the 220V power line transmission path and certain joining-ups is controlled the unit on the power line to be composed, uses the monolithic integrated circuit completely for the central processor. One master control unit may control many to be controlled the unit, the master control unit issues the control command responsibly, in the order includes the address message and the control information, after the TDA5051A modulation transmits through the power line is controlled the unit respectively, after being controlled the unit receives the information, checkup address, only then, when receives the address tallies after own address and verifies unmistakably, only then defers to the command control equipment work which receives, and to master control unit return information. TDA5051A and monolithic integrated circuit’s interface circuit and TDA5051A and power line’s interface circuit as shown in Figure 5.

4 concluding remark

Introduced with emphasis the TDA5051A principle of work, how as well as does set up the family network using TDA5051A, as space is limited, has not been able to involve the correspondence and the software programming. What needs to pay attention, sets up using TDA5051A when the family network realizes the data communication, should on the identical phase line hang meets the electrical appliances equipment, obtains the best correspondence effect.