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  • Power Line Lighting Control

  • Created: Sep 15, 2014

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Summary

The TDA5051A lighting control demo consists of a master controller and a slave lighting controller. The master controller uses the High-Bay board, which consists of the LPC1114 microcontroller, the TDA5051A PLM IC, and power management circuitry. An AC-DC converter is used to provide +13 V DC supply voltage. The master employs four PCF8883 capacitive proximity switches to provide On/Off, Dim Up, Dim Down, and Select outputs of the remote lighting slave controller. The slave controller consists of the High-Bay board, an AC-DC converter to provide +13 V supply voltage, and a LED array.

The TDA5051A is an ASK modem chip designed for power line communications. In this application, the carrier frequency is 125 kHz. However, the frequency can be changed with the specified range by changing the frequency of the crystal or clock input. The TDA5051A consists of an Automatic Gain Control (AGC) amplifier and Analog-to-Digital Converter (ADC) on the front with digital band-pass filtering and demodulation of the received signal. It also contains a lookup Read Only Memory (ROM) and Digital-to-Analog Converter (DAC) to provide the proper wave shape and envelope for transmitted data. The internal amplifier then drives an external network to couple the transmit data onto the AC lines. The functions are executed by pressing one of four control buttons located externally to the board; On/Off, Dim Up, Dim Down, and Select.

A MAX3232 RS-232 interface is provided on the TDA5051A to provide a programming interface to program the device via the ISP (In-System Programming) capability. The RS-232 signals are brought out on connector SV4 with the pin assignments as follows: Pin 1 to Ground, Pin 2 to Receive, Pin 3 to Transmit, Pin 4 to LPC1114 Reset.

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