ST7540TR STMicroelectronics

ST7540 FSK power line transceiver General features Half-duplex frequency shift keying (FSK) transceiver Integrated power line driver with programmable voltage and current control Programmable mains access: Synchronous HTSSOP28 Exposed Pad Asynchronous Single supply voltage (from 7.5V up to 13.5V) Very low power consumption (I = 5mA) q Description Integrates 5V voltage regulator (up to 50mA) The ST7540 is a Half Duplex with short circuit protection synchronous/asynchronous FSK Modem Integrated 3.3V voltage regulator (up to 50mA) designed for power line communication network with short circuit protection applications. It operates from a single supply 3.3V or 5V digital supply voltage and integrates a line driver and two linear regulators for 5V and 3.3V. The device operation 8 Programmable transmission frequencies is controlled by means of an internal register, Programmable baud rate up to 4800BPS programmable through the synchronous serial Receiving sensitivity up to 250V interface. Additional functions as watchdog, clock RMS output, output voltage and current control, Suitable for applications in accordance with EN preamble detection, time-out and band in use are 50065 Cenelec specification included. Realized in Multipower BCD5 Carrier or preamble detection technology that allows to integrate DMOS, Bipolar Band in use detection and CMOS structures in the same chip. Programmable control register Watchdog timer 8 or 16 Bit header recognition ST7537 and ST7538 compatible UART/SPI host interface Order codes Part number Package Packaging ST7540 HTSSOP28 (Exposed Pad) Tube ST7540TR HTSSOP28 (Exposed Pad) Tape and reel September 2006 Rev 2 1/44 www.st.com 44Contents ST7540 Contents 1 Block diagram 4 2 Pin settings 5 2.1 Pin connection 5 2.2 Pin description 5 3 Electrical data 7 3.1 Maximum ratings 7 3.2 Thermal data . 7 3.3 Recommended operating conditions . 8 4 Electrical characteristics . 9 5 Crystal resonator and external clock 15 6 Functional description 16 6.1 Carrier frequencies 16 6.2 Baud rates 16 6.3 Mark and space frequencies 17 6.4 ST7540 Mains access . 18 6.5 Host processor interface . 19 6.5.1 Communication between Host and ST7540 . 20 6.5.2 Control register access . 22 6.6 Receiving mode 23 6.7 Transmission mode . 26 6.8 Control register . 32 2/44