January 2010
Doc ID 12791 Rev 3
1/55
AN2451
Application note
ST7540 FSK powerline transceiver
design guide for AMR
Introduction
The ST7540 reference design has been developed as a useful tool to demonstrate how a
small, high-performance powerline node can be built using the ST7540 FSK transceiver.
With this reference design, it is possible to evaluate the ST7540 features, in particular, its
transmitting and receiving performances through actual communication on the power line.
The ST7540 reference design may be considered to be composed of three main sections:
●
Power supply section, specifically tailored to match powerline coupling requirements
and to operate within a wide range of the input mains voltage
●
Modem and crystal oscillator section
●
Line
coupling interface section
The coupling interface is designed to allow the ST7540 FSK transceiver to transmit and
receive on the mains using 72 kHz carrier frequencies, within the European CENELEC
standard A-band specified for automatic meter reading.
Figure 1.
ST7540 reference design board with outline dimensions
As it can be seen from the picture above, a special effort has been made to obtain a very
compact reference design board, while keeping the focus on transmission and receiving
performances.
Note:
The information provided in this application note refers to EVALST7540-2 reference design
board.
52
m
m
76 mm
Содержание ST7540
Страница 47: ...AN2451 Application ideas Doc ID 12791 Rev 3 47 55 Figure 47 Line coupling interface for 110 kHz channel...
Страница 48: ...Application ideas AN2451 48 55 Doc ID 12791 Rev 3 Figure 48 Line coupling interface for 132 5 kHz channel...
Страница 51: ...AN2451 Board layout Doc ID 12791 Rev 3 51 55 Appendix A Board layout Figure 49 PCB layout component placing...
Страница 52: ...Board layout AN2451 52 55 Doc ID 12791 Rev 3 Figure 50 PCB layout top view...
Страница 53: ...AN2451 Board layout Doc ID 12791 Rev 3 53 55 Figure 51 PCB layout bottom view...
