AN2451
Board description
Doc ID 12791 Rev 3
13/55
5 Board
description
The ST7540 reference design is composed of the following sections:
●
Power supply section, based on ST’s VIPer12A-E IC
●
ST7540 modem and crystal oscillator section
●
Line coupling interface section, with three subsections:
–
Transmission active filter
–
Transmission passive filter
–
Receiving passive filter.
The board also has two connectors, which allow the user to plug the mains supply on one
side of it and the I.B.U. communication board on the other side.
Figure 6.
Positioning of the various sections of the board
The schematics of the whole reference design appear in
and
shows
the modem and the coupling Interface circuits, while
represents the power supply
circuit. In both the schematics, high voltage regions are highlighted.
lists the components used to develop the reference design board. All parts have
been selected to give optimal performances.
The layout of the printed circuit is given in
,
and
