71M6521 Demo Board User’s Manual
Revision 2.18
© 2005-2009 TERIDIAN Semiconductor Corporation
Page: 77 of 111
3.4.2 D6521T4A10 FEATURES FOR THE INDIA MARKET
Several India-specific features were added to the D6521T4A10 Demo Board to support the detection of
tamper attempts. These features are:
1) A 2-pin header (TP1) is provided that allows the connection of a “neutral-missing” transformer. This
transformer normally provides enough output voltage and current to supply the Demo Board in case the
main AC supply is disconnected.
2) The output of the NM circuit is routed to the 6521FE and annunciated by LED D14.
3) Magnetic tamper switch (SW3).
4) The net connected to the pushbutton is separated from the 6521FE by a capacitor. This prevents
drainage of the battery by constant activation of the pushbutton.
For details see the schematics in the Appendix.
The India-specific features are currently not supported by Demo Code. Demo Code will be supplied to
interested customers as soon as it becomes available.
3.4.3 D6521T4A10 BOARD DESCRIPTION
The D6521T4A10 Demo Board is very similar to the D6521T4A8, and D6521T4A7 Demo Boards. The main
functional elements and connectors are shown in Figure 3-5.
Figure 3-5: D6521T4A10 Demo Board
5 VDC Power Supply
Components
for India option
IB input
IA input
ICE
interface
Magnetic
sensor