FUNCTIONAL DESCRIPTION

The L9705 circuit monitors the status of the con-

tacts which are connected through the series ex-

pins. The contacts equivalent circuit is supposed

to be as shown in fig.2 for GND connected con-

connected contacts (IN 5 to 8).

Figure 1: Typical application diagram for the L9705 circuit. The current flowing in the arrow direction is

capacitance at the corresponding pins.

Figure 2: The contact sense input connection with the contact equivalent circuit for GND connected

contacts.

contacts.

L9705

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