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ELM365

Security System Controller

Elm Electronics 

ELM365

Pin Descriptions

VDD (pin 1)

This pin is the positive supply pin, and should

always be the most positive point in the circuit.

Internal circuitry connected to this pin is used to

provide power on reset of the microprocessor, so

an external reset signal is not required. Refer to

the Electrical Characteristics section for further

information.

OutP (pin 2)

This is the (active high) pulsed alarm output.

When in an alarm state, it alternates between a

logic high level (VDD) for 1.5 seconds and a low

level (VSS) for 0.5 seconds. This output

automatically resets after 5 minutes.

OutC (pin 3)

This is the constant level alarm output. It is

switched to a high level (VDD) during an alarm

condition, and is otherwise at a logic low level.

This output automatically resets to a low level

after 5 minutes.

panic (pin 4)

This active low input is debounced and used to

immediately trigger an alarm from normally open

inputs such as panic pushbuttons or tamper

switches. If unused, this input can be left open

circuited, as there is an internal pullup resistor on

the pin (see the specs).

LED (pin 5)

This is an active low LED drive output. It will

pulse rapidly to warn that the system is in a 45

second delayed alarm period, or will pulse slowly

(about 1.5 seconds on, 0.5 seconds off) if an

alarm is in progress or has previously occurred.

By adding a suitable series resistor, an LED can

be directly driven from this pin.

ILoop (pin 6)

This pin is used for monitoring a normally closed

loop, connected between the pin and VSS. To

reduce the possibility of nuisance triggers, a 0.5

second debounce period is provided on this input.

An alarm will be initiated immediately after the

loop is determined to be open, but will not

retrigger an alarm if the loop remains open, after

the five minute timeout. This pin is not enabled for

the first 45 seconds after the system is first turned

on.

DLoop (pin 7)

This pin is similar to pin 6, with the one exception

being that the alarm is delayed by 45 seconds to

allow time for entry or exit.

VSS (pin 8)

Circuit common is connected to this pin. This is

the most negative point in the circuit.

Ordering Information

These integrated circuits are available in either the 300 mil plastic DIP format, or in the 200 mil SOIC surface

mount type of package. To order, add the appropriate suffix to the part number:

300 mil Plastic DIP............................... ELM365P

200 mil SOIC..................................... ELM365SM

All rights reserved. Copyright ©1999 Elm Electronics.

Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be

given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information

described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these

products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or

systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve

reliability, function, or design.

ELM365DSB

Elm Electronics – Circuits for the Hobbyist

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