ELM307 查看數據表（PDF） - Elm Electronics

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ELM307

Camera Control

Elm Electronics 

ELM307

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.

Delay (pin 2)

The logic level at this input pin determines the

minimum time between Camera outputs. A high

level sets a nominal delay of 5 seconds while a low

level gives 1/2 of a second. This delay is provided

to ensure that the camera has time to prepare for

the next picture, before another cycle is allowed.

PW (pin 3)

The digital level at this pin sets the pulse width of

the output at Camera (pin 7). When at a logic low

level, the time will nominally be 1/4 of a second,

while a high level provides 1 second.

PB (pin 4)

This input is to be connected to a momentary action

spst pushbutton switch. Holding the switch closed

for more than 5 seconds will cause the power to

toggle on (if off), or off (if presently on). If the switch

is released after 2 seconds, but before 4 seconds

pass, the mode will toggle between run and test.

Power up is always to the test mode.

While the switch is being pressed, the LED output

will pulse briefly every second, to assist in counting

time. Once a command is acknowledged, a long

LED pulse will be provided so that you know a

change is to occur.

Trigger (pin 5)

A low level at this input initiates one cycle of circuit

operation. The use of a schmitt trigger on the input

means there are no restrictions on the rise or fall

time of the waveform.

If no trigger pulse occurs after 8 minutes in the test

mode or 32 minutes in the run mode, the circuit will

automatically power itself off.

LED (pin 6)

This output is periodically driven to a high level to

show the various states. If in the test mode, LED

will output a double pulse every 4 seconds, while in

the run mode, a single output occurs every 8

seconds. A Camera output will always blank the

LED output, so the LED cannot affect the picture.

Camera (pin 7)

This output is used to control the camera’s shutter.

Usually a transistor provides the actual interface

between the camera and the ELM307 (see the

Example Applications).

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............................... ELM307P

200 mil SOIC..................................... ELM307SM

All rights reserved. Copyright ©2001 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.

ELM307DSA

Elm Electronics – Circuits for the Hobbyist

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