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ELM334P 参数 Datasheet PDF下载

ELM334P图片预览
型号: ELM334P
PDF下载: 下载PDF文件 查看货源
内容描述: 车库门童 [GARAGE DOORMAN]
分类和应用:
文件页数/大小: 4 页 / 33 K
品牌: ELM [ ELM ELECTRONICS ]
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ELM334  
Pin Descriptions  
VDD (pin 1)  
Control (pin 5)  
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.  
This output goes to an active high level (VDD), in  
response to a valid low level on pin 4. The  
duration of the output will be the same as the  
input, to a maximum of 500ms. At this point, the  
circuit will assume that the button is ‘stuck’, or  
there has been a wiring fault, and it will turn the  
output off. The state of the RLED and the GLED  
lines is not updated if the circuit thinks that the  
pushbutton is being pressed.  
RLED (pin 2), and GLED (pin 3)  
These two pins are for driving a red and a green  
LED through a current limiting resistance.  
Typically the LED used will be a dual type, that  
appears white if not energized, red if energized  
in one polarity, and green if the polarity is  
reversed. Alternatively, two discrete LEDs could  
be wired ‘back-to-back’. During powerup, the red  
LED will be lit for 0.5sec, followed by the green  
for 0.5sec, and then the circuit will alternate  
between the two for a further 0.5sec.  
ClosedSw (pin 6), and OpenSw (pin 7)  
These two inputs are for monitoring the position  
of the door. This is normally done by connecting  
magnetic reed type switches between each of  
these pins and VSS, with the two switches  
mounted at the extreme positions of the door  
travel. When fully open, only the OpenSw input  
will be at a logic low level (switch closed), and  
when fully closed, only the ClosedSw input will  
be low. Both switches simultaneously open or  
closed will cause the LEDs to alternately flash  
red and green as a warning (or as feedback that  
the door is moving). Internal circuitry provides a  
nominal 0.5sec debounce period on both inputs.  
PB (pin 4)  
A momentary low level signal on this pin will  
cause the control output to go high, after  
approximately 25msec delay due to the internal  
debounce circuitry. If unused, this pin should be  
connected to VDD.  
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............................... ELM334P  
200 mil SOIC..................................... ELM334SM  
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.  
2 of 4  
ELM334DSB  
Elm Electronics – Circuits for the Hobbyist  
< http://www.elmelectronics.com/ >