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ELM380 参数 Datasheet PDF下载

ELM380图片预览
型号: ELM380
PDF下载: 下载PDF文件 查看货源
内容描述: 电池充电器定时器 [BATTERY CHARGER TIMER]
分类和应用: 电池
文件页数/大小: 4 页 / 32 K
品牌: ELM [ ELM ELECTRONICS ]
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ELM380  
Pin Descriptions  
VDD (pin 1)  
8/14 hrs (pin 6)  
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 normally not required.  
Refer to the Electrical Characteristics section for  
further information.  
This input pin selects either an eight hour (if  
high) or a 14 hour (if low) time interval when in  
the quick programming mode. The state of this  
pin is only determined at the end of eight hours.  
start (pin 7)  
A single momentary low on this pin is used to  
initiate a quick programming cycle of either 8 or  
14 hours. Pressing this switch multiple times will  
program the timer for operation with the number  
of hours equal to the number of button presses.  
When there is more than two seconds with no  
switch activity, the circuit will assume that  
programming is complete, and issue a short  
(0.5sec) ‘output off’ to signal the user.  
Out (pin 2), and Out (pin 3)  
These are the two complementary timer outputs.  
During a timing interval, pin 2 will go to a high  
logic level, and pin 3 will go low.  
reset (pin 4)  
This is an active low master reset input. If unused,  
it can be left open circuited (due to the internal  
resistor), or tied to VDD.  
This input also provides an abort function which  
cancels any timing cycle that is in progress, if the  
input is held continuously low for more than  
three seconds. An internal debouncing circuit  
and a pullup resistor are provided on this pin to  
assist with the interface to mechanical switches.  
Clock (pin 5)  
This is the master timekeeping input. Normally a  
60Hz full-wave, positive going signal is applied to  
this Schmitt trigger input. Due to the internal  
clamp diodes, often the only other component  
required is a series connected resistor. Some  
circuit configurations may require a pulldown  
resistor to prevent the possibility of having a  
floating input.  
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............................... ELM380P  
200 mil SOIC..................................... ELM380SM  
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  
ELM380DSB  
Elm Electronics – Circuits for the Hobbyist  
< http://www.elmelectronics.com/ >