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ELM341 데이터시트 PDF




ELM Electronics에서 제조한 전자 부품 ELM341은 전자 산업 및 응용 분야에서
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부품번호 ELM341 기능
기능 LOW POWER THERMOSTAT
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ELM341 데이터시트, 핀배열, 회로
ELM341
Low Power Thermostat
Description
The ELM341 is a complete temperature
measurement and control system in an 8 pin
package. It automatically reverts to a very low power
sleep mode between measurements, making it
suitable for battery operation.
This integrated circuit is designed to compare
two resistances and drive an output pin depending
on the relative value of each. Typically, one of the
resistors will be an NTC thermistor, and the other
one will be a temperature independent resistor
(whether fixed or variable). When the magnitude of
www.DataSheetht4eUre.csoismtance connected to pin 2 exceeds the value
of the resistance connected to pin 3, the output pin
will be driven to a high state. Hysteresis maintains
the output in that state until the relative values differ
by approximately 8% (or typically 2°C for a 10K
thermistor).
To reduce the possibility of sporadic outputs, a
condition must exist for three successive cycles, or 6
seconds, before the output pin can change state.
Applications
• Backup thermostats
• Under or over temperature alarm circuits
Features
• Low power CMOS design
• Wide supply range - 3.0 to 5.5 volt operation
• Built-in proportional hysteresis
• Measurement in progress output
• Time delay on operate improves noise immunity
• Internal pullup resistor on the reset input
• High current drive outputs - up to 25 mA
• Sleep mode reduces power requirements
Connection Diagram
PDIP and SOIC
(top view)
VDD 1
R1 2
R2 3
reset 4
8 VSS
7 Out
6 MIP
5 Cap
Block Diagram
reset 4
2
R1 3
R2
5
VDD
Control
Sleep
Timer
Measurement in Progress (busy)
6 MIP
Overrange
Analog to
Digital
Converter
R1 > R2
3 Consecutive
Measurements
7 Out
ELM341DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM341 pdf, 반도체, 판매, 대치품
ELM341
Example Application
Figure 1 shows the ELM341 in an example heating
control circuit. A closed contact output occurs
whenever the temperature measured by RTEMP falls to
a value less than that determined by RSET. It is
anticipated that this type of circuit could possibly be
used to control temperatures over the range of -40°C
to +40°C.
Power for the control circuit is from a 3V battery,
while the output relay is powered from a 12V supply.
The output relay type is not important, as long as
consideration is given to the coil drive requirements,
and the capabilities of the ELM341. In this example, a
relay with a 400coil resistance was chosen so that a
2N3904 could drive it directly. For further reductions in
www.DataSheectu4rrUen.ct oremquirements, consideration could be given to
using a power MOSFET transistor instead of this
bipolar one.
Temperature measuring is performed by RTEMP,
which is a negative temperature coefficient type
thermistor. It has a resistance of 10Kat 25°C, and
this value decreases with increasing temperature. This
value was chosen both because it is commonly
available, and because it limits the 0.1µF integrating
capacitor currents to less than 1mA over the typical
range of operation (keeping the thermistor self-heating
to a minimum).
If the thermistor is mounted any appreciable
distance from the ELM341, consideration must be
given to cabling effects such as capacitive and induced
currents. Generally the integrated circuit can be
adequately protected by mounting a small value (220)
resistor physically close to the ELM341 as shown
3V
RTEMP
10K
@25°C
see text
1
2
3
4
RSET
18K
8
7
6
5
10K
below. Take into account it’s value when determining
the setpoint, though.
For this design, RSET was selected to be equal to
the resistance of RTEMP at 10°C, so that the relay
contact closes for any measured temperatures less
than 10°C. The resistance value was determined from
specs given by the manufacturer, but could have been
determined experimentally as well.
An LED has been provided for visual feedback of
the circuit operation. It is connected to the
‘measurement in progress’ output, so that it is
energized each time a measurement is being made.
Typically, this would be for about 25mS every 2
seconds.
Current requirements for this entire circuit have
been measured to be about 2µA minimum and 23µA
average, at room temperature and the relay de-
energized, even with the LED blinking. Measurement
times, and thus current consumption, vary with
temperature, so this should only be used as a
guideline. With a 5V supply, these values escalate to
about 8µA and 70µA, respectively.
Just a reminder that consideration must be given
to the fact that the pin 7 output is in a tri-state (open
circuit) mode just prior to making a measurement. This
mode lasts for approximately 300µs, sufficient to
possibly affect some output circuits. It is generally not
sufficient for an electromechanical relay to drop out,
however, especially with a ‘kick-back’ diode across the
coil.
1N4001
1.5K
+12V
12V Relay
To the
heating
control
2N3904
560
LED
0.1µF
Figure 1. Backup Heating Control Thermostat
ELM341DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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부품번호상세설명 및 기능제조사
ELM341

LOW POWER THERMOSTAT

ELM Electronics
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