AD22105 반도체 회로 부품 판매점
Low Voltage/ Resistor Programmable Thermostatic Switch
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 Analog Devices |
a
FEATURES
User-Programmable Temperature Setpoint
2.0؇C Setpoint Accuracy
4.0؇C Preset Hysteresis
Wide Supply Range (+2.7 V dc to +7.0 V dc)
Wide Temperature Range (–40؇C to +150؇C)
Low Power Dissipation (230 W @ 3.3 V)
APPLICATIONS
Industrial Process Control
Thermal Control Systems
CPU Monitoring (i.e., Pentium)
Computer Thermal Management Circuits
Fan Control
Handheld/Portable Electronic Equipment
Low Voltage, Resistor Programmable
Thermostatic Switch
AD22105
FUNCTIONAL BLOCK DIAGRAM
RPULL–UP 1
OUT 2
GND 3
NC 4
AD22105
200kΩ
SET–
POINT
TEMPERATURE
SENSOR
8 NC
7 VS
6 RSET
5 NC
GENERAL DESCRIPTION
The AD22105 is a solid state thermostatic switch. Requiring
only one external programming resistor, the AD22105 can be set
to switch accurately at any temperature in the wide operating
range of –40°C to +150°C. Using a novel circuit architecture,
the AD22105 asserts an open collector output when the ambient
temperature exceeds the user-programmed setpoint temperature.
The AD22105 has approximately 4°C of hysteresis which prevents
rapid thermal on/off cycling.
The AD22105 is designed to operate on a single power supply
voltage from +2.7 V to +7.0 V facilitating operation in battery
powered applications as well as in industrial control systems.
Because of low power dissipation (230 µW @ 3.3 V), self-
heating errors are minimized and battery life is maximized.
An optional internal 200 kΩ pull-up resistor is included to
facilitate driving light loads such as CMOS inputs.
Alternatively, a low power LED indicator may be driven directly.
+2.7V TO +7.0V
87 65
AD22105
TOP VIEW
RSET
OUT
12
34
Figure 1. Typical Application Circuit
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD22105–SPECIFICATIONS (VS = 3.3 V, TA = +25؇C, RLOAD = internal 200 k⍀, unless otherwise noted)
Parameter
Symbol
Conditions
Min Typ Max Units
TEMPERATURE ACCURACY
Ambient Setpoint Accuracy
Temperature Setpoint Accuracy
Power Supply Rejection
ACC
ACCT
PSR
–40°C ≤ TA ≤ +125°C
+2.7 V1 < VS < +7.0 V
± 0.5 ± 2.0
± 3.0
± 0.05 ± 0.15
°C
°C
°C/V
HYSTERESIS
Hysteresis Value
HYS
4.1 °C
OPEN COLLECTOR OUTPUT
Output Low Voltage
VOL
ISINK = 5 mA
250 400 mV
POWER SUPPLY
Supply Range
Supply Current, Output “LOW”
Supply Current, Output “HIGH”
INTERNAL PULL-UP RESISTOR
TURN-ON SETTLING TIME
VS
ISON
ISOFF
RPULL-UP
tON
+2.7 +7.0 V
120 µA
90 µA
140 200 260 kΩ
5 µs
NOTES
1The AD22105 will operate at voltages as low as +2.2 V.
Specifications subject to change without notice.
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
–50
–25
RSET
=
39MΩ °C
––––––––––––———
–
90.3kΩ
TSET (°C) + 281.6 °C
0 25 50 75 100 125 150
SET POINT TEMPERATURE – °C
Figure 2. Setpoint Resistor Values
–2– REV. 0
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