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Low Cost, 2.7 V to 5.5 V, Micropower
Tem erature Switches in SOT-23
Data Sheet
ADT6501/ADT6502/ADT6503/ADT6504 
 
 
Rev. B 
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rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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FEATURES
?.5癈 (typical) threshold accuracy
Factory-set trip points from
45癈 to +15癈 in 10癈 increments
+35癈 to +115癈 in 10癈 increments
No external components required
Maximum temperature of 125癈
Open-drain output (ADT6501/ADT6503)
Push-pull output (ADT6502/ADT6504)
Pin-selectable hysteresis of 2癈 and 10癈
Supply current of 30 礎 (typical)
Space-saving, 5-lead SOT-23 package
APPLICATIONS
Medical equipment
Automotive
Cell phones
Hard disk drives
Personal computers
Electronic test equipment
Domestic appliances
Process control
FUNCTIONAL BLOCK DIAGRAM
 
Figure 1.
 
GENERAL DESCRIPTION
The ADT6501/ADT6502/ADT6503/ADT6504 are trip point
temperature switches available in a 5-lead SOT-23 package.
Each part contains an internal band gap temperature sensor for
local temperature sensing. When the temperature crosses the
trip point setting, the logic output is activated. The ADT6501/
ADT6503 logic output is active low and open-drain. The
ADT6502/ADT6504 logic output is active high and push-pull.
The temperature is digitized to a resolution of 0.125癈 (11-bit).
The factory trip point settings are 10癈 apart starting from
45癈 to +15癈 for the cold threshold models and from +35癈
to +115癈 for the hot threshold models.
These devices require no external components and typically
consume 30 糀 supply current. Hysteresis is pin-selectable at
2癈 and 10癈. The temperature switch is specified to operate
over the supply range of 2.7 V to 5.5 V.
The ADT6501 and ADT6502 are used for monitoring
temperatures from +35癈 to +115癈 only. Therefore, the logic
output pin becomes active when the temperature goes higher
than the selected trip point temperature.
The ADT6503 and ADT6504 are used for monitoring tempera-
tures from 45癈 to +15癈 only. Therefore, the logic output
pin becomes active when the temperature goes lower than the
selected trip point temperature.
PRODUCT HIGHLIGHTS
1.    ??based temperature measurement gives high accuracy
and noise immunity.
2.    Wide operating temperature range from 55癈 to +125癈.
3.    ?.5癈 typical accuracy from 45癈 to +115癈.
4.    Factory threshold settings from 45癈 to +115癈 in
10癈 increments.
5.    Supply voltage is 2.7 V to 5.5 V.
6.    Supply current of 30 糀.
7.    Space-saving, 5-lead SOT-23 package.
8.    Pin-selectable temperature hysteresis of 2癈 or 10癈.
9.    Temperature resolution of 0.125癈.
2篊/10篊
V
CC
4
GND
1
GND
2
HYST
3
TOVER
5
FACTORY PRESET
TRIP POINT
REGISTER
ADT6501
COMPARATOR
??/DIV>
TEMPERATURE-TO-
DIGITAL CONVERTER
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