Low Cost, 2.7 V to 5.5 V, Micropower
Temperature Switches in SOT-23
ADT6501/ADT6502/ADT6503/ADT6504
FUNCTIONAL BLOCK DIAGRAM
Data Sheet
FEATURES
0.5°C (typical) threshold accuracy
Factory-set trip points from
V
CC
4
ADT6501
−45°C to +15°C in 10°C increments
+35°C to +115°C in 10°C increments
No external components required
Maximum temperature of 125°C
Open-drain output (ADT6501/ADT6503)
Push-pull output (ADT6502/ADT6504)
Pin-selectable hysteresis of 2°C and 10°C
Supply current of 30 µA (typical)
Space-saving, 5-lead SOT-23 package
Σ-Δ
TEMPERATURE-TO-
DIGITAL CONVERTER
COMPARATOR
5
TOVER
FACTORY PRESET
TRIP POINT
REGISTER
2ºC/10ºC
1
2
3
APPLICATIONS
Medical equipment
Automotive
GND
GND
HYST
Figure 1.
Cell phones
Hard disk drives
Personal computers
Electronic test equipment
Domestic appliances
Process control
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°C (11-bit).
The factory trip point settings are 10°C apart starting from
−45°C to +15°C for the cold threshold models and from +35°C
to +115°C for the hot threshold models.
The ADT6503 and ADT6504 are used for monitoring tempera-
tures from −45°C to +15°C only. Therefore, the logic output
pin becomes active when the temperature goes lower than the
selected trip point temperature.
PRODUCT HIGHLIGHTS
1. Σ-Δ based temperature measurement gives high accuracy
and noise immunity.
2. Wide operating temperature range from −55°C to +125°C.
3.
0.5°C typical accuracy from −45°C to +115°C.
4. Factory threshold settings from −45°C to +115°C in
10°C increments.
These devices require no external components and typically
consume 30 μA supply current. Hysteresis is pin-selectable at
2°C and 10°C. The temperature switch is specified to operate
over the supply range of 2.7 V to 5.5 V.
5. Supply voltage is 2.7 V to 5.5 V.
6. Supply current of 30 μA.
The ADT6501 and ADT6502 are used for monitoring
temperatures from +35°C to +115°C only. Therefore, the logic
output pin becomes active when the temperature goes higher
than the selected trip point temperature.
7. Space-saving, 5-lead SOT-23 package.
8. Pin-selectable temperature hysteresis of 2°C or 10°C.
9. Temperature resolution of 0.125°C.
Rev. B
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Tel: 781.329.4700 ©2007–2012 Analog Devices, Inc. All rights reserved.
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