Preliminary Technical Data
FEATURES
±0.5°C (typ) accuracy over temperature range
Factory set trip points from −45°C to +15°C in 10°C
increments
Factory set trip points from +35°C to +115°C in 10°C
increments
No external components required
Max 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
(typ)
Space saving 5-lead SOT23 package
Low Cost, 2.7 V to 5.5 V, Micropower
Temperature Switches in SOT-23
ADT6501/ADT6502/ADT6503/ADT6504
FUNCTIONAL BLOCK DIAGRAM
V
CC
4
DECIMATOR
TEMPERATURE
SENSOR
LPF
1-BIT
12-BIT
+
–
REFERENCE
Σ-Δ
1-BIT
DAC
DIGITAL
COMPARATOR
5
TOVER
CLK AND
TIMING
GENERATION
FACTORY PRESET
TRIP POINT
REGISTER
2°C/10°C
APPLICATIONS
Medical equipment
Automotive
Cell phone
Hard disk drives
Personal computers
Electronic test equipment
Domestic appliances
Process control
1
2
3
GND
GND
HYST
Figure 1.
GENERAL DESCRIPTION
The ADT6501/ADT6502/ADT6503/ADT6504 are trip point
temperature switches available in a 5-lead SOT23 package. It
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 +0.0625°C
(12 bit). The factory 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.
These devices require no external components and typically
consume 30μA 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.
ADT6501 and ADT6502 are used for monitoring temperatures
from +35°C to +115°C only. Hence, 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 temperatures from −45°C to +15°C
only. Hence, the logic output pin becomes active when the
temperature goes lower than the selected trip point
temperature.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
7.
±0.5°C typical from −55°C to +125°C.
Factory threshold settings from −45°C to +115°C in 10°C
increments
Supply voltage is 2.7 V to 5.5 V.
Supply current of 30
μA.
Space-saving 5-lead SOT23 package.
Pin selectable temperature hysteresis of 2°C or 10°C.
Temperature resolution of 0.0625°C.
Rev. PrA
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 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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2006 Analog Devices, Inc. All rights reserved.
06096-001
ADT6501/ADT6502/ADT6503/ADT6504
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Specifications..................................................................................... 3
Absolute Maximum Ratings ....................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 8
Circuit Information...................................................................... 8
Preliminary Technical Data
Converter Details ..........................................................................8
Factory Programmed Threshold Range.....................................8
Hysteresis Input .............................................................................8
Functional Description.................................................................9
Application Information................................................................ 10
Thermal Response Time ........................................................... 10
Self-Heating Effects.................................................................... 10
Supply Decoupling ..................................................................... 10
Temperature Monitoring........................................................... 11
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
Rev. PrA | Page 2 of 16
Preliminary Technical Data
SPECIFICATIONS
ADT6501/ADT6502/ADT6503/ADT6504
T
A
= T
MIN
to T
MAX
, V
DD
= 2.7 V to 5.5 V. All specifications for −45°C to +115°C, unless otherwise noted. Open-drain R
PULL-UP
= 100 kΩ.
Table 1.
Parameter
TEMPERATURE SENSOR AND ADC
Threshold Accuracy at V
CC
= 2.7 V to 5.5 V
Min
Typ
Max
Unit
Test Conditions/Comments
ADC Resolution
Temperature Conversion Time
Update Rate
Long Term Drift
Temperature Hysteresis
Temperature Threshold Hysteresis
±0.5
±0.5
±0.5
±0.5
12
30
600
0.08
+0.03
2
10
±6
±4
±4
±6
°C
°C
°C
°C
Bits
ms
ms
°C
°C
°C
°C
T
A
= −45°C to −25°C
T
A
= −15°C to +15°C
T
A
= +35°C to +65°C
T
A
= +75°C to +115°C
Time necessary to complete a conversion
Conversion started every 600 ms
Drift over 10 years, if part is operated at +55°C
Temperature cycle = 25°C to 125°C to 25°C
DIGITAL INPUT (HYST)
Input Low Voltage, V
IL
Input High Voltage, V
IH
DIGITAL OUTPUT (OPEN-DRAIN)
Output High Current, I
OH
Output Low Voltage, V
OL
Output Low Voltage, V
OL
Output Capacitance, C
OUT 1
DIGITAL OUTPUT (Push-Pull)
Output Low Voltage, V
OL
Output Low Voltage, V
OL
Output High Voltage, V
OH
Output High Voltage, V
OH
Output Capacitance, C
OUT11
POWER REQUIREMENTS
Supply Voltage
Supply Current
1
0.2 × V
CC
0.8 × V
CC
10
0.3
0.4
10
0.3
0.4
0.8 × V
CC
V
CC
– 1.5
10
2.7
30
5.5
85
V
V
nA
V
V
pF
V
V
V
V
pF
V
μA
Leakage current, V
cc
= 2.7 V and V
OH
= 5.5 V
I
OL
= 1.2 mA, V
cc
= 2.7 V
I
OL
= 3.2 mA, V
cc
= 4.5 V
I
OL
= 1.2 mA, V
cc
= 2.7 V
I
OL
= 3.2 mA, V
cc
= 4.5 V
I
SOURCE
= 500
μA,
V
CC
= 2.7 V
I
SOURCE
= 800
μA,
V
CC
= 4.5 V
Guaranteed by design and characterization.
Rev. PrA | Page 3 of 16
ADT6501/ADT6502/ADT6503/ADT6504
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
V
CC
to GND
HYST Input Voltage to GND
Open Drain Output Voltage to GND
Push-Pull Output Voltage to GND
Input Current on All Pins
Output Current on All Pins
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature, T
JMAX
5-Lead SOT-23 (RJ-5)
Power Dissipation
2
Thermal Impedance
4
θ
JA
, Junction-to-Ambient (still air)
IR Reflow Soldering (Pb-Free Package)
Peak Temperature
Time at Peak Temperature
Ramp-Up Rate
Ramp-Down Rate
Time 25°C to Peak Temperature
1
Preliminary Technical Data
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
SOT-23 PD @ 125°C = 0.107W
–55 –40 –20
0
20
40
60
80
100 120
–50 –30 –10
10
30
50
70
90
110 125
TEMPERATURE (°C)
06096-002
W
MAX
= (T
JMAX
− T
A 3
)/θ
JA
240°C/W
260°C (+0°C)
20 sec to 40 sec
3°C/sec maximum
–6°C/sec maximum
8 minutes maximum
MAXIMUM POWER DISSIPATION (W)
Rating
–0.3 V to +7 V
–0.3 V to V
CC
+ 0.3 V
–0.3 V to +7 V
–0.3 V to V
DD
+ 0.3 V
20 mA
20 mA
–55°C to +125°C
–65°C to +160°C
150.7°C
0
Values relate to package being used on a standard 2-layer PCB. This gives a
worst case θ
JA
. Refer to Figure 2 for a plot of maximum power dissipation vs.
ambient temperature (T
A
).
2
T
A
= ambient temperature.
3
Junction-to-case resistance is applicable to components featuring a
preferential flow direction, for example, components mounted on a heat
sink. Junction-to-ambient resistance is more useful for air-cooled, PCB-
mounted components
Figure 2. SOT-23 Maximum Power Dissipation vs. Temperature
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. PrA | Page 4 of 16
Preliminary Technical Data
ADT6501/
ADT6502
GND
1
GND
2
HYST
3
TOP VIEW
(Not to Scale)
4
5
ADT6501/ADT6502/ADT6503/ADT6504
ADT6503/
ADT6504
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
TOVER/
TOVER
06096-003
GND
1
GND
2
HYST
3
TOP VIEW
(Not to Scale)
5
TUNDER/
TUNDER
V
CC
06096-004
V
CC
4
Figure 3. ADT6501/ADT6502 Pin Configuration
Figure 4. ADT6503/ADT6504 Pin Configuration
Table 3. Pin Function Descriptions
ADT6501/ADT6502
Pin No.
1
2
3
4
5
5
–
ADT6503/ADT6504
Pin No.
1
2
3
4
–
–
5
Mnemonic
GND
GND
HYST
V
CC
TOVER/
TOVER
TUNDER/
Description
Ground.
Ground.
Hysteresis Input. Connects HYST to GND for +2°C hysteresis or connects to V
CC
for +10°C hysteresis.
Supply Input (+2.7 V to +5.5 V).
Open-Drain, Active-Low Output. TOVER goes low when the temperature of the
part exceeds the factory programmed threshold; must use a pull-up resistor.
Push-Pull, Active-High Output. TOVER goes high when the temperature of the
part exceeds the factory programmed threshold.
Open-Drain, Active-Low Output. TUNDER goes low when the temperature of
the part exceeds the factory programmed threshold; must use a pull-up
resistor.
Push-Pull, Active-High Output. TUNDER goes high when the temperature of
the part exceeds the factory programmed threshold.
–
5
TUNDER
Rev. PrA | Page 5 of 16
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