Data Sheet
FEATURES
±0.5°C (typical) threshold accuracy
Factory-set trip points from
−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
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
ADT6501
Σ-Δ
TEMPERATURE-TO-
DIGITAL CONVERTER
COMPARATOR
5
TOVER
FACTORY PRESET
TRIP POINT
REGISTER
2ºC/10ºC
1
2
3
06096-001
APPLICATIONS
Medical equipment
Automotive
Cell phones
Hard disk drives
Personal computers
Electronic test equipment
Domestic appliances
Process control
GND
GND
HYST
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°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.
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.
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.
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.
2.
3.
4.
5.
6.
7.
8.
9.
Σ-Δ based temperature measurement gives high accuracy
and noise immunity.
Wide operating temperature range from −55°C to +125°C.
±0.5°C typical accuracy from −45°C to +115°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 SOT-23 package.
Pin-selectable temperature hysteresis of 2°C or 10°C.
Temperature resolution of 0.125°C.
Rev. B
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ADT6501/ADT6502/ADT6503/ADT6504
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution .................................................................................. 4
Pin Configurations and Function Descriptions ........................... 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 8
Circuit Information ...................................................................... 8
Data Sheet
Converter Details ..........................................................................8
Factory-Programmed Threshold Range ....................................8
Hysteresis Input .............................................................................8
Temperature Conversion ..............................................................8
Application Information ................................................................ 10
Thermal Response Time ........................................................... 10
Self-Heating Effects .................................................................... 10
Supply Decoupling ..................................................................... 10
Temperature Monitoring ........................................................... 10
Typical Application Circuits ......................................................... 11
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 13
REVISION HISTORY
9/12—Rev. A to Rev. B
Change to Supply Current Parameter, Table 1 .............................. 3
Updated Outline Dimensions ....................................................... 13
1/08—Rev. 0 to Rev. A
Added ADT6503 and ADT6504....................................... Universal
Changes to Features.......................................................................... 1
Changes to Product Highlights .......................................................1
Changes to Table 1.............................................................................3
Changes to Typical Performance Characteristics .........................6
Changes to Ordering Guide .......................................................... 13
9/07—Revision 0: Initial Version
Rev. B | Page 2 of 16
Data Sheet
SPECIFICATIONS
ADT6501/ADT6502/ADT6503/ADT6504
T
A
= −55°C to +125°C, V
CC
= 2.7 V to 5.5 V, open-drain R
PULL-UP
= 10 kΩ, unless otherwise noted.
Table 1.
Parameter
TEMPERATURE SENSOR AND ADC
Threshold Accuracy
Min
Typ
±0.5
±0.5
±0.5
±0.5
11
30
600
2
10
Max
±6
±4
±4
±6
Unit
°C
°C
°C
°C
Bits
ms
ms
°C
°C
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
R
PULL-UP
= 10 kΩ
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
Test Conditions/Comments
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
HYST pin = 0 V
HYST pin = V
CC
ADC Resolution
Temperature Conversion Time
Update Rate
Temperature Threshold Hysteresis
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 Capacitance, C
OUT 1
DIGITAL OUTPUT (PUSH-PULL)
Output Low Voltage, V
OL
Output High Voltage, V
OH
Output Capacitance, C
OUT1
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
55
Guaranteed by design and characterization.
Rev. B | 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
1
Thermal Impedance
3
θ
JA
, Junction-to-Ambient (Still Air)
IR Reflow Soldering
(RoHS Compliant Package)
Peak Temperature
Time at Peak Temperature
Ramp-Up Rate
Ramp-Down Rate
Time 25°C to Peak Temperature
1
Data Sheet
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 2
)/θ
JA
240°C/W
260°C (+0°C)
20 sec to 40 sec
3°C/sec maximum
−6°C/sec maximum
8 minute 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
CC
+ 0.3 V
20 mA
20 mA
−55°C to +125°C
−65°C to +160°C
150.7°C
0
Figure 2. SOT-23 Maximum Power Dissipation vs. Temperature
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.
ESD CAUTION
Rev. B | Page 4 of 16
Data Sheet
ADT6501/ADT6502/ADT6503/ADT6504
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADT6501/
ADT6502
GND
1
GND
2
HYST
3
TOP VIEW
(Not to Scale)
4
5
ADT6503/
ADT6504
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
Pin Number
ADT6501
1, 2
3
4
5
ADT6502
1, 2
3
4
—
ADT6503
1, 2
3
4
—
ADT6504
1, 2
3
4
—
Mnemonic
GND
HYST
V
CC
TOVER
Description
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
—
—
5
—
—
TOVER
TUNDER
—
—
—
5
TUNDER
Rev. B | Page 5 of 16
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