MAXIM MAX6509

19-1617; Rev 1b; 9/00
Resistor-Programmable
SOT Temperature Switches
____________________________Features
♦ ±0.5°C Threshold Accuracy
♦ ±4.7°C (max) Threshold Accuracy (-40°C to +125°C)
♦ Temperature Threshold Set by a 1% External
Resistor
♦ Set-Hot or Set-Cold Option
♦ Low 32µA Supply Current
♦ Open-Drain, Push-Pull Outputs;
Open-Drain with Internal Pull-Up Resistor
♦ Pin-Selectable 2°C or 10°C Hysteresis
♦ SOT23 Packages
Ordering Information
________________________Applications
µP Temperature Monitoring in High-Speed
Computers
Temperature Control
Temperature Alarms
Fan Control
Automotive
TEMP. RANGE
PINPACKAGE
TOP
MARK
†MAX6509CAUK-T
-40°C to +125°C
5 SOT23-5
ADNT
MAX6509HAUK-T
-40°C to +125°C
5 SOT23-5
ADNU
MAX6510CAUT-T**
-40°C to +125°C
6 SOT23-6
AAHA
†MAX6510HAUT-T**
-40°C to +125°C
6 SOT23-6
AAHB
PART*
*A minimum order of 2500 pc. is required for SOT packages.
**See Table 1 for selectable output options.
†Contact factory for availability.
Typical Operating Circuit
+2.7V TO +5.5V
Pin Configurations
TOP VIEW
0.1µF
VCC
VCC
SET MAX6509 OUT
MAX6510 (OUT)
RSET
(OUTSET)
GND HYST
5 VCC
SET 1
INT µP
GND 2
MAX6509
SET 1
GND 2
6 VCC
MAX6510
5 OUTSET
GND
GND
4 HYST
OUT 3
SOT23-5
OUT, OUT 3
4 HYST
SOT23-6
( ) ARE FOR MAX6510.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX6509/MAX6510
________________General Description
The MAX6509/MAX6510 are fully integrated, resistorprogrammable temperature switches with thresholds
set by an external resistor. They require only one external resistor to set the temperature threshold within a
wide -40°C to +125°C temperature range. The MAX6509
provides an open-drain output. The MAX6510 features
three selectable output options: active-low, active-high,
and open drain with an internal pull-up resistor.
These switches operate with a +2.7V to +5.5V single
supply while providing a temperature threshold accuracy of ±0.5°C (typ) or ±4.7°C (max). They typically consume 32µA supply current. Hysteresis is pin selectable
to 2°C or 10°C.
The MAX6509/MAX6510 are available in 5-pin and 6-pin
SOT23 packages, respectively.
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
ABSOLUTE MAXIMUM RATINGS
Reference to GND Supply Voltage (VCC).................-0.3V to +6V
OUT (MAX6509) ....................................................-0.3V to +6V
OUT, OUT (MAX6510).............................-0.3V to (VCC + 0.3V)
SET, HYST, OUTSET ..................................-0.3V to (VCC + 0.3V)
Output Current (all pins) .....................................................20mA
Input Current (all pins) ........................................................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
SYMBOL
CONDITIONS
TYP
2.7
VCC
ICC
MIN
∆TTH
Temperature Threshold
Hysteresis
THYST
5.5
V
32
50
OUTSET = GND or VCC (MAX6510)
47
80
µA
µA
97
165
TA = 0°C to +125°C
±0.5
±4.7
TA = -40°C to 0°C
±0.5
±3.7
HYST = GND
2
HYST = VCC
10
µA
VCC - 0.4
VIH
0.4
VIL
OUT Impedance to VCC
OUTSET = unconnected (MAX6510)
60
°C
°C
1
HYST Input Leakage
HYST Input Threshold
UNITS
MAX6509
OUTSET = unconnected, OUT = low
Temperature Threshold
Accuracy
MAX
100
160
VCC - 0.4
V
kΩ
Output Voltage High
VOH
IOUT = 5mA, OUTSET = GND or VCC
Output Voltage Low
VOL
IOUT = 5mA
0.3
V
Open-Drain Output Leakage
Current
IOUT
VOUT = VCC (MAX6509)
10
µA
0.2 · VCC
OUT, active low
OUTSET Voltage
OUTSET Current
VOUTSET
IOUTSET
MAX6510
MAX6510
OUT, active high
0.85 · VCC
OUT, open drain
0.72 · VCC
V
0.55 · VCC
VOUTSET = GND
-5.5
VOUTSET = VCC
5.5
OUTSET = unconnected
Note 1: 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design.
2
V
_______________________________________________________________________________________
µA
±0.1
Resistor-Programmable
SOT Temperature Switches
RSET vs. TEMPERATURE
(TA = -40°C TO 0°C)
SUPPLY CURRENT vs. TEMPERATURE
150
140
VCC = +3.3V
35
30
VCC = +2.7V
25
130
120
110
20
100
RSET = 0
OUTSET = GND (MAX6510)
10
-50
-25
0
25
50
90
75
100
125
-40
-35
-30
-20
-15
-10
-5
TEMPERATURE (°C)
RSET vs. TEMPERATURE
(TA = 0°C TO +125°C)
TRIP THRESHOLD OFFSET vs.
TEMPERATURE
0.20
MAX6509/10 toc03
100
90
0.15
SET POINT OFFSET (°C)
80
70
60
50
40
30
VCC = +2.7V
0.10
0
VCC = +3.3V
VCC = +5V
0.05
0
-0.05
VCC = +3.3V
-0.10
20
10
-0.15
0
-0.20
20
40
60
80
100
120
140
VCC = +2.7V
-50
-25
0
TEMPERATURE (°C)
TRIP POINT ERROR vs.
SET TEMPERATURE
0.8
0.6
RSET
0.4
200ppm
100ppm
0.3
100
HYST = VCC
10
HYSTERESIS (°C)
0.7
0.5
75
125
HYSTERESIS vs. TEMPERATURE
VCC = +5V
1% RSET
SET RESISTOR TEMPCO
0.9
50
12
MAX6509/10 toc05
1.0
25
TEMPERATURE (°C)
MAX6509/10 toc06
0
ERROR (°C)
-25
TEMPERATURE (°C)
MAX6509/10 toc04
15
RSET (kΩ)
MAX6509/10 toc02
VCC = +5V
40
RSET (kΩ)
SUPPLY CURRENT (µA)
45
160
MAX6509/10 toc01
50
8
6
4
HYST = GND
0.2
2
0.1
50ppm
0
0
-40 -25
0
25
50
75
TEMPERATURE (°C)
100
125
-40
-25
0
25
50
75
100
125
TEMPERATURE (°C)
_______________________________________________________________________________________
3
MAX6509/MAX6510
__________________________________________Typical Operating Characteristics
(VCC = +5V, RPULL-UP = 10kΩ (MAX6509 only), TA = +25°C, unless otherwise noted.)
Resistor-Programmable
SOT Temperature Switches
MAX6509/MAX6510
Pin Description
PIN
NAME
FUNCTION
1
SET
Temperature Set Point. Connect an external 1% resistor from SET to GND to set trip point.
2
2
GND
Ground
3
—
OUT
Open-Drain Output. Reset to high impedance during power-on.
—
3
OUT,
OUT
Open-Drain with Internal Pull-Up Resistor, Active-High, or Active-Low Output.
See Table 1. Reset to deassert during power-on.
4
4
HYST
Hysteresis Selection. Hysteresis is 10°C for HYST = VCC, 2°C for HYST = GND.
5
6
VCC
MAX6509
MAX6510
1
—
5
OUTSET
Power-Supply Input
Trilevel Control Input:
OUTSET = VCC sets OUT to active high.
OUTSET = GND sets OUT to active low.
OUTSET = Unconnected sets OUT to open drain with internal pull-up resistor.
Detailed Description
The MAX6509/MAX6510 fully integrated temperature
switches incorporate two temperature-dependent references and one comparator. One reference exhibits a
positive temperature coefficient, and the other has a
negative temperature coefficient. The temperature at
which the two reference voltages are equal determines
the temperature trip point. Pin-selectable 2°C or 10°C
hysteresis keeps the output from oscillating when the
temperature is close to the threshold. The MAX6509
has an active-low, open-drain output structure that can
only sink current. The MAX6510 has three different output options from which to choose (Table 1).
The MAX6509/MAX6510 are programmable for a wide
range of temperature thresholds from -40°C to +125°C.
The temperature threshold is set by an external resistor
between SET and GND. The MAX6509 output easily
interfaces with a microprocessor (µP) reset input
(Figure 2). The MAX6510 output is intended for applications such as driving a fan control switch (Figure 3).
Table 1. OUTSET-Selectable Outputs
4
Hysteresis Input
The HYST pin is a CMOS-compatible input that selects
hysteresis at either a high level (10°C for HYST = VCC)
or a low level (2°C for HYST = GND). Hysteresis prevents the output from oscillating when the temperature
is near the trip point. Do not leave HYST unconnected.
Connect HYST to GND or VCC. Other input voltages
cause increased supply current.
Choose the set-hot temperature (H) or set-cold temperature (C) option to ensure that the trip point is accurate
and the hysteresis is in the right direction. A MAX6509
or MAX6510 with the H suffix will first trip at the correct
point when temperature is increasing. For example, a
MAX6509HAUK-T or MAX6510HAUT-T with its trip point
set to 100°C will assert when its temperature rises
above +100°C, and will not deassert until its temperature drops below +100°C minus the selected hysteresis
value (e.g., +98°C if 2°C hysteresis is chosen). Conversely, if the trip temperature of a MAX6509CAUK-T or
MAX6510CAUT-T is -40°C, the output asserts at
-40°C as temperature falls, and deasserts when temperature rises above -40°C plus the hysteresis value
(e.g., -38°C if 2°C hysteresis is chosen) as shown in
Figure 4.
OUTSET
OUT
Connected to VCC
Active high
Output Selection
Connected to GND
Active low
Unconnected
Open drain with internal
pull-up resistor
The MAX6509 provides an open-drain output. The
MAX6510 features three output options selectable by
OUTSET (Table 1).
_______________________________________________________________________________________
Resistor-Programmable
SOT Temperature Switches
MAX6509/MAX6510
OUT
MAX6509
WITH A PULL-UP RESISTOR
V
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
HYST
NETWORK
HYST
TTH
TEMP
HYSTERESIS*
MAX6509HAUK-T
MAX6510
V
OUT
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
OUTSET = VCC
HYST
NETWORK
HYST
TTH
TEMP
HYSTERESIS*
MAX6510HAUT-T
OUT
MAX6509
WITH A PULL-UP RESISTOR
V
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
HYST
NETWORK
HYST
TEMP
TTH
HYSTERESIS*
MAX6509CAUK-T
MAX6510
OUT
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
HYST
NETWORK
HYST
OUTSET = VCC
MAX6510CAUT-T
TTH
TEMP
HYSTERESIS*
*HYSTERESIS IS 10°C FOR HYST = VCC AND 2°C FOR HYST = GND.
Figure 1. Block and Functional Diagrams
_______________________________________________________________________________________
5
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
+3.3V
+5V
VCC
RPULL-UP
100k
VCC
µP
µP
MAX6509
INT
SHUTDOWN
OR
RESET
OUT
HEAT
VCC
OUTSET
VCC
HYST
HEAT
SET
GND
HYST
SET
MAX6510
GND
FAN
RSET
OUT
RSET
Figure 2. Microprocessor Alarm/Reset
Figure 3. Overtemperature Fan Control
Applications Information
100°C
T THRESHOLD = 65°C
98°C
TEMPERATURE
-38°C
THYST = 2°C
Thermal Considerations
The MAX6509/MAX6510 supply current is typically
32µA. When used to drive high-impedance loads, the
devices dissipate negligible power; therefore, the die
temperature is essentially the same as the package
temperature. The key to accurate temperature monitoring is good thermal contact between the MAX6509/
MAX6510 package and the device being monitored. In
some applications, the SOT23-5 and SOT23-6 packages may be small enough to fit underneath a socketed
µP, allowing the device to monitor the µP’s temperature
directly. Use the monitor’s output to reset the µP, assert
an interrupt, or trigger an external alarm. Accurate temperature monitoring depends on the thermal resistance
between the device being monitored and the
MAX6509/MAX6510 die.
The rise in die temperature due to self-heating is given
by the following formula:
∆TJ = PDISS · θJA
where P DISS is the power dissipated by the
MAX6509/MAX6510, and θJA is the package’s thermal
resistance. The typical thermal resistance is 115°C/W
for the SOT23-6 package. To limit the effects of selfheating, minimize the output currents. For example, if
the MAX6510 sinks 5mA, the output voltage is guaranteed to be less than 0.3V; therefore, an additional
1.5mW of power is dissipated within the IC. This corresponds to a 0.173°C shift in the die temperature in the
SOT23-6.
Temperature-Window Detector
The MAX6509/MAX6510 temperature switch outputs
assert when the die temperature is outside the programmed range. Combining the outputs of a set-cold
6
-40°C
T
THRESHOLD
= -10°C
OUT
SET HOT
MAX6509H
100°C
98°C
OUT
SET COLD
MAX6510C
OUTSET = GND
-40°C
-38°C
Figure 4. Temperature Response
and a set-hot device creates an over/undertemperature
detector. The MAX6509/MAX6510 are designed to form
two complementary pairs, each containing one cold trip
point output and one hot trip point output. The assertion
of either output alerts the system to an out-of-range temperature. The MAX6510 push-pull output stages can be
ORed to produce a thermal out-of-range alarm. More
favorably, a MAX6509HAUK-T and MAX6509CAUK-T
can be directly wire-ORed with a single external resistor to accomplish the same task (Figure 5).
The temperature window (alarms or detectors as in
Figure 5) can be used to accurately determine when a
device’s temperature falls out of a programmed range,
for example -3°C to +75°C as shown in Figure 5. The
thermal overrange signal can be used to assert a ther-
_______________________________________________________________________________________
Resistor-Programmable
SOT Temperature Switches
MAX6509/MAX6510
+5V
+5V
VCC
MAX6510HAUT
GND
VCC
RSET
30k
HYST
OUTSET
MAX6510HAUT
HEAT
OVERTEMP
OUT OF RANGE
HYST
VCC
SET
RSET
30k
µP
OUT
VCC
TEMPERATURE
FAULT
OUT
GND
OUT
VCC
OUTSET
UNDERTEMP
MAX6509CAUT
OUTSET
HYST
SET
GND
VCC
HEAT
VCC
RSET
100k
OUTSET
VCC
MAX6510HAUT
SET
RSET
55k
RPULL-UP
100k
VCC
GND
OUT OF RANGE
Figure 6. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor
VCC
OUT
OUT
HYST
+5V
RSET
30k
FAN
CONTROL
OUT
Set-Point Resistor
MAX6509HAUK
MAX6509CAUK
GND
GND
HYST
SET
HYST
RSET
100k
Figure 5. Temperature-Window Detector
mal shutdown, power-up, recalibration, or other temperature-dependent function.
Low-Cost, Fail-Safe Temperature Monitor
In high-performance/high-reliability applications, multiple temperature monitoring is important. The high-level
integration and low cost of the MAX6509/MAX6510
facilitate the use of multiple temperature monitors to
increase system reliability. Figure 6 shows two
MAX6510s with different temperature thresholds. This
ensures that fault conditions that can overheat the monitored device cause no permanent damage. The first
temperature monitor activates the fan when the die
temperature exceeds +45°C. The second MAX6510
triggers a system shutdown if the die temperature
reaches +75°C. The second temperature monitor’s output asserts when a wide variety of destructive fault conditions occur, including latchups, short circuits, and
cooling-system failures.
To set the trip-point temperature, connect a resistor
between SET and GND. The resistor’s value is determined either from the RSET vs. Temperature graphs
(see Typical Operating Characteristics) or from the
equations below.
To set the temperature trip point from -40°C to 0°C, use
the following equation:
RSET = [(1.3258 · 105) / (T+1.3)] - 310.1693 [(5.7797 · 106) / (T+1.3)2]
To set the temperature trip point from 0°C to +125°C,
use the following equation:
RSET = [(8.3793 · 104) / T] - 211.3569 +
[(1.2989 · 105) / T2]
where T is the trip temperature in Kelvin.
Chip Information
TRANSISTOR COUNT: 234
_______________________________________________________________________________________
7
SOT5L.EPS
________________________________________________________Package Information
6LSOT.EPS
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.