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MAX6510CAUT-T-MAX6510HAUT-T
Resistor-programmable temperature switch.
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches19-1617; Rev 0; 1/00
________________General DescriptionThe MAX6509/MAX6510 are fully integrated, resistor-
programmable temperature switches with thresholds
set by an external resistor. They require only one exter-
nal 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 accura-
cy of ±0.5°C (typ) or ±4.0°C (max). They typically con-
sume 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.
________________________ApplicationsµP Temperature Monitoring in High-Speed
Computers
Temperature Control
Temperature Alarms
Fan Control
Automotive Applications
____________________________Features±0.5°C Threshold Accuracy±4.0°C (max) Threshold Accuracy (-40°C to +125°C)Temperature Threshold Set by a 1% External
ResistorSet-Hot or Set-Cold OptionLow 32µA Supply CurrentOpen-Drain, Push-Pull Outputs;
Open-Drain with Internal Pull-Up Resistor
Pin-Selectable 2°C or 10°C HysteresisSOT23 Packages
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
Note 1:100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by design.
Reference to GND Supply Voltage (VCC).................-0.3V to +6VOUT(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
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
RSET vs. TEMPERATURE
(TA = -40°C TO 0°C)MAX6509/10 toc02
TEMPERATURE (°C)
SET
(k
RSET vs. TEMPERATURE
(TA = 0°C TO +125°C)
MAX6509/10 toc03
TEMPERATURE (°C)
SET
(k
TRIP THRESHOLD OFFSET vs.
TEMPERATURE
MAX6509/10 toc04
TEMPERATURE (°C)
SET POINT OFFSET (
TRIP POINT ERROR vs.
SET TEMPERATURE
MAX6509/10 toc05
TEMPERATURE (°C)
ERROR
(°C)
HYSTERESIS vs. TEMPERATURE
MAX6509/10 toc06
TEMPERATURE (°C)
HYSTERESIS (
°C)
__________________________________________Typical Operating Characteristics(VCC= +5V, RPULL-UP= 10kΩ(MAX6509 only), TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6509/10 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
Pin Description
Detailed Description The MAX6509/MAX6510 fully integrated temperature
switches incorporate two temperature-dependent refer-
ences 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 out-
put 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 applica-
tions such as driving a fan control switch (Figure 3).
Hysteresis InputThe 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 pre-
vents 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 temper-
ature (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 tempera-
ture drops below +100°C minus the selected hysteresis
value (e.g., +98°C if 2°C hysteresis is chosen). Con-
versely, 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 tem-
perature rises above -40°C plus the hysteresis value
(e.g., -38°C if 2°C hysteresis is chosen) as shown in
Figure 4.
Output SelectionThe MAX6509 provides an open-drain output. The
MAX6510 features three output options selectable by
OUTSET (Table 1).
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature SwitchesFigure 1. Block and Functional Diagrams
MAX6509/MAX6510
Resistor-Programmable
SOT Temperature Switches
Applications Information
Thermal ConsiderationsThe 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 monitor-
ing is good thermal contact between the MAX6509/
MAX6510 package and the device being monitored. In
some applications, the SOT23-5 and SOT23-6 pack-
ages 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 tem-
perature 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 PDISSis the power dissipated by the
MAX6509/MAX6510, and θJAis the package’s thermal
resistance. The typical thermal resistance is 115°C/W
for the SOT23-6 package. To limit the effects of self-
heating, minimize the output currents. For example, if
the MAX6510 sinks 5mA, the output voltage is guaran-
teed to be less than 0.3V; therefore, an additional
1.5mW of power is dissipated within the IC. This corre-
sponds to a 0.173°C shift in the die temperature in the
SOT23-6.
Temperature-Window DetectorThe MAX6509/MAX6510 temperature switch outputs
assert when the die temperature is outside the pro-
grammed range. Combining the outputs of a set-cold
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 tem-
perature. 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 resis-
tor 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-
Figure 3. Overtemperature Fan Control
Figure 2. Microprocessor Alarm/Reset
