MAXIM MAX6509, MAX6510 service manual

MAX6509/MAX6510

Resistor-Programmable

SOT Temperature Switches

________________________________________________________________ Maxim Integrated Products 1

19-1617; Rev 2; 11/03

________________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.

________________________Applications

µP Temperature Monitoring in High-Speed
Computers

Temperature Control
Temperature Alarms
Fan Control
Automotive

____________________________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

Pin ConfigurationsTypical Operating Circuit

*A minimum order of 2500 pc. is required for SOT packages.
**See Table 1 for selectable output options.

TOP

MARK

ADNT

ADNU

AAHA

AAHB6 SOT23-6-40°C to +125°C

MAX6510HAUT-T**

5 SOT23-5-40°C to +125°CMAX6509HAUK-T

6 SOT23-6-40°C to +125°C

MAX6510CAUT-T**

5 SOT23-5

PIN-

PACKAGE

TEMP. RANGE

-40°C to +125°C

MAX6509CAUK-T

PART*

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.

+2.7V TO +5.5V

0.1µF

V

R

SET

( ) ARE FOR MAX6510.

CC

MAX6509

SET

MAX6510

GND

OUT

(OUT)

GND(OUTSET)

HYST

INT

V

µP

GND

CC

TOP VIEW

15SET

MAX6509

2

GND

34

OUT

SOT23-5

V

CC

HYST

SET

16V

MAX6510

2

GND

34

SOT23-6

5

CC

OUTSET

HYSTOUT, OUT

µA

MAX6509/MAX6510

Resistor-Programmable
SOT Temperature Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

CC

= +2.7V to +5.5V, TA= T

MIN

to T

MAX

, 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 (V

CC

).................-0.3V to +6V

OUT (MAX6509) ....................................................-0.3V to +6V

OUT, OUT (MAX6510).............................-0.3V to (V

CC

+ 0.3V)

SET, HYST, OUTSET ..................................-0.3V to (V

CC

+ 0.3V)

Output Current (all pins) .....................................................20mA

Input Current (all pins) ........................................................20mA

Continuous Power Dissipation (T

A

= +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

5.5

±0.1

V

OUTSET

= V

CC

OUTSET = unconnected

OUT, active high

OUT, open drain

V

OUTSET

= GND

OUT, active low

V

OUT

= V

CC

(MAX6509)

I

OUT

= 5mA

I

OUT

= 5mA, OUTSET = GND or V

CC

±0.5 ±3.7

TA= -40°C to 0°C

0.85 · V

CC

0.72 · V

CC

0.55 ·V

CC

V

OUTSET Current I

OUTSET

-5.5

µAMAX6510

OUTSET Voltage V

OUTSET

0.2 · V

CC

MAX6510

HYST Input Threshold

HYST Input Leakage

1

µA

V

IH

VCC- 0.4

V

Output Voltage High V

OH

VCC- 0.4

V

Open-Drain Output Leakage
Current

Output Voltage Low V

OL

0.3

V

I

OUT

10

µA

OUT Impedance to V

CC

V

IL

0.4

60 100 160

kΩOUTSET = unconnected (MAX6510)

Temperature Threshold
Hysteresis

T

HYST

2

°C

10

HYST = GND

HYST = V

CC

Temperature Threshold
Accuracy

Supply Current I

CC

32 50

µA

∆T

TH

±0.5 ±4.7

°C

MAX6509

TA= 0°C to +125°C

PARAMETER SYMBOL MIN TYP MAX UNITS

Supply Voltage Range V

CC

2.7 5.5

V

CONDITIONS

47 80

OUTSET = GND or VCC(MAX6510)

97 165

OUTSET = unconnected, OUT = low

MAX6509/MAX6510

Resistor-Programmable

SOT Temperature Switches

_______________________________________________________________________________________ 3

__________________________________________Typical Operating Characteristics

(VCC= +5V, R

PULL-UP

= 10kΩ (MAX6509 only), TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

50

45

40

35

30

25

SUPPLY CURRENT (µA)

20

15

10

VCC = +3.3V

R

= 0

SET

OUTSET = GND (MAX6510)

-50 0-25 25 50 75 100 125

R

SET

(T

100

90

80

70

60

(kΩ)

50

SET

R

40

30

20

10

0

0 20406080100120140

VCC = +5V

VCC = +2.7V

TEMPERATURE (°C)

vs. TEMPERATURE
= 0°C TO +125°C)

A

TEMPERATURE (°C)

MAX6509/10 toc01

MAX6509/10 toc03

R

vs. TEMPERATURE

SET

= -40°C TO 0°C)

(T

160

150

140

130

(kΩ)

SET

R

120

110

100

90

-40 -30 -25-35 -20 -15 -10 -5 0

A

TEMPERATURE (°C)

TRIP THRESHOLD OFFSET

0.20

0.15

0.10

0.05

0

-0.05

SET POINT OFFSET (°C)

-0.10

-0.15

-0.20

-50 0-25 25 50 75 100 125

vs. TEMPERATURE

VCC = +2.7V

VCC = +3.3V

VCC = +5V

VCC = +3.3V

VCC = +2.7V

TEMPERATURE (°C)

MAX6509/10 toc02

MAX6509/10 toc04

TRIP POINT ERROR

vs. SET TEMPERATURE

1.0

0.9

0.8

0.7

0.6

0.5

0.4

ERROR (°C)

0.3

0.2

0.1

0

-40 -25 0 25 50 75 100 125

VCC = +5V
1% R

SET

SET RESISTOR TEMPCO

200ppm

R

SET

50ppm

TEMPERATURE (°C)

MAX6509/10 toc05

100ppm

HYSTERESIS vs. TEMPERATURE

12

HYST = V

10

8

6

HYSTERESIS (°C)

4

2

0

-40 25 50-25 0 75 100 125

TEMPERATURE (°C)

CC

HYST = GND

MAX6509/10 toc06

MAX6509/MAX6510

Resistor-Programmable
SOT Temperature Switches

4 _______________________________________________________________________________________

Pin Description

2 2 GroundGND

3 — Open-Drain Output. Reset to high impedance during power-on.

OUT

— 3

Open-Drain with Internal Pull-Up Resistor, Active-High, or Active-Low Output.
See Table 1. Reset to deassert during power-on.

4 4 Hysteresis Selection. Hysteresis is 10°C for HYST = VCC, 2°C for HYST = GND.HYST

OUT,

OUT

5 6

Power-Supply Input

— 5

Trilevel Control Input:
OUTSET = VCCsets OUT to active high.
OUTSET = GND sets OUT to active low.
OUTSET = Unconnected sets OUT to open drain with internal pull-up resistor.

OUTSET

V

CC

11 SET Temperature Set Point. Connect an external 1% resistor from SET to GND to set trip point.

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).

Hysteresis Input

The HYST pin is a CMOS-compatible input that selects
hysteresis at either a high level (10°C for HYST = V

CC

)
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.

Output Selection

The MAX6509 provides an open-drain output. The
MAX6510 features three output options selectable by
OUTSET (Table 1).

Table 1. OUTSET-Selectable Outputs

PIN

FUNCTION

MAX6509 MAX6510

NAME

OUTSET OUT

Connected to V

CC

Active high

Connected to GND Active low

Unconnected

Open drain with internal

pull-up resistor

MAX6509/MAX6510

Resistor-Programmable

SOT Temperature Switches

_______________________________________________________________________________________ 5

Figure 1. Block and Functional Diagrams

NEGATIVE

TEMPCO

REFERENCE

NEGATIVE

TEMPCO

REFERENCE

OUTSET = V

NEGATIVE

TEMPCO

REFERENCE

MAX6509

OUT

V

POSITIVE
TEMPCO

REFERENCE

HYST

NETWORK

OUT

HYST

MAX6509HAUK-T

V

OUT

OUT

POSITIVE
TEMPCO

REFERENCE

CC

POSITIVE

TEMPCO

REFERENCE

HYST

NETWORK

MAX6510HAUT-T

HYST

NETWORK

HYST

OUT

HYST

OUT

V

MAX6509CAUK-T

WITH A PULL-UP RESISTOR

T

TH

HYSTERESIS*

MAX6510

T

TH

HYSTERESIS*

MAX6509

WITH A PULL-UP RESISTOR

T

TH

HYSTERESIS*

TEMP

TEMP

TEMP

NEGATIVE

TEMPCO

REFERENCE

POSITIVE
TEMPCO

REFERENCE

OUTSET = V

CC

MAX6510CAUT-T

HYST

NETWORK

*HYSTERESIS IS 10°C FOR HYST = V

OUT

HYST

OUT

AND 2°C FOR HYST = GND.

CC

T

TH

HYSTERESIS*

MAX6510

TEMP

MAX6509/MAX6510

Resistor-Programmable
SOT Temperature Switches

6 _______________________________________________________________________________________

Applications Information

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= P

DISS

· θ

JA

where P

DISS

is the power dissipated by the

MAX6509/MAX6510, and θ

JA

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

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-

Figure 3. Overtemperature Fan Control

Figure 4. Temperature Response

Figure 2. Microprocessor Alarm/Reset

+3.3V

V

CC

µP

INT

SHUTDOWN

OR

RESET

R

PULL-UP

100k

HEAT

OUT

HYST

V

CC

MAX6509

SET

GND

+5V

V

CC

µPFAN

R

SET

TEMPERATURE

-38°C

-40°C

OUT

MAX6509H

OUT

MAX6510C

OUTSET = GND

HEAT

98°C

V

OUTSET SET

CC

MAX6510

HYST

OUTGND

98°C100°C

T THRESHOLD = 65°C100°C

R

SET

THYST = 2°C

THRESHOLD

SET HOT

SET COLD

-38°C-40°C

T

= -10°C

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.

Set-Point Resistor

To set the trip-point temperature, connect a resistor
between SET and GND. The resistor’s value is deter­mined either from the R

SET

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:

R

SET(kΩ)

= [(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:

R

SET(kΩ)

= [(8.3793 · 104) / T] - 211.3569 +

[(1.2989 · 105) / T2]

where T is the trip temperature in Kelvin.

MAX6509/MAX6510

Resistor-Programmable

SOT Temperature Switches

_______________________________________________________________________________________ 7

+5V

Figure 5. Temperature-Window Detector

Figure 6. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor

Chip Information

TRANSISTOR COUNT: 234

V

CC

MAX6510HAUT

GND

HYST

OUTSET

V

CC

MAX6509CAUT

HYST

+5V

V

GND

CC

OUT

OUT

OUTSET

SET

R

SET

30k

OVERTEMP

UNDERTEMP

V

CC

R

SET

100k

R

PULL-UP

100k

OUT OF RANGE

OUT OF RANGE

+5V

V

CC

HEAT

GND

P

µ

HEAT

R
55k

V

CC

HYST

SET

SET

OUTSET

MAX6510HAUT

HYST

OUTSET

MAX6510HAUT

GND

OUT

SET

OUT

V

TEMPERATURE

FAULT

R

SET

30k

FAN

CONTROL

V

CC

CC

V

CC

R

SET

30k

GND

OUT OUT

HYST

GND

V

CC

MAX6509CAUKMAX6509HAUK

SET

HYST

R
100k

SET

MAX6509/MAX6510

Resistor-Programmable
SOT Temperature Switches

________________________________________________________Package Information

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.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

SOT-23 5L .EPS

PACKAGE OUTLINE, SOT-23, 5L

21-0057

PACKAGE OUTLINE, SOT-23, 6L

21-0058

1

E

1

6LSOT.EPS

1

F

1