MAX6510 データシートの表示（PDF） - Maxim Integrated

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MAX6510

Resistor-Programmable SOT Temperature Switches

Maxim Integrated 

MAX6509/MAX6510

Resistor-Programmable

SOT Temperature Switches

+3.3V

VCC

µP INT

SHUTDOWN

OR

RESET

RPULL-UP

100k

VCC

MAX6509

OUT

SET

HYST

GND

HEAT

RSET

+5V

VCC

VCC

HYST

OUTSET SET

µP

HEAT

MAX6510

RSET FAN

GND OUT

Figure 2. Microprocessor Alarm/Reset

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 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

?P, 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 · θ JA

where PDISS is the power dissipated by the MAX6509/

MAX6510, and qJA is 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 guaranteed to be less than

0.3V; therefore, an additional 1.5mW of power is dissi-

pated 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 pro-

grammed range. Combining the outputs of a set-cold

and a set-hot device creates an over/undertemperature

Figure 3. Overtemperature Fan Control

100°C

98°C

TEMPERATURE

-38°C

-40°C

OUT

MAX6509H

100°C

T THRESHOLD = 65°C

THYST = 2°C

T

THRESHOLD

= -10°C

SET HOT

98°C

OUT

MAX6510C

OUTSET = GND

-40°C

SET COLD

-38°C

Figure 4. Temperature Response

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 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-

mal shutdown, power-up, recalibration, or other tem-

perature-dependent function.

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