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

Pin Description

PIN

MAX6509 MAX6510

1

1

2

2

3

—

—

3

4

4

5

6

—

5

NAME

FUNCTION

SET

GND

OUT

OUT,

OUT

HYST

VCC

OUTSET

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

Ground

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

Open-Drain with Internal Pull-Up Resistor, Active-High, or Active-Low Output.

See Table 1. Reset to deassert during power-on.

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

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 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 resis-

tor 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).

Table 1. MAX6510 OUTSET-Selectable

Outputs

OUTSET

OUT

Connected to VCC

Active high

Connected to GND

Active low

Unconnected

Open drain with internal

pull-up resistor

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 tempera-

ture (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 Selection

The MAX6509 provides an open-drain output. The

MAX6510 features three output options selectable by

OUTSET (Table 1).

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