Digital Temperature Sensors and Thermal

Watchdog with Bus Lockup Protection

4

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Typical Operating Characteristics

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

95

65

35

5

-25

240

250

260

270

280

290

300

230

-55

125

1

2

3

4

5

6

0

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

95

65

35

5

-25

-55

125

ACCURACY vs. TEMPERATURE

-1.5

-1.0

-0.5

0

0.5

1.0

1.5

2.0

-2.0

TEMPERATURE (

°C)

95

65

35

5

-25

-55

125

4 TYPICAL PARTS

Pin Description

PIN

MAX7500

MAX7501

MAX7502

NAME

FUNCTION

1

1

SDA

Serial Data Input/Output Line. Open drain. Connect SDA to a pullup resistor.

2

2

SCL

Serial Data Clock Input. Open drain. Connect SCL to a pullup resistor.

3

3

OS

Over-Temperature Shutdown Output. Open drain. Connect OS to a pullup resistor.

4

4

GND

Ground

5

—

A2

address. Do not leave floating. (See Table 1.)

—

5

RESET

Active-Low Reset Input. Pull RESET low for longer than the minimum reset pulse width

to reset the I

66

A1

address. Do not leave floating. (See Table 1.)

77

A0

address. Do not leave floating. (See Table 1.)

88

Positive Supply Voltage Input. Bypass to GND with a 0.1µF bypass capacitor.

Detailed Description

The MAX7500/MAX7501/MAX7502 temperature sen-

sors measure temperature, convert the data into digital

form using a sigma-delta ADC, and communicate the

commands to read the data, set the over-temperature

alarm (OS) trip thresholds, and configure other charac-

teristics. The MAX7500 features three address select

lines (A0, A1, A2) while the MAX7501 and MAX7502

feature two address select lines (A0, A1) and a RESET

input. The MAX7500/MAX7501/MAX7502 operate from

+3.0V to +5.5V supply voltages of and consume 250µA

of supply current.