MAXIM MAX7504 User Manual

General Description

The MAX7500–MAX7504 temperature sensors accu­rately measure temperature and provide an overtem­perature alarm/interrupt/shutdown output. These
devices convert the temperature measurements to digi­tal form using a high-resolution, sigma-delta, analog-to­digital converter (ADC). Communication is through an
I2C-compatible 2-wire serial interface. The MAX7500/
MAX7501/MAX7502 integrate a timeout feature that
offers protection against I2C bus lockups. The
MAX7503/MAX7504 do not include the timeout feature.

The 2-wire serial interface accepts standard write byte,
read byte, send byte, and receive byte commands to
read the temperature data and configure the behavior
of the open-drain overtemperature shutdown output.

The MAX7500 features three address select lines, while
the MAX7501–MAX7504 feature two address select
lines and a RESET input. The MAX7500/MAX7501/
MAX7502s’ 3.0V to 5.5V supply voltage range, low
250µA supply current, and a lockup-protected I

2

C-com­patible interface make them ideal for a wide range of
applications, including personal computers (PCs), elec­tronic test equipment, and office electronics.

The MAX7500–MAX7504 are available in 8-pin µMAX

®

and SO packages and operate over the -55°C to
+125°C temperature range.

Applications

PCs

Servers

Office Electronics

Electronic Test Equipment

Industrial Process Control

Features

♦ Timeout Prevents Bus Lockup (MAX7500,

MAX7501, MAX7502)

♦ Hardware Reset for Added Protection

♦ I

2

C Bus Interface

♦ 3.0V to 5.5V Supply Voltage Range

♦ 250µA (typ) Operating Supply Current

♦ 3µA (typ) Shutdown Supply Current

♦ ±1.5°C (max) Temperature Accuracy (-25°C to

+100°C, 3-σ)

♦ µMAX, SO Packages Save Space

♦ Separate Open-Drain OS Output Operates as

Interrupt or Comparator/Thermostat Input

♦ Register Readback Capability

♦ Improved LM75 Second Source

MAX7500–MAX7504

Digital Temperature Sensors and Thermal

Watchdog with Bus Lockup Protection

________________________________________________________________

Maxim Integrated Products

1

Ordering Information/

Selector Guide

19-3382; Rev 4; 10/10

EVALUATION KIT

AVAILABLE

Ordering Information/Selector Guide continued at end of
data sheet.

Pin Configurations appear at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.

Typical Application Circuits

PART

MAX7500MSA

TEMP

RANGE

-55°C to
+125°C

PIN­PACKAGE

8 SO X X

RESET TIMEOUT

+3.0V TO +5.5V+3.0V TO +5.5V

TO I

4.7kΩ

2

C MASTER

SDA

SCL

GND

+V

S

A0

MAX7501

OS

MAX7502
MAX7503
MAX7504

A1

RESET

4.7kΩ

+V

SDA

TO I2C MASTER

SCL

GND

OS

MAX7500

S

A0

A1

A2

MAX7500–MAX7504

Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(+VS = +3.0V to +5.5V, TA= -55°C to +125°C, unless otherwise noted. Typical values are at +VS= +3.3V, TA= +25°C.) (Notes 4, 5)

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: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifica-

tions do not apply when operating the device beyond its rated operating conditions.

Note 2: When the input voltage (V

I

) at any pin exceeds the power supplies (VI< V

GND

or VI> + VS), the current at that pin should be
limited to 5mA. The 20mA maximum package input current rating limits the number of pins that can safely exceed the power
supplies with an input current of 5mA to 4.

Note 3: Human Body Model, 100pF discharged through a 1.5kΩ resistor.

(Note 1)
+V

S

to GND ............................................................. -0.3V to +6V

OS, SDA, SCL to GND.......................................... -0.3V to +6.0V

All Other Pins to GND................................ -0.3V to (+V

S

+ 0.3V)

Input Current at Any Pin (Note 2) ..................................... +5mA

Package Input Current (Note 2) ..................................... +20mA

ESD Protection (all pins, Human Body Model, Note 3)... ±2000V
Continuous Power Dissipation (T

A

= +70°C)

8-Pin µMAX (derate 4.5mW/°C above +70°C) ............ 362mW

8-Pin SO (derate 5.9mW/°C above +70°C)................. 471mW

Operating Temperature Range ....................... -55°C to +125°C

Junction Temperature .................................................... +150°C

Storage Temperature Range ........................... -65°C to +150°C

Lead Temperature (soldering, 10s) ............................... +300°C

Soldering Temperature (reflow)

Lead(Pb)-free.............................................................. +260°C

Containing lead(Pb) .................................................... +240°C

Accuracy, 6-σ

Accuracy, 3-σ (Note 5)

Resolution 9 bits

Conversion Time (Note 6) 100 ms

+VS Supply Voltage Range 3.0 5.5 V

OS Output Saturation Voltage I

OS Delay (Note 8) 1 6

TOS Default Temperature (Note 9) 80 °C

T

HYST

LOGIC (SDA, SCL, A0, A1, A2)

Input High Voltage V

Input Low Voltage V

Input High Current I

Input Low Current I

Input Capacitance All digital inputs 5 pF

Output High Current VIN = 5V 1 µA

Output Low Voltage IOL = 3mA 0.4 V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

-25°C ≤ TA ≤ +100°C -2.0 ±2.0

-55°C ≤ T

-25°C ≤ TA ≤ +100°C -1.5 +1.5

-55°C ≤ T

I2C inactive 0.25 0.5 mA

Shutdown mode, +VS = 3V 3Quiescent Supply Current

Shutdown mode, +V

OUT

Default Temperature (Note 9) 75 °C

IH

IL

IH

IL

VIN = 5V 0.005 1.0 µA

VIN = 0V 0.005 1.0 µA

A

A

= 4.0mA (Note 7) 0.8 V

≤ +125°C -3.0 ±3.0

≤ +125°C -2.0 +2.0

= 5V 5

S

+VS x

0.7
+VS x

0.3

°C

°C

µA

Conver-

sions

V

V

MAX7500–MAX7504

Digital Temperature Sensors and Thermal

Watchdog with Bus Lockup Protection

_______________________________________________________________________________________ 3

Note 4: All parameters are measured at +25°C. Values over the temperature range are guaranteed by design.
Note 5: There are no industry-wide standards for temperature accuracy specifications. These values allow comparison to ven-

dors who use 3-σ limits.

Note 6: This specification indicates how often temperature data is updated. The devices can be read at any time without regard

to conversion state, while yielding the last conversion result.

Note 7: For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy due to internal heating.
Note 8: OS delay is user programmable up to six “over-limit” conversions before OS is set to minimize false tripping in noisy

environments.

Note 9: Default values set at power-up.
Note 10: All timing specifications are guaranteed by design.
Note 11: A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s

falling edge.

Note 12: C

B

= total capacitance of one bus line in pF. Tested with CB= 400pF.

Note 13: Input filters on SDA, SCL, and A_ suppress noise spikes less than 50ns.
Note 14: Holding the SDA line low for a time greater than t

TIMEOUT

causes the devices to reset SDA to the IDLE state of the serial

bus communication (SDA set high).

ELECTRICAL CHARACTERISTICS (continued)

(+VS = +3.0V to +5.5V, TA= -55°C to +125°C, unless otherwise noted. Typical values are at +VS= +5V, TA= +25°C.) (Notes 4, 5)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

I2C-COMPATIBLE TIMING (Note 10)

Serial Clock Frequency f
Minimum RESET Pulse Width 1 µs

Bus Free Time Between STOP
and START Conditions

START Condition Hold Time t

STOP Condition Setup Time t

Clock Low Period t

Clock High Period t

START Condition Setup Time t

Data Setup Time t

Data Hold Time t

Maximum Receive SCL/SDA Rise
Time

Minimum Receive SCL/SDA Rise
Time

Maximum Receive SCL/SDA Fall
Time

Minimum Receive SCL/SDA Fall
Time

Transmit SDA Fall Time t

Pulse Width of Suppressed Spike t

SDA Time Low for Reset of Serial
Interface

SCL

t

BUF

HD:STA

SU:STO

LOW

HIGH

SU:STA

SU:DAT

HD:DAT

t

t

t

t

SP

t

TIMEOUT

Bus timeout inactive DC 400 kHz

1.3 µs

0.6 µs

90% of SCL to 10% of SDA 100 ns

1.3 µs

0.6 µs

90% of SCL to 90% of SDA 100 ns

10% of SDA to 10% of SCL 100 ns

10% of SCL to 10% of SDA (Note 11) 0 0.9 µs

R

(Note 12)

R

F

(Note 12)

F

20 +

(Note 12)

F

(Note 13) 0 50 ns

MAX7500/MAX7501/MAX7502 (Note 14) 150 300 ms

0.1 x
C

300 ns

20 +

0.1 x
C

B

300 ns

20 +

0.1 x
C

B

B

250 ns

ns

ns

MAX7500–MAX7504

Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

MAX7500 toc01

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (μA)

9565355-25

240

250

260

270

280

290

300

230

-55 125

+VS = +5V

+VS = +3V

SHUTDOWN SUPPLY CURRENT (μA)

1

2

3

4

5

6

0

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX7500 toc02

TEMPERATURE (°C)

9565355-25-55 125

+VS = +5V

+VS = +3V

ACCURACY vs. TEMPERATURE

ACCURACY (°C)

-1.5

-1.0

-0.5

0

0.5

1.0

1.5

2.0

-2.0

MAX7500 toc03

TEMPERATURE (°C)

9565355-25-55 125

4 TYPICAL PARTS

Pin Description

Detailed Description

The MAX7500–MAX7504 temperature sensors measure
temperature, convert the data into digital form using a
sigma-delta ADC, and communicate the conversion
results through an I2C-compatible 2-wire serial inter­face. These devices accept standard I2C commands to
read the data, set the overtemperature alarm (OS) trip

thresholds, and configure other characteristics. The
MAX7500 features three address select lines (A0, A1,
A2) while the MAX7501–MAX7504 feature two address
select lines (A0, A1) and a RESET input. The
MAX7500–MAX7504 operate from +3.0V to +5.5V sup­ply voltages and consume 250µA of supply current.

PIN

MAX7500

MAX7501–

MAX7504

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 Overtemperature Shutdown Output. Open drain. Connect OS to a pullup resistor.

4 4 GND Ground

5—A2

—5RESET

66A1

77A0

88+V

NAME FUNCTION

2-Wire Interface Address Input. Connect A2 to GND or +V
address. Do not leave unconnected (see Table 1).

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

2

to reset the I

C bus and all internal registers to their POR values.

2-Wire Interface Address Input. Connect A1 to GND or +V
address. Do not leave unconnected (see Table 1).

2-Wire Interface Address Input. Connect A0 to GND or +V
address. Do not leave unconnected (see Table 1).

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

S

to set the desired I2C bus

S

to set the desired I2C bus

S

to set the desired I2C bus

S