MAXIM MAX7500, MAX7501, MAX7502 Technical data

General Description

The MAX7500/MAX7501/MAX7502 temperature sensors accurately measure temperature and provide an over-temperature alarm/interrupt/shutdown output. These devices convert the temperature measurements to digital form using a high-resolution, sigma-delta, analog-to-digital 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 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 over-temperature shutdown output. The MAX7500 features three address select lines, while the MAX7501 and MAX7502 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 I2Ccompatible interface make them ideal for a wide range of applications, including personal computers (PCs), electronic test equipment, and office electronics.

The MAX7500/MAX7501/MAX7502 are available in 8pin 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

♦ I2C Bus Interface

♦ 3.0V to 5.5V Supply Voltage Range

♦ 250µA (typ) Operating Supply Current

♦ 3µA (typ) Shutdown Supply Current

♦ ±2°C (max) from -25°C to +100°C Temperature

Accuracy

♦ 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/MAX7501/MAX7502

Digital Temperature Sensors and Thermal

Watchdog with Bus Lockup Protection

________________________________________________________________ Maxim Integrated Products 1

A2GND

SCL

SDA

MAX7500

µMAX, SO

RESETGND

SCL

SDA

MAX7501 MAX7502

µMAX, SO

TOP VIEW

Pin Configurations

Ordering Information

19-3382; Rev 1; 10/04

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.

PART TEMP RANGE PIN-PACKAGE

MAX7500MSA -55°C to +125°C 8 SO

MAX7500MUA -55°C to +125°C 8 µMAX

MAX7501MSA -55°C to +125°C 8 SO

MAX7501MUA -55°C to +125°C 8 µMAX

MAX7502MSA -55°C to +125°C 8 SO

MAX7502MUA -55°C to +125°C 8 µMAX

Purchase of I2C components from Maxim Integrated Products Inc., or one of its sublicensed Associated Companies, conveys a license under Philips I

C Patent Rights to use these compo-

nents in an I

C system, provided that the system conforms to

the I

C Standard Specification as defined by Philips.

C is a trademark of Philips Corp.

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

查询MAX7500供应商

MAX7500/MAX7501/MAX7502

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

) at any pin exceeds the power supplies (VI< 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

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

+ 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

= +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

PARAMETER

CONDITIONS

UNITS

-25°C ≤ TA ≤ +100°C

Accuracy

-55°C ≤ T

≤ +125°C

°C

Resolution 9 Bits

Conversion Time (Note 6)

I2C inactive

0.5 mA

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

Shutdown mode, +V

= 5V 5

µA

+VS Supply Voltage Range 3.0 5.5 V

OS Output Saturation Voltage I

OUT

= 4.0mA (Note 7) 0.8 V

OS Delay (Note 8) 1 6

Conver-

sions

TOS Default Temperature (Note 9) 80 °C

HYST

Default Temperature (Note 9) 75 °C

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

Input High Voltage V

+VS x

0.7

Input Low Voltage V

+VS x

0.3

Input High Current I

VIN = 5V

1.0 µA

Input Low Current I

VIN = 0V

1.0 µA

Input Capacitance All digital inputs 5 pF

Output High Current VIN = 5V 1 µA

Output Low Voltage IOL = 3mA 0.4 V

SYMBOL

MIN TYP MAX

±2.0

±3.0

100

0.25

0.005

MAX7500/MAX7501/MAX7502

Digital Temperature Sensors and Thermal

Watchdog with Bus Lockup Protection

_______________________________________________________________________________________ 3

Note 4: All parts operate properly over the +VS= 3V to 5V supply voltage range. The devices are tested and specified for rated

accuracy at their nominal supply voltage. Accuracy typically degrades 1°C per volt of change in +V

as it varies from the

nominal value.

Note 5: All parameters are measured at +25°C. Values over the temperature range are guaranteed by design. 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

= 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

SCL

Bus timeout inactive DC 400 kHz

Minimum RESET Pulse Width 1 µs

Bus Free Time Between STOP and START Conditions

BUF

1.3 µs

START Condition Hold Time t

HD:STA

0.6 µs

STOP Condition Setup Time t

SU:STO

90% of SCL to 10% of SDA 100 ns

Clock Low Period t

LOW

1.3 µs

Clock High Period t

HIGH

0.6 µs

START Condition Setup Time t

SU:STA

90% of SCL to 90% of SDA 100 ns

Data Setup Time t

SU:DAT

10% of SDA to 10% of SCL 100 ns

Data Hold Time

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

Maximum Receive SCL/SDA Rise Time

Minimum Receive SCL/SDA Rise Time

(Note 12)

20 +

0.1 x C

Maximum Receive SCL/SDA Fall Time

Minimum Receive SCL/SDA Fall Time

(Note 12)

20 +

0.1 x C

Transmit SDA Fall Time t

(Note 12)

20 +

0.1 x C

250 ns

(Note 13) 0 50 ns

SDA Time Low for Reset of Serial Interface

(Note 14) 150 300 ms

HD:DAT

300

Pulse Width of Suppressed Spike

TIMEOUT

MAX7500/MAX7501/MAX7502

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)

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

0.5

1.0

1.5

2.0

-2.0

MAX7500 toc03

TEMPERATURE (°C)

9565355-25-55 125

4 TYPICAL PARTS

Pin Description

MAX7501

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

2-Wire Interface Address Input. Connect A2 to GND or +V

to set the desired I2C bus

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

C bus and all internal registers to their POR values.

66A1

2-Wire Interface Address Input. Connect A1 to GND or +V

to set the desired I2C bus

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

77A0

2-Wire Interface Address Input. Connect A0 to GND or +V

to set the desired I2C bus

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

88+V

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

Detailed Description

The MAX7500/MAX7501/MAX7502 temperature sensors measure temperature, convert the data into digital form using a sigma-delta ADC, and communicate the conversion results through an I

C-compatible 2-wire serial interface. These devices accept standard I2C commands to read the data, set the over-temperature

alarm (OS) trip thresholds, and configure other characteristics. 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.

MAX7500

MAX7502

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