Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsMAX7500MSA+

General Description

The MAX7500–MAX7504 temperature sensors accu-

rately measure temperature and provide an overtem-

perature alarm/interrupt/shutdown output. These

devices convert the temperature measurements to digi-

tal form using a high-resolution, sigma-delta, analog-to-

digital converter (ADC). Communication is through an

C-compatible 2-wire serial interface. The MAX7500/

MAX7501/MAX7502 integrate a timeout feature that

offers protection against I

C 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

C-com-

patible interface make them ideal for a wide range of

applications, including personal computers (PCs), elec-

tronic 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

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

Ordering Information/

Selector Guide

19-3382; Rev 4; 10/10

EVALUATION KIT

AVAILABLE

PART

TEMP

RANGE

PIN-

PACKAGE

RESET TIMEOUT

MAX7500MSA

-55°C to

+125°C

8 SO X X

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.

MAX7501

MAX7502

MAX7503

MAX7504

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

RESET

GND

SCL

SDA

TO I

C MASTER

4.7kΩ

GND

SCL

SDA

TO I

C MASTER

4.7kΩ

MAX7500

Typical Application Circuits

Summary of content (13 pages)

PAGE 1
9-3382; Rev 4; 10/10 KIT ATION EVALU E L B A IL AVA Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection 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.
PAGE 2
MAX7500–MAX7504 Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection ABSOLUTE MAXIMUM RATINGS (Note 1) +VS to GND ............................................................. -0.3V to +6V OS, SDA, SCL to GND.......................................... -0.3V to +6.0V All Other Pins to GND ................................ -0.3V to (+VS + 0.3V) Input Current at Any Pin (Note 2) ..................................... +5mA Package Input Current (Note 2) .....................................
PAGE 3
Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection (+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 I2C-COMPATIBLE TIMING (Note 10) Serial Clock Frequency fSCL Minimum RESET Pulse Width Bus Free Time Between STOP and START Conditions START Condition Hold Time STOP Condition Setup Time tSU:STO CONDITIONS Bus timeout inactive MIN TYP DC MAX UNITS 400 kHz 1 µs tBUF 1.
PAGE 4
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE +VS = +5V 270 260 +VS = +3V 250 240 230 5 1.0 +VS = +5V 4 3 +VS = +3V 2 -25 5 35 65 95 125 0.5 0 -0.5 -1.0 1 -1.5 0 -55 4 TYPICAL PARTS 1.5 ACCURACY (°C) 280 ACCURACY vs. TEMPERATURE 2.0 MAX7500 toc02 290 6 SHUTDOWN SUPPLY CURRENT (μA) MAX7500 toc01 300 MAX7500 toc03 QUIESCENT SUPPLY CURRENT vs.
PAGE 5
Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection MAX7500–MAX7504 Table 1.
PAGE 6
START BY MASTER START BY MASTER START BY MASTER ADDRESS BYTE ADDRESS BYTE ADDRESS BYTE POINTER BYTE ACK BY MAX7500– MAX7504 REPEAT START BY MASTER ADDRESS BYTE ACK BY MAX7500– MAX7504 ACK BY MAX7500– MAX7504 ACK BY MAX7500– MAX7504 POINTER BYTE POINTER BYTE CONFIGURATION BYTE MOST-SIGNIFICANT DATA BYTE (c) THIGH AND TLOW WRITE ACK BY MAX7500– MAX7504 (b) CONFIGURATION REGISTER WRITE ACK BY MAX7500– MAX7504 ACK BY MAX7500– MAX7504 DATA BYTE LEAST-SIGNIFICANT DATA BYTE STOP COND BY ACK
PAGE 7
_______________________________________________________________________________________ START BY MASTER START BY MASTER START BY MASTER REPEAT START BY MASTER ADDRESS BYTE ADDRESS BYTE ADDRESS BYTE ACK BY MASTER ACK BY MASTER LEAST-SIGNIFICANT DATA BYTE ACK BY MAX7500– MAX7504 POINTER BYTE MOST-SIGNIFICANT DATA BYTE ACK BY MAX7500– MAX7504 ACK BY MASTER DATA BYTE NO ACK BY MASTER (c) TYPICAL 1-BYTE READ FROM CONFIGURATION REGISTER WITH PRESET POINTER.
PAGE 8
MAX7500–MAX7504 Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection Table 2. Register Functions REGISTER NAME ADDRESS (HEX) POR STATE (HEX) POR STATE (BINARY) POR STATE (°C) READ/ WRITE 00 — — — Read only Temperature Configuration 01 00 0000 0000 — R/W THYST 02 4B0 0100 1011 0 75 R/W TOS 03 500 0101 0000 0 80 R/W Table 3.
PAGE 9
Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection MAX7500–MAX7504 Table 5. Configuration Register Definition D7 D6 0 D5 0 D4 0 D3 Fault queue Fault queue Table 6. Configuration Register Fault Queue Bits D4 D3 NO. OF FAULTS 0 0 1 (POR state) 0 1 2 1 0 4 1 1 6 D2 D1 D0 OS polarity Comparator/ interrupt Shutdown TOS TEMPERATURE THYST OS OUTPUT (COMPARATOR MODE) OS SET ACTIVE LOW See Figure 4.
PAGE 10
MAX7500–MAX7504 Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection Shutdown +VS Set bit D0 in the configuration register to 1 to place the MAX7500–MAX7504 in shutdown mode and reduce supply current to 3µA. Power-Up and Power-Down The MAX7500–MAX7504 power up to a known state, as indicated in Table 2.
PAGE 11
Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection Ordering Information/ Selector Guide (continued) Digital Noise The MAX7500–MAX7504 feature an integrated lowpass filter on both the SCL and the SDA digital lines to mitigate the effects of bus noise. Although this filtering makes communication robust in noisy environments, good layout practices are always recommended. Minimize noise coupling by keeping digital traces away from switching power supplies.
PAGE 12
MAX7500–MAX7504 Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 12 PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 13
Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection REVISION NUMBER REVISION DATE 0 8/04 1 10/04 2 DESCRIPTION PAGES CHANGED Initial release of MAX7500 — Initial release of MAX7501/MAX7502 All 6/05 Initial release of MAX7503/MAX7504 All 3 8/08 Various corrections and edits to clarify specifications; added Typical Application Circuits 1–4, 11, 12, 13 4 10/10 Removed the UL certified bullet from the Features section as the parts have never been certified 1 Maxim