MAX6654MEE-T Maxim Integrated Products, MAX6654MEE-T Datasheet

MAX6654MEE-T

Manufacturer Part Number

MAX6654MEE-T

Description

Board Mount Temperature Sensors

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6654MEE.pdf (16 pages)

Specifications of MAX6654MEE-T

Full Temp Accuracy

+/- 5 C

Package / Case

QSOP-16

Digital Output - Bus Interface

Serial (2-Wire, I2C)

Digital Output - Number Of Bits

10 bit + Sign

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

- 55 C

Output Type

Digital

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

MAX6654MEE-T

Manufacturer:

MAXIM/美信

Quantity:

20 000

Current page: 1 of 16
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The MAX6654

reports the temperature of both a remote P-N junction

and its own die. The remote junction can be a diode-con-

nected transistor—typically a low-cost, easily mounted

2N3904 NPN type or 2N3906 PNP type—that replaces

conventional thermistors or thermocouples. Remote

accuracy is ±1°C for multiple transistor manufacturers,

with no calibration needed. The remote junction can also

be a common-collector PNP, such as a substrate PNP of

a microprocessor (µP).

The 2-wire serial interface accepts standard System

Management Bus (SMBus)

Send Byte, and Receive Byte commands to program the

alarm thresholds and to read temperature data.

Measurements can be done automatically and

autonomously, with the conversion rate programmed by

the user, or programmed to operate in a single-shot

mode. The adjustable conversion rate allows the user to

optimize supply current and temperature update rate to

match system needs. When the conversion rate is faster

than 1Hz, the conversion results are available as a 7-bit-

plus-sign byte with a 1°C LSB. When the conversion rate

is 1Hz or slower, the MAX6654 enters the extended

mode. In this mode, 3 additional bits of temperature data

are available in the extended resolution register, provid-

ing 10-bit-plus-sign resolution with a 0.125°C LSB. Single-

shot conversions also have 0.125°C per LSB resolution

when the conversion rate is 1Hz or slower.

A parasitic resistance cancellation (PRC) mode can also

be invoked for conversion rates of 1Hz or slower by set-

ting bit 4 of the configuration register to 1. In PRC mode,

the effect of series resistance on the leads of the external

diode is canceled. The 11-bit conversion in PRC mode is

performed in <500ms and is disabled for conversion

rates faster than 1Hz. The one-shot conversion is also 11

bits in <500ms.

The MAX6654 default low-temperature measurement

limit is 0°C. This can be extended to -64°C by setting bit

5 of the configuration register to 1.

The MAX6654 is available in a small, 16-pin QSOP sur-

face-mount package.

19-1836; Rev 3; 5/06

Ps,

ts.

†

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.

SMBus is a trademark of Intel Corp. .

Desktop Computers

Notebook Computers

Servers

Thin Clients

†

is a precise digital thermometer that

1°C Accurate Remote/Local Temperature

________________________________________________________________ Maxim Integrated Products

General Description

Sensor with SMBus Serial Interface

, Write Byte, Read Byte,

Workstations

Test and Measurement

Multichip Modules

Applications

♦ High Accuracy ±1°C (max) from +70°C to +100°C

♦ 11-Bit, 0.125°C Resolution

♦ Dual Channel: Measures Remote and Local

♦ No Calibration Required

♦ Programmable Under/Overtemperature Alarms

♦ I

♦ +3V to +5.5V Supply Range

MAX6654MEE

(Remote)

Temperature

C™-Compatible/SMBus Interface

TOP VIEW

PART

CPU

2200pF

ADD1

GND

DXN

N.C.

DXP

N.C.

0.1µF

Typical Operating Circuit

-55°C to +125°C

DXN

DXP

TEMP RANGE

ADD0 ADD1

MAX6654

Ordering Information

STBY

MAX6654

QSOP

SMBDATA

SMBCLK

200Ω

Pin Configuration

GND

ALERT

PIN-

PACKAGE

16 QSOP

N.C.

STBY

SMBCLK

N.C.

SMBDATA

ALERT

ADD0

N.C.

+3V TO +5V SUPPLY

Features

10k EACH

CLOCK

DATA

INTERRUPT TO µC

PKG

CODE

E16-1

Related parts for MAX6654MEE-T

MAX6654MEE-T Summary of contents

Page 1

... Resolution ♦ Dual Channel: Measures Remote and Local Temperature ♦ No Calibration Required ♦ Programmable Under/Overtemperature Alarms ♦ C™-Compatible/SMBus Interface ♦ +3V to +5.5V Supply Range PART MAX6654MEE CPU TOP VIEW Applications Features Ordering Information PIN- TEMP RANGE PACKAGE 16 QSOP -55° ...

Page 2

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface ABSOLUTE MAXIMUM RATINGS (All voltages are referenced to GND unless otherwise noted.) V ..........................................................................-0.3V to +6V CC DXP, ADD_ ................................................-0.3V to (VCC + 0.3V) DXN ......................................................................-0.3V to +0.8V ALERT, STBY.. ......................-0.3V ...

Page 3

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface ELECTRICAL CHARACTERISTICS (continued +3V to +5.5V -55°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL Logic Input Low Voltage Logic Input ...

Page 4

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface (V = +3.3V to +5.5V +25°C, unless otherwise noted TEMPERATURE ERROR vs. REMOTE-DIODE TEMPERATURE 2 FAIRCHILD 2N3904 -50 -30 - ...

Page 5

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface PIN NAME 13, 16 N.C. No Connection. Not internally connected. May be used for PC board trace routing. Supply Voltage Input. +3.0V to +5.5V. Bypass to GND with ...

Page 6

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Detailed Description The MAX6654 is a temperature sensor that communi- 2 cates through an SMBus/I C-compatible interface with a µP in thermal-management applications. Essentially an 11-bit serial analog-to-digital converter (ADC) with ...

Page 7

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Figure 1. Functional Diagram _______________________________________________________________________________________ 7 ...

Page 8

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface measure ambient temperature; when measuring local temperature, it senses the temperature of the PC board to which it is soldered. The leads provide a good ther- mal path between the PC ...

Page 9

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface minor improvement in leakage and noise), but try to use them where practical. 8) Keep in mind that copper can’t be used as an EMI shield, and only ferrous materials such ...

Page 10

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Write Byte Format S ADDRESS WR 7 bits Slave Address: equiva- lent to chip-select line of a 3-wire interface Read Byte Format S ADDRESS WR ACK 7 bits Slave Address: equiva- ...

Page 11

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Table 2. Data Format TEMP (°C) ROUNDED TEMP (°C) 130.00 +127 127.00 +127 126.00 +126 25.25 +25 0.50 +1 0.00 0 <0.00 (Note 1) (Normal mode) -1 (Extended temp mode) <-64 ...

Page 12

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Table 4. Read Format for Alert Response Address (0001100) BIT NAME FUNCTION 7 ADD7 (MSB) 6 ADD6 Provide the current MAX6654 5 ADD5 slave address that was latched at 4 ADD4 ...

Page 13

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Table 5. Command-Byte Bit Assignments REGISTER ADDRESS POR STATE RLTS 00h 0000 0000 RRTE 01h 0000 0000 RSL 02h 0000 0000 RCL 03h 0000 0000 RCRA 04h 0000 0010 RLHN 05h ...

Page 14

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Table 7. Status Byte Bit Assignments POR BIT NAME STATE 7 (MSB) BUSY 0 6 LHIGH 0 5 LLOW 0 4 RHIGH 0 3 RLOW 0 2 OPEN ...

Page 15

Accurate Remote/Local Temperature Sensor with SMBus Serial Interface Table 8. Conversion-Rate Control Byte DATA CONVERSION RATE (Hz) 00h 01h 02h 03h 04h 05h 06h 07h 08h-FFh Power-Up Defaults: • Interrupt latch is cleared. • Address select pins are sampled. ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc ...

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