MAX6654EVKIT【PDF 1/16 页】EVAL KIT FOR MAX6654

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MAX6654

1°C Accurate Remote/Local Temperature

Sensor with SMBus Serial Interface

General Description

The MAX6654 is a precise digital thermometer that

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), Write Byte, Read Byte, Send

Byte, and Receive Byte commands to program the alarm

Features

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

(Remote)

o 11-Bit, 0.125°C Resolution

o Dual Channel: Measures Remote and Local

Temperature

o No Calibration Required

o Programmable Under/Overtemperature Alarms

o I 2 C?-Compatible/SMBus Interface

o +3V to +5.5V Supply Range

Ordering Information

thresholds and to read temperature data. Measurements

can be done automatically and autonomously, with the

PART

TEMP RANGE

PIN-PACKAGE

conversion rate programmed by the user, or programmed

to operate in a single-shot mode. The adjustable conver-

sion 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

MAX6654MEE+ -55 ° C to +125 ° C 16 QSOP

+Denotes a lead(Pb)-free/RoHS-compliant part.

Typical Operating Circuit

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

0.1 μ F

+3.3V SUPPLY

extended resolution register, providing 10-bit-plus-sign

resolution with a 0.125°C LSB. Single-shot conversions

also have 0.125°C per LSB resolution when the conver-

sion rate is 1Hz or slower.

CPU

V CC STBY

MAX6654

DXP SMBCLK

10k EACH

CLOCK

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,

2200pF

DXN

SMBDATA

ALERT

DATA

INTERRUPT TO μ C

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.

Applications

TOP VIEW

ADD0 ADD1

N.C. 1

V CC 2

DXP 3

GND

Pin Configuration

16 N.C.

15 STBY

14 SMBCLK

Desktop Computers

Notebook Computers

Servers

Thin Clients

Workstations

Test and Measurement

Multichip Modules

DXN 4

N.C. 5

ADD1 6

GND 7

GND 8

MAX6654

13 N.C.

12 SMBDATA

11 ALERT

10 ADD0

N.C.

QSOP

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-1836; Rev 4; 6/13

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