MAX6655EVSYS【PDF 1/18 页】EVAL KIT FOR MAX6655

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19-2117; Rev 1; 5/06

Dual Remote/Local Temperature Sensors and

Four-Channel Voltage Monitors

General Description

The MAX6655/MAX6656 are precise voltage and tem-

perature monitors. The digital thermometer reports the

temperature of two remote sensors and its own die tem-

perature. The remote sensors are diode-connected

transistors —typically a low-cost, easily mounted

2N3906 PNP type—that replace conventional thermis-

tors or thermocouples. Remote accuracy is ±1°C for

multiple transistor manufacturers with no calibration

necessary. The remote channels can also measure the

die temperature of other ICs, such as microprocessors,

that contain a substrate-connected PNP with its collec-

tor grounded and its base and emitter available for tem-

perature-sensing purposes. The temperature is

digitized with 11-bit resolution.

The MAX6655/MAX6656 also measure their own supply

voltage and three external voltages with 8-bit resolution.

Each voltage input’s sensitivity is set to give approxi-

mately 3/4-scale output code when the input voltage is

at its nominal value. The MAX6655 operates at +5V

supply and its second voltage monitor is 3.3V. The

MAX6656 operates on a +3.3V supply and its second

voltage monitor is 5V.

The 2-wire serial interface accepts standard SMBus?

Write Byte, Read Byte, Send Byte, and Receive Byte

Features

? Three Temperature Channels

Two Remote PN Junctions

One Local Sensor

? Four Voltage Channels

+12V, +5V, +3.3V, +2.5V

Three External Monitors

One Internal Supply Monitor

? 11-Bit, 0.125°C Resolution

? High Accuracy: ±1°C Over +60°C to +100°C

Temperature Range

? Programmable Under/Over-Threshold Alarms

? Programmable Power-Saving Mode

? No Calibration Required

? SMBus/I 2 C-Compatible Interface

? OVERT Output for Fan Control and System

Shutdown

Ordering Information

commands to program the alarm thresholds and to read

data. The MAX6655/MAX6656 also provide SMBus alert

response and timeout functions. The MAX6655/MAX6656

measure automatically and autonomously, with the con-

version rate programmable. The adjustable rate allows

PART

MAX6655 MEE

MAX6656 MEE

TEMP RANGE

-55°C to +125°C

PIN-

PACKAGE

16 QSOP

PKG

CODE

E16-5

the user to control the supply current.

In addition to the SMBus ALERT output, the MAX6655/

MAX6656 feature an OVERT output, which is used as a

temperature reset that remains active only while the

temperature is above the maximum temperature limit.

The OVERT output is optimal for fan control or for sys-

tem shutdown.

Applications

Typical Application Circuit appears at end of data sheet.

Pin Configuration

TOP VIEW

V CC 1

16 STBY

Notebooks

Workstations

DXP1 2

15 SMBCLK

Thin Clients

Servers

Communication

Equipment

Desktop PC

DXN1 3

ADD0 4

ADD1 5

MAX6655

MAX6656

14 OVERT

13 SMBDATA

12 ALERT

DXP2 6

DXN2 7

11 V IN2

10 V IN1

SMBus is a trademark of Intel Corp .

GND 8

QSOP

V IN3

________________________________________________________________ Maxim Integrated Products

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.

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