Rainbow Electronics MAX6636 User Manual

General description, Applications, Features

General Description

The MAX6636 precision multichannel temperature sen-
sor monitors its own temperature and the temperatures
of up to six external diode-connected transistors. All
temperature channels have programmable alert thresh-
olds. Channels 1, 4, 5, and 6 also have programmable
overtemperature thresholds. When the measured tem-
perature of a channel exceeds the respective thresh-
old, a status bit is set in one of the status registers. Two
open-drain outputs,

OVERT and ALERT, assert corre-

sponding to these bits in the status register.

The 2-wire serial interface supports the standard system
management bus (SMBus™) protocols: write byte, read
byte, send byte, and receive byte for reading the tem-
perature data and programming the alarm thresholds.

The MAX6636 is specified for a -40°C to +125°C oper-
ating temperature range and is available in a 20-pin
TSSOP package.

Applications

Desktop Computers

Notebook Computers

Workstations

Servers

Features

♦ Six Thermal-Diode Inputs
♦ Local Temperature Sensor
♦ 1°C Remote Temperature Accuracy (+60°C to +100°C)
♦ Temperature Monitoring Begins at POR for Fail-

Safe System Protection

♦ ALERT and OVERT Outputs for Interrupts,

Throttling, and Shutdown

♦ STBY Input for Hardware Standby Mode
♦ Small, 20-Pin TSSOP Package
♦ 2-Wire SMBus Interface
♦ Penryn CPU-Compatible
♦ Pin- and Register-Compatible with MAX6689

MAX6636

7-Channel Precision Temperature Monitor

________________________________________________________________

Maxim Integrated Products

Ordering Information

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.

GND

SMBCLK

SMBDATA

DXN2

DXP2

DXN1

DXP1

N.C.

DXN4

DXP4

DXN3

DXP3

DXP6

DXN6

DXN5

DXP5

MAX6636

ALERT

OVERT

STBY

2200pF

CPU

2200pF

GPU

0.1

μF

TO SYSTEM
SHUTDOWN

INTERRUPT
TO

μP

DATA

CLK

+3.3V

4.7k

EACH

Typical Application Circuit

19-3004; Rev 0; 12/07

PART

PIN-
PACKAGE

SLAVE

ADDRESS

PKG CODE

MAX6636UP9A+

20 TSSOP

1001 101

U20-2

SMBus is a trademark of Intel Corp.

Note: Device specified over the -40°C to +125°C temperature
range.

Denotes lead-free package.

Pin Configuration appears at end of data sheet.