MAX6648MUA+ Maxim Integrated Products, MAX6648MUA+ Datasheet

MAX6648MUA+

Manufacturer Part Number

MAX6648MUA+

Description

IC SENSOR REMOTE SMBUS 8UMAX

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6692MUAT.pdf (16 pages)

Specifications of MAX6648MUA+

Function

Temp Monitoring System (Sensor)

Topology

ADC, Multiplexer, Register Bank

Sensor Type

External & Internal

Sensing Temperature

0°C ~ 125°C, External Sensor

Output Type

I²C™/SMBus™

Output Alarm

Yes

Output Fan

Yes

Voltage - Supply

3 V ~ 5.5 V

Operating Temperature

-55°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

Full Temp Accuracy

+/- 3 C

Digital Output - Bus Interface

Serial (2-Wire)

Digital Output - Number Of Bits

10 bit + Sign

Maximum Operating Temperature

+ 125 C

Minimum Operating Temperature

0 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Temperature Sensors with Overtemperature Alarms

SMBus is a trademark of Intel Corp.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

The MAX6648/MAX6692 are precise, two-channel digi-

tal temperature sensors. They accurately measure the

temperature of their own die and a remote PN junction,

and report the temperature in digital form using a 2-wire

serial interface. The remote PN junction is typically the

emitter-base junction of a common-collector PNP on a

CPU, FPGA, or ASIC.

The 2-wire serial interface accepts standard System

Management Bus (SMBus)™ write byte, read byte,

send byte, and receive byte commands to read the

temperature data and to program the alarm thresholds.

To enhance system reliability, the MAX6648/MAX6692

include an SMBus timeout. A fault queue prevents the

ALERT and OVERT outputs from setting until a fault has

been detected one, two, or three consecutive times

(programmable).

The MAX6648/MAX6692 provide two system alarms:

ALERT and OVERT. ALERT asserts when any of four tem-

perature conditions are violated: local overtemperature,

remote overtemperature, local undertemperature, or

remote undertemperature. OVERT asserts when the tem-

perature rises above the value in either of the two OVERT

limit registers. The OVERT output can be used to activate

a cooling fan, or to trigger a system shutdown.

Measurements can be done autonomously, with the

conversion rate programmed by the user, or in a single-

shot mode. The adjustable conversion rate allows the

user to optimize supply current and temperature

update rate to match system needs.

Remote accuracy is ±0.8°C maximum error between

+25°C and +125°C with no calibration needed. The

MAX6648/MAX6692 operate from -55°C to +125°C, and

measure temperatures between 0°C and +125°C. The

MAX6648 is available in an 8-pin µMAX

MAX6692 is available in 8-pin µMAX and SO packages.

19-2545; Rev 4; 6/08

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.

Desktop Computers

Notebook Computers

Servers

Thin Clients

Workstations

Test and Measurement

Multichip Modules

Precision SMBus-Compatible Remote/Local

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Maxim Integrated Products

General Description

Applications

package, and the

o Dual Channel Measures Remote and Local

o +0.125°C Resolution

o High Accuracy ±0.8°C (max) from +25°C to +125°C

o Two Alarm Outputs: ALERT and OVERT

o Two Default OVERT Thresholds Available

o Programmable Conversion Rate

o SMBus-Compatible Interface

o SMBus Timeout

o Programmable Under/Overtemperature Alarm

o Compatible with 90nm, 65nm, and 45nm Process

Note: All devices operate over the -55°C to +125°C temperature

range.

Pin Configuration and Functional Diagram appear at end of

data sheet.

MAX6648MUA

MAX6648YMUA

MAX6692MUA

MAX6692MSA

MAX6692YMUA

MAX6692YMSA

Temperature

(Remote), and ±2°C (max) from +60°C to +100°C

(Local)

Thresholds

Technology

MAX6648: +110°C

MAX6692: +85°C

μP

PART

2200pF

0.1μF

DXN

Typical Operating Circuit

DXP

MAX6648

MAX6692

PIN-

PACKAGE

8 µMAX

8 SO

8 µMAX

8 SO

GND

Ordering Information

200Ω

ALERT

OVERT

SCLK

SDA

3.3V

0°C to +125°C

TEMP RANGE

MEASURED

Features

10kΩ EACH

DATA

CLOCK

TO FAN DRIVER OR

SYSTEM SHUTDOWN

INTERRUPTED TO μP

Related parts for MAX6648MUA+

MAX6648MUA+ Summary of contents

Page 1

... Workstations Test and Measurement Multichip Modules SMBus is a trademark of Intel Corp. µMAX is a registered trademark of Maxim Integrated Products, Inc Maxim Integrated Products 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. o Dual Channel Measures Remote and Local Temperature o +0.125° ...

Page 2

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) V ...........................................................................-0.3V to +6V CC DXP.............................................................-0. DXN .......................................................................-0.3V to +0.8V SCLK, SDA, ALERT, OVERT.....................................-0.3V to +6V SDA, ALERT, OVERT Current .............................-1mA to ...

Page 3

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms ELECTRICAL CHARACTERISTICS (continued 3.0V to 5.5V -55°C to +125°C, unless otherwise specified. Typical values are PARAMETER Remote-Diode Source Current ALERT, OVERT Output Low Voltage ...

Page 4

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms (V = 3.3V +25°C, unless otherwise noted STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.0 3.6 3.2 2.8 2.4 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) REMOTE TEMPERATURE ...

Page 5

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms PIN NAME Supply Voltage Input 5.5V. Bypass resistor is recommended but not required for additional noise filtering. Combined Remote-Diode Current Source and A/D Positive Input for ...

Page 6

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms nel. If the remote-diode channel is unused, connect DXP to DXN rather than leaving the pins open. The DXN input is biased to one V an internal diode to prepare the ADC ...

Page 7

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms 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- lent ...

Page 8

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms HIGH LOW SMBCLK SMBDATA t t SU:STA HD:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE ...

Page 9

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 3. Fault Queue Register Bit Definition (22h) POR BIT NAME STATE Reserved. Always write RFU 1 this bit. Reserved. Always write RFU 0 zero to ...

Page 10

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 5. Command-Byte Bit Assignments REGISTER ADDRESS RLTS 00h 0000 0000 RRTE 01h 0000 0000 RSL 02h N/A RCL 03h 0000 0000 RCRA 04h 0000 0111 RLHN 05h 0101 0101 RLLI 06h ...

Page 11

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Table 7. Status Register Bit Assignments (02h) POR BIT NAME STATE 7 (MSB) BUSY 0 A/D is busy converting when 1. Local (internal) high-temperature alarm has tripped when 1; cleared by POR ...

Page 12

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms (actually a transistor). The MAX6648/MAX6692 (not the MAX6648Y/MAX6692Y) are optimized for n = 1.008, which is the typical value for the Intel the AMD Athlon MP model sense transistor ...

Page 13

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms be low enough to alter the effective ideality factor. Good results can be obtained if the process is consis- tent and well behaved. For example, the curve shown in the Remote Temperature ...

Page 14

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms V CC DXP DXN ALERT Q OVERT Q Thermal Mass and Self-Heating When sensing local temperature, these devices are intended to measure the temperature of the PCB to which they are soldered. ...

Page 15

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms Pin Configuration TOP VIEW DXP 2 MAX6648 DXN 3 MAX6692 OVERT 4 μMAX/SO* *SO PACKAGE AVAILABLE FOR MAX6692 ONLY ...

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 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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