MAX6649MUA Maxim Integrated Products, MAX6649MUA Datasheet

MAX6649MUA

Manufacturer Part Number

MAX6649MUA

Description

Board Mount Temperature Sensors

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6646MUAT.pdf (16 pages)

Specifications of MAX6649MUA

Full Temp Accuracy

+/- 3 C, +/- 3.2 C

Package / Case

uMAX

Digital Output - Bus Interface

Serial (2-Wire)

Digital Output - Number Of Bits

11 bit

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:

MAX6649MUA

Manufacturer:

MAXIM/美信

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX6649MUA+T

Manufacturer:

MAXIM

Quantity:

1 500

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX6649MUA+T

Manufacturer:

AVAGO

Quantity:

5 692

Company:

BOSTOCK HK LIMITED

Part Number:

MAX6649MUA+T

Manufacturer:

MAXIM/PBF

Quantity:

9 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

MAX6649MUA+T

Manufacturer:

MAXIM/美信

Quantity:

20 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX6649MUA-T

Manufacturer:

MAXIM

Quantity:

625

Company:

Meier Automation Equipment Co., Limited

Part Number:

MAX6649MUA-T

Manufacturer:

MAXIM/美信

Quantity:

20 000

Current page: 1 of 16
Download datasheet (174Kb)

The MAX6646/MAX6647/MAX6649 are precise, two-

channel digital temperature sensors. The devices accu-

rately 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 junc-

tion 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 man-

agement bus (SMBus

and receive byte commands to read the temperature

data and to program the alarm thresholds. To enhance

system reliability, the MAX6646/MAX6647/MAX6649

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 MAX6646/MAX6647/MAX6649 provide two system

alarms: ALERT and OVERT. ALERT asserts when any of

four temperature conditions are violated: local overtem-

perature, remote overtemperature, local undertempera-

ture, or remote undertemperature. OVERT asserts when

the temperature 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, at the pro-

grammed conversion rate, or in a single-shot mode. The

adjustable conversion rate allows optimizing supply cur-

rent and temperature update rate to match system needs.

Remote accuracy is ±1°C maximum error between +60°C

and +145°C with no calibration needed. The MAX6646/

MAX6647/MAX6649 operate from -55°C to +125°C, and

measure temperatures between 0°C and +145°C. The

MAX6646/MAX6647/MAX6649 are available in an 8-pin

µMAX

19-2540; Rev 3; 5/07

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.

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

Graphics Processors

Desktop Computers

Notebook Computers

Servers

Thin Clients

Workstations

Test and Measurement

Multichip Modules

package.

+145°C Precision SMBus-Compatible Remote/

Local Sensors with Overtemperature Alarms

________________________________________________________________ Maxim Integrated Products

) write byte, read byte, send byte,

General Description

Applications

♦ Dual Channel: Measures Remote and Local

♦ 0.125°C Resolution

♦ High Accuracy ±1°C (max) from +60°C to +145°C

♦ Measures High-Ideality Thermal Diodes Up to

♦ Two Alarm Outputs: ALERT and OVERT

♦ Programmable Under/Overtemperature Alarm

♦ Programmable Conversion Rate

♦ SMBus-Compatible Interface

♦ SMBus Timeout

Selector Guide, Pin Configurations, and Functional Diagram

appear at end of data sheet.

MAX6646MUA -55°C to +125°C 8 µMAX

MAX6647MUA -55°C to +125°C 8 µMAX

MAX6649MUA -55°C to +125°C 8 µMAX

Temperature

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

(Local)

Temperature Thresholds

PART

+170°C (Apparent)

+145°C (Real)

2200pF

0.1 F

Typical Operating Circuit

DXP

DXN

TEMP RANGE

MAX6646

MAX6647

MAX6649

GND

Ordering Information

200

ALERT

OVERT

SCLK

SDA

3.3V

PIN-

PACKAGE

0°C to +145°C

Features

10k EACH

TEMP RANGE

DATA

CLOCK

TO FAN DRIVER OR

SYSTEM SHUTDOWN

INTERRUPT TO P

MEASURED

Related parts for MAX6649MUA

MAX6649MUA Summary of contents

Page 1

... Programmable Conversion Rate ♦ SMBus-Compatible Interface ♦ SMBus Timeout PART MAX6646MUA -55°C to +125°C 8 µMAX MAX6647MUA -55°C to +125°C 8 µMAX MAX6649MUA -55°C to +125°C 8 µMAX Applications P Selector Guide, Pin Configurations, and Functional Diagram appear at end of data sheet. Features Ordering Information ...

Page 2

Precision SMBus-Compatible Remote/ Local 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 ...

Page 3

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

Page 4

Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms (V = 3.3V +25°C, unless otherwise noted STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 5.0 4.5 4.0 3.5 3.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE ...

Page 5

Precision SMBus-Compatible Remote/ Local 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 ...

Page 6

Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms The DXP-DXN differential input voltage range is 0.25V to 0.95V. Excess resistance in series with the remote diode causes +0.5°C (typ) error per ohm. Remote Temperature Measurement The MAX6646/MAX6647/MAX6649 measure remote ...

Page 7

Precision SMBus-Compatible Remote/ Local 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- ...

Page 8

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

Page 9

Precision SMBus-Compatible Remote/ Local 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 ...

Page 10

Precision SMBus-Compatible Remote/ Local 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 ...

Page 11

Precision SMBus-Compatible Remote/ Local 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 ...

Page 12

Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms Applications Information Remote-Diode Selection The MAX6646/MAX6647/MAX6649 can directly measure the die temperature of CPUs and other ICs that have on-board temperature-sensing diodes (see Typical Operating Circuit), or they can measure the ...

Page 13

Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms GND 10 MILS DXP 10 MILS DXN GND Figure 4. Recommended DXP-DXN PC Traces ADC Noise Filtering The integrating ADC used has good noise rejection for low-frequency signals such as 60Hz/120Hz ...

Page 14

Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms When measuring the temperature of a CPU or other IC with an on-chip sense junction, thermal mass has virtu- ally no effect; the measured temperature of the junction tracks the actual ...

Page 15

Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms EXTERNAL OVERT PART ADDRESS MAX6646 1001 101 MAX6647 1001 110 MAX6649 1001 100 Pin Configuration TOP VIEW DXP 2 7 MAX6646 MAX6647 DXN 3 6 MAX6649 OVERT ...

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 © 2007 Maxim Integrated Products ...

Related keywords

MAX6649MUA datasheet
MAX6649MUA data sheet
MAX6649MUA pdf datasheet
MAX6649MUA component
MAX6649MUA part
MAX6649MUA distributor
MAX6649MUA RoHS
MAX6649MUA datasheet download