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MAX6641AUB94+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX6641 temperature sensor and fan controller
accurately measures the temperature of its own die and
the temperature of a remote pn junction. The device
reports temperature values 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)
TM
write byte, read byte,
send byte, and receive byte commands to read the
temperature data and program the alarm thresholds.
The temperature data controls a PWM output signal to
adjust the speed of a cooling fan, thereby minimizing
noise when the system is running cool, but providing
maximum cooling when power dissipation increases.
The device also features an over-temperature alarm
output to generate interrupts, throttle signals, or shut
down signals. The MAX6641 operates from supply volt-
ages in the 3.0V to 5.5V range and typically consumes
500µA of supply current.
The MAX6641 is available in a slim 10-pin µMAX
®
pack-
age and is available over the -40°C to +125°C automo-
tive temperature range.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
Networking Equipment
Industrial
Features
♦ Tiny 3mm x 5mm µMAX Package
♦ Thermal Diode Input
♦ Local Temperature Sensor
♦ Open-Drain PWM Output for Fan Drive
♦ Programmable Fan Control Characteristics
♦ Automatic Fan Spin-Up Ensures Fan Start
♦ ±1°C Remote Temperature Accuracy (+60°C to
+145°C)
♦ Controlled Rate of Change Ensures Unobtrusive
Fan-Speed Adjustments
♦ Temperature Monitoring Begins at Power-On for
Fail-Safe System Protection
♦ OT Output for Throttling or Shutdown
MAX6641
SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3304; Rev 1; 4/06
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.
PART
PIN-
PACKAGE
SMBus
ADDRESS
PKG
CODE
MAX6641AUB90
10 µMAX
1001 000x
U10-2
MAX6641AUB92
10 µMAX
1001 001x
U10-2
MAX6641AUB94
10 µMAX
1001 010x
U10-2
MAX6641AUB96
10 µMAX
1001 011x
U10-2
1
2
3
4
5
10
9
8
7
6
PWMOUT
V
CC
SMBDATA
SMBCLKGND
DXP
DXN
I.C.
MAX6641
µMAX
TOP VIEW
I.C.OT
Pin Configuration
µMAX is a registered trademark of Maxim Integrated Products, Inc.
SMBus is a trademark of Intel Corp.
Typical Application Circuit appears at end of data sheet.
Note: All devices are specified over the -40°C to +125°C tem-
perature range.
MAX6641
SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND.)
V
CC
, OT, SMBDATA, SMBCLK, PWMOUT...............-0.3V to +6V
DXP.........................................................…-0.3V to (V
CC
+ 0.3V)
DXN ......................................................................-0.3V to +0.8V
ESD Protection
(all pins, Human Body Model) ......…………………….±2000V
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) .......... 444mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ............................... +300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Operating Supply Voltage Range
V
CC
3.0 5.5 V
Operating Current SMBDATA, SMBCLK not switching 0.5 1 mA
+25°C ≤ T
R
≤ +125°C,
T
A
= +60°C
±1
0°C ≤ T
R
≤ +145°C,
+25°C ≤ T
A
= ≤ +100°C
±3
External Temperature Error
V
CC
= 3.3V
0°C ≤ T
R
≤ +145°C,
0°C ≤ T
A
≤ +125°C
±4
°C
+25°C ≤ T
A
≤ +100°C -3 +3
Internal Temperature Error
V
CC
= 3.3V
0°C ≤ T
A
≤ +125°C -4 +4
°C
1°C
Temperature Resolution
8 Bits
Conversion Time 200
250
300 ms
PWM Frequency Tolerance -20
+20
%
High level 80
100
120
Remote-Diode Sourcing Current
Low level 8 10 12
µA
DXN Source Voltage 0.7 V
I/O
OT, SMBDATA, PWMOUT Output
Low Voltage
V
OL
I
OUT
= 6mA 0.4 V
OT, SMBDATA, PWMOUT
Output-High Leakage Current
I
OH
V
CC
= 5.5V 1 µA
SMBDATA, SMBCLK Logic-Low
Input Voltage
V
IL
V
CC
= 3V to 5.5V 0.8 V
SMBDATA, SMBCLK Logic-High
Input Voltage
V
IH
V
CC
= 3V to 5.5V 2.1 V
SMBDATA, SMBCLK Leakage
Current
1µA
SMBDATA, SMBCLK Input
Capacitance
C
IN
5pF
MAX6641
SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
_______________________________________________________________________________________ 3
Note 1: Timing specifications guaranteed by design.
Note 2: The serial interface resets when SMBCLK is low for more than t
TIMEOUT
.
Note 3: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
UNITS
SMBus-COMPATIBLE TIMING (Note 1) (See Figures 2, 3)
Serial-Clock Frequency f
SCLK
(Note 2) 100 kHz
Clock Low Period t
LOW
10% to 10% 4 µs
Clock High Period t
HIGH
90% to 90% 4.7 µs
Bus Free Time Between Stop and
Start Condition
t
BUF
4.7 µs
Hold Time After (Repeated) Start
Condition
t
HD:STA
4µs
S M Bus S tar t C ond i ti on S etup Ti m e
t
SU:STA
90% of SMBCLK to 90% of SMBDATA 4.7 µs
Start Condition Hold Time
t
HD:STO
10% of SMBDATA to 10% of SMBCLK 4 µs
Stop Condition Setup Time
t
SU:STO
90% of SMBCLK to 10% of SMBDATA 4 µs
Data Setup Time
t
SU:DAT
10% of SMBDATA to 10% of SMBCLK 250 ns
Data Hold Time
t
HD:DAT
10% of SMBCLK to 10% of SMBDATA
(Note 3)
300 ns
SMBus Fall Time t
F
300 ns
SMBus Rise Time t
R
1000
ns
SMBus Timeout
t
TIMEOUT
29 37 55 ms
Startup Time After POR t
POR
500 ms
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6641 toc01
SUPPLY VOLTAGE (V)
OPERATING SUPPLY CURRENT (µA)
5.04.54.03.5
350
400
450
500
550
600
300
3.0 5.5
NO SMBus ACTIVITY
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6641 toc02
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
1007525 50
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
0125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6641 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
100755025
-1
0
1
2
-2
0125
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX6641AUB94+T

Mfr. #:
Buy MAX6641AUB94+T
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors SMBus-Compatible Temperature Monito
Lifecycle:
New from this manufacturer.
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