|
|
Part: MAX6641AUB96
Category:
Sensors
-> Temperature Sensors
Description: Smbus-compatible Temperature Monitor With Automatic PWM Fan-speed Controller <<<>>>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 Voltages 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 Package And is Available Over The Automotive Temperature Range (-40 C to +125 C).
Company: Maxim Integrated Products
Datasheet: Download MAX6641AUB96 datasheet File size : 770 kB
Request For quote: Find where to buy MAX6641AUB96
Datasheet text preview:
19-3304; Rev 0; 5/04
SMBus-Compatible Temperature Monitor with Automatic PWM Fan-Speed Controller
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 M a n a g e m e n t Bus (SMBus) TM w r i t e 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 voltages 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® package and is available over the automotive temperature range (-40°C to +125°C). 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
Features
MAX6641
Ordering Information
PART MAX6641AUB90 MAX6641AUB92 MAX6641AUB94 MAX6641AUB96 TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PINPACKAGE 10 µMAX 10 µMAX 10 µMAX 10 µMAX SMBus ADDRESS 1001 000x 1001 001x 1001 010x 1001 011x
Applications
Desktop Computers Notebook Computers Workstations Servers Networking Equipment Industrial
Pin Configuration
TOP VIEW Typical Application Circuit appears at end of data sheet.
I.C. 1 DXN DXP GND OT 2 3 4 5 10 PWMOUT 9 VCC SMBDATA SMBCLK I.C.
MAX6641
8 7 6
µMAX is a registered trademark of Maxim Integrated Products, Inc. SMBus is a trademark of Intel Corp.
µMAX
________________________________________________________________ Maxim Integrated Products
1
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-Compatible Temperature Monitor with Automatic PWM Fan-Speed Controller MAX6641
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND VCC, OT, SMBDATA, SMBCLK, PWMOUT......-0.3V to +6V DXP ...-0.3V to (VCC + 0.3V) DXN ....-0.3V to +0.8V ESD Protection (all pins, Human Body Model) .......±2000V Continuous Power Dissipation (TA = +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
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.
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +5.5V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.)
PARAMETER Operating Supply Voltage Range Operating Current SYMBOL VCC SMBDATA, SMBCLK not switching +25°C TR +125°C, TA = +60°C External Temperature Error VCC = 3.3V 0°C TR +145°C, +25°C TA = +100°C 0°C TR +145°C, 0°C TA +125°C Internal Temperature Error Temperature Resolution Conversion Time PWM Frequency Tolerance Remote-Diode Sourcing Current DXN Source Voltage I/O OT, SMBDATA, PWMOUT Output Low Voltage OT, SMBDATA, PWMOUT Output-High Leakage Current SMBDATA, SMBCLK Logic-Low Input Voltage SMBDATA, SMBCLK Logic-High Input Voltage SMBDATA, SMBCLK Leakage Current SMBDATA, SMBCLK Input Capacitance CIN 5 VOL IOH VIL VIH IOUT = 6mA VCC = 5.5V VCC = 3V to 5.5V VCC = 3V to 5.5V 2.1 1 0.4 1 0.8 V µA V V µA pF High level Low level VCC = 3.3V +25°C TA +100°C 0°C TA +125°C -2.5 -4 1 8 200 -20 80 8 100 10 0.7 250 300 +20 120 12 CONDITIONS MIN 3.0 0.5 TYP MAX 5.5 1 ±1 ±3 ±4 +2.5 +4 °C °C Bits ms % µA V °C UNITS V mA
2
_______________________________________________________________________________________
SMBus-Compatible Temperature Monitor with Automatic PWM Fan-Speed Controller
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +5.5V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.)
PARAMETER Serial Clock Frequency Clock Low Period Clock High Period Bus Free Time Between Stop and Start Condition Hold Time After (Repeated) Start Condition SMBus Start Condition Setup Time Start Condition Hold Time Stop Condition Setup Time Data Setup Time Data Hold Time SMBus Fall Time SMBus Rise Time SMBus Timeout Startup Time After POR SYMBOL fS C L K tL O W t HIGH tBUF tHD:STA tSU:STA tHD:STO tSU:STO tSU:DAT tHD:DAT tF tR tTIMEOUT tPOR 29 37 90% of SMBCLK to 90% of SMBDATA 10% of SMBDATA to 10% of SMBCLK 90% of SMBCLK to 10% of SMBDATA 10% of SMBDATA to 10% of SMBCLK 10% of SMBCLK to 10% of SMBDATA (Note 3) (Note 2) 10% to 10% 90% to 90% 4 4.7 4.7 4 4.7 4 4 250 300 300 1000 55 500 CONDITIONS MIN TYP MAX 100 UNITS kHz µs µs µs µs µs µs µs ns ns ns ns ms ms
MAX6641
SMBus-COMPATIBLE TIMING (Note 1) (See Figures 2, 3)
Note 1: Timing specifications guaranteed by design. Note 2: The serial interface resets when SMBCLK is low for more than tTIMEOUT. Note 3: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK's falling edge.
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
OPERATING SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6641 toc01
REMOTE TEMPERATURE ERROR vs. REMOTE-DIODE TEMPERATURE
1.5 TEMPERATURE ERROR (°C) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2 0 25 50 75 100 125 0
MAX6641 toc02
LOCAL TEMPERATURE ERROR vs. DIE TEMPERATURE
MAX6641 toc03
600 NO SMBus ACTIVITY OPERATING SUPPLY CURRENT (µA) 550 500 450 400 350 300 3.0 3.5 4.0 4.5 5.0
2.0
2
TEMPERATURE ERROR (°C)
1
0
-1
5.5
25
50
75
100
125
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Others parts begin by ma
|
|
|
