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MAX6640_08

更新时间： 2024-09-15 11:15:19
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美信 - MAXIM 风扇控制器
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21页 213K
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2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller

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MAX6640_08 数据手册

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19-3344; Rev 2; 10/08  
2-Channel Temperature Monitor with Dual  
Automatic PWM Fan-Speed Controller  
MAX640  
General Description  
Features  
The MAX6640 monitors its own temperature and one  
external diode-connected transistor or the temperatures  
of two external diode-connected transistors, typically  
available in CPUs, FPGAs, or GPUs. The 2-wire serial  
interface accepts standard System Management Bus  
(SMBusTM) write byte, read byte, send byte, and  
receive byte commands to read the temperature data  
and program the alarm thresholds. Temperature data  
can be read at any time over the SMBus, and three pro-  
grammable alarm outputs can be used to generate  
interrupts, throttle signals, or overtemperature shut-  
down signals.  
o Two Thermal-Diode Inputs  
o Local Temperature Sensor  
o 1°C Remote Temperature Accuracy (+60°C to  
+100°C)  
o Two PWM Outputs for Fan Drive (Open Drain; can  
be Pulled Up to +13.5V)  
o Programmable Fan-Control Characteristics  
o Automatic Fan Spin-Up Ensures Fan Start  
o Controlled Rate-of-Change Ensures Unobtrusive  
Fan-Speed Adjustments  
The temperature data is also used by the internal dual  
PWM fan-speed controller to adjust the speed of up to  
two cooling fans, thereby minimizing noise when the  
system is running cool, but providing maximum cooling  
when power dissipation increases. Speed control is  
accomplished by tachometer feedback from the fan, so  
that the speed of the fan is controlled, not just the PWM  
duty cycle. Accuracy of speed measurement is 4ꢀ.  
o ±±4 Fan-Speed Measurement Accuracy  
o Temperature Monitoring Begins at POR for Fail-  
Safe System Protection  
o OT and THERM Outputs for Throttling or  
Shutdown  
o Measures Temperatures Up to +150°C  
o Tiny 5mm x 5mm 16-Pin TQFN and QSOP  
The MAX6640 is available in 16-pin QSOP and 16-pin  
TQFN 5mm x 5mm packages. It operates from 3.0V to  
3.6V and consumes just 500µA of supply current.  
Packages  
Ordering Information  
Applications  
OPERATING MEASUREMENT PIN-  
PART  
Desktop Computers  
Notebook Computers  
Workstations  
RANGE  
RANGE  
PACKAGE  
-40°C to  
+125°C  
MAX6640AEE+  
MAX6640ATE+  
0°C to +150°C 16 QSOP  
Servers  
-40°C to  
+125°C  
0°C to +150°C 16 TQFN-EP*  
Networking Equipment  
SMBus is a trademark of Intel Corp.  
+Denotes a lead-free/RoHS-compliant package.  
*EP = Exposed pad.  
Typical Operating Circuit appears at end of data sheet.  
Pin Configurations  
TOP VIEW  
+
+
16 15 14 13  
PWM1  
1
2
3
4
5
6
7
8
16 SCL  
15 SDA  
14 ALERT  
13 I.C.  
TACH1  
PWM2  
TACH2  
FANFAIL  
THERM  
OT  
PWM2  
TACH2  
1
12 ALERT  
11 I.C.  
MAX6640  
2
3
4
MAX6640  
FANFAIL  
THERM  
10 DXP2  
12 DXP2  
11 DXN  
10 GND  
9
DXN  
*CONNECT EXPOSED  
PAD TO GND  
5
6
7
8
V
CC  
9
DXP1  
QSOP  
5mm x 5mm THIN QFN  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-±6±2,  
or visit Maxim’s website at www.maxim-ic.com.  
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