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MAX6639F

更新时间： 2024-09-12 04:59:59
品牌 Logo 应用领域
美信 - MAXIM 风扇控制器
页数 文件大小 规格书
22页 203K
描述
2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

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19-3682; Rev 2; 4/08  
2-Channel Temperature Monitor with Dual,  
Automatic, PWM Fan-Speed Controller  
/MAX639F  
General Description  
Features  
ꢀ Two Thermal-Diode Inputs  
The MAX6639 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.  
ꢀ Up to 25kHz PWM Output Frequency  
ꢀ Three Selectable SMBus Addresses  
ꢀ Local Temperature Sensor  
ꢀ 1°C Remote Temperature Accuracy  
ꢀ Two PWM Outputs for Fan Drive (Open Drain; Can  
be Pulled Up to +13.5V)  
ꢀ Programmable Fan-Control Characteristics  
ꢀ Automatic Fan Spin-Up Ensures Fan Start  
ꢀ 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 ±4%.  
ꢀ
3ꢀ Fan-Speed Measurement Accuracy  
ꢀ Temperature Monitoring Begins at POR for Fail-  
Safe System Protection  
ꢀ OT and THERM Outputs for Throttling or  
Shutdown  
ꢀ Measures Temperatures Up to +150°C  
ꢀ MAX6639F is Optimized for n = 1.021 for Penryn  
The MAX6639 is available in 16-pin QSOP and 16-pin thin  
QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V  
and consumes just 500µA of supply current.  
Compatability  
Ordering Information  
Applications  
OPERATING MEASUREMENT PIN-  
PART  
RANGE  
RANGE  
PACKAGE  
Desktop Computers  
Notebook Computers  
Projectors  
-40°C to  
+125°C  
MAX6639AEE  
MAX6639ATE  
MAX6639FAEE+  
0°C to +150°C 16 QSOP  
-40°C to  
+125°C  
16 TQFN-  
0°C to +150°C  
EP*  
Servers  
Networking Equipment  
SMBus is a trademark of Intel Corp.  
-40°C to  
+125°C  
0°C to +150°C 16 QSOP  
+Denotes a lead-free package.  
*EP = Exposed pad.  
Typical Application Circuit appears at end of data sheet.  
Pin Configurations  
TOP VIEW  
12  
11  
10  
9
PWM1  
1
2
3
4
5
6
7
8
16 SCL  
15 SDA  
14 ALERT  
13 ADD  
12 DXP2  
11 DXN  
10 GND  
DXP1  
GND  
SCL  
SDA  
8
7
6
5
13  
14  
15  
16  
TACH1  
PWM2  
TACH2  
FANFAIL  
THERM  
OT  
MAX6639  
MAX6639  
PWM1  
TACH1  
V
CC  
*CONNECT EXPOSED  
PAD TO GND.  
OT  
1
2
3
4
V
CC  
9
DXP1  
QSOP  
THIN QFN  
5 mm x 5 mm  
________________________________________________________________ Maxim Integrated Products  
1
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.  
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