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MAX6678

更新时间： 2024-09-16 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
19页 690K
描述
2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller and Five GPIOs

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19-3306; Rev 0; 5/04  
2-Channel Temperature Monitor with Dual Automatic  
PWM Fan-Speed Controller and Five GPIOs  
General Description  
Features  
The MAX6678 monitors its own temperature and the  
temperatures of two external diode-connected transis-  
tors, which typically reside on the die of a CPU or other  
integrated circuit. The device reports temperature values  
in digital form using a 2-wire serial interface. The  
MAX6678 provides a programmable alarm output to gen-  
erate interrupts, throttle signals, or overtemperature shut-  
down signals.  
♦ Two Thermal-Diode Inputs  
♦ Local Temperature Sensor  
♦ Five GPIO Input/Outputs  
♦ Two PWM Outputs for Fan Drive (Open Drain; May  
Be Pulled Up to +5V)  
♦ Programmable Fan-Control Characteristics  
♦ Automatic Fan Spin-Up Ensures Fan Start  
The 2-wire serial interface accepts standard System  
Management Bus (SMBus)™ write byte, read byte, send  
byte, and receive byte commands to read the tempera-  
ture data and program the alarm thresholds. The tem-  
perature 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 maxi-  
mum cooling when power dissipation increases.  
♦ Controlled Rate of Change Ensures Unobtrusive  
Fan-Speed Adjustments  
♦ 1°C Remote Temperature Accuracy (+60°C to  
+145°C)  
♦ Temperature Monitoring Begins at POR for Fail-  
Five GPIO pins provide additional flexibility. The GPIO  
power-up states are set by connecting the GPIO preset  
Safe System Protection  
♦ OT Output for Throttling or Shutdown  
inputs to ground or V  
.
CC  
♦ Four Versions Available, Each with a Different  
The MAX6678 is available in a 20-pin QSOP package  
and a 5mm x 5mm thin QFN package. It operates from  
3.0V to 5.5V and consumes just 500µA of supply current.  
Address  
♦ 5mm x 5mm TQFN Package  
Ordering Information  
Applications  
Desktop Computers  
Notebook Computers  
Workstations  
Servers  
Networking Equipment  
PIN-  
SMBus  
PART  
TEMP RANGE  
PACKAGE ADDRESS  
MAX6678AEP90 -40°C to +125°C 20 QSOP  
MAX6678AEP92 -40°C to +125°C 20 QSOP  
MAX6678AEP94 -40°C to +125°C 20 QSOP  
MAX6678AEP96 -40°C to +125°C 20 QSOP  
1001000  
1001001  
1001010  
1001011  
SMBus is a trademark of Intel Corp.  
Pin Configurations  
20 Thin  
MAX6678ATP90 -40°C to +125°C  
QFN-EP*  
1001000  
1001001  
1001010  
1001011  
20 Thin  
MAX6678ATP92 -40°C to +125°C  
QFN-EP*  
TOP VIEW  
20 19 18 17 16  
20 Thin  
MAX6678ATP94 -40°C to +125°C  
QFN-EP*  
SMBDATA  
SMBCLK  
GPIO4  
1
2
3
4
5
15 OT  
14 GPIO1  
13 GPIO2  
12 GPIO3  
20 Thin  
MAX6678ATP96 -40°C to +125°C  
QFN-EP*  
MAX6678  
PRESET4  
DXP1  
*EP = Exposed paddle.  
*CONNECT EXPOSED  
PADDLE TO GND  
11  
PRESET0  
6
7
8
9
10  
5mm x 5mm THIN QFN  
Typical Operating Circuit appears at end of data sheet.  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ 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.  
1234567...19

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