參數(shù)資料
型號： TC654
廠商： Microchip Technology Inc.
英文描述： Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
中文描述： 雙PWM風(fēng)扇的SMBus⑩故障檢測與風(fēng)扇轉(zhuǎn)速控制器
文件頁數(shù)： 9/36頁
文件大?。?/td> 706K
代理商： TC654
2002 Microchip Technology Inc.
DS21734A-page 9
TC654/TC655
4.0
DEVICE OPERATION
The TC654 and TC655 devices allow you to control,
monitor and communicate (via SMBus) fan speed for 2-
wire and 3-wire DC brushless fans. By pulse width
modulating (PWM) the voltage across the fan, the
TC654/TC655 controls fan speed according to the sys-
tem temperature.The goal of temperature proportional
fan speed control is to reduce fan power consumption,
increase fan life and reduce system acoustic noise.
With the TC654 and TC655 devices, fan speed can be
controlled by the analog input V
IN
or the SMBus inter-
face, allowing for high system flexibility.
The TC654 and TC655 also measure and monitor fan
revolutions per minute (RPM). A fan’s speed (RPM) is
a measure of its health. As a fan’s bearings wear out,
the fan slows down and eventually stops (locked rotor).
By monitoring the fan’s RPM level, the TC654/TC655
devices can detect open, shorted, unconnected and
locked rotor fan conditions. The fan speed threshold
can be set to provide a predictive fan failure feature.
This feature can be used to give a system warning and,
in many cases, help to avoid a system thermal shut-
down condition. The fan RPM data and threshold reg-
isters are available over the SMBus interface which
allows for complete system control.
The TC654/TC655 devices are identical in every
aspect except for how they indicate an over-tempera-
ture condition. When V
IN
voltage exceeds 2.6 V (typi-
cal), both devices will set OTF (bit 5<X>) in the Status
Register to a '
1
'. The TC655 will additionally pull the
FAULT output low during an over-temperature condi-
tion.
FIGURE 4-1:
Typical Application Circuit.
1
2
3
4
5
6
7
8
9
10
V
IN
C
F
SCLK
SDA
GND
FAULT
SENSE2
SENSE1
V
OUT
V
DD
+5 V
FAN
1
FAN
2
R
ISO1
R
ISO2
R
SENSE2
R
SENSE1
C
SENSE2
C
SENSE1
NTC Thermistor
100 k
@ 25°C
R
1
R
2
C
1
0.01 μF
C
2
1 μF
PICmicro
Microcontroller
+12 V
+5 V
+5 V
+5 V
+5 V
34.8 k
14.7 k
C
F
1.0 μF
R
SCLK
20 k
R
SDA
20 k
715
0.1 μF
0.1 μF
715
R
FAULT
20 k
Note:
Refer to Table 7-1 for R
SENSE1
and R
SENSE2
values.
TC654/TC655
相關(guān)PDF資料
PDF描述
TC655 Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC665EUN SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC664EUN SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC664 SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC665 SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC654EUN 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
TC654EUNTR 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
TC655 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
TC655EUN 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
TC655EUNTR 功能描述:軟開關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
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