參數(shù)資料
型號(hào)： TC655
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(cè)與風(fēng)扇轉(zhuǎn)速控制器
文件頁數(shù)： 9/36頁
文件大小： 706K
代理商： TC655
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
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