參數(shù)資料
型號(hào)： TC655EUNTR
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO10
封裝： PLASTIC, MSOP-10
文件頁(yè)數(shù)： 1/36頁(yè)
文件大?。?/td> 706K
代理商： TC655EUNTR
2002 Microchip Technology Inc.
DS21734A-page 1
M
TC654/TC655
Features
Temperature Proportional Fan Speed for
Reduced Acoustic Noise and Longer Fan Life
FanSense Protects against Fan Failure and
Eliminates the Need for 3-wire Fans
Over Temperature Detection (TC655)
Efficient PWM Fan Drive
Provides RPM Data
2-Wire SMBus-Compatible Interface
Supports Any Fan Voltage
Software Controlled Shutdown Mode for "Green"
Systems
Supports Low Cost NTC/PTC Thermistors
Space Saving 10-Pin MSOP Package
Temperature Range: -40°C to +85C
Applications
Personal Computers & Servers
LCD Projectors
Datacom & Telecom Equipment
Fan Trays
File Servers
Workstations
General Purpose Fan Speed Control
Package Type
Description
The TC654 and TC655 are PWM mode fan speed con-
trollers with FanSense technology for use with brush-
less DC fans. These devices implement temperature
proportional fan speed control which lowers acoustic
fan noise and increases fan life. The voltage at VIN
(Pin 1) represents temperature and is typically pro-
vided by an external thermistor or voltage output tem-
perature sensor. The PWM output (VOUT) is adjusted
between 30% and 100%, based on the voltage at VIN.
The PWM duty cycle can also be programmed via
SMBus to allow fan speed control without the need for
an external thermistor. If VIN is not connected, the
TC654/TC655 will start driving the fan at a default duty
cycle of 39.33%. See Section 4.3, "Fan Startup", for
more details.
In normal fan operation, pulse trains are present at
SENSE1 (Pin 8) and SENSE2 (Pin 7). The TC654/
TC655 use these pulses to calculate the fan revolu-
tions per minute (RPM). The fan RPM data is used to
detect a worn out, stalled, open or unconnected fan.
An RPM level below the user-programmable threshold
causes the TC654/TC655 to assert a logic low alert
signal (FAULT). The default threshold value is
500 RPM. Also, if this condition occurs, F1F (bit 0<0>)
or F2F (bit 1<0>) in the Status Register will also be set
to a ‘1’.
An over-temperature condition is indicated when the
voltage at VIN exceeds 2.6 V (typical). The TC654/
TC655 devices indicate this by setting OTF(bit 5<X>) in
the Status Register to a '1'. The TC655 device also
pulls the FAULT line low during an over-temperature
condition.
The TC654/TC655 devices are available in a 10-Pin
MSOP package and consume 150 A during opera-
tion. The devices can also enter a low-power shutdown
mode (5 A, typ.) by setting the appropriate bit in the
Configuration Register. The operating temperature
range for these devices is -40°C to +85C.
10-Pin MSOP
1
2
3
4
5
10
9
8
7
6
VIN
CF
SCLK
SDA
GND
VDD
VOUT
SENSE1
SENSE2
FAULT
TC654
TC655
Dual SMBus PWM Fan Speed Controllers With
Fan Fault Detection
SMBus is a trademark of Intel Corporation.
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