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TC654EUN Datasheet

  • TC654EUN

  • Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detect...

  • 36頁

  • MICROCHIP   MICROCHIP

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M
Features
鈥?Temperature Proportional Fan Speed for
Reduced Acoustic Noise and Longer Fan Life
鈥?FanSense鈩?Protects against Fan Failure and
Eliminates the Need for 3-wire Fans
鈥?Over Temperature Detection (TC655)
鈥?Efficient PWM Fan Drive
鈥?Provides RPM Data
鈥?2-Wire SMBus鈩?Compatible Interface
鈥?Supports Any Fan Voltage
鈥?Software Controlled Shutdown Mode for "Green"
Systems
鈥?Supports Low Cost NTC/PTC Thermistors
鈥?Space Saving 10-Pin MSOP Package
鈥?Temperature Range: -40擄C to +85潞C
TC654/TC655
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 V
IN
(Pin 1) represents temperature and is typically pro-
vided by an external thermistor or voltage output tem-
perature sensor. The PWM output (V
OUT
) is adjusted
between 30% and 100%, based on the voltage at V
IN
.
The PWM duty cycle can also be programmed via
SMBus to allow fan speed control without the need for
an external thermistor. If V
IN
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 鈥?鈥?
An over-temperature condition is indicated when the
voltage at V
IN
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 碌A(chǔ) during opera-
tion. The devices can also enter a low-power shutdown
mode (5 碌A(chǔ), typ.) by setting the appropriate bit in the
Configuration Register. The operating temperature
range for these devices is -40擄C to +85潞C.
Dual SMBus鈩?PWM Fan Speed Controllers With
Fan Fault Detection
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Personal Computers & Servers
LCD Projectors
Datacom & Telecom Equipment
Fan Trays
File Servers
Workstations
General Purpose Fan Speed Control
Package Type
10-Pin MSOP
V
IN
C
F
SCLK
SDA
GND
1
2
3
4
5
TC654
TC655
10 V
DD
9
8
7
6
V
OUT
SENSE1
SENSE2
FAULT
SMBus is a trademark of Intel Corporation.
錚?/div>
2002 Microchip Technology Inc.
DS21734A-page 1

TC654EUN 產(chǎn)品屬性

  • 100

  • 集成電路 (IC)

  • PMIC - 電機和風(fēng)扇控制器，驅(qū)動器

  • -

  • 風(fēng)扇控制器，無刷（BLDC）

  • -

  • 1

  • -

  • -

  • 3 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）

  • 10-MSOP

  • 管件

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