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  Microchip Technology Semiconductor Electronic Components Datasheet  

TC654 Datasheet

(TC654 / TC655) PWM Fan Speed Controllers With Fan Fault Detection

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M
TC654/TC655
Dual SMBus™ PWM Fan Speed Controllers With
Fan Fault Detection
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 +85ºC
Applications
• Personal Computers & Servers
• LCD Projectors
• Datacom & Telecom Equipment
• Fan Trays
• File Servers
• Workstations
• General Purpose Fan Speed Control
Package Type
10-Pin MSOP
VIN 1
CF 2
SCLK 3
SDA 4
GND 5
TC654
TC655
10 VDD
9 VOUT
8 SENSE1
7 SENSE2
6 FAULT
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 µA during opera-
tion. The devices can also enter a low-power shutdown
mode (5 µA, typ.) by setting the appropriate bit in the
Configuration Register. The operating temperature
range for these devices is -40°C to +85ºC.
SMBus is a trademark of Intel Corporation.
2002 Microchip Technology Inc.
DS21734A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

TC654 Datasheet

(TC654 / TC655) PWM Fan Speed Controllers With Fan Fault Detection

No Preview Available !

TC654/TC655
Functional Block Diagram
VIN
CF
SCLK
SDA
GND
TC654/TC655
VOTF +
+
+
Note
OTF
Control
Logic
Start-up
Timer
VDD
VOUT
FAULT
VMIN
Clock
Generator
Serial Port
Interface
Missing
Pulse
Detect
50 k
+
100 mV (typ.)
50 k
+
100 mV (typ.)
SENSE1
SENSE2
Note: OTF condition applies for the TC655 device only.
DS21734A-page 2
2002 Microchip Technology Inc.


Part Number TC654
Description (TC654 / TC655) PWM Fan Speed Controllers With Fan Fault Detection
Maker Microchip Technology
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TC654 Datasheet PDF






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