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Part: TC654
Category:
Sensors
-> Temperature Sensors
-> Fan Controllers/Fan Fault Detectors
Description: The TC654 is a Dual PWM Mode Fan Speed Controller With Fansense TM Technology For Use With Brush-less DC Motors
Company: Microchip Technology, Inc.
Datasheet: Download TC654 datasheet File size : 127 kB
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Datasheet text preview:
M
Features
· Tem perature Proportional Fan Speed for Reduced Acoustic Noise and Longer Fan Life · FanSenseTM 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 SMBusTM-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 · Tem perature Range: -40°C to +85ºC
TC654/TC655
Description
The TC654 and TC655 are PWM mode fan speed controllers with FanSense technology for use with brushless 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 provided by an external thermistor or voltage output temperature 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 m ore details. In normal fan operation, pulse trains are present at SE NSE1 (Pin 8) and SENSE2 (Pin 7). The TC654/ TC 655 use these pulses to calculate the fan revolutions 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) or F2F (bit 1) 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) 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 M SO P package and consume 150 µA during operation. The devices can also enter a low-power shutdown m ode (5 µA, typ.) by setting the appropriate bit in the Configuration Register. The operating temperature range for these devices is -40°C to +85ºC.
Dual SMBusTM PWM Fan Speed Controllers With Fan Fault Detection
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 CF SCLK SDA GN D 1 2 3 4 5 TC654 TC655 10 VDD 9 8 7 6 V O UT SENSE1 SENSE2 FAULT
SMBus is a trademark of Intel Corporation.
2002 Microchip Technology Inc.
D S21734A -page 1
TC654/TC655
Functional Block Diagram
TC 654/TC655
VIN VOTF + Note OTF
Control Logic
+ +
VDD
VOUT
CF V MI N
Start-up Timer Missing Pulse Detect
FAULT
Clock Generator
+ SCLK SDA Serial Port Interface
50 k
SENSE1
100 mV (typ.) + 50 k SENSE2
G ND
100 mV (typ.)
Note: OTF condition applies for the TC655 device only.
DS 21734A-page 2
2002 Microchip Technology Inc.
TC654/TC655
1 .0 ELECTRICAL CHARACTERISTICS PIN FUNCTION TABLE
Nam e VIN CF SCLK SDA GND FAULT SENSE2 SENSE1 VOUT VDD Analog Input Analog Output Serial Clock Input Serial Data In/Out (Open Drain) Ground Digital (Open Drain) Output Analog Input Analog Input Digital Output Power Supply Input Function
Absolute Maximum Ratings *
VD D.......... 6.5 V Input Voltages ... - 0.3 V to (VDD + 0.3 V) Output Voltages ......... - 0.3 V to (VDD + 0.3 V) Storage temperature .... -65°C to +150°C Ambient temp. with power applied ....... -40°C to +125°C Maximum Junction Temperature, TJ ..... 150°C ES D protection on all pins ........ 4 kV *Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposur e to maximum rating conditions for extended periods may affect device reliability.
ELECTRICA L SPECIFICATIONS
Electrical Characteristics: Unless otherwise noted, all limits are specified for VDD = 3.0 V to 5.5 V, -40°C 1600 Note 1: Not production tested, ensured by design, tested during characterization. 2: For 5.0 V > V DD 5.5 V, the limit for V IH = 2.2 V. VOL tFAULT -- -- -- 2.4 0.3 -- V sec IOL = 2.5 mA VTHSENSE 80 100 120 mV IIN VC(MAX) VCRANGE 2.45 1.25 -- -1.0 2.6 1.4 10M -- 2.75 1.55 -- +1.0 V V µA VDD = 5.0 V tR tF IOL IOH F -- -- 1. 0 5. 0 26 -- -- -- -- 30 50 50 -- -- 34 µsec µsec mA mA Hz IOH = 5 mA, Note 1 IOL = 1 mA, Note 1 VOL = 10% of V DD VOH = 80% of V DD CF = 1 µ F Sym VDD IDD IDDSHDN Mi n 3. 0 -- -- Typ -- 150 5 Ma x 5.5 300 10 Units V µA µA Pins 7, 8, 9 Open Pins 7, 8, 9 Open Conditions
2002 Microchip Technology Inc.
D S21734A -page 3
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