TC654EUN Microchip Technology, TC654EUN Datasheet

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... TC655 SDA 4 5 GND SMBus is a trademark of Intel Corporation. 2002 Microchip Technology Inc. TC654/TC655 Fan Fault Detection 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 ...

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... Note: OTF condition applies for the TC655 device only. DS21734A-page 2 TC654/TC655 – Note V OTF – + OTF + Control + Logic – Start-up Timer Missing Pulse Detect Clock Generator 50 k – Serial Port 100 mV (typ.) Interface 50 k – 100 mV (typ OUT FAULT SENSE1 SENSE2 2002 Microchip Technology Inc. ...

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... FAULT Output LOW Voltage FAULT Output Response Time Fan RPM-to-Digital Output Fan RPM ERROR Note 1: Not production tested, ensured by design, tested during characterization. 2: For 5.0 V > V 5.5 V, the limit for V DD 2002 Microchip Technology Inc. PIN FUNCTION TABLE Name V Analog Input IN C Analog Output ...

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... Units Conditions °C °C °C — °C Units Conditions kHz Note 1 µsec Note 1 µsec Note 1 nsec Note 1 nsec Note 1 µsec Note 1 µsec Note 1 µsec Note 1 nsec Note 1 nsec Note 1 µsec Note 1 µsec Note 1 and Note 2 2002 Microchip Technology Inc. ...

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... SU(START) H(START) SU-DATA A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave FIGURE 1-1: Bus Timing Data. 2002 Microchip Technology Inc H-DATA F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave ...

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... FIGURE 2- 1.0 µ 110 125 -40 -25 FIGURE 2-6: Temperature 110 125 Temperature (°C) PWM, Sink Current vs 110 125 Temperature (ºC) Fault V vs. Temperature 110 125 Temperature (ºC) PWM Frequency vs. 2002 Microchip Technology Inc. ...

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... DD 2.585 2.580 2.575 -40 -25 - Temperature (ºC) FIGURE 2-8: V vs. Temperature. CMAX 1.205 1.200 1.195 1.190 V = 4.0 V 1.185 DD 1.180 -40 -25 - Temperature (ºC) FIGURE 2-9: V vs. Temperature. CMIN 2002 Microchip Technology Inc 0 5 110 125 -40 -25 FIGURE 2-10: Temperature 110 125 ...

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... This active high complimentary output drives the base of an external transistor or the gate of a MOSFET. 3.9 Power Supply Input (V The V pin with respect to GND provides power to the DD device. This bias supply voltage may be independent of the fan power supply. 2002 Microchip Technology Inc ...

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... Note: Refer to Table 7-1 for R FIGURE 4-1: Typical Application Circuit. 2002 Microchip Technology Inc. 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 ...

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... SMBus interface by using the IN Duty-Cycle Register. See Section 4.5 for more details on duty cycle control Period Frequency Duty Cycle Of A PWM = 1 µF). The duty cycle FAN D Qdrive G S PWM Fan Drive. pulse is high, the gate of OUT 2002 Microchip Technology Inc. ...

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... The rela- tionship between the capacitor value and the PWM fre- 2002 Microchip Technology Inc. quency is linear frequency desired, a capacitor value of 2.0 µF should be used. The fre- quency should be kept in the range Hz. ...

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... RPM measurement. control approach OUT drive stage). OUT output will go to 100% OUT output only shuts down when OUT output will continue to pulse at OUT 2002 Microchip Technology Inc. ...

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... RPM reading has been below the max- imum value of 12775 RPM for 2.4 seconds. See Table 6-1 for RPM1, RPM2 and Status Register command byte assignments. 2002 Microchip Technology Inc. 4.8 Fan Fault Threshold and Indication (FAULT) For the TC654 and TC655 devices, a fault condition exists whenever a fan’ ...

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... This address is different from industry- standard digital temperature sensors (like TCN75) and, therefore, allow the TC654/TC655 to be utilized in sys- tems in conjunction with these components. Please contact Microchip Technology Inc. addresses are required. DS21734A-page 14 if alternate 2002 Microchip Technology Inc. ...

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... SDA only changes state while SCLK is low during normal data trans- fers. (See START and STOP condi- tions) 2002 Microchip Technology Inc. TC654/TC655 5.1.1 DATA TRANSFER The TC654/TC655 support a bi-directional 2-Wire bus and data transmission protocol. The serial protocol sequencing is illustrated in Figure 1-1 ...

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... ACK DATA NACK 8 Bits Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission DATA ACK P 8 Bits Data Byte: data goes into the register set by the command byte 2002 Microchip Technology Inc. ...

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... Microchip Technology Inc. Table 6-1. Of key importance is the command byte information, which is needed in the read and write pro- tocols in order to select the individual registers. Read Write POR Default State X — 0 0000 0000 X — 0 0000 0000 X X 0000 1010 X X 0000 1010 ...

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... Register will reset the fan fault bits in the Sta- tus Register as well as the FAULT output. See Register 6-2 for the Fan Fault Threshold Register 8-bit format. D(4) D(3) D( D(1) D(0) RPM 100 . . . . 1 0 12700 1 1 12750 2002 Microchip Technology Inc. ...

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... Shutdown Mode. See Section 4.9 for more information on low power shutdown mode Normal Operation. (default) Legend Readable bit -n = Value at POR 2002 Microchip Technology Inc. V duty cycle (fan speed) control method, select the OUT fan current pulses per rotation for fans 1 & 2 (for fan RPM calculation) and put the TC654/TC655 device into a shutdown mode to save power consumption ...

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... U = Unimplemented bit, read as ‘0’ ’1’ = Bit is set ’0’ = Bit is cleared R-X R-0 R-0 VSTAT F2F F1F bit 0 is open), this bit is set to a ‘1’. IN pin is open and SMBus operation IN duty cycle will default to 39.33%. OUT x = Bit is unknown 2002 Microchip Technology Inc. ...

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... Microchip Technology Inc. 6.6 Manufacturer’s Identification Register (MFR_ID) This register allows the user to identify the manufac- output. turer of the part. The MFR_ID register is an 8-bit Read OUT only register. See Register 6-6 for the Microchip manu- facturer ID ...

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... PWM frequency 25 Hz. For this example, a PWM frequency recommended. This would define a C capacitor value of 1.5 µF. F SDA SCLK 24LC01 EEPROM TCN75 Temperature Sensor Multiple Devices on SMBus. output is set by the OUT pin. The PWM fre- F OUT 60 1000 = ----------------------- - = 40 1500 pulse must be OUT 2002 Microchip Technology Inc. ...

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... The key is to get the desired V voltage to system (or component) IN temperature relationship. The following equations apply to the circuit in Figure 7-3. 2002 Microchip Technology Inc. EQUATION analog input IN In order to solve for the values of R for V and the temperatures at which they are to occur IN need to be selected ...

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... When using MOSFETs as the fan drive element very easy to turn the MOSFETs on and off at very high rates. Because the gate capacitances of these small R VS. FAN CURRENT SENSE R (ohm) SENSE 9.1 4.7 3.0 2.4 2.0 1.8 1.5 1.3 1.2 1.0 Typical Fan Current and 2002 Microchip Technology Inc. ...

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... Note 1: A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times. 2: These drive devices are suggestions only. Fan currents listed are for individual fans. 2002 Microchip Technology Inc. the MOSFET to go into avalanche mode. Since there is very little energy in this occurrence, it will probably not fail the device, but it would be a long term reliability issue ...

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... This pulse does not represent true fan current and needs to be blanked out. This is particularly important for detecting a fan in a locked rotor condition. 2002 Microchip Technology Inc. 60 1000 ----------------------- - Fan RPM ...

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... TC654/TC655 as a true fan current pulse. Typical values for R SLOW are 1 K and 1000 pF, respectively. 2002 Microchip Technology Inc. V OUT SENSE1 TC654/ TC655 SENSE2 ...

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... Standard device marking consists of Microchip part number, year code, week code, and traceability code. DS21734A-page 28 10-Pin MSOP Device 1 10 TC654E 9 2 TC655E YWWNNN 2002 Microchip Technology Inc. ...

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... Microchip Technology Inc. User Direction of Feed P Standard Reel Component Orientation for TR Suffix Device Pitch (P) Part Per Full Reel 8 mm 10-Pin MSOP .201 (5.10) ...

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... TC654/TC655 NOTES: DS21734A-page 30 2002 Microchip Technology Inc. ...

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... Microchip Products • Conferences for products, Development Systems, technical information and more • Listing of seminars and events 2002 Microchip Technology Inc. TC654/TC655 Systems Information and Upgrade Hot Line The Systems Information and Upgrade Line provides system users a listing of the latest versions of all of Microchip's development systems software products ...

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... What deletions from the data sheet could be made without affecting the overall usefulness there any incorrect or misleading information (what and where)? 7. How would you improve this document? 8. How would you improve our software, systems, and silicon products? DS21734A-page 32 Total Pages Sent FAX: (______) _________ - _________ N Literature Number: DS21734A 2002 Microchip Technology Inc. ...

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... New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. 2002 Microchip Technology Inc. TC654/TC655 Examples: a) TC654EUN: : PWM Fan Speed Controller w/Fault Detection b) TC654EUNTR: PWM Fan Speed Controller w/Fault Detection (Tape and Reel) c) TC655EUN: PWM Fan Speed Controller ...

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... TC654/TC655 NOTES: DS21734A-page 34 2002 Microchip Technology Inc. ...

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... Serialized Quick Turn Programming (SQTP service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system ...

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... Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology (Barbados) Inc., Taiwan Branch 11F-3, No ...