Version 2.11, May 2005 Datasheet DS-FanControl-TDA21801 TDA21801 Authors: E. Chang 1) G. Bernacchia 2) N. Florio 2) R. Pittassi 2) G. Capodivacca 2) Published by Infineon Technologies AG http://www.infineon.com/dcdc 1) Villach, Infineon Technologies Austria AG 2) Padova, Infineon Technologies Italia S.r.l. Power Management & Drive N e v e r s t o p t h i n k i n g. FanControl Page 1 of 30 DS-FanControl-TDA21801 Contents: 1. Features ...................................................................................................................... 4 2. Applications................................................................................................................. 4 3. Pinout and Description .................................................................................................. 4 4. General Description...................................................................................................... 5 4.1 Block Diagram..................................................................................................................... 7 4.1.1 External Components Recommendation Values........................................................... 7 4.2 Application Circuit.............................................................................................................. 8 4.3 Absolute Maximum Ratings............................................................................................... 9 4.4 Thermal Characteristic ....................................................................................................... 9 4.5 Operating Condition ......................................................................................................... 10 6 Application Information ................................................................................................ 11 6.1 Filter and Amplifier parameters ....................................................................................... 11 6.2 Oscillator parameters ....................................................................................................... 12 6.2.1 Electrical Characteristic 13 6.3 Digital Control parameters............................................................................................... 15 6.3.1 Function of the speed loop 15 6.4 Power Output Stage parameters ..................................................................................... 15 6.4.1 Electrical Characteristic – Power Output Stage 16 6.5 Speed Value Generation parameters .............................................................................. 17 6.6 NTC input .......................................................................................................................... 19 6.6.1 Electrical Characteristic - NTC 19 6.7 FCin Input.......................................................................................................................... 21 6.7.1 Electrical Characteristic - FCin 22 6.8 Under Voltage Lockout Block .......................................................................................... 23 6.8.1 Electrical Characteristic – Undervoltage Lockout FanControl Page 2 of 30 24 DS-FanControl-TDA21801 6.8 FanM .................................................................................................................................. 25 6.8.1 Electrical Characteristic – FanM Signal 25 7. Outline Dimension: ..................................................................................................... 27 7.1 Footprint Drawing PG-DSO-8........................................................................................... 27 FanControl Page 3 of 30 DS-FanControl-TDA21801 TDA21801 Low Cost Fan Speed Controller 1. Features • Low cost Fan Speed Controller for standard two wires fans • No external components for fan speed loop compensation necessary • Tacho output signal, FanM for speed measurement • Adjustable minimum Fan Speed • External control voltage for fan speed setting • System Overtemperature Protection for early warning and for system shutdown. PG-DSO-8 2. Applications • Fan Speed Control for PC Desktop Silver Box Power Supply Type Package Marking Ordering Code TDA21801 PG-DSO-8 21801 Q67042-S4257 3. Pinout and Description TOP VIEW TDA21801 FCin 1 8 VDD RSin 2 3 7 6 NTC TRSOUT GND 4 5 RC-VCO FanM N° Name 1 FCin Analog input for external speed control 2 RSin Sense-resistor input signal 3 TRSOUT 4 GND 5 RC-VCO 6 FanM 7 NTC Analog input for temperature sensor (NTC divider) 8 VDD Supply voltage FanControl Description Output to drive the external PNP transistor Ground VCO adjustment for minimum (minimal) frequency and OTP-psu-shut-down. Digital output for speed monitoring. Two pulses per revolution signal. Monitor for OTP-early warning and OTP-psu-shut-down warning. Page 4 of 30 DS-FanControl-TDA21801 4. General Description The Fan Speed Controller is a fully integrated control with few external components to set up a flexible and low cost application. The device uses the waveform of the current in a standard two-wire fan to detect the speed of revolution and to control it. The current flowing through the fan is sensed by the shunt resistor connected to RSin. For fans with a supply current between 50mA and 400mA, a good value for this resistor is between 0.5 and 1Ω as the maximum input voltage of RSin for linear operation is 330mV. The Pulse Detector circuit creates one internal trigger pulse at every commutation of the fan motor. The internal trigger pulse will be processed if the current waveform through the motor shows appropriate variations at the commutation. Monitoring and warning signal can be used to check the working condition. Every two internal trigger pulses one is fed to the FanM output to monitor the speed of rotation. The device controls the speed of revolution. The temperature is measured with the NTC thermistor and according to the voltage on the NTC the speed of the fan is set. In Fig.1 the dependence of the fan speed with the temperature is shown (supposing a minimum speed of 1329 rpm). The expression of the minimum VCO frequency @ minimum FAN Speed is given by: fvco = 16 *n*P 15 n = Fan speed in rpm. P =number of pole (Fans in use for desktop PC SMPS are normally 4 poles). FanControl Page 5 of 30 DS-FanControl-TDA21801 n max = 4540 rpm n min = 1329 rpm Fig.1 Fan Speed (rpm) vs. Temperature Consider only the typical curve (blue line) FanControl Page 6 of 30 DS-FanControl-TDA21801 4.1 Block Diagram 12V VDD 8 6 BIAS Fan M Digital Integrator Logic Unit FanM 3 TRSOUT DAC RBIAS FCin 1 NTC 7 RVCO Speed Value Generator + OTP 5 RC-VCO VCO In Case of OTP RNTC RSin 2 Filter Amplifier CVCO 1mA VDD Pulse Detection 4 RRSin GND Fig. 2 TDA21801 Block Diagram 4.1.1 External Components Recommendation Values Name Description Typ. Value Tolerance RBIAS Pull up resistor for NTC divider 3.6 kΩ 1% RNTC NTC, thermally coupled e.g. with heat sink 2.2 kΩ 5% RRSin Shunt Resistor to measure fun current 0.5 Ω ~ 1 Ω 5% RVCO VCO frequency setting resistor and capacitor 220KΩ 1% CVCO FanControl 3.3nF Page 7 of 30 5% DS-FanControl-TDA21801 4.2 Application Circuit FanControl Page 8 of 30 DS-FanControl-TDA21801 4.3 Absolute Maximum Ratings At Tj = 25 °C, unless otherwise specified Values Parameter Symbol Min. Max. Unit Voltage supplied to ‘VDD’ pin; DC VDD -0.3 13.2 Max voltage on ‘TRSOUT’ pin; DC VTRSOUT -0.3 13.2 Max voltage on ‘FanM’ pin; DC VFanM -0.3 5.5 Max voltage on ‘RSin’ pin; DC VRSin -0.3 5.5 Max voltage on ‘NTC’ pin; DC VNTC -0.3 13.2 Max voltage on ‘FCin’ pin; DC VFCin -0.3 5.5 VRC-VCO -0.3 13.2 Junction temperature TJ -25 125 Storage temperature TS -55 150 Max voltage on ‘RC-VCO’ pin; DC ESD Rating; Human Body Model °C 2 kV 200 V 55/150/56 - ESD Rating; Machine Model IEC climatic category; DIN EN 60068-1 V 4.4 Thermal Characteristic Values Parameter Symbol Thermal resistance, junction-soldering point (PG-DSO-8) Thermal resistance, junction-ambient (PG-DSO-8) FanControl Page 9 of 30 Min. Typ. Rthjc-PG-DSO-8 95 Rthja-PG-DSO-8 125 Max. DS-FanControl-TDA21801 Unit K/W 4.5 Operating Condition At Tj = 25 °C, unless otherwise specified Parameter Symbol Values Min. Typ. Max. VDD 10.8 12 13.2 VTRSOUT 0 FanM VFanM 0 RSin VRSin 0 0.5 NTC VNTC 0 VDD FCin VFCin 0 3.5 VRC-VCO 0 VDD Junction temperature Tj 0 100 Ambient temperature Ta 0 70 Voltage supplied to ‘VDD’ pin; DC Voltage supplied to ‘TRSOUT’ pin; DC RC-VCO Operating supply current1 1 IVDD VDD 3.3 8 5 12 Without taking into account output current of TRSOUT, FanM and RC-VCO. FanControl Page 10 of 30 UNIT DS-FanControl-TDA21801 V °C mA 6 Application Information 6.1 Filter and Amplifier parameters The Fan current is measured by a shunt resistor RRSin and connected to the RSin pin. This is the input signal to the pre-amplifier with a typical gain of 15 and a typical cut off frequency of 20k Hz and –6 dB/ octave. Only an input signal between 40mV and 330mV will be properly detected and processed otherwise the recognition of the pulse cannot be guaranteed. The value of the shunt resistor RRSin has to be chosen according to the current of the fan. For example with spike current of 400mA a shunt resistor of typically 0.68Ω should be used. At typical operating condition. Parameter Symbol Conditions GRSin Verified by Design Cutoff frequency FFA Verified by Design RSin pin source current IRsin VRSin= 100m V Gain R3 14R VRSin R1 + _ R V- Ib I1 VREF Rf R I2 VOUT‘ 14R R2 + _ Values Min. Typ. Max. 14.7 15 15.3 20 0 D UNIT kHz 4 uA VOUT C Fig. 3 Analog front end Block Diagram FanControl Page 11 of 30 DS-FanControl-TDA21801 6.2 Oscillator The technology of oscillator is similar to the industrial standard 555-timer, with control voltage to increase frequency by a factor of up to 3.4. The external timing resistor, RVCO and capacitor, CVCO set the minimum frequency of Voltage Controlled Oscillator. The minimum Fan Speed can be adjusted in the range from 750 to 4000 rpm. With tolerance of 3% at rated speed of 1322 rpm, VDD=12V and 25°C (without external components’ tolerance), RC-VCO is switched to continuous VDD-output-voltage with open collector output stage if OTP-condition is detected at NTC input. Typical source current up to VDD-5V is 1mA. For this function the anode of a diode can be connected to RC-VCO and the cathode with the 5V input of an external Power-Good circuit. In the case of no OTP the oscillator works between VSP and VSPH and so the diode will not conduct due to lower voltage at Anode compared to Cathode (=5V-input of PowerGood circuit). R C Fig. 4 OTP Application circuit FanControl Page 12 of 30 DS-FanControl-TDA21801 6.2.1 Electrical Characteristic - Oscillator At typical operating condition. Parameter Minimum speed control voltage limit High speed control voltage limit Upper threshold Minimum VCO frequency Minimum VCO frequency Maximum VCO frequency Symbol VSPfmin Typ. Max. doesn’t change the frequency: produces the maximum 10.15 25.25 25.5 25.75 30.80 31.06 31.35 5.005 5.160 5.315 kHz 4.902 5.160 5.418 kHz 16.55 17.80 19.05 kHz frequency: f = f max (VbD) VSPH (VbD) VDD % of VDD % of VDD VDD = 12V, Tj=25°C, C = 3.3nF, f min0 R= 220kΩ Note 1 VNTC=1.5V 0.42V <FCin<0.72V VDD = 12V, 0°C <Tj<100°C, C = f min 3.3nF, R=220kΩNote 1 VNTC=1.5V 0.42V <FCin<0.72V VDD = 12V, 0°C <Tj<100°C, C = f max 3.3nF, R = 220kΩ 1) VNTC=1.5V FCin>3V VCO sink current I VCO sink I VCO source to have a minimum frequency error better than 5% At Vvco=2V 25°C <Tj<100°C At Vvco=VDD-5V. 2) 1 nF 9 mA 0.7 1 1.45 Verified by Design (VbD) (1) Parasitic PAD capacitor is typically 2pF. (2) In OTP condition a current generator (MOS current mirror is turned on). FanControl % of 10 Lowest VSP voltage, which VSPfmax Unit 9.85 f = f min (VbD) CVCO OTP condition Min. Highest VSP voltage, which External capacitor VCO source current in Values Conditions Page 13 of 30 DS-FanControl-TDA21801 mA The control loop regulates the fan rotation to a reference frequency. This reference is provided by the internal voltage controlled oscillator. The basic architecture of the VCO is the standard 555 topology. The minimum frequency setting is fixed by an external RC network. The voltage across C is forced to oscillate between the two thresholds VSPH and VSP. The period of oscillation is given by the expression: V − VSP TS = Tch arg e + Tdisch arg e = RC ln DD VDD − VSPH + 500ns Discharging the capacitor is achieved through an internal pull-down transistor. The discharge time is constant and very short compared to the RC time constant. The advantage of this topology is to be insensitive to variations on VDD if the thresholds VSP and VSPH are directly derived from the VDD itself Fig. 5 RC-VCO Valley Voltage At Minimum and Maximum Frequency FanControl Page 14 of 30 DS-FanControl-TDA21801 6.3 Digital Control parameters 6.3.1 Function of the speed loop The VCO sets the length of the FanM pulse (TFanM = 16*Tvco). The length of this pulse is fixed for fixed VCO frequency. The speed loop tries to keep the FanM duty cycle of 12.5% stable. For fixed VCO frequency this means that the fan speed is stable. If the VCO frequency is increased, the FanM pulse length TFanM is decreased, so with the previous fan speed the duty cycle is lower than 12.5%. The speed loop then increases the fan speed to achieve 12.5% duty cycle. This happens by reducing TRSOUT. If the duty cycle is too high, this means the FanM frequency and fan speed is too high, the TRSOUT output is increasing (voltage across fan is decreasing). If the duty cycle is too low, this means the FanM frequency and fan speed is too low, the TRSOUT output is decreasing (voltage across fan is increasing). At power-on and every time the fan is turned on starting from not rotating condition the applied voltage on TRSOUT is 6.8V referenced to VDD. 6.4 Power Output Stage parameters The output of the DAC is amplified to the output TRSOUT. The power output stage is connected with an external transistor to control the fan. There is an intentional internal coupling of fast VDD supply voltage variations to the output TRSOUT to keep the voltage across the fan stable. The ratio between supply variations and voltage variations across VDDTRSOUT is expressed as PSRR in the table below. FanControl Page 15 of 30 DS-FanControl-TDA21801 6.4.1 Electrical Characteristic – Power Output Stage At typical operating condition. Parameter Output saturation voltage Symbol VTRSsat Conditions VTRSmax Startup Voltage VTRSstart TRSOUT to VDD voltage Slrn_fn01 FVCO = fn = 5.160k Hz minimum VCO speed Positive slew rate Slrp Output sink current Isink Power Supply Rejection Ratio 3Negative PSRR Min. Typ. Isink = 20m A Maximum output voltage Negative slew rate for Values VDD-1 VTRSOUT = 1 V TRSOUT refered to VDD; Freq=20k Hz 6.46 6.8 Max. 0.4 V VDD V 7.28 V -1.17 V/s 3*Slrn 3*Slrn 3*Slrn 30 50 mA -20 -40 dB slew rate meaning decreasing of the VTRSout and increasing of the voltage across the fan. Value defined in order to have a stable global loop FanControl Page 16 of 30 Unit DS-FanControl-TDA21801 6.5 Speed Value Generation parameters This block generates the lower threshold for the oscillator: increasing the lower threshold the frequency of the VCO is increased as well. This threshold is given by the highest value of the NTC amplifier output, FCin amplifier output and VSPn min and it is limited to VSPn max. For VDD=12V and typical values following limits are valid: VFCin < 2.9% VDD: fan stops if the voltage at NTC is higher than 9% of VDD. If the voltage of the NTC decreases below 9% of VDD, the speed of the VCO is controlled by the voltage at the NTC pin. When the NTC increase back (in case of decreasing temperature) the VCO is controlled by the NTC up to 10% of VDD. If the ‘NTC’ input voltage is increased above 10% of VDD, the fan is turned off again. 2.9% VDD < VFCin < 7.5% VDD: fan speed is controlled only by NTC (If the pin FCin is open, the open pin voltage is VFC open = 5.4% VDD typical) 7.5% VDD < VFCin: VCO and fan speed are controlled by the highest between NTC amplified output or FCin amplified output. VFCin > 23% VDD: VCO oscillator is forced to work at max speed Fig. 6 FAN speed vs. NTC pin voltage (FCin < 2.9% of VDD) FanControl Page 17 of 30 DS-FanControl-TDA21801 n max n min0 Fig. 7 FAN speed vs. temperature (FCin < 2.9% of VDD) Fig. 8 FAN speed vs. NTC pin voltage (2.9% of VDD <Fcin < 7.5% of VDD) FanControl Page 18 of 30 DS-FanControl-TDA21801 6.6 NTC input The analog input for NTC divider gives speed information to the VCO (as indicated before) and detects two over temperature conditions for RC-VCO output and FanM output and TRSOUT output: a) OTP-early-warning condition This condition is detected, if the NTC input goes below VNTC_EW (with a certain hysteresis VHyst_EW). In this case the FanM signal will be inverted to give a warning signal to the PC-system that the power supply is becoming too hot and soon might be switched off. Normally the FanM signal has a duty cycle of 12.5% or lower. In the case of OTP-early-warning condition this duty cycle will switch to 87.5% or higher. This can be easily detected by the PC-system. b) OTP-psu-shut-down condition This condition is detected, if the NTC input goes below VNTC_OT (with a certain hysteresis VHyst_OT). In this case actions will be started to shut down the Power supply via the RC-VCO pin, also to switch FanM to High-level and TRSOUT to Low-level. OTP and Early warning output are filtered and delayed before they become active. 6.6.1 Electrical Characteristic - NTC At typical operating condition. Parameter Symbol Values Conditions Min. Typ. Max. Input voltage range VNTC 0 VDD Fan Off NTC voltage VNTC_FanOff Rising 9.8 10 10.2 Fan On NTC voltage VNTC_FanOff Falling 8.8 9 9.2 UNIT V Early warning temperature detection VNTC_EW Voltage falling 4.685 4.785 4.885 level. % of Early warning temperature detection VHyst_EW To be added to the VNTC_EW 0.19 0.25 0.29 VNTC_OT Voltage falling 4.075 4.175 4.275 VHyst_OT To be added to the VNTC_OT 0.19 0.25 0.29 without external resistor - VbD -5.2 -5 -4.8 hysteresis. Overtemperature detection level Overtemperature detection hysteresis Voltage gain FanControl GNTC Page 19 of 30 DS-FanControl-TDA21801 VDD Input resistance OTP and Early Warning delay RNTC 26.3 Td OTP-EW 40 51.4 10.4 Verified by Design (VbD) Fig. 9 Amplification of the NTC input signal FanControl Page 20 of 30 DS-FanControl-TDA21801 kΩ us 6.7 FCin Input It is an analog input for external speed control. It gives speed information to the VCO and detects fan off condition. If no external voltage source is connected, an internal resistor divider fixes the voltage level at 5.4 % of VDD. FCin signal is processed in order to make the compare the FCin signal with the NTC one. See Fig. 9 Fig. 10 NTC and FCin signal processing FanControl Page 21 of 30 DS-FanControl-TDA21801 Fig. 11 FAN speeds vs. FCin pin voltage (FCin falling and NTC >10% of VDD) 6.7.1 Electrical Characteristic - FCin At typical operating condition. Parameter OFF voltage limit Symbol Values Min. Typ. Max. Voltage Falling 2.32 2.9 3.48 To be added to the VFCoff 0.3 0.4 0.5 VFCmin 6 7.5 9 VFCmax 20.7 23 25.3 Open pin voltage VFC open 5.1 5.4 5.7 Input resistance RFC 100 160 OFF voltage limit Hysteresis Voltage limit for minimum speed Voltage limit for maximum speed FanControl VFCoff CONDITIONS VFCoff-Hyst Page 22 of 30 DS-FanControl-TDA21801 UNIT % of VDD kΩ 6.8 Under Voltage Lockout Block At the power ON/OFF, until the VDD is below 3V the FanM, RC-VCO and TRSOUT pins are all set up to high impedance state (oscillation and OTP warning not allowed). When VDD is crossing between 3 and 7V, FanM is switched to Low level, OTP is still not activated and TRSOUT pulled up to VDD. 12V V DD TRSOUT 7V 3.6V 3V RC -VCO 1.2V FanM Lockout condition - FanM - RC-VCO - TRSOUT Reset Condition Low or high impedance OTP not activate High impedance - FanM - RC - TRSOUT Low or high impedance OTP not activat High impedance Fig.12 Power Up main waveforms transitory V 12V DD 6.5V TRSOUT RC - VCO 3.6V 3V FanM 1.2V Reset Condition - FanM - RC-VCO - TRSout Lockout condition At low level OTP not activate High impedance - FanM - RC-VCO - TRSout Low or High Impedance OTP not activate High Impedance Fig.13 Power Down main waveforms transitory FanControl Page 23 of 30 DS-FanControl-TDA21801 6.8.1 Electrical Characteristic – Undervoltage Lockout At typical operating conditions Parameter Lockout Mode Voltage Limit Symbol VTLOCK CONDITIONS Values Min. Typ. Max slew rate < 5V/ms 3 Reset Mode Limit Voltage for rising VRH 7 8 -0.58 -0.7 transient Hysteresis FanControl Hyst -0.46 Page 24 of 30 Unit DS-FanControl-TDA21801 V 6.8 FanM The FanM is a digital output to show the fan speed. The output is an open drain MOSFET with internal pull up and pull down to have same behavior like a 3.3V pull up of 10K. If there is no OTP-condition detected by the analogue-speed-value block, the FanM signal with running fan will have a duty cycle of 12.5% in steady state condition and if the fan is able to run at the loop speed). If the fan is not able to run at the loop speed the duty cycle is lower than 12.5%. The FanM signal is generated to give two pulses per revolution for a four poles fan. Each of the 2 pulses has the same time length of t = 16 / frequency of VCO There are 2 exceptions: a) FanM output with OTP-early-warning condition at NTCin-pin: This condition is detected, if the NTC input goes below VNTC_EW (with a certain hysteresis VHyst_EW ). In this case the FanM-signal will be inverted to give a warning to the PC-system, that the power supply is becoming too hot and soon might be switched off. In this case the FanM duty cycle will switch to 87.5% or higher. b) FanM output with OTP-psu-shut-down condition at NTCin-pin: FanM goes to continuous HIGH-position = open Drain MOSFET off. This is a way that an external control system can detect that there is an OTP condition. This signal is a static signal, because the RCVCO pin will also be used as OTP output. This will stop the oscillator. 6.8.1 Electrical Characteristic – FanM Signal At typical operating conditions Parameter Output voltage high Symbol Conditions VFanM_H Generated from VDD=12 V Output voltage low VFanM_L Isink =6m A Output impedance RFanM FanControl Values Min. Typ. Max. 26.5 26.8 6.6 Page 25 of 30 10 27.1 Unit %of VDD 0.4 V 12.8 kΩ DS-FanControl-TDA21801 VNTC ( V ) VHYST_EW VNTC_EW VHYST_OTP VNTC_OTP Time ( sec ) CMP_EW EW CMP_OTP OTP FanM Fig. 14 Signal of the FanM vs NTC pin voltage FanControl Page 26 of 30 DS-FanControl-TDA21801 7. Outline Dimension: 7.1 Footprint Drawing PG-DSO-8 e A L B 1,27 mm 5,69 mm 1,31 mm 0,65 mm FanControl Page 27 of 30 DS-FanControl-TDA21801 Revision History Datasheet DS-FanControl-TDA21801 Actual Release: V2.11 Date: 06.05.2005 Previous Release:V2.1 Date: 30.03.2005 Page of Page of Subjects changed since last release actual Rel. prev. Rel. 13 13 Add test condition “25°C <Tj<100°C” to Ivco-source. 20 20 25 25 RNTC Tolerance changes from “min=30kΩ,max=50kΩ” to “min=26.3kΩ,max=51.4kΩ” RFANM Tolerance changes from “min=7.5kΩ,max=12.5kΩ” to “min=6.6kΩ,max=12.8kΩ” For questions on technology, delivery and prices please contact the Infineon Technologies Offices in Germany or the Infineon Technologies Companies and Representatives worldwide: see the address list on the last page or our webpage at http://www.infineon.com/DCDC We listen to Your Comments Any information within this dokument that you feel is wrong, unclear or missing at all? Your feedback will help us to continously improve the quality of this dokument. Please send your proposal (including a reference to this dokument) to: [email protected] Edition 2004-09-03 Published by Infineon Technologies AG, St.-Martin-Strasse 53, D-81541 München © Infineon Technologies AG 2004. All Rights Reserved. FanControl Page 28 of 30 DS-FanControl-TDA21801 Attention please! The information herein is given to describe certain components and shall not be considered as warranted characteristics. Terms of delivery and rights to technical change reserved. We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address list). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. FanControl Page 29 of 30 DS-FanControl-TDA21801 INFINEON TECHNOLOGIES AG Sales Offices Worldwide * Austria Infineon Technologies Austria AG Operngasse 20b/31 A-1040 Wien T (+43) 1-58 7-70 70 0 Fax (+43) 1-58 7-70 70 20 Australia Siemens Ltd. 885 Mountain Highway Bayswater,Victoria 3153 T (+61) 3-97 21 21 11 Fax (+61) 3-97 21 72 75 Belgium/Netherlands Infineon Technologies Holding B.V. 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Division Components Ronda de Europa, 5 28760 Tres Cantos-Madrid T (+34) 91 5 14 71 54 Fax (+34) 91 5 14 70 13 Sweden Infineon Technologies Nordic AB P.O. Box 46 16493 Kista, Sweden T (+46) 8 7 03 59 00 Fax (+46) 8 7 03 59 01 Infineon Technologies Switzerland AG Badenerstraße 623 P.O. Box 1570 8048 Zürich T (+41) 1 4 97 80 40 Fax (+41) 1 4 97 80 50 Taiwan Infineon Technologies Taiwan.Ltd. 12F-1, No.3-2 Yuan Qu. St., Nan Kang Software Park, Taipei Taiwan 115, ROC T (+8 86)2-2655 7500 Fax (+8 86)2-2655 7501-8 Turkey Siemens Sanayi ve Ticaret A.S. Yakacik Yolu No.111 34861 Kartal, Istanbul T (+90) 21 64 59 28 51 Fax (+90) 21 64 19 31 90 United Kindom Infineon Technologies UK.Ltd. Infineon House Fleet Mill Minley Road Fleet, Hampshire GU51 2RD T (+44) 12 52 77 22 00 Fax (+44) 12 52 77 22 01 Page 30 of 30 Infineon Technologies North America Corporation 2529 Commerce Drive Kokomo, IN 46902 T (+1) 7 65 -4 56 19 28 Fax (+1) 7 65 -4 56 38 36 Eupec Inc. 1050 Route 22 Lebanob, NJ 08833 T (+1) 90 8 -2 36 56 21 Fax (+1) 90 8 -2 36 56 20 Infineon Technologies North America Corporation 21800 Haggerty Road, Suite 112 Northville, MI 48167 T (+1) 2 48 -3 74 08 90 Fax (+1) 2 48 -3 74 25 01 Infineon Technologies North America Corporation 2901 Dallas N. Tollway, Suite 370 Plano, TX 75093 T (+1) 97 23 78 49 46 Fax (+1) 97 24 03 97 89 Spain Switzerland Infineon Technologies Italy S.r.l. Via Vipiteno 4 20128 Milano, Italy T (+39) 022 52 04 1 Fax (+39) 022 52 04 43 95 Infineon Technologies North America Corporation 485 Route 1 South Iselin, NJ 08830 T (+1) 73 28 55 92 00 Fax (+1) 73 28 55 92 Infineon Technologies North America Corporation 3000 CentreGreen Way Raleigh, NC 27513 T (+1) 91 96 77 27 00 Fax (+1) 91 96 78 19 34 Infineon Technologies North America Corporation 6170 Cornerstone Ct East, Suite 240 San Diego, CA 92121 T (+1) 85 85 26 22 01 Fax (+1) 85 85 26 22 02 Infineon Technologies Corporation 1730 North First Street San Jose, CA 95112 T (+1)4 08 -5 01 60 00 Fax (+1)4 08 -5 01 24 24 Infineon Technologies North America Corporation 1901 N. Roselle Road, Suite 1020 Schaumburg, IL 60195 T (+1) 84 78 84 70 09 Fax (+1) 84 78 84 75 99 Infineon Technologies North America Corporation 238 Littleton Road, Suite 200 Westford, MA 01886 T (+1) 97 86 92 05 50 Fax (+1) 97 86 92 23 0 * and representative offices DS-FanControl-TDA21801