TC665 Microchip Technology Inc., TC665 Datasheet
TC665
Available stocks
Related parts for TC665
TC665 Summary of contents
Page 1
... FF (bit 0<0>) in the Status Register will also be set to a ‘1’. An over-temperature condition is indicated when the voltage at V TC665 devices indicate this by setting OTF(bit 5<X>) in the Status Register to a '1'. The TC665 device also pulls the FAULT line low during an over-temperature condition. The TC664/TC665 devices are available in a 10-Pin V ...
Page 2
... TC664/TC665 Functional Block Diagram MIN SCLK SDA GND Note: OTF condition applies for the TC665 device only. DS21737A-page 2 TC664/TC665 – Note V OTF – + OTF + Control + Logic – Start-up Timer Missing Pulse Detect Clock Generator 50 k – Serial Port 100 mV (typ.) ...
Page 3
... IL V — — 0 — -1.0 — +1.0 LEAK I 6 — — OLSDA = 2 TC664/TC665 Function < +85°C. A Units Conditions V µA Pins 8, 9 Open µA Pins 8, 9 Open µsec mA, Note 1 OH µsec mA, Note 10 ...
Page 4
... TC664/TC665 TEMPERATURE SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all parameters apply at V Parameters Temperature Ranges: Specified Temperature Range Operating Temperature Range Storage Temperature Range Thermal Package Resistances: Thermal Resistance, 10 Pin MSOP TIMING SPECIFICATIONS Electrical Characteristics: Unless otherwise noted, all limits are specified for V -40° ...
Page 5
... G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master TC664/TC665 SU(STOP) IDLE ...
Page 6
... TC664/TC665 2.0 TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e ...
Page 7
... FIGURE 2-11 Hysteresis vs. Temperature. THSENSE 150 140 130 V = 5.0 V 120 DD 110 100 110 125 -40 -25 FIGURE 2-12: Temperature. TC664/TC665 110 125 Temperature (ºC) RPM %error vs 3. 5.5V ...
Page 8
... See Section 5.0 for more informa- tion on the serial interface. 3.5 Digital (Open Drain) Output (FAULT) When the fan’s RPM falls below the user-set RPM threshold (or OTF occurs with TC665), a logic low signal is asserted. DS21737A-page 8 3.6 Analog Input (SENSE) Fan current pulses are detected at this pin. These pulses are counted and used in the calculation of the fan RPM ...
Page 9
... The TC664/TC665 devices are identical in every aspect except for how they indicate an over-tempera- ture condition. When V cal), both devices will set OTF (bit 5<X>) in the Status Register to a '1'. The TC665 will additionally pull the FAULT output low during condition µ ...
Page 10
... The TC664/TC665 devices generate a pulse train with a typical frequency can be varied from 30% to 100%. The pulse train gen- erated by the TC664/TC665 devices drives the gate of an external N-channel MOSFET or the base of an NPN transistor (Figure 4-3). See Section 7.5 for more infor- mation on output drive device selection ...
Page 11
... OUT cycle, turning the fan full on for one second (C 1.0 µF). Once the one second period is over, the TC664/TC665 devices will look to see if SMBus or V control has been selected in the Configuration Register (DUTYC bit 5<0>). Based on this register, the device will choose which input will control the V Duty cycle control based the default state ...
Page 12
... OUT to control the PWM duty cycle via the SMBus, DUTYC (bit 5<0>) of the Configuration Register (Register 6.3) must be set to a ‘1’. This tells the TC664/TC665 device that the duty cycle should be controlled by the Duty Cycle Register. Next, the Duty Cycle Register must be programmed to the desired value ...
Page 13
... When the TC664/TC665 devices are in shutdown mode, all functions except for the SMBus interface are suspended. During this mode of operation, the TC664 and TC665 devices will draw a typical supply current of only 5 µA. Normal operation will resume as soon as Bit 0 in the Configuration Register is reset to ‘0’. ...
Page 14
... RPM, can also be obtained via the device data regis- ters. The available data and control registers make the TC664/TC665 devices very flexible and easy to use. All of the available registers are detailed in Section 6.0. 4.11 SMBus Slave Address The slave address of the TC664/TC665 devices is 0011 011 ...
Page 15
... TC664/TC665. The 7-bit SMBus address for the TC664/TC665 is 0011 011. The 7-bit address transmitted in the serial bit stream must match for the TC664/TC665 to respond with an Acknowledge (indicating the TC664/TC665 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read-Write Bit. This bit is a ‘ ...
Page 16
... In this case, the slave (TC664/TC665) will leave the data line HIGH to enable the master device to generate the STOP condition. ...
Page 17
... TC664/TC665 Function RPM Output Fan Fault Threshold Configuration Status. See Section 6.4, Status Register explanation of X Fan Speed Duty Cycle Manufacturer Identification Version Identification: (XX = ‘10’ TC664 ‘11’ TC665) D(1) D(0) RPM 12750 ...
Page 18
... TC664/TC665 6.2 FAN_FAULT Threshold Register (FAN_FAULT) The FAN_FAULT Threshold Register is used to set the fan fault threshold level for the fan. The Fan Fault Threshold Register is an 8-bit read/writable register that allows the fan fault RPM threshold to be set in 50 RPM increments. The default setting for the Fan Fault Register is 500 RPM (0000 1010) ...
Page 19
... FPPR: Fan Pulses Per Rotation The TC664/TC665 device uses this setting to understand how many current pulses per revolu- tion the fan should have. It then uses this as part of the calculation for the fan RPM value for the RPM Register. See Section 7.7 for application information on determining your fan’s number of current pulses per revolution ...
Page 20
... Unimplemented: Read as ‘0’ bit 5 OTF: Over Temperature Fault Condition For the TC664/TC665 device, this bit is set to the proper state immediately at startup and is therefore treated as an unknown (X cycle on V OUT bit will be set to ‘0’. This is determined at power-up. ...
Page 21
... See Register 6-6 for the Microchip manu- facturer ID. method of duty REGISTER 6-6: D[7] D[ 6.7 Version ID Register (VER_ID) This register is used to indicate which version of the device is being used, either the TC664 or the TC665. This register is a simple 2-bit Read only register. IN REGISTER 6-7: D[1] D[0] Version TC664/TC665 MANUFACTURER’ ...
Page 22
... V system are shown in Figure 7-1. Although SMBus specifications only require the SDA and SCLK lines to pull down 350 µA, with a maximum voltage drop of 0.4 V, the TC664/TC665 devices have been designed to meet a maximum voltage drop of 0.4 V with current. This allows lower values of pull-up resistors to be used, which will allow higher bus capacitance ...
Page 23
... They are R described earlier, you can see that the thermistor has a logarithmic resistance variation. When put in parallel with R , though, the combined resistance becomes 1 more linear, which is the desired effect. This gives us the linear looking curve for V TC664/TC665 --------------------------------------- - ...
Page 24
... FIGURE 7-6: Sense Pin Waveforms. 7.5 Output Drive Device Selection The TC664/TC665 devices are designed to drive two external NPN transistors or two external N-channel MOSFETs as the fan speed modulating elements. These two arrangements are shown in Figure 7-7. For lower current fans, NPN transistors are a very econom- ical choice for the fan drive device ...
Page 25
... MOSFETs are very low, the TC664/TC665 devices can charge and discharge them very quickly leading to very fast edges. Of key concern is the turn-off edge of the MOSFET. Since the fan motor winding is essentially an inductor, when the MOSFET is turned off, the current that was flowing through the motor wants to continue to flow ...
Page 26
... IN 0.01 µF capacitor. In order to keep fan noise off of the TC664/TC665 device ground, individual ground returns for the TC664/ TC665 and the low side of the fan current sense resis- tor should be used. 7.7 Determining Current Pulses Per Revolution of Fans There are many different fan designs available in the marketplace today ...
Page 27
... This new sensing configuration is shown in Figure 7-12. The values of the resistor/capac- itor combination should be adjusted so that the voltage pulse generated by the extra current pulse is smoothed and is not registered by the TC664/TC665 as a true fan current pulse. Typical values for R SLOW are 1 k and 1000 pF, respectively ...
Page 28
... Standard device marking consists of Microchip part number, year code, week code, and traceability code. DS21737A-page 28 10-Pin MSOP Device 1 10 TC664E 9 2 TC665E YWWNNN 2002 Microchip Technology Inc. ...
Page 29
... 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) .183 (4.65) 6 MAX. MAX. .028 (0.70) .016 (0.40) TC664/TC665 W Reel Size 2500 13 in. .009 (0.23) .005 (0.13) Dimensions: inches (mm) DS21737A-page 29 ...
Page 30
... TC664/TC665 NOTES: DS21737A-page 30 2002 Microchip Technology Inc. ...
Page 31
... Conferences for products, Development Systems, technical information and more • Listing of seminars and events 2002 Microchip Technology Inc. TC664/TC665 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. ...
Page 32
... Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Y Device: TC664/TC665 Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs you find the organization of this data sheet easy to follow? If not, why? 4 ...
Page 33
... Microchip Technology Inc. TC664/TC665 Examples: a) TC664EUN: PWM Fan Speed Controller w/ Fault Detection b) TC664EUNTR: PWM Fan Speed Controller w/Fault Detection (Tape and Reel) c) TC665EUN: PWM Fan Speed Controller w/ Fault Detection d) TC665EUNTR: PWM Fan Speed Controller w/Fault Detection (Tape and Reel) DS21737A-page33 ...
Page 34
... TC664/TC665 NOTES: DS21737A-page 34 2002 Microchip Technology Inc. ...
Page 35
... Use of Microchip’s products as critical com- ponents in life support systems is not authorized except with express written approval by Microchip. No licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. 2002 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, FilterLab ...
Page 36
... Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Microchip Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 Austria Microchip Technology Austria GmbH Durisolstrasse 2 A-4600 Wels Austria Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 05/16/02 2002 Microchip Technology Inc. ...