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TC650/TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert
Features
* Integrated Temperature Sensing and Multi-speed Fan Control * Built-in Over Temperature Alert (TOVER) * Temperature Proportional Fan Speed Control for Acoustic Noise Reduction and Longer Fan Life * Pulse Width Modulation Output Drive for Cost and Power Savings * Solid-State Temperature Sensing * 1C (Typical) Accuracy from 25C to +70C * 2.8V - 5.5V Operating Range * TC651 includes Auto Fan Shutdown * Low Operating Current: 50A (Typical)
Package Type
8-Pin MSOP 8-Pin SOIC
VDD 1 NC 2 SHDN 3 GND 4 8 PWM
TC650 TC651
7 GND 6 TOVER 5 NC
General Description
The TC650/TC651 are integrated temperature sensors and brushless DC fan speed controllers. The TC650/ TC651 measure their junction temperature and control the speed of the fan based on that temperature, making them especially suited for applications in modern electronic equipment. Temperature data is converted from the on-chip thermal sensing element and translated into a fractional fan speed from 40% to 100%. A temperature selection guide in the data sheet is used to choose the low and high temperature limits to control the fan. The TC650/TC651 also include a single trip point over temperature alert (TOVER) that eliminates the need for additional temperature sensors. In addition, the TC651 features an auto fan shutdown function for additional power savings. The TC650/TC651 are easy to use, require no software overhead and are therefore the ideal choice for implementing thermal management in a variety of systems.
Applications
* * * * * * Thermal Protection For Personal Computers Digital Set-Top Boxes Notebook Computers Data Communications Power Supplies Projectors
Related Literature
* Application Note: AN771
Device Selection Table
Part Number TC650XXVUA TC651XXVUA Package 8-Pin SOIC 8-PinMSOP Temperature Range -40C to +125C -40C to +125C
X A B C D E F G
Temperature 25 30 35 40 45 50 55
The "X" denotes a suffix for temperature threshold settings. Contact factory for other temperature ranges.
2002 Microchip Technology Inc.
DS21450B-page 1
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TC650/TC651
Typical Application Diagram
+12V
+5V VDD
TC650 TC651
1 VDD 2 NC PWM 8 GND 7 CSLOW
DC Fan 500mA
3 SHDN TOVER 6 4 GND NC 5 GND GND SHDN Control Over-Temp. Alert Controller
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DS21450B-page 2
2002 Microchip Technology Inc.
TC650/TC651
1.0 ELECTRICAL CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability.
Absolute Maximum Ratings*
Input Voltage (VDD to GND) ................................... +6V Output Voltage (OUT to GND) ................................. 6V Voltage On Any Pin ....... (GND - 0.3V) to (VDD + 0.3V) Package Thermal Resistance (JA ) .............. 250C/W Operating Temperature Range .......... -40C to +125C Storage Temperature ......................... -65C to +150C
TC650/TC651 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 2.8V to 5.5V, SHDN = VDD, TA = -40C to 125C unless otherwise specified. Symbol VDD IDD SHDN Input VIH VIL PWM Output VOL VOH tR tF fOUT tSTARTUP PWM Output Low Voltage PWM Output High Voltage PWM Rise Time PWM Fall Time PWM Frequency Start-up Time -- VDD - 0.5 -- -- 10 -- -- -- 10 10 15 32/fOUT 0.3 -- -- -- -- -- V V sec sec Hz sec VDD Rises from GND, or SHDN Released ISINK = 1mA ISOURCE = 5mA IOH = 5mA, 1nF from PWM to GND IOL = 1mA, 1nF from PWM to GND SHDN Input High Threshold SHDN Input Low Threshold 65 -- -- -- -- 15 %VDD %VDD Parameter Supply Voltage Supply Current Min 2.8 -- Typ. -- 50 Max 5.5 90 Units V A PWM, TOVER are open Test Conditions
Temperature Accuracy TH ACC (TH -TL) ACC THYST TOVER Output VHIGH VLOW TOVER ACC TOVER HYST TOVER Output High Voltage TOVER Output Low Voltage Absolute Accuracy Trip Point Hysteresis VDD - 0.5 -- -- -- -- -- TH + 10 5 -- 0.4 -- -- V V C C ISOURCE = 1.2mA ISINK = 2.5mA At Trip Point High Temperature Accuracy Temp. Range Accuracy Auto-shutdown Hysteresis TH - 3 -1.0 -2.5 -- TH -- -- (TH -TL)/5 TH + 3 +1.0 +2.5 -- C C C C Note 1 (TH - TL) 20C (TH - TL) 20C TC651 Only
Note 1: Transition from 90% to 100% Duty Cycle.
2002 Microchip Technology Inc.
DS21450B-page 3
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TC650/TC651
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (8-Pin MSOP) (8-Pin SOIC) 1 2 3 4 5 6 7 8
PIN FUNCTION TABLE
Symbol VDD NC SHDN GND NC TOVER GND PWM Description Power Supply Input. May be independent of fan power supply. No Internal Connect. Fan Shutdown, Active-Low Input. During Shutdown mode the chip still monitors temperature and TOVER is low if temperature rises above factory set point. Ground. Ground return for all TC650/TC651 functions. No Connect. Over-Temperature Alert, Active-Low Output. Ground. PWM Fan Drive Output. Pulse width modulated rail-to-rail logic output. Nominal Frequency is 15Hz.
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DS21450B-page 4
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TC650/TC651
3.0 DETAILED DESCRIPTION
FIGURE 3-1:
VDD Temperature Set Point and Trim Range A/D Converter Oscillator Temperature Sensor
The TC650/TC651 acquire and convert their junction temperature (TJ) information from an on-chip solid-state sensor with a typical accuracy of 1C. The temperature data is digitally stored in an internal register. The register is compared with pre-defined threshold values. The six threshold values are equally distributed over a pre-defined range of temperatures (see Table 3-1 and Table 3-2). The TC650/TC651 control the speed of a DC brushless fan using a fractional speed control scheme. The output stage requires only a 2N2222-type small-signal BJT for fans up to 300mA. For larger current fans (up to 1 Amp) a logic-level N-channel MOSFET may be used. In addition to controlling the speed of the fan, the TC650/TC651 include an on-chip over-temperature alarm (TOVER) that gives a low signal when the temperature of the chip exceeds TH by 10C, (typical). This feature eliminates the need for a separate temperature sensor for over-temperature monitoring.
FUNCTIONAL BLOCK DIAGRAM
TOVER V+ SHDN
Duty Cycle Logic Control
PWM
3.1
PWM Output
TABLE 3-1:
TEMPERATURE RANGE DEFINITION FOR TC650 (MINIMUM-SPEED MODE)
PWM Duty Cycle 40% 50% 60% 70% 80% 90% 100% 100% with Over Temp Alert (TOVER = L)
Temperature (T = TJ) T < TL TL< = T < T1 T1 < = T < T2 T2 < = T The PWM pin is designed to drive a low cost transistor or MOSFET as the low side power switching element in the system. This output has an asymmetric complementary drive and is optimized for driving NPN transistors or N-channel MOSFETs. Since the system relies on PWM rather than linear power control, the dissipation in the power switch is kept to a minimum. Generally, very small devices (TO-92 or SOT packages) will suffice. The frequency of the PWM is about 15Hz. The PWM is also the time base for the Start-up Timer (see paragraphs below). The PWM duty cycle has a range of 40% to 100% for the TC650 and 50% to 100% for the TC651.
3.2
Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns PWM high for about 2 seconds whenever the fan is started from the off state. This occurs at power-up and when coming out of Shutdown mode.
TABLE 3-2:
TEMPERATURE RANGE DEFINITION FOR TC651 (AUTO-SHUTDOWN MODE)
PWM Duty Cycle "OFF" 50% 60% 70% 80% 90% 100% 100% with Over-Temp Alert (TOVER = L)
3.3
Over-Temperature Alert (TOVER)
Temperature (T = TJ) T < TL TL< = T < T1 T1 < = T < T2 T2 < =T < T3 T3 < =T < T4 T4 < = T < TH TH < = T < TOV TOV < = T
Note:The temperature regions defined by the six temperature thresholds are pre-defined in the TC650/TC651 by means of trimming. Once a TL and TH are programmed, the T1 - T4 thresholds are automatically equally spaced between TL and TH.
This pin goes low when the TH set point is exceeded by 10oC (typical). This indicates that the fan is at maximum drive and the potential exists for system overheating; either heat dissipation in the system has gone beyond the cooling system's design limits, or some FAULT exists such as fan bearing failure or an airflow obstruction. This output may be treated as a "System Overheat" warning and used to trigger system shutdown, or bring other fans to full speed in the system. The fan will continue to run at 100% speed while TOVER is asserted. Built-in hysteresis prevents TOVER from "chattering" when measured temperature is at or near the TH + 10C trip point. As temperature falls through the TH + 10C trip point, hysteresis maintains the TOVER output low until measured temperature is 5C above the trip point setting.
2002 Microchip Technology Inc.
DS21450B-page 5
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TC650/TC651
3.4 Shutdown (SHDN)
The fan can be unconditionally shutdown by pulling low the SHDN pin. During shutdown, the PWM output is low. This is ideal for notebook computers and other portable applications when you need to change batteries and must not have the fan running at that time. Thermal monitoring and TOVER are still in operation during shutdown. IDD shutdown current is around 50A. TL and TH can be selected in 5C increments. TH must be chosen at least 10oC higher than TL. TL can range anywhere from 25C to 35C. As an example, suppose you wanted the fan to run at 40% speed at 25C or less and go to full speed at 45C. You would order the part number TC650AEVUA. As another example, suppose you wanted the fan to turn on at 30C and go to full speed at 45C. You would order the part number TC651BEVUA.
3.5
Auto-Shutdown Mode
The TC651 features auto-shutdown; when the temperature is below the factory set point at minimum speed (TL), PWM is low and the fan is automatically shut off (Auto-shutdown mode). This feature is ideal for notebook computers and other portable equipment that need to conserve as much battery power as possible and thus run a fan when it is only absolutely needed. The TC651 will continue to be active so as to monitor temperature for Tover. The TC651 exits Auto-shutdown mode when the temperature rises above the factory set point (T1).
3.6
Temperature Selection Guide (Minimum Fan Speed/Full Speed)
The five temperature regions defined by the six thresholds are defined in the TC650/TC651 by means of factory trimming. Once a TL and T H are set, the T1 - T4 thresholds are automatically equally spaced between TL and TH. Temp. Range 10C TL 25 30 35 15C 25 30 35 20C 25 30 35 30C 25 TH 35 40 45 40 45 50 45 50 55 55 Part # AC BD CE AD BE CF AE BF CG AG
Note: The Bold Type temperature settings are available for ordering. Contact factory for other temperature selections.
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DS21450B-page 6
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TC650/TC651
4.0
4.1
TYPICAL APPLICATIONS
Reducing Switching Noise
For fans consuming more than 300mA, a slowdown capacitor (CSLOW) is recommended for reducing switching PWM induced noise (see Figure 4-1). The value of this capacitor should be 4.7F to 47F, depending on the fan current consumption. See Application Note AN771 "Suppressing Acoustic Noise in PWM Fan Speed Control Systems" for more information.
FIGURE 4-1:
REDUCING SWITCHING NOISE
+12V
+5V VDD
TC650 TC651
1 VDD 2 NC PWM 8 GND 7 CSLOW
DC Fan 500mA
3 SHDN TOVER 6 4 GND NC 5 GND GND SHDN Control Over-Temp. Alert Controller
2002 Microchip Technology Inc.
DS21450B-page 7
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TC650/TC651
5.0 TYPICAL CHARACTERISTICS
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.g., outside specified power supply range) and therefore outside the warranted range
IDD vs. Temperature
90 80 Temp Accuracy (C) 70 60 IDD (A)
50
Temperature Accuracy vs. VTH
3.0 2.5
VDD = 5.6
2.0 1.5 1.0 0.5 0.0
40 30 20 10 0 -50 -25 0
25
VDD = 2.7
VDD = 5.6 VDD = 2.7 TL T1 T2 T3 T4 TH
50
75 100 125 150
TEMPERATURE (C)
TTHRESHOLD
PWM, ISINK vs. VOL, TA = 25C
500 450 400 350 VOL (mV) 300 250 200 150 100 50 0.0 0 1 2 3 4 5 6 7 8 9 10 ISINK (mA) VDD = 5.5V VDD = 2.8V
PWM, ISOURCE vs. (VDD - VOH), TA = 25C
1.0 0.9 0.8 VDD - VOH (V) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 VDD = 5.5V VDD = 2.8V
0
2
4
6
8 10 12 14 16 18 20 ISOURCE (mA)
TOVER, ISOURCE vs. (VDD - VOH), TA = 25C
1.0 0.9 0.8 VDD - VOH (V) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 7 8 9 10 VDD = 5.5V VDD = 2.8V
ISOURCE (mA)
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DS21450B-page 8
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TC650/TC651
6.0
6.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
W
P Standard Reel Component Orientation for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
User Direction of Feed
PIN 1
W
P Standard Reel Component Orientation for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
2002 Microchip Technology Inc.
DS21450B-page 9
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TC650/TC651
6.3 Package Dimensions
8-Pin MSOP
PIN 1
.122 (3.10) .114 (2.90)
.197 (5.00) .189 (4.80)
.026 (0.65) TYP.
.122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05)
6 MAX. .028 (0.70) .016 (0.40)
.008 (0.20) .005 (0.13)
Dimensions: inches (mm)
8-Pin SOIC
PIN 1
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40) Dimensions: inches (mm)
8 MAX. .
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DS21450B-page 10
2002 Microchip Technology Inc.
TC650/TC651
SALES AND SUPPORT
Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. 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.
DS21450B-page 11
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TC650/TC651
NOTES:
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DS21450B-page 12
2002 Microchip Technology Inc.
TC650/TC651
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
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Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro (R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified.
2002 Microchip Technology Inc.
DS21450B-page 13
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03/01/02
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DS21450B-page 14
2002 Microchip Technology Inc.
*B05412SD*

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