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Part: TC670
Category:
Sensors
-> Temperature Sensors
-> Fan Controllers/Fan Fault Detectors
Description: The TC670 is an Integrated Fan Speed Sensor That Predicts And/or Detects Fan Failure, Preventing Thermal Damage to Systems With Cooling Fans
Company: Microchip Technology, Inc.
Datasheet: Download TC670 datasheet File size : 127 kB
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Datasheet text preview:
M
Features
· Fan Wear-Out Detection for 2-Wire Linear-Controlled Fans · Replacement System for 3-Wire Fans · Fan Alert Signal when Fan Speed is below Programmed Threshold · CLEAR Capability for Eliminating False Alarm · Low Operating Current, 90 µA (typ.) · VDD Range 3.0V to 5.5V · Available in a 6-Pin SOT-23 Package
TC670
General Description
The TC670 is an integrated fan speed sensor that predicts and/or detects fan failure, preventing thermal damage to systems with cooling fans. When the fan speed falls below a user-specified level, the TC670 asserts an ALERT signal. With this design, a critical m inimum fan speed is determined by the user. The fan alert level is then set with a resistor divider on the THRESHOLD pin (Pin 1) of the TC670. When the m inimum fan speed is reached, the ALERT pin (Pin 5) changes from a digital high to low. This failure detection works with all linear-controlled 2-wire fans. The TC670 eliminates the need for 3-wire fan solutions. A CLEAR option can be used to reset the ALERT signal, allowing the flexibility of connecting the ALERT output of the TC670 with other ALERT/FAULT interrupts in the system. This feature can be implemented so that false fan fault conditions do not initiate system shutdown. The TC670 is specified to operate over the full industrial temperature range of -40°C to +85°C. The TC670 is offered in a 6-pin SOT-23 pin package and consumes 90 µA (typ.) during operation. The spacesaving package and low power consumption make this device an ideal choice for systems requiring fan speed m onitoring. 6 SENSE ALERT VDD
4V DD 0.1 µF 3 From R3 Micr ocontroller 1 R2 CLEAR ALERT 5 DC DC FA N FAN
Tiny Predictive Fan Failure Detector
Applications
· · · · · · · Protection for Linear-Controlled Fans Power Supplies Industrial Equipment PCs and Notebooks Data Storage Data Communications Equipment Instrum entation
Package Type
SOT-23A-6 THRESHOLD GND CLEAR 1 TC670 2 3
Typical Application Circuit
+5V
5 4
ALERT LED R4
+12V
C THRE SHOLD 6 SEN SE SENSE GND 2
RS E NS E
2003 Microchip Technology Inc.
DS21688C-page 1
TC670
1 .0 ELECTRICAL CHARACTERISTICS
TABLE 1-1:
Symbol T H R E S H OL D GND CLEAR VDD ALERT SENSE
PIN FUNCTION TABLE
Description Analog Input Ground Terminal Digital Input Bias Supply Input Digital (Open-Drain) Output Analog Input
Absolute Maximum Ratings
VD D.. 6.0V All Inputs and Outputs. ... (GND - 0.3V) to (VDD + 0.3V) Output Short-Circuit Current .........continuous Current at Input Pin ......... +/- 2 mA Current at Output Pin .... +/-25 mA Junction Temperature, TJ ............ 150°C ES D protection on all pins ........ 4 kV Operating Temperature Range......-40°C to +85°C Storage Temperature Range.......-55°C to +150°C 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 operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits are specified at +25°C, VDD = 3.0V to 5.5V, CLEAR = Low. Boldface type specifications apply for temperature range of -40°C to +85°C. Parameters
Power Supply Supply Voltage Supply Current CLEAR Input Logic Input High Level Logic Input Low Level SENSE Input Input Level Threshold Voltage Input Resistance THRESHOLD Input Input Voltage Minimum Input Voltage Maximum Input Resistance Programmed Fan Speed Alert Accuracy (Note 1) ALERT Output Output Low Voltage Output Delay Time Temperature Ranges Specified Temperature Range Operating Temperature Range Thermal Package Resistances Thermal Resistance, 6L-SOT-23 JA -- 230 -- °C/W TA TA -40 -40 -- -- +85 +125 °C °C VLOW tDELAY -- -- -- 176 0 .3 -- V ms ISINK = 2.5 mA ALERTACC -- -- -- -10 0.0 2.4 100 -- -- -- -- +10 V V M % VDD = 3.0V VTH(SENSE) RSENSE -- -- 124 50 -- -- mV k V IH VIL 0.8VDD -- -- -- -- 0.2VDD V V VDD IDD 3 .0 -- -- 90 5 .5 150 V µA
Sym
M in
Typ
Ma x
Units
Conditions
Note 1: The TC670 will operate properly over the entire power supply range of 3.0V to 5.5V. As VDD varies from 3.0V, accuracy will degrade based on the percentage of VDD, as shown in Section 2.0, "Typical Performance Curves".
DS 21688C-page 2
2003 Microchip Technology Inc.
TC670
2 .0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of sam ples 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.
Note: Unless otherwise indicated, all limits are specified at +25°C, VDD = 3.0V to 5.5V, CLEAR = Low.
115 110 Supply Current (µA) 105 100 95 90 85 80 75 70 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6.0 -45°C +25°C +90°C
160
ALERT VOUT LOW (mV)
140 120 100 80 60 40 20 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 VDD = 5.5V VDD = 3.0V
Supply Voltage (V)
ALERT ISINK (mA)
FIGURE 2-1: Voltage.
15000 14000 13000 12000 11000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 0.00 0.25
Supply Current vs. Supply
FIGURE 2-4: ISINK.
ALERT VLOW vs. ALERT
VDD = 3.0V
VDD = 2.7V
VDD = 3.3V
13000 12000 TA = -40°C 11000 TA = +25°C 10000 9000 8000 TA = +90°C 7000 6000 5000 VDD = 3.0V 4000 3000 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 6.0 8.0 10.0 ALERTACC (%)
Fan Speed (RPM)
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
THRESHOLD Voltage (V)
FIGURE 2-2: Voltage.
15000 14000 13000 12000 11000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 0.00 0.25 0.50
Fan Speed vs. Threshold
FAN SPEED (RPM)
FIGURE 2-5:
Fan Speed vs. ALERTACC.
VDD = 3.6V
177 ALERT Output Delay Time (ms) 176 175 174 173 172 171 170 169 168 2.5 3 .0 3.5 4 .0 4.5 5 .0
Fan Speed (RPM)
VDD = 5.5V
VDD = 5.0V
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
THRESHOLD Voltage (V)
FIGURE 2-3: Voltage.
Fan Speed vs. Threshold
Power Supply Voltage (VDD)
FIGURE 2-6: ALERT Output Delay vs. Power Supply Voltage.
2003 Microchip Technology Inc.
DS21688C-page 3
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