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Part: TC653
Category:
Sensors
-> Temperature Sensors
-> Fan Controllers/Fan Fault Detectors
Description: The TC652/653 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers With FanSense™ Technology
Company: Microchip Technology, Inc.
Datasheet: Download TC653 datasheet File size : 127 kB
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Datasheet text preview:
TC652/TC653
Integrated Temperature Sensor & Brushless DC Fan Controller with FanSenseTM Detect & Over-Temperature
Features
· Integrated Tem perature Sensing and Multi-speed Fan Control · FanSenseTM Fan Fault Detect Circuitry · Built-in Over-Temperature Alert (TOVER) · Tem perature Proportional Fan Speed C ontrol for Acoustic Noise Reduction and Longer Fan Life · Pulse Width M odulation Output Drive for Cost and Power Savings · Solid-State Temperature Sensing · ±1°C (Typical) Accuracy from 25°C to +70°C · 2.8V 5.5V Operating Range · TC653 includes Auto Fan Shutdown · Low Operating Current: 50µA (Typical)
Package Type
MSOP
VDD 1 FAULT 2 SHDN 3 GND 4 8 PWM
TC652 TC653
7 GND 6 TOVER 5 SENSE
General Description
The TC652/TC653 are integrated temperature sensors and brushless DC fan speed controllers with FanSenseTM technology. The TC652/TC653 measure their junction tem perature and control the speed of the fan based on that temperature, making them especially suited for applications in modern electronic equipment. The FanSenseTM Fan Fault detect circuitry eliminates the need for a more expensive 3-wire fan. Temperature data is converted from the on-chip thermal sensing elem ent 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 TC652/TC653 also include a single trip point over temperature alert (TOVER) that eliminates the need for additional temperature sensors. In addition, the TC653 includes an auto fan shutdown function for additional power savings. The TC652/TC653 are easy to use, require no software overhead and are therefore the ideal choice for implementing thermal m anagement in a variety of systems.
Applications
· · · · · · Thermal Protection For Personal Computers Digital Set-Top Boxes Notebook Com puters Data Communications Power Supplies Projectors
Related Literature
· Application Note: AN771
Device Selection Table
Part Number TC652XX VUA TC653XX VUA Package 8-Pin MSOP 8-Pin MSOP Temperature R ange -40°C to +125°C -40°C to +125°C
X A B C D E F G
Temperature 25 30 35 40 45 50 55
The "X" d enotes a suffix for te mperature thresh old se tting s. Con ta ct fa ctory for othe r te mperature rang es.
2002 Microchip Technology Inc.
D S21453B-page 1
©
TC652/TC653
Typical Application Diagram
+12V DC Fan 300mA Max. 1k 1 VDD 2 FAULT 3 SHDN 4 GND PWM 8 GND 7 TOVER 6 SENSE 5 CSENSE GND SHDN Control Fan Fault Alert µController Over-Temp Alert RSENSE 2 FanSenseTM 0.01µF
+5V VDD
TC652 TC653
©
DS 21453B-page 2
2002 Microchip Technology Inc.
TC652/TC653
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. E xposur e to Absolute Maximum R ating conditions for extended periods may affect device reliability.
Absolute Maximum Ratings*
Input Voltage (VDD to GND) .. +6V Output Voltage (O UT to G ND) ......... 6V Voltage On Any Pin ....... (GND 0.3V) to (VDD + 0.3V) Package Therm al Resistance (JA ) .. 250°C /W Operating Temperature Range ......... -40°C to +125°C Storage Temperature ....... -65°C to +150°C
TC652/TC653 ELECTRICAL SPECIFICATIONS
Electrical Characterist ics: VD D = 2.8V to 5.5V, SHDN = VDD, TA = -40°C to 125°C unless otherwise specified. Symbol VDD IDD SHDN Input VIH VIL PWM Output VOL VOH tR tF fOUT tSTARTUP VTH (SEN SE) PWM Output Low Voltage PWM Output High Voltage PWM R ise Time PWM Fall Time PWM Frequency Start-up Time Sense Input -- VDD 0.5 -- -- 10 -- -- -- -- 10 10 15 32/fOU T 70 0.3 -- -- -- -- -- -- V V µsec µsec Hz sec mV VDD Rises from GND, or S HDN Released S ense Input Threshold Voltage with Repect to Ground ISINK = 1mA ISOUR CE = 5mA IOH = 5mA, 1nF from P WM to GND IOL = 1mA, 1nF from P WM to GND SHDN Input High Thr eshold SHDN Input Low Threshold 65 -- -- -- -- 15 %VDD %VDD Parameter Supply Voltage Supply Cur rent Min 2.8 -- Typ. -- 50 Max 5.5 90 Units V µA P WM, FAULT, TOVER are open Test Conditions
Temperature Accuracy TH ACC (TH TL) ACC THYST FAULT Output VHIGH VLOW tmp TOVER Output VHIGH VLOW TOVER
Note
A CC
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
N ote 1 ( TH TL) 20°C ( TH TL) 20°C TC653 Only
FA ULT Output High Voltage FA ULT Output Low Voltage Missing Pulse Detector Time-out
VDD 0.5 -- --
-- -- --
-- 0.4 32/fOUT
V V S ec
ISOUR CE = 1.2mA ISINK = 2.5mA
TOVER Output High Voltage TOVER Output Low Voltage Absolute Accuracy Trip Point Hysteresis
Tran sition fro m 90% to 100% Dut y Cycle.
VDD 0.5 -- -- --
-- -- TH + 10 5
-- 0.4 -- --
V V °C °C
ISOUR CE = 1.2mA ISINK = 2.5mA A t Trip Point
TOVER HYST
1:
2002 Microchip Technology Inc.
D S21453B-page 3
©
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