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TC622/TC624
Low Cost Single Trip Point Temperature Sensor
Features
* Temperature Set Point Easily Programs with a Single External Resistor * Operates with 2.7V Power Supply (TC624) * TO-220 Package for Direct Mounting to Heatsink (TC622XAT) or Standard 8-Pin PDIP and SOIC
General Description
The TC622 and TC624 are programmable solid-state temperature sensors designed to replace mechanical switches in sensing and control applications. Both devices integrate the temperature sensor with a voltage reference and all required detector circuitry. The desired temperature set point is set by the user with a single external resistor. Ambient temperature is sensed and compared to the programmed set point. The OUT and OUT outputs are driven to their active state when the measured temperature exceeds the programmed set point. The TC622 has a power supply voltage range of 4.5V to 18.0V while the TC624 operates over a power supply range of 2.7V to 4.5V. Both devices are usable over a temperature range of -40C to +125C (TC622VXX, TC624VXX). Both devices feature low supply current making them suitable for portable applications. Eight-pin through-hole and surface mount packages are available. The TC622 is also offered in a 5-pin TO-220 package. The TC622 and TC624 are single point temperature detectors ideal for use in a wide variety of applications.
Applications
* * * * * Power Supply Over-Temperature Detection Consumer Electronics Fire/ Heat Detection UPSs, Amplifiers, Motors CPU Thermal Management in PCs
Device Selection Table
Part Number TC622COA TC622CPA TC622EAT TC622EOA TC622EPA TC622VAT TC622VOA TC622VPA TC624COA TC624CPA TC624EOA TC624EPA TC624VOA TC624VPA Voltage Operation 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 4.5V to 18V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V 2.7V to 4.5V Package 8-Pin SOIC 8-Pin PDIP 5-Pin TO-220 8-Pin SOIC 8-Pin PDIP 5-Pin TO-220 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP 8-PinSOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP Ambient Temperature 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +125C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +125C -40C to +125
2002 Microchip Technology Inc.
DS21440B-page 1
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TC622/TC624
Package Type
PDIP
NC OUT OUT GND 1 2 3 4 8 NC VDD NC TSET NC OUT OUT GND 1 2 3 4
SOIC
8 NC VDD NC TSET
SOT-220
TC622CPA TC622EPA TC622VPA
7 6 5
TC622COA TC622EOA TC622VOA
7 6 5
TC622EAT TC622VAT
NC OUT OUT GND
1 2 3 4
8
NC
NC OUT
1 2 3 4
8
NC VDD
12345
TC624CPA TC624EPA TC624VPA
OUT OUT
+9V
OUT GND
6 5
NC TSET
6
NC
5 TSET
Note: For TO-220 Package, Pin 3 is connected to case heatsink.
Functional Block Diagram
9V Battery
RSET Horn 1 5 NC TSET VDD 7 Microcontrollers NC 8
TC622 TC624
6 4 OUT NC GND OUT
3
2 ALARM
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GND TSET
VDD
7
VDD
TC624COA TC624EOA TC624VOA
7
TC622/TC624
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*
Supply Voltage (TC622) ......................................... 20V (TC624) ........................................ 5.5V Input Voltage Any Input .. (GND - 0.3V) to (VDD +0.3V) Operating Temperature ...................... -40C to +125C C Version .............................. 0C to +70C E Version ........................... -40C to +85C V Version ......................... -40C to +125C Storage Temperature ......................... -65C to +150C
.
TC622/TC624 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Over operating temperature range, unless otherwise specified. Symbol VDD IDD VOH Parameter Supply Voltage Range Supply Current Output Voltage (High) Device TC622 TC624 TC622 TC624 TC622 Min 4.5 2.7 -- -- 0.90 x VDD 0.80 x VDD VOL Output Voltage (Low) TC622 -- -- -- -- 0.90 x VDD 0.80 x VDD -- -- -- T-5 T-5 -- -- Typ -- -- 200 170 -- -- -- -- -- -- -- -- -- -- T1 T1 2 2 Max 18 4.5 600 300 -- -- 0.15 x VDD 0.30 x VDD 0.35 x VDD -- -- 0.1 x VDD 0.2 x VDD 0.25 x VDD T+5 T+5 -- -- V Unit V A V 5.0V VDD 18V 2.7V VDD 4.5V 5.0V VDD 18V, -40C TA +125C, IOH = 250A IOH = 500A -40C TA +85C, IOL = 500A IOL = 1mA -40C TA +125C, IOL = 1mA 2.7V VDD 4.5V -40C TA +125C, IOH = 250A IOH = 500A -40C TA +85C, IOL = 500A IOL = 1mA -40C TA +125C, IOL = 1mA TSET = Programmed Temperature TSET = Programmed Temperature Test Conditions
VOH
Output Voltage (High)
TC624
V V
VOL
Output Voltage (Low)
TC624
TSET OUT
Absolute Accuracy Trip Point Hysteresis
TC622 TC624 TC622 TC624
C C
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TC622/TC624
2.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (8-Pin SOIC) (8-Pin PDIP) 1 2 3 4 5 6 7 8
PIN FUNCTION TABLE
Symbol NC OUT OUT GND TSET NC VDD NC No Internal Connection. Active low output. Active high output. Ground Terminal. Temperature set point. Connect an external 1% resistor from TSET to VCC to set trip point. No Internal Connection. Power supply input. No Internal Connection. Description
Pin No. (5-Pin SOT-220) 1 2 3 4 5
Symbol OUT OUT VDD GND TSET Active low output. Active high output. Power supply input. Ground Terminal.
Description
Temperature set point. Connect an external 1% resistor from TSET to VCC to set trip point.
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TC622/TC624
3.0
3.1
DETAILED DESCRIPTION
Trip Point Programming
3.2
Hysteresis
When the temperature of the device exceeds the programmed temperature trip point, TSET, the OUT and OUT outputs are driven into their active states. The desired trip point temperature is programmed with a single external resistor connected between the TSET input and VCC. The relationship between the resistor value and the trip point temperature is given by Equation 3-1.
To prevent output "chattering" at the trip point temperature, the temperature detector in the TC622/TC624 has 2C hysteresis (see Figure 3-2). The outputs are driven active when the temperature crosses the set point determined by the external resistor. As temperature declines below the set point, the hysteresis action will hold the outputs true until the temperature drops 2C below the threshold.
FIGURE 3-2:
TC622/TC624 HYSTERESIS
Temperature
EQUATION 3-1:
RTRIP = 0.5997 x T 2.1312 Where: RTRIP = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin.
Set Point (Set Point - 2 Degrees C)
OUT
For example, as shown in Figure 3-1, to program the device to trip at 50C, the programming resistor is: RTRIP = 0.5997 x ((50 + 273.15)2.1312) = 133.65k
OUT
FIGURE 3-1:
PROGRAMMING RESISTOR VALUES VS. TEMPERATURE
250 RESISTANCE, RTRIP (k)
200
150
100
50 -55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (C)
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DS21440B-page 5
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TC622/TC624
4.0
4.1
TYPICAL APPLICATIONS
Over-Temperature Shutdown
4.2
Cooling and Heating Applications
The TC622 can be used to create a simple over-temperature shutdown circuit. In this circuit, temperature is sensed within the system enclosure (internal system ambient) or at the heatsink itself. When measured temperature exceeds a preset limit, a fault is indicated and the system shuts down. Figure 4-1 illustrates an over-temperature shutdown circuit using the TC622 sensor in a single TO-220 package, allowing direct attachment to the heatsink surface. As shown, the TC622 outputs are driven active when the heatsink temperature equals the trip point temperature set by RTRIP. When this happens, the crowbar circuit is activated, causing the supply output to fold back to zero. The TC622 outputs remain active until the heatsink temperature falls a minimum of 2C (built-in hysteresis) below the trip point temperature, at which time the device again allows normal supply operation.
The TC622/TC624 can be used to control a DC fan as shown in Figure 4-2. The fan turns on when the sensed temperature rises above T SET and remains on until the temperature falls below TSET - 2C. Figure 4-3 shows the TC622 acting as a heater thermostat. Circuit operation is identical to that of the cooling fan application.
FIGURE 4-1:
TC622 POWER SUPPLY OVER-TEMPERATURE SHUTDOWN
Heatsink
Output Device
TC622
VCC Output Device VOUT
Circuit Board TC622 Heatsink Mounting
RTRIP
Power Good Signal
TC622
TSET VDD OUT GND OUT OVERTEMP Crowbar Circuit
Heatsink Surface
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TC622/TC624
FIGURE 4-2: TC624 AS A FAN CONTROLLER FOR NOTEBOOK PC
+2.7 to 4.5V +12V
FIGURE 4-3:
TC622 AS A HEATER THERMOSTAT
+4.5 to 18.0V +12V
RSET 1 NC VDD 7 NC 8 + DC Fan
RSET 1 VDD 7 NC NC 8 Heater
5T SET
5T SET
TC622
6 NC OUT OUT 2 N-Channel Level Logic MOSFET
TC624
6 4 NC GND OUT 3 N-Channel Logic Level MOSFET
4 GND
OUT 2
Temperature
Temperature
OUT
Fan "On"
TSET
TSET
TSET - 2 C
TSET - 2 C
OUT
Heater "On"
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DS21440B-page 7
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TC622/TC624
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
5.2
Taping Form
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
5.3
Package Dimensions
8-Pin Plastic DIP
PIN 1
.260 (6.60) .240 (6.10)
.045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.070 (1.78) .040 (1.02)
.310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
3 MIN.
.110 (2.79) .090 (2.29)
.022 (0.56) .015 (0.38)
Dimensions: inches (mm)
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TC622/TC624
5.4 Package Dimensions (Continued)
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. .
5-Pin TO-220
.185 (4.70) .165 (4.19) .117 (2.97) .103 (2.62) .415 (10.54) .390 (9.91) .156 (3.96) .140 (3.56) DIA. .055 (1.40) .045 (1.14)
.293 (7.44) .204 (5.18) .613 (15.57) .569 (14.45) 3 - 7.5 5 PLCS.
.590 (14.99) .482 (12.24)
.037 (0.95) .025 (0.64) .025 (0.64) .012 (0.30) .072 (1.83) .062 (1.57) .273 (6.93) .263 (6.68) .115 (2.92) .087 (2.21)
PIN 1
Dimensions: inches (mm)
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TC622/TC624
NOTES:
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TC622/TC624
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.
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TC622/TC624
NOTES:
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TC622/TC624
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.
Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.
Printed on recycled paper.
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.
DS21440B-page 11
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WORLDWIDE SALES AND SERVICE
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03/01/02
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*B04412SD*

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