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TC623
3V, Dual Trip Point Temperature Sensor
Features
* Integrated Temp Sensor and Detector Operate from a Supply Voltage as Low as 2.7V * Replaces Mechanical Thermostats and Switches * On-Chip Temperature Sense * 8-Pin DIP or SOIC for Direct PCB Mounting * 2 User Programmable Temperature Set Points * 2 Independent Temperature Limit Outputs * Heat/Cool Regulate Output
Package Type
SOIC
NC LOW SET HIGH SET GND 1 2 3 4 8 VCC LOW LIMIT HIGH LIMIT CONTROL 7 6 5
TC623CCOA TC623CEOA TC623CVOA
PDIP
NC 1 2 3 4 8 VCC LOW LIMIT HIGH LIMIT CONTROL
Applications
* * * * * * CPU Thermal Management System Over or Under Temperature Shutdown Advanced Thermal Warning Fan Speed Control Circuits Accurate Appliance Temperature Sensing Environmental Control
LOW SET HIGH SET GND
TC623CCPA TC623CEPA
7 6 5
General Description
The TC623 is a 3V solid-state, programmable temperature sensor designed for use in thermal management applications. It features dual thermal interrupt outputs (LOW LIMIT and HIGH LIMIT) each of which are set with an external resistor. The HIGH LIMIT and LOW LIMIT outputs are driven active (high) when measured temperature equals the user programmed limits. The CONTROL output is driven active (high) when temperature equals the HIGH LIMIT set point and turned off when temperature falls below the LOW LIMIT set point. The CONTROL output can be used to provide simple ON/OFF control to a cooling fan if so desired. Low voltage operation, easy set point programming, small size and low cost make the TC623 an ideal choice for many thermal management applications.
Device Selection Table
Part Number TC623CCOA TC623CCPA TC623CEOA TC623CEPA TC623CVOA Package 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC Temp. Range 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +125C
NOTE: Latch Output (C option), is a Standard Device. Contact Factory for Latch Q Output (H option).
Functional Block Diagram
NC 1 8 Temperature To Voltage Converter
TC623
VCC
+ LOW SET 2 VREF Gen. -
7 LOW LIMIT
VREF
+ 3
6 HIGH LIMIT
HIGH SET
VREF Gen.
-
GND
4
R SQ Latch
5 CONTROL
RLOW < R HIGH
2002 Microchip Technology Inc.
DS21441B-page 1
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TC623
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 ......................................................5.5V Input Voltage Any Input .. (GND - 0.3V) to (VDD +0.3V) Package Power Dissipation (TA 70C) Plastic DIP .............................................730mW SOIC......................................................470mW Derating Factors Plastic DIP ............................................8mW/C SOIC .....................................................6mW/C Operating Temperature V Version ................................. -40C to +125C E Version ................................... -40C to +85C C Version ...................................... 0C to +70C Storage Temperature.......................... -65C to +150C
TC623 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Over Operating Temperature Range, VDD = 2.7V to 4.5V, unless otherwise specified. Symbol VDD IDD TSET VOH VOL HYS Parameter Supply Voltage Range Supply Current Absolute Accuracy Output Voltage High Output Voltage Low Hysteresis Min 2.7 -- T- 3 0.9 x VDD 0.8 x VDD -- -- -- Typ. -- 150 T 1 -- -- -- -- -- Max 4.5 250 T+3 -- -- 0.1 x VDD 0.2 x VDD -2 Unit V A C V V V V C 2.7V VDD 4.5V T = Programmed Temperature IOH = 250A IOH = 500A IOL = 500 A IOL = 1mA Falling Temperature Test Conditions
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DS21441B-page 2
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TC623
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 LOW SET HIGH SET GND CONTROL HIGH LIMIT LOW LIMIT VCC No Internal Connection. Low temperature set point. Connect an external 1% resistor from LOW SET to VDD to set trip point. High temperature set point. Connect an external 1% resistor from HIGH SET to VDD to set trip point. Ground Terminal. Control output. High temperature push/pull output. Low temperature push/pull output. Power supply input. Description
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DS21441B-page 3
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TC623
3.0
3.1
DETAILED DESCRIPTION
TC623 Operation
The TC623 has a positive temperature coefficient (Silicon) temperature sensor and dual threshold detector. Temperature set point programming is accomplished with external resistors from the HIGH SET and LOW SET inputs to VCC. The HIGH LIMIT and LOW LIMIT outputs remain inactive (low) as long as the measured temperature is below set point values. As temperature increases, the LOW LIMIT is driven high when temperature equals the LOW LIMIT set point (3C). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH LIMIT set point (3C). Figure 3-1 shows the relationship between the sense resistance values and trip point temperature.
The CONTROL output is driven high when the HIGH LIMIT output goes high and is RESET low when the LOW LIMIT output goes low. This output provides the logic for simple ON/OFF fan control. Figure 3-2 shows overall TC623 operation.
FIGURE 3-2:
High Set Point
TC623 TEMPERATURE VS. OUTPUT
Temperature
Low Set Point Low Limit Output High Limit Output Control Output (Cool Option)
FIGURE 3-1:
TC623 SENSE RESISTORS VS. TRIP TEMPERATURE
250 RESISTANCE, RTRIP (k)
200
150
100
To prevent output "chattering" when measured temperature is at (or near) the trip point values, the LOW SET and HIGH SET inputs each have a built-in hysteresis of -2C max. As a result, the HIGH LIMIT and LOW LIMIT outputs remain active until the measured temperature falls a maximum of 2C below the programmed HIGH SET and LOW SET thresholds as shown in Figure 3-3. The programmed setting threshold of Figure 3-3 is user programmed temperature trip points of either the LOW SET or HIGH SET inputs. The LOW LIMIT or HIGH LIMIT output is driven active when temperature equals the set point value (to within 3C). The output remains active until the temperature falls an additional 2C below the set point due to hysteresis.
50 -55
-35
-15
5
25
45
65
85
105
125
FIGURE 3-3:
TEMPERATURE (C)
HIGH SET AND LOW SET THRESHOLDS
Programmed Setpoint -2C Hysteresis
High Limit or Low Limit Ouput
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TC623
4.0
4.1
TYPICAL APPLICATIONS
Mounting
If the TC623 is used to measure the temperature of another device, it is important that the top surface of the TC623 package be in intimate contact with the measured device. Good thermal conductivity and no air space is critical to accurate temperature measurement in applications of this type.
4.2
Trip Point Programming
The resistance values required for the HIGH SET and LOW SET inputs are calculated using the formula below: RTRIP = 0.5997 x T 2.1312 Where; RTRIP = Programming resistor value in Ohms T = Desired trip temperature in degrees Kelvin. For example, to program a trip point of 50C, the programming resistor is: RTRIP = 0.5997 x (50 + 273.15)2.1312) = 133.65k
2002 Microchip Technology Inc.
DS21441B-page 5
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TC623
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 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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DS21441B-page 6
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TC623
Package Dimensions (Continued)
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)
2002 Microchip Technology Inc.
DS21441B-page 7
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TC623
NOTES:
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DS21441B-page 8
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TC623
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.
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TC623
NOTES:
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TC623
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.
DS21441B-page 11
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03/01/02
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DS21441B-page 12
2002 Microchip Technology Inc.
*B14412SD*

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