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TC620/TC621
5V, Dual Trip Point Temperature Sensors
Features
* User Programmable Hysteresis and Temperature Set Point * Easily Programs with 2 External Resistors * Wide Temperature Detection Range: -0C to 70C: (TC620/TC621CCX) -40C to +125C: (TC620/TC621CVX) -40C to +85C: (TC620/TC621CEX) -55C to +125C: (TC620/TC621CMX) * Onboard Temperature Sensing Applications (TC620X) * External NTC Thermistor for Remote Sensing Applications (TC621X) * Available in 8-Pin PDIP and SOIC Packages
Package Type
8-PDIP
NC 1 LOW SET 2 HIGH SET 3 GND 4 8 VDD 7 HIGH LIMIT
TC620XCPA TC620XEPA
6 LOW LIMIT 5 CONTROL
8-PDIP
THERMISTOR 1 HIGH SET 2 LOW SET 3 GND 4 8 VDD 7 HIGH LIMIT
TC621XCPA TC621XEPA
6 LOW LIMIT 5 CONTROL
8-SOIC
NC 1 LOW SET 2 8 VDD LOW LIMIT HIGH LIMIT CONTROL
Applications
* * * * Power Supply Over Temperature Detection Consumer Equipment Temperature Regulators CPU Thermal Protection
HIGH SET 3 GND 4
TC620XCOA TC620XEOA TC620CVOA 8-SOIC
7 6 5
THERMISTOR 1
8
Device Selection Table
Part Number TC620X*COA TC620X*CPA TC620X*EOA TC620X*EPA TC620C*VOA TC621X*COA TC621X*CPA TC621X*EOA TC621X*EPA Package 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin SOIC 8-Pin PDIP 8-Pin SOIC 8-Pin PDIP Temperature Range 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +125C 0C to +70C 0C to +70C -40C to +85C -40C to +85C
HIGH SET 2 LOW SET 3 GND 4
TC621XCOA TC621XEOA
VDD 7 HIGH LIMIT
6 LOW LIMIT 5 CONTROL
General Description
The TC620 and TC621 are programmable logic output temperature detectors designed for use in thermal management applications. The TC620 features an onboard temperature sensor, while the TC621 connects to an external NTC thermistor for remote sensing applications. Both devices feature dual thermal interrupt outputs (HIGH LIMIT and LOW LIMIT), each of which is programmed with a single external resistor. On the TC620, these outputs are driven active (high) when measured temperature equals the user programmed limits. The CONTROL (hysteresis) output is driven high when temperature equals the high limit setting and returns low when temperature falls below the low limit setting. This output can be used to provide ON/OFF control to a cooling fan or heater. The TC621 provides the same output functions except that the logical states are inverted. The TC620/TC621 are usable over operating temperature ranges of 0C to 70C, -40C to +125C and -55C to 125C.
NOTE: *The part code will be C or H. (See Functional Block Diagrams).
2002 Microchip Technology Inc.
DS21439B-page 1
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TC620/TC621
Functional Block Diagrams
VDD 8 Temp. to Voltage Converter
TC620
+
4
7 LOW LIMIT
2 LOW SET
VREF GEN
-
VREF
+
HIGH SET 3 VREF GEN
6 HIGH LIMIT
-
R Q S Q 5 CONTROL*
VDD 8 1 THERMISTOR Thermistor Interface Circuit
TC621
+
4
7 HIGH LIMIT
HIGH SET
2
VREF GEN
-
VREF
+
LOW SET 3 VREF GEN
6
LOW LIMIT
-
R Q S Q 5 CONTROL*
*Suffix code "C" denotes cooling option (High true CONTROL output). Suffix code "H" denotes heating option (Low true CONTROL output).
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DS21439B-page 2
2002 Microchip Technology Inc.
TC620/TC621
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 ....................................................... 20V Input Voltage Any Input .. (GND - 0.3V) to (VDD +0.3V) Package Power Dissipation (TA 70C) PDIP .............................................. 730mW SOIC .............................................. 470mW Derating Factors: Plastic ........................................... 8mW/C Operating Temperature: M Version......................... -55C to +125C V Version ......................... -40C to +125C E Version ........................... -40C to +85C C Version .............................. 0C to +70C Storage Temperature ......................... -65C to +150C
TC620/TC621 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = 25C, unless otherwise specified. Symbol VDD IDD ROUT IOUT IOUT TERR Parameter Supply Voltage Range Supply Current Output Resistance Output Current Output Current Absolute Accuracy Min 4.5 -- -- -- -- T-3 Typ -- 270 400 -- -- T Max 18 400 1000 1 1 T+3 Unit V A W mA mA C 5V VDD 18V Output High or Low, 5V VDD 18V Temp Sensed Cool/Heat Source/Sink Source/Sink Test Conditions
T = Programmed Temperature
2002 Microchip Technology Inc.
DS21439B-page 3
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TC620/TC621
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (8-Pin PDIP) (8-Pin SOIC) 0C to +70C -40C to +85C -40C to +125C 1 2 3 4 5 6 7 8
PIN FUNCTION TABLE
Symbol
Description
NC LOW SET HIGH SET GND CONTROL HIGH LIMIT LOW LIMIT VDD
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.
Pin No. (8-Pin PDIP) (8-Pin SOIC) 0C to +70C -40C to +85C 1 2 3 4 5 6 7 8
Symbol
Description
THERMISTOR HIGH SET LOW SET GND CONTROL LOW LIMIT HIGH LIMIT VDD
Thermistor input. High temperature set point. Connect an external 1% resistor from HIGH SET to VDD to set trip point. Low temperature set point. Connect an external 1% resistor from LOW SET to VDD to set trip point. Ground Terminal. Control output. Low temperature push/pull output. High temperature push/pull output. Power supply input.
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DS21439B-page 4
2002 Microchip Technology Inc.
TC620/TC621
3.0 DETAILED DESCRIPTION
The TC620 has a positive temperature coefficient temperature sensor and a dual threshold detector. Temperature set point programming is accomplished with external resistors from the HIGH SET and LOW SET inputs to VDD. The HIGH LIMIT and LOW LIMIT outputs remain low as long as measured temperature is below set point values. As measured temperature increases, the LOW LIMIT output is driven high when temperature equals the LOW SET set point (3C max). If temperature continues to climb, the HIGH LIMIT output is driven high when temperature equals the HIGH SET set point (Figure 3-1). The CONTROL (hysteresis) output is latched in its active state at the temperature specified by the HIGH SET resistor. CONTROL is maintained active until temperature falls to the value specified by the LOW SET resistor. Care must also be taken to ensure the LOW SET temperature setting is at least 5C lower than the HIGH SET temperature setting. Figure 3-2 can help the user obtain an estimate of the external resistor values required for the desired LOW SET and HIGH SET trip points.
FIGURE 3-2:
TC620 SENSE RESISTORS VS. TRIP TEMPERATURE
250 RESISTANCE, RTRIP (k)
200
150
100
FIGURE 3-1:
High Set Point
TC620/TC621 INPUT VS. OUTPUT LOGIC
Temperature
50 -55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (C)
Low Set Point Low Limit Output High Limit Output Control Output (Cool Option Control Output (Heat Option)
3.2
Built-in Hysteresis
To prevent output "chattering" when measured temperature is at (or near) the programmed trip point values, the LOW SET and HIGH SET inputs each have built-in hysteresis of -2C below the programmed settings (Figure 3-3).
3.1
Programming the TC620
FIGURE 3-3:
The resistor values to achieve the desired trip point temperatures on HIGH SET and LOW SET are calculated using Equation 3-1:
BUILT-IN HYSTERESIS ON LOW LIMIT AND HIGH LIMIT OUTPUTS
EQUATION 3-1:
RTRIP = 0.5997 x T 2.1312 Where: RTRIP = Programming resistor in Ohms T = The desired trip point temperature in degrees Kelvin. For example, a 50C setting on either the HIGH SET or LOW SET input is calculated using Equation 3-2 as follows:
Set Point (Set Point 2C)
High Limit or Low Limit Output
As shown, the outputs remain in their active state (hysteresis) until temperature falls an additional 2C below the user's setting.
EQUATION 3-2:
RSET = 0.5997 x ((50 + 273.15)2.1312) = 133.6k Care must be taken to ensure the LOW SET programming resistor is a smaller value than the HIGH SET programming resistor. Failure to do this will result in erroneous operation of the CONTROL output.
2002 Microchip Technology Inc.
DS21439B-page 5
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TC620/TC621
3.3 Using the TC621
FIGURE 3-4:
350
THERMISTOR RESISTANCE (k)
The TC621 operation is similar to that of the TC620, but requires an external NTC thermistor. Use the resistance versus temperature curve of the thermistor to determine the values of the programming resistors. Note that the pin numbers for the HIGH SET and LOW SET programming resistors for the TC621 are reversed versus that of the TC620 (i.e., the resistor value on HIGH SET [Pin 2] should always be lower than the one connected to LOW SET [Pin 3]). Also note that the outputs of the TC621 are LOW TRUE when used with an NTC thermistor.
TYPICAL NTC THERMISTOR
300 250 200
150 100
50 0 0 10 20 30 40 50 60 70 TEMPERATURE (C)
3.4
TC621 Thermistor Selection
The TC621 uses an external thermistor to monitor the controlling temperature. A thermistor with a resistance value of approximately 100k at 25C is recommended. A temperature set point is selected by picking a resistor whose value is equal to the resistance of the thermistor at the desired temperature. For example, using the data shown in Figure 3-4, a 30k resistor between HIGH TEMP (Pin 2) and VDD (Pin 8) sets the high temperature trip point at +51C and a 49k resistor on LOW TEMP (Pin 3) sets the low temperature trip point to +41C.
3.5
TC620/TC621 Outputs
Both devices have complimentary output stages. They are rated at a source or sink current of 1mA maximum.
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DS21439B-page 6
2002 Microchip Technology Inc.
TC620/TC621
4.0
4.1
TYPICAL APPLICATIONS
Dual Speed Temperature Control
4.2
Temperature Controlled Fan
In Figure 4-1, the Dual Speed Temperature Control uses a TC620 and a TC4469 quad driver. Two of the drivers of the TC4469 are configured in a simple oscillator. When the temperature is below the LOW TEMP set point, the output of the driver is OFF. When the temperature exceeds the LOW TEMP set point, the TC4469 gates the oscillator signal to the outputs of the driver. This square wave signal modulates the remaining outputs and drives the motor at a low speed. If this speed cannot keep the temperature below the HIGH TEMP set point, then the driver turns on continuously which increases the fan speed to high. The TC620 will monitor the temperature and only allow the fan to operate when needed and at the required speed to maintain the desired temperature. A higher power option can be designed by adding a resistor and a power MOSFET.
In the application in Figure 4-2, a high and a low temperature is selected by two RL and RH. The TC620 monitors the ambient temperature and turns the FET switch on when the temperature exceeds the HIGH TEMP set point. The fan remains on until the temperature decreases to the LOW TEMP set point. This provides the hysteresis. In this application, the fan turns on only when required. The TC621 uses an external thermistor to monitor the ambient temperature. This adds one part, but allows more flexibility with the location of the temperature sensor.
FIGURE 4-1:
DUAL SPEED TEMPERATURE CONTROL
+12V 0.1F 10F 14 2 1 3 5 8 13 4 6 9 10 11 12 100k 50 50pF Higher Power Option MOSFET VMOTOR 1M
Low Temp 30C 2 3 High Temp. 1 5 50C
8 High 6 1N4148 Limit
Fan Motor
TC620
Low 7 Limit 4 1F 1N4148
TC4469
Temperature Scale 0C - 30 C (Fan Off) 30C - 50 C (Fan Low) 50C - UP (Fan High)
10k
7
Fan Motor
FIGURE 4-2:
TEMPERATURE CONTROLLED FAN
+12V Thermistor (NTC) +12V
Low Temp. 1 RL 2 3 RH 4 High Temp.
8
Fan Motor
TC620
7 6 5 MTP3055E
High Temp. RH Low Temp. RL
1 2 3 4
8
Fan Motor
TC621
7 6 5 MTP3055E
2002 Microchip Technology Inc.
DS21439B-page 7
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TC620/TC621
FIGURE 4-3: HEATING AND COOLING APPLICATION
4.5V to 18V
High Temp.
Low Temp. 1 2 3 4 8 7 6 5 1 2 3 4 5 6 7 14 13 12 11 10 9 8 1k 1k
TC620
TC4469
High Temp. Warning
Low Temp. Warning
Heating/Cooling Equipment
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DS21439B-page 8
2002 Microchip Technology Inc.
TC620/TC621
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)
2002 Microchip Technology Inc.
DS21439B-page 9
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TC620/TC621
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. .
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DS21439B-page 10
2002 Microchip Technology Inc.
TC620/TC621
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.
DS21439B-page 11
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TC620/TC621
NOTES:
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DS21439B-page 12
2002 Microchip Technology Inc.
TC620/TC621
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.
DS21439B-page 13
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WORLDWIDE SALES AND SERVICE
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03/01/02
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DS21439B-page 14
2002 Microchip Technology Inc.
*B93412SD*

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