Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsLinear ICsLinear-IC Case type PDIP-8

 2001-2012 Microchip Technology Inc. DS21439D-page 1

TC620/TC621

Features:

• User Programmable Hysteresis and

Temperature Set Point

• Easily Programs with 2 External Resistors

• Wide Temperature Detection Range:

-0°C to 70°C: (TC620/TC621CCX)

-40°C to +125°C: (TC620/TC621CVX)

-40°C to +85°C: (TC620/TC621CEX)

-55°C to +125°C: (TC620/TC621CMX)

• Onboard Temperature Sensing Applications

(TC620X)

• External NTC Thermistor for Remote Sensing

Applications (TC621X)

• Available in 8-Pin PDIP and SOIC Packages

Applications:

• Power Supply Over Temperature Detection

• Consumer Equipment

• Temperature Regulators

• CPU Thermal Protection

Device Selection Table

Note: *The part code will be C or H (see

Functional Block Diagrams).

Package Type

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 pro-

grammed 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 tem-

perature 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 0°C to 70°C, -40°C to +125°C

and -55°C to 125°C.

Part Number Package

Temperature

Range

TC620X*COA 8-Pin SOIC 0°C to +70°C

TC620X*CPA 8-Pin PDIP 0°C to +70°C

TC620X*EOA 8-Pin SOIC -40°C to +85°C

TC620X*EPA 8-Pin PDIP -40°C to +85°C

TC620C*VOA 8-Pin SOIC -40°C to +125°C

TC621X*COA 8-Pin SOIC 0°C to +70°C

TC621X*CPA 8-Pin PDIP 0°C to +70°C

TC621X*EOA 8-Pin SOIC -40°C to +85°C

TC621X*EPA 8-Pin PDIP -40°C to +85°C

THERMISTOR

8-SOIC

GND

LOW LIMIT

CONTROL

LOW SET

HIGH SET

HIGH LIMIT

GND

LOW LIMIT

CONTROL

LOW SET

HIGH SET

HIGH LIMIT

TC621XCOA

TC621XEOA

TC620XCOA

TC620XEOA

TC620CVOA

THERMISTOR

8-PDIP

GND

LOW LIMIT

CONTROL

LOW SET

HIGH SET

HIGH LIMIT

TC621XCPA

TC621XEPA

8-PDIP

GND

LOW LIMIT

CONTROL

HIGH SET

LOW SET

HIGH LIMIT

TC620XCPA

TC620XEPA

5V, Dual Trip Point Temperature Sensors

Summary of content (16 pages)

PAGE 1
TC620/TC621 5V, Dual Trip Point Temperature Sensors Features: Package Type • User Programmable Hysteresis and Temperature Set Point • Easily Programs with 2 External Resistors • Wide Temperature Detection Range: -0°C to 70°C: (TC620/TC621CCX) 8-PDIP NC 1 LOW SET 2 HIGH SET 3 TC620XCPA TC620XEPA 6 LOW LIMIT 5 CONTROL GND 4 -40°C to +125°C: (TC620/TC621CVX) VDD 7 HIGH LIMIT 8 8-PDIP -40°C to +85°C: (TC620/TC621CEX) -55°C to +125°C: (TC620/TC621CMX) • Onboard Temperature Sensing Applications (TC620X
PAGE 2
TC620/TC621 Functional Block Diagrams VDD 8 Temp. to Voltage Converter 4 TC620 + 2 LOW SET VREF GEN 7 LOW LIMIT – VREF + HIGH SET 3 VREF GEN 6 HIGH LIMIT – R S Q Q 5 CONTROL* VDD 8 1 THERMISTOR Thermistor Interface Circuit 4 TC621 + HIGH SET 2 VREF GEN 7 HIGH LIMIT – VREF + LOW SET 3 VREF GEN 6 LOW LIMIT – R S Q Q 5 CONTROL* *Suffix code "C" denotes cooling option (High true CONTROL output). Suffix code "H" denotes heating option (Low true CONTROL output).
PAGE 3
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 ..................................
PAGE 4
TC620/TC621 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin PDIP) (8-Pin SOIC) 0°C to +70°C -40°C to +85°C -40°C to +125°C Symbol 1 NC 2 LOW SET Low temperature set point. Connect an external 1% resistor from LOW SET to VDD to set trip point. 3 HIGH SET High temperature set point. Connect an external 1% resistor from HIGH SET to VDD to set trip point. 4 GND Description No Internal Connection. Ground Terminal.
PAGE 5
TC620/TC621 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 (±3°C max).
PAGE 6
TC620/TC621 Using the TC621 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]).
PAGE 7
TC620/TC621 4.0 TYPICAL APPLICATIONS 4.1 Dual Speed Temperature Control 4.2 Temperature Controlled Fan 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.
PAGE 8
TC620/TC621 4.5V to 18V High Temp. Low Temp. 1 2 3 4 TC620 8 7 6 5 1 2 3 4 5 6 7 TC4469 14 13 12 11 10 9 8 1k 1k High Temp. Warning Low Temp. Warning Heating/Cooling Equipment FIGURE 4-3: DS21439D-page 8 Heating and Cooling Application  2001-2012 Microchip Technology Inc.
PAGE 9
TC620/TC621 5.0 PACKAGING INFORMATION 5.1 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 713 Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package 8-Pin SOIC (N)  2001-2012 Microchip Technology Inc.
PAGE 10
TC620/TC621 5.3 Package Dimensions Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 8-Pin Plastic DIP Pin 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .015 (0.38) .008 (0.20) 3° Min. .400 (10.16) .310 (7.87) .022 (0.56) .015 (0.
PAGE 11
TC620/TC621 6.0 REVISION HISTORY Revision D (December 2012) Added a note to each package outline drawing.  2001-2012 Microchip Technology Inc.
PAGE 12
TC620/TC621 NOTES: DS21439D-page 12  2001-2012 Microchip Technology Inc.
PAGE 13
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. Your local Microchip sales office The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
PAGE 14
TC620/TC621 NOTES: DS21439D-page 14  2001-2012 Microchip Technology Inc.
PAGE 15
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 16
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