Microchip Technology TC624COA, TC622VAT, TC622EPA, TC622EOA, TC622EAT Datasheet

TC622/TC624

Low Cost Single Trip Point Temperature Sensor

Features

• TemperatureSet 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

Applications

• Power Supply Over-TemperatureDetection

• Consumer Electronics

• Fire/ Heat Detection

• UPSs, Amplifiers, Motors

• CPU Thermal Management in PCs

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
driven to their active state when t he measured
temperature exceeds the programmed set point.

The TC622 has a power supply voltage range of 4.5V
to18.0VwhiletheTC624operatesovera powersupply
range of 2.7V to 4.5V. Both devices are usable over a
temperature r ange of -40°C to +125°C (TC622VXX,
TC624VXX). Both devices feature low supply current
making them suitable for portable applications.

Eight-pin throu gh-hole and surf ace mount packa ges
are available. The TC622 is also offered in a 5-pin
TO-220 package.

The TC622 and TC624 are single point t emperature
detectors ideal for use in a wide variety of applications.

outputs are

Device Selection Table

Part Number Voltage Operation Package Ambient Temperature

TC622COA 4.5V to 18V 8-Pin SOIC 0°C to +70°C

TC622CPA 4.5V to 18V 8-Pin PDIP 0°C to +70°C
TC622EAT 4.5V to 18V 5-PinTO-220 -40°C to +85°C

TC622EOA 4.5V to 18V 8-PinSOIC -40°C to +85°C

TC622EPA 4.5V to 18V 8-Pin PDIP -40°C to +85°C

TC622VAT 4.5V to 18V 5-PinTO-220 -40°C to +125°C

TC622VOA 4.5V to 1 8V 8-PinSOIC -40°C to +125°C

TC622VPA 4.5V to 18V 8-PinPDIP -40°C to +125°C

TC624COA 2.7V to 4.5V 8-Pin SOIC 0°C to +70°C

TC624CPA 2.7V to 4.5V 8-Pin PDIP 0°C to +70°C

TC624EOA 2.7V to4.5V 8-PinSOIC -40°C to +85°C

TC624EPA 2.7V to4.5V 8-PinPDIP -40°C to +85°C

TC624VOA 2.7V to 4.5V 8-PinSOIC -40°C to +125°C

TC624VPA 2.7V to4.5V 8-PinPDIP -40°C to +125°



2002 Microchip TechnologyInc. DS21440B-page 1

TC622/TC624

Package Type

PDIP

1

NC

2

OUT

OUT

GND

NC

OUT

OUT

GND

Note: For TO-220 Package, Pin 3 is connected to case heatsink.

3

4

1

2

3

4

TC622CPA
TC622EPA
TC622VPA

TC624CPA
TC624EPA
TC624VPA

8

NC

V

DD

7

NC

6

T

5

SET

8

NC

7

V

DD

NC

6

5

T

SET

Functional Block Diagram

NC

OUT

OUT

GND

NC

OUT

OUT

GND

1

2

TC622COA
TC622EOA

3

TC622VOA

4

1

TC624COA

2

TC624EOA

3

TC624VOA

4

SOT-220SOIC

NC

8

V

7

DD

NC

6

T

5

SET

NC

8

V

DD

7

NC

6

T

5

SET

+9V

TC622EAT
TC622VAT

12345

DD

OUT

OUT

GND

V

SET

T

9V

Battery

R

SET

7

1

NC

5

T

SET

V

DD

Microcontrollers

NC

8

Horn

TC622
TC624

6

NC

4

GND

OUT

OUT

3

2

ALARM

DS21440B-page 2



2002 Microchip TechnologyInc.

TC622/TC624

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage (TC622).........................................20V

(TC624)........................................5.5V

Input Voltage Any Input.. (GND – 0.3V) t o (V

DD

+0.3V)

Stresses above those listed under "Absolute Maximum Rat­ings"maycause permanentdamage to thedevice.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 R ating conditions for extended
periodsmay affectdevice reliability

.

Operating Temperature ...................... -40°C to +125°C

C Version .............................. 0°C to +70°C

E Version ...........................-40°C to +85°C

V Version ......................... -40°C to +125°C

Storage Temperature .........................-65°C to +150°C

.

TC622/TC624 EL ECTRI CAL SPECIFICATIONS

Electrical Characteristics: Over operating temperature range, unless otherwise specified.

Symbol Parameter Device Min Typ Max Unit Test Conditions

V

I

DD

SupplyVoltage Range TC622

DD

Supply Current TC622

TC624

TC624

V

V

V

V

T

SET

OutputVoltage(High) TC622 0.90 x V

OH

OutputVoltage(Low) TC622 —

OL

Output Voltage (High) TC624 —

OH

OutputVoltage(Low) TC624 —

OL

AbsoluteAccuracy TC622

TC624

OUT T rip Point Hysteresis TC622

TC624

4.5

2.7
—

—

0.80 x V

—
—

0.90 x V

0.80 x V

—
—

T-5
T-5

—
—

DD

DD

DD
DD

—
—

200
170

—

—
—

—
—

—
—

—
—
—

T±1
T±1

2
2

18

4.5

600
300

—

—

0.15 x V

0.30 x V

0.35 x V

—
—

0.1 x V

0.2 x V

0.25 x V
T+5

T+5

—
—

V

µA5.0V≤ VDD≤ 18V

2.7V ≤ V

DD

≤ 4.5V

V5.0V≤ VDD≤ 18V, -40°C ≤ TA≤ +125°C,

I

=250µA

OH

I

=500µA

OH

V-40°C≤ TA≤ +85°C, IOL=500µA

DD
DD
DD

DD
DD

DD

I

=1mA

OL

V

-40°C ≤ T

2.7V ≤ V

-40°C ≤ T
I

OH

≤ +125°C, IOL=1mA

A

≤ 4.5V

DD

≤ +125°C, IOH=250µA

A

=500µA

V-40°C≤ TA≤ +85°C, IOL=500µA

I

=1mA

OL

°C T

-40°C ≤ T

SET

T

SET

≤ +125°C, IOL=1mA

A

= Programmed Temperature
= Programmed Temperature

°C



2002 Microchip TechnologyInc. DS21440B-page 3

TC622/TC624

2.0 PIN DESCRIPTION

ThedescriptionsofthepinsarelistedinTable2-1.

TABLE 2-1: PIN FUNCTION TABLE

Pin No.

(8-Pin SOIC)

(8-Pin PDIP)

1 NC No Internal Connection.
2OUT
3 OUT Active high output.
4 GND Ground Terminal.
5T

6 NC No Internal Connection.
7V
8 NC No Internal Connection.

Symbol Description

Active low output.

SET

DD

Temperatureset point. Connect an external1% resistor from T
point.

Power supply input.

to VCCto set trip

SET

Pin No.

(5-Pin SOT-220)

1OUT
2 OUT Active high output.
3V
4 GND Ground Terminal.
5T

Symbol Description

Active low output.

DD

SET

Power supply input.

Temperatureset point. Connect an external1% resistor from T
point.

to VCCto set trip

SET

DS21440B-page 4



2002 Microchip TechnologyInc.

TC622/TC624

3.0 DETAILED DESCRIPTION

3.1 Trip Point Programming

When the temperature of the device exceeds the pro­grammed temperature trip point, T
OUT

outputs are driven into their active states. The
desired trip point temperature is programmed with a
single external resistor connected between the T
input and VCC. The relationship between the resistor
value and the trip point temperature is given by
Equation 3-1.

EQUATION 3-1:

R

= 0. 5997 x T

TRIP

Where:

R

= Programming resistor value in Ohms

TRIP

T = Desired trip temperature in degrees Kelvin.

For example, as shown in Figure 3-1, to program the
device to trip at 50°C, the programming resistor is:

R

= 0.5997 x ((50 + 273.15)

TRIP

,theOUTand

SET

2.1312

2.1312

) = 133.65kΩ

SET

3.2 Hysteresis

To prevent output “chattering”at the trip point tempera­ture, the temperaturedetectorintheTC622/TC624has
2°C hysteresis(seeFigure 3-2). The outputs are driven
active when the temperature crosses the set point
determined by the external resistor. As t emperature
declines below the set point, the hysteresis action wi ll
hold the outputs true until the temperature dr ops 2°C
below the threshold.

FIGURE 3-2: TC622/TC624

HYSTERESIS

Temperature

Set Point

(Set Point – 2 Degrees C)

OUT

OUT

FIGURE 3-1: PROGRAMMING

RESISTOR VALUES VS.
TEMPERATURE

250

(kΩ)

200

TRIP

150

100

RESISTANCE, R

50

-55 -35 -15 5 25 45 65 85 105 125

TEMPERATURE (˚C)



2002 Microchip TechnologyInc. DS21440B-page 5