2002 Microchip Technology Inc.
DS21440B-page 1
TC622/TC624
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
Applications
Power Supply Over-Temperature Detection
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 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.
Device Selection Table
Part Number
Voltage Operation
Package
Ambient Temperature
TC622COA
4.5V to 18V
8-Pin SOIC
0C to +70C
TC622CPA
4.5V to 18V
8-Pin PDIP
0C to +70C
TC622EAT
4.5V to 18V
5-Pin TO-220
-40C to +85C
TC622EOA
4.5V to 18V
8-Pin SOIC
-40C to +85C
TC622EPA
4.5V to 18V
8-Pin PDIP
-40C to +85C
TC622VAT
4.5V to 18V
5-Pin TO-220
-40C to +125C
TC622VOA
4.5V to 18V
8-Pin SOIC
-40C to +125C
TC622VPA
4.5V to 18V
8-Pin PDIP
-40C to +125C
TC624COA
2.7V to 4.5V
8-Pin SOIC
0C to +70C
TC624CPA
2.7V to 4.5V
8-Pin PDIP
0C to +70C
TC624EOA
2.7V to 4.5V
8-Pin SOIC
-40C to +85C
TC624EPA
2.7V to 4.5V
8-Pin PDIP
-40C to +85C
TC624VOA
2.7V to 4.5V
8-Pin SOIC
-40C to +125C
TC624VPA
2.7V to 4.5V
8-Pin PDIP
-40C to +125
Low Cost Single Trip Point Temperature Sensor
TC622/TC624
DS21440B-page 2
2002 Microchip Technology Inc.
Package Type
Functional Block Diagram
GND
NC
OUT
OUT
NC
NC
V
DD
V
DD
GND
NC
T
SET
T
SET
NC
OUT
OUT
NC
GND
NC
OUT
OUT
NC
NC
V
DD
T
SET
GND
NC
OUT
OUT
NC
NC
V
DD
T
SET
V
DD
T
SET
OUT
OUT
GND
1 2 3 4 5
TC622EAT
TC622VAT
8
7
6
5
1
2
3
4
1
8
2
7
3
6
4
5
8
7
6
5
1
2
3
4
1
8
2
7
3
6
4
5
TC622CPA
TC622EPA
TC622VPA
TC624CPA
TC624EPA
TC624VPA
TC622COA
TC622EOA
TC622VOA
TC624COA
TC624EOA
TC624VOA
PDIP
SOT-220
SOIC
Note: For TO-220 Package, Pin 3 is connected to case heatsink.
TC622
R
SET
+9V
T
SET
GND
V
DD
OUT
NC
OUT
NC
NC
1
3
4
5
6
7
8
Microcontrollers
ALARM
Horn
9V
Battery
TC624
2
2002 Microchip Technology Inc.
DS21440B-page 3
TC622/TC624
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage (TC622) ......................................... 20V
(TC624) ........................................ 5.5V
Input Voltage Any Input .. (GND 0.3V) to (V
DD
+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
Stresses above those listed under "Absolute Maximum Rat-
ings" 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. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability
.
.
TC622/TC624 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Over operating temperature range, unless otherwise specified.
Symbol
Parameter
Device
Min
Typ
Max
Unit
Test Conditions
V
DD
Supply Voltage Range
TC622
TC624
4.5
2.7
--
--
18
4.5
V
I
DD
Supply Current
TC622
TC624
--
--
200
170
600
300
A
5.0V
V
DD
18V
2.7V
V
DD
4.5V
V
OH
Output Voltage (High)
TC622
0.90 x V
DD
0.80 x V
DD
--
--
--
--
V
5.0V
V
DD
18V, -40C
T
A
+125C,
I
OH
= 250
A
I
OH
= 500
A
V
OL
Output Voltage (Low)
TC622
--
--
--
--
--
--
0.15 x V
DD
0.30 x V
DD
0.35 x V
DD
V
-40C
T
A
+85C, I
OL
= 500
A
I
OL
= 1mA
-40C
T
A
+125C, I
OL
= 1mA
V
OH
Output Voltage (High)
TC624
--
0.90 x V
DD
0.80 x V
DD
--
--
--
--
V
2.7V
V
DD
4.5V
-40C
T
A
+125C, I
OH
= 250
A
I
OH
= 500
A
V
OL
Output Voltage (Low)
TC624
--
--
--
--
--
--
0.1 x V
DD
0.2 x V
DD
0.25 x V
DD
V
-40C
T
A
+85C, I
OL
= 500
A
I
OL
= 1mA
-40C
T
A
+125C, I
OL
= 1mA
T
SET
Absolute Accuracy
TC622
TC624
T - 5
T - 5
T 1
T 1
T + 5
T + 5
C
T
SET
= Programmed Temperature
T
SET
= Programmed Temperature
OUT
Trip Point Hysteresis
TC622
TC624
--
--
2
2
--
--
C
TC622/TC624
DS21440B-page 4
2002 Microchip Technology Inc.
2.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(8-Pin SOIC)
(8-Pin PDIP)
Symbol
Description
1
NC
No Internal Connection.
2
OUT
Active low output.
3
OUT
Active high output.
4
GND
Ground Terminal.
5
T
SET
Temperature set point. Connect an external 1% resistor from T
SET
to V
CC
to set trip
point.
6
NC
No Internal Connection.
7
V
DD
Power supply input.
8
NC
No Internal Connection.
Pin No.
(5-Pin SOT-220)
Symbol
Description
1
OUT
Active low output.
2
OUT
Active high output.
3
V
DD
Power supply input.
4
GND
Ground Terminal.
5
T
SET
Temperature set point. Connect an external 1% resistor from T
SET
to V
CC
to set trip
point.
2002 Microchip Technology Inc.
DS21440B-page 5
TC622/TC624
3.0
DETAILED DESCRIPTION
3.1
Trip Point Programming
When the temperature of the device exceeds the pro-
grammed temperature trip point, T
SET
, 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 T
SET
input and V
CC
. The relationship between the resistor
value and the trip point temperature is given by
Equation 3-1.
EQUATION 3-1:
For example, as shown in Figure 3-1, to program the
device to trip at 50C, the programming resistor is:
FIGURE 3-1:
PROGRAMMING
RESISTOR VALUES VS.
TEMPERATURE
3.2
Hysteresis
To prevent output "chattering" at the trip point tempera-
ture, 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
R
TRIP
= 0.5997 x T
2.1312
Where:
R
TRIP
= Programming resistor value in Ohms
T = Desired trip temperature in degrees Kelvin.
R
TRIP
= 0.5997 x ((50 + 273.15)
2.1312
) = 133.65k
TEMPERATURE (C)
RESISTANCE, R
TRIP
(k
)
-55
-35
-15
5
25
45
65
85
105
125
50
100
150
200
250
Set Point
Temperature
OUT
(Set Point 2 Degrees C)
OUT
TC622/TC624
DS21440B-page 6
2002 Microchip Technology Inc.
4.0
TYPICAL APPLICATIONS
4.1
Over-Temperature Shutdown
The TC622 can be used to create a simple over-tem-
perature 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 R
TRIP
. 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.
4.2
Cooling and Heating Applications
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 T
SET
- 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
Circuit Board
TC622 Heatsink Mounting
TC622
TC622
R
TRIP
V
CC
Output Device
Heatsink Surface
Power Good
Signal
OVERTEMP
Crowbar
Circuit
T
SET
GND
V
DD
V
OUT
OUT
OUT
Output
Device
2002 Microchip Technology Inc.
DS21440B-page 7
TC622/TC624
FIGURE 4-2:
TC624 AS A FAN
CONTROLLER FOR
NOTEBOOK PC
FIGURE 4-3:
TC622 AS A HEATER
THERMOSTAT
TC624
R
SET
+2.7 to 4.5V +12V
T
SET
GND
V
DD
OUT
NC
N-Channel
Logic Level
MOSFET
DC Fan
OUT
NC
NC
1
3
4
5
6
7
8
Temperature
OUT
Fan "On"
T
SET
2 C
T
SET
+
2
TC622
R
SET
+4.5 to 18.0V
+12V
T
SET
GND
V
DD
OUT
NC
N-Channel
Level Logic
MOSFET
OUT
1
2
4
5
6
7
8
NC
NC
Temperature
OUT
Heater "On"
T
SET
2 C
T
SET
Heater
TC622/TC624
DS21440B-page 8
2002 Microchip Technology Inc.
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
Package marking data not available at this time.
5.2
Taping Form
5.3
Package Dimensions
Component Taping Orientation for 8-Pin SOIC (Narrow) Devices
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
8-Pin SOIC (N)
12 mm
8 mm
2500
13 in
Carrier Tape, Number of Components Per Reel and Reel Size
Standard Reel Component Orientation
for TR Suffix Device
PIN 1
User Direction of Feed
P
W
3
MIN.
PIN 1
.260 (6.60)
.240 (6.10)
.045 (1.14)
.030 (0.76)
.070 (1.78)
.040 (1.02)
.400 (10.16)
.348 (8.84)
.200 (5.08)
.140 (3.56)
.150 (3.81)
.115 (2.92)
.110 (2.79)
.090 (2.29)
.022 (0.56)
.015 (0.38)
.040 (1.02)
.020 (0.51)
.015 (0.38)
.008 (0.20)
.310 (7.87)
.290 (7.37)
.400 (10.16)
.310 (7.87)
8-Pin Plastic DIP
Dimensions: inches (mm)
2002 Microchip Technology Inc.
DS21440B-page 9
TC622/TC624
5.4
Package Dimensions (Continued)
.050 (1.27) TYP.
8
MAX.
PIN 1
.244 (6.20)
.228 (5.79)
.157 (3.99)
.150 (3.81)
.197 (5.00)
.189 (4.80)
.020 (0.51)
.013 (0.33)
.010 (0.25)
.004 (0.10)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
.050 (1.27)
.016 (0.40)
.
8-Pin SOIC
Dimensions: inches (mm)
5-Pin TO-220
.273 (6.93)
.263 (6.68)
.037 (0.95)
.025 (0.64)
.117 (2.97)
.103 (2.62)
.415 (10.54)
.390 (9.91)
.156 (3.96)
.140 (3.56)
DIA.
.293 (7.44)
.204 (5.18)
.590 (14.99)
.482 (12.24)
.072 (1.83)
.062 (1.57)
PIN 1
.185 (4.70)
.165 (4.19)
.055 (1.40)
.045 (1.14)
.613 (15.57)
.569 (14.45)
.115 (2.92)
.087 (2.21)
.025 (0.64)
.012 (0.30)
3
- 7.5
5 PLCS.
Dimensions: inches (mm)
TC622/TC624
DS21440B-page 10
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc.
DS21440B-page 9
TC622/TC624
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
Your local Microchip sales office
2.
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3.
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.
TC622/TC624
DS21440B-page 10
2002 Microchip Technology Inc.
NOTES:
2002 Microchip Technology Inc.
DS21440B-page 11
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 com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.
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The Microchip name and logo, the Microchip logo, FilterLab,
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L
OQ
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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
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Serialized Quick Turn Programming (SQTP) is a service mark
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2002, Microchip Technology Incorporated, Printed in the
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DS21440B-page 12
2002 Microchip Technology Inc.
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03/01/02
W
ORLDWIDE
S
ALES
AND
S
ERVICE
*DS21440B*
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