TC622/TC624
Low Cost Single Trip Point Temperature Sensor
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
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 -40°C to +125°C (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.
Applications:
•
•
•
•
•
Power Supply Over-Temperature Detection
Consumer Electronics
Fire/Heat Detection
UPSs, Amplifiers, Motors
CPU Thermal Management in PCs
Device Selection Table
Part Number
TC622COA
TC622CPA
TC622EAT
TC622EOA
TC622EPA
TC622VAT
TC622VOA
TC622VPA
TC624COA
TC624CPA
TC624EOA
TC624EPA
TC624VOA
TC624VPA
Voltage Operation
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
4.5V to 18V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
2.7V to 4.5V
Package
8-Pin SOIC
8-Pin PDIP
5-Pin TO-220
8-Pin SOIC
8-Pin PDIP
5-Pin TO-220
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
8-Pin SOIC
8-Pin PDIP
Ambient Temperature
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°
2001-2012 Microchip Technology Inc.
DS21440D-page 1
TC622/TC624
Package Type
PDIP
NC
OUT
OUT
GND
1
2
3
4
8
NC
V
DD
NC
T
SET
NC
OUT
OUT
GND
1
2
3
4
SOIC
8
NC
V
DD
NC
T
SET
SOT-220
TC622CPA
TC622EPA
TC622VPA
7
6
5
TC622COA
TC622EOA
TC622VOA
7
6
5
TC622EAT
TC622VAT
NC
OUT
OUT
GND
1
2
3
4
8
NC
NC
OUT
1
2
3
4
8
NC
V
DD
1 2 3 4 5
TC624CPA
TC624EPA
TC624VPA
OUT
OUT
+9V
OUT
GND
6
5
NC
T
SET
6
NC
5 T
SET
Note:
For TO-220 Package, Pin 3 is connected to case heatsink.
Functional Block Diagram
9V
Battery
R
SET
Horn
1
5
NC
T
SET
V
DD
7
Microcontrollers
NC
8
TC622
TC624
6
4
OUT
NC
GND
OUT
3
2
ALARM
DS21440D-page 2
2001-2012 Microchip Technology Inc.
GND
T
SET
V
DD
7
V
DD
TC624COA
TC624EOA
TC624VOA
7
TC622/TC624
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 specifi-
cations is not implied. Exposure to Absolute Maximum
Rating conditions for extended periods may affect
device reliability.
Absolute Maximum Ratings*
Supply Voltage (TC622) ......................................... 20V
(TC624) ........................................ 5.5V
Input Voltage Any Input .. (GND – 0.3V) to (V
DD
+0.3V)
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 ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
Over operating temperature range, unless otherwise specified.
Sym
V
DD
I
DD
V
OH
Parameter
Supply Voltage
Range
Supply Current
Output Voltage
(High)
Output Voltage
(Low)
Output Voltage
(High)
Output Voltage
(Low)
Device
TC622
TC624
TC622
TC624
Min
4.5
2.7
—
—
Typ
—
—
200
170
—
—
—
—
—
—
—
—
—
—
T±1
T±1
2
2
Max
18
4.5
600
300
—
—
0.15 x V
DD
0.30 x V
DD
0.35 x V
DD
—
—
0.1 x V
DD
0.2 x V
DD
0.25 x V
DD
T+5
T+5
—
—
V
Unit
V
A
V
5.0V
V
DD
18V
2.7V
V
DD
4.5V
5.0V
V
DD
18V, -40°C
T
A
+125°C,
I
OH
= 250
A
I
OH
= 500
A
-40°C
T
A
+85°C, I
OL
= 500
A
I
OL
= 1 mA
-40°C
T
A
+125°C, I
OL
= 1 mA
2.7V
V
DD
4.5V
-40°C
T
A
+125°C, I
OH
= 250
A
I
OH
= 500
A
-40°C
T
A
+85°C, I
OL
= 500
A
I
OL
= 1 mA
-40°C
T
A
+125°C, I
OL
= 1 mA
T
SET
= Programmed Temperature
T
SET
= Programmed Temperature
Test Conditions
TC622 0.90 x V
DD
0.80 x V
DD
V
OL
TC622
—
—
—
—
0.90 x V
DD
0.80 x V
DD
—
—
—
T-5
T-5
—
—
V
OH
TC624
V
V
V
OL
TC624
T
SET
Absolute Accuracy TC622
TC624
OUT Trip Point
Hysteresis
TC622
TC624
°C
°C
2001-2012 Microchip Technology Inc.
DS21440D-page 3
TC622/TC624
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
OUT
OUT
GND
T
SET
NC
V
DD
NC
No Internal Connection.
Active low output.
Active high output.
Ground Terminal.
Temperature set point. Connect an external 1% resistor from T
SET
to V
CC
to set
trip point.
No Internal Connection.
Power supply input.
No Internal Connection.
Description
Pin No.
(5-Pin SOT-220)
1
2
3
4
5
Symbol
OUT
OUT
V
DD
GND
T
SET
Active low output.
Active high output.
Power supply input.
Ground Terminal.
Description
Temperature set point. Connect an external 1% resistor from T
SET
to V
CC
to set
trip point.
DS21440D-page 4
2001-2012 Microchip Technology Inc.
TC622/TC624
3.0
3.1
DETAILED DESCRIPTION
Trip Point Programming
3.2
Hysteresis
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.
To prevent output “chattering” at the trip point tempera-
ture, the temperature detector in the TC622/TC624 has
2°C 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 2°C
below the threshold.
Temperature
EQUATION 3-1:
R
TRIP
= 0.5997 x T
2.1312
Set Point
(Set Point – 2 Degrees C)
Where:
R
TRIP
= Programming resistor value in Ohms
T = Desired trip temperature in degrees Kelvin.
OUT
For example, as shown in Figure 3-1, to program the
device to trip at 50°C, the programming resistor is:
R
TRIP
= 0.5997 x ((50 + 273.15)
2.1312
) = 133.65 k
OUT
FIGURE 3-2:
TC622/TC624 Hysteresis
250
RESISTANCE, R
TRIP
(kΩ)
200
150
100
50
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (°C)
FIGURE 3-1:
Programming Resistor
Values vs. Temperature
2001-2012 Microchip Technology Inc.
DS21440D-page 5
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