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TC07
3V LOGIC OUTPUT TEMPERATURE SENSOR WITH
PROGRAMMABLE HYSTERESIS
FEATURES
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User Programmable Hysteresis and Temperature
Set Point
Easily Programs with Two External Resistors
Wide Temperature Detection Range
TC07CxA ....................................... 0
°
C to +70
°
C
TC07ExA ................................ – 40
°
C to +85
°
C
TC07VxA ............................... – 40
°
C to +125
°
C
Small 8-Pin MSOP and 8-Pin SOIC Packages
Cost Effective
2
3
4
5
6
7
GENERAL DESCRIPTION
The TC07 is a programmable, logic output temperature
detector that operates from power supply levels as low as
2.7V. Programming is accomplished with external resistors
connected from the temperature setpoint input (T
SET
) and
the hysteresis control input (H
SET
) to V
DD
.
Complimentary outputs (OUT and OUT) are driven
active when temperature exceeds the temperature thresh-
old programmed by the resistor on T
SET
. The states of these
outputs are maintained (latched) until temperature falls
below threshold programmed by the resistor on H
SET
.
The TC07 is useful over a maximum temperature range
of – 40°C to +125°C (TC07VxA). It features low (<130µA)
supply current and small physical size 8-pin MSOP and
8-pin SOIC packages, making it suitable for a wide variety
of applications.
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APPLICATIONS
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Power Supply Over-Temperature Detection
Consumer Equipment
Temperature Regulators
Computer Equipment
ORDERING INFORMATION
Part No.
TC07COA
TC07CUA
TC07EOA
TC07EUA
TC07VOA
TC07VUA
Package
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
Temp. Range
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°C
PIN CONFIGURATION
8-Pin SOIC
NC
HSET
TSET
GND
1
2
3
4
TC07COA
TC07EOA
TC07VOA
8
7
6
5
VDD
NC
OUT
OUT
8-Pin MSOP
FUNCTIONAL BLOCK DIAGRAM
NC
TEMP
SENSOR
+
TEMPERATURE
TO VOLTAGE
CONVERTER
–
S
Q
OUT
1
2
3
4
8
7
VDD
NC
OUT
OUT
HSET
TSET
GND
TC07CUA
TC07EUA
TC07VUA
6
5
–
OUT
+
R
Q
VOLTAGE
REFERENCE
GENERATOR
T
SET
H
SET
V
DD
GND
TC07-1 9/18/96
8
2-11
TELCOM SEMICONDUCTOR, INC.
3V LOGIC OUTPUT TEMPERATURE
SENSOR WITH PROGRAMMABLE
HYSTERESIS
TC07
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ..............................................................7V
Input Voltage Any Input ...... (GND – 0.3V) to (V
DD
+ 0.3V)
Operating Temperature ......................... – 40°C to +125°C
Maximum Chip Temperature ................................. +150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
* 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.
ELECTRICAL CHARACTERISTICS:
T
A
= Over Operational Temperature Range, unless otherwise specified.
Symbol
V
DD
I
DD
V
OH
V
OL
H
T
SET
H
SET
Parameter
Supply Voltage Range
Supply Current
Output Voltage (High)
Output Voltage (Low)
Minimum Hysteresis
Absolute Accuracy
Absolute Accuracy
Conditions
2.7V < V
CC
< 5.5V
I
OUT
= 500µA
I
OUT
= 1mA
H
SET
< T
SET
T = Programmed Temperature
T = Programmed Temperature
Min
2.7
—
0.8 x V
DD
—
–5
T–3
T–5
Typ
—
130
—
—
—
T
±
1
T
±
1
Max
5.5
300
—
0.25 x V
DD
—
T+3
T+5
Unit
V
µA
V
V
°C
°C
°C
DETAILED DESCRIPTION
The TC07 programs with resistors connected from the
T
SET
and H
SET
inputs to V
DD
. Output pins OUT and OUT are
driven active when temperature exceeds the setting deter-
mined by the programming resistor on T
SET
. The outputs are
maintained (latched) in their active states until temperature
drops below the setting determined by the programming
resistor on H
SET
(Figure 1).
APPLICATIONS
Trip Point Programming
The resistor values required to achieve the desired
trip-point temperatures on T
SET
and H
SET
are calculated
using the formula below:
R
TRIP
= 0.6 x T
2.13
Where:
R
TRIP
T
TEMPERATURE
= Programming resistor value in Ohms
= Desired trip point temperature in degrees
Kelvin.
TEMPERATURE SET BY
RESISTOR ON T
SET
HYSTERESIS SET BY
RESISTOR ON H
SET
For example, to program the TC07 outputs to go active
at 50°C and inactive at 30°C, the T
SET
and H
SET
program-
ming resistors are calculated as follows:
T
SET
= 0.6 x ((50 + 273.15)
2.13
) = 132.8kΩ
H
SET
= 0.6 x ((30 + 273.15)
2.13
) = 115.9kΩ
Resistance values for T
SET
and H
SET
can be approxi-
mated using Figure 2. Care must be taken to ensure the
H
SET
programming resistor is a smaller value than the T
SET
programming resistor. The temperature programmed on
H
SET
must be at least 5°C lower than the temperature value
programmed by T
SET
. That is: H
SET
≤
T
SET
– 5°C.
TELCOM SEMICONDUCTOR, INC.
OUT
OUT
Figure 1. TC07 Output Waveforms
2-12
3V LOGIC OUTPUT TEMPERATURE
SENSOR WITH PROGRAMMABLE
HYSTERESIS
TC07
250
1
Cooling and Heating Applications
The TC07 can be used to control a DC fan as shown in
Figure 3. The fan turns on when the sensed temperature
rises above T
SET
and remains on until the temperature falls
below H
SET
. The amount of "over-cooling" performed by the
fan is dependent on the programmed hysteresis.
Figure 4 shows the TC07 acting as a heater thermostat.
Circuit operation is identical to that of the cooling fan
application.
RESISTANCE (kΩ)
200
2
3
4
150
100
50
-55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (°C)
Figure 2. Programming Resistor Values vs. Temperature
+2.7 to 5.5V
+12V
+2.7 to 5.5V
+12V
R
T
R
H
NC
V
DD
R
H
NC
V
DD
HEATER
R
T
H
SET
TC07
NC
+
DC FAN
H
SET
TC07
T
SET
NC
T
SET
OUT
OUT
LOGIC
LEVEL
MOSFET
GND
OUT
LOGIC
LEVEL
MOSFET
5
6
GND
OUT
TEMPERATURE
T
SET
TEMPERATURE
T
SET
H
SET
H
SET
7
HEATER "ON"
OUT
FAN "ON"
Figure 3. TC07 as a Fan Controller
OUT
Figure 4. TC07 as a Heater Thermostat
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TELCOM SEMICONDUCTOR, INC.
京公网安备 11010802033920号
EEWORLD
