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TC07 3V LOGIC OUTPUT TEMPERATURE SENSOR WITH PROGRAMMABLE HYSTERESIS
FEATURES
s s s User Programmable Hysteresis and Temperature Set Point Easily Programs with Two External Resistors Wide Temperature Detection Range TC07CxA ....................................... 0C to +70C TC07ExA ................................ - 40C to +85C TC07VxA ............................... - 40C to +125C 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 (TSET) and the hysteresis control input (HSET) to VDD. Complimentary outputs (OUT and OUT) are driven active when temperature exceeds the temperature threshold programmed by the resistor on TSET. The states of these outputs are maintained (latched) until temperature falls below threshold programmed by the resistor on HSET. The TC07 is useful over a maximum temperature range of - 40C to +125C (TC07VxA). It features low (<130A) supply current and small physical size 8-pin MSOP and 8-pin SOIC packages, making it suitable for a wide variety of applications.
s s
APPLICATIONS
s s s s 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 0C to +70C 0C to +70C - 40C to +85C - 40C to +85C - 40C to +125C - 40C to +125C
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
TSET
HSET
VDD
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 (VDD + 0.3V) Operating Temperature ......................... - 40C to +125C Maximum Chip Temperature ................................. +150C Storage Temperature ............................ - 65C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C
* 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: TA = Over Operational Temperature Range, unless otherwise specified.
Symbol
VDD IDD VOH VOL H TSET HSET
Parameter
Supply Voltage Range Supply Current Output Voltage (High) Output Voltage (Low) Minimum Hysteresis Absolute Accuracy Absolute Accuracy
Conditions
2.7V < VCC < 5.5V IOUT = 500A IOUT = 1mA HSET < TSET T = Programmed Temperature T = Programmed Temperature
Min
2.7 -- 0.8 x VDD -- -5 T-3 T-5
Typ
-- 130 -- -- -- T1 T1
Max
5.5 300 -- 0.25 x VDD -- T+3 T+5
Unit
V A V V C C C
DETAILED DESCRIPTION
The TC07 programs with resistors connected from the TSET and HSET inputs to VDD. Output pins OUT and OUT are driven active when temperature exceeds the setting determined by the programming resistor on TSET. The outputs are maintained (latched) in their active states until temperature drops below the setting determined by the programming resistor on HSET (Figure 1).
APPLICATIONS Trip Point Programming
The resistor values required to achieve the desired trip-point temperatures on TSET and HSET are calculated using the formula below: RTRIP = 0.6 x T 2.13 Where: RTRIP T
TEMPERATURE
= Programming resistor value in Ohms = Desired trip point temperature in degrees Kelvin.
TEMPERATURE SET BY RESISTOR ON TSET HYSTERESIS SET BY RESISTOR ON HSET
For example, to program the TC07 outputs to go active at 50C and inactive at 30C, the TSET and HSET programming resistors are calculated as follows: TSET = 0.6 x ((50 + 273.15)2.13) = 132.8k HSET = 0.6 x ((30 + 273.15)2.13) = 115.9k Resistance values for TSET and HSET can be approximated using Figure 2. Care must be taken to ensure the HSET programming resistor is a smaller value than the TSET programming resistor. The temperature programmed on HSET must be at least 5C lower than the temperature value programmed by TSET. That is: HSET TSET - 5C. 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 TSET and remains on until the temperature falls below HSET. 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 (k)
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
RT
RH NC VDD
RH NC VDD HEATER RT HSET TC07 NC
+
DC FAN
HSET TC07 TSET
NC
TSET
OUT
OUT LOGIC LEVEL MOSFET
GND OUT
LOGIC LEVEL MOSFET
5 6
GND
OUT
TEMPERATURE
TSET
TEMPERATURE
TSET
HSET
HSET
7
HEATER "ON"
OUT FAN "ON"
Figure 3. TC07 as a Fan Controller
OUT
Figure 4. TC07 as a Heater Thermostat 2-13
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TELCOM SEMICONDUCTOR, INC.

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