1 TC07 3V LOGIC OUTPUT TEMPERATURE SENSOR WITH PROGRAMMABLE HYSTERESIS 2 FEATURES 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 – 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. ■ ■ ■ ■ 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 APPLICATIONS ■ ■ ■ ■ Power Supply Over-Temperature Detection Consumer Equipment Temperature Regulators Computer Equipment Package TC07COA TC07CUA TC07EOA TC07EUA TC07VOA TC07VUA 8-Pin SOIC 8-Pin MSOP 8-Pin SOIC 8-Pin MSOP 8-Pin SOIC 8-Pin MSOP 8-Pin SOIC 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 NC 1 8 VDD HSET 2 7 NC TSET 3 6 OUT GND 4 5 OUT TC07COA TC07EOA TC07VOA 5 8-Pin MSOP 6 FUNCTIONAL BLOCK DIAGRAM TEMP SENSOR + 4 PIN CONFIGURATION ORDERING INFORMATION Part No. 3 S Q NC 1 HSET TSET 3 GND 4 8 2 TC07CUA TC07EUA TC07VUA VDD 7 NC 6 OUT 5 OUT OUT TEMPERATURE TO VOLTAGE CONVERTER – 7 – OUT + R Q VOLTAGE REFERENCE GENERATOR TSET HSET VDD 8 GND TC07-1 9/18/96 TELCOM SEMICONDUCTOR, INC. 2-11 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 ......................... – 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: TA = Over Operational Temperature Range, unless otherwise specified. Symbol Parameter Conditions VDD IDD VOH VOL H TSET HSET Supply Voltage Range Supply Current Output Voltage (High) Output Voltage (Low) Minimum Hysteresis Absolute Accuracy Absolute Accuracy 2.7V < VCC < 5.5V IOUT = 500µA IOUT = 1mA HSET < TSET T = Programmed Temperature T = Programmed Temperature 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). TEMPERATURE TEMPERATURE SET BY RESISTOR ON TSET HYSTERESIS SET BY RESISTOR ON HSET OUT OUT Figure 1. TC07 Output Waveforms 2-12 Min Typ Max Unit 2.7 — 0.8 x VDD — –5 T–3 T–5 — 130 — — — T±1 T±1 5.5 300 — 0.25 x VDD — T+3 T+5 V µA V V °C °C °C 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 = Programming resistor value in Ohms = Desired trip point temperature in degrees Kelvin. For example, to program the TC07 outputs to go active at 50°C and inactive at 30°C, the TSET and HSET programming resistors are calculated as follows: TSET = 0.6 x ((50 + 273.15)2.13) = 132.8kΩ HSET = 0.6 x ((30 + 273.15)2.13) = 115.9kΩ 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 5°C lower than the temperature value programmed by TSET. That is: HSET ≤ TSET – 5°C. TELCOM SEMICONDUCTOR, INC. 3V LOGIC OUTPUT TEMPERATURE SENSOR WITH PROGRAMMABLE HYSTERESIS 1 TC07 Cooling and Heating Applications RESISTANCE (kΩ) 250 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. 200 150 100 50 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (°C) 2 3 Figure 2. Programming Resistor Values vs. Temperature +2.7 to 5.5V +2.7 to 5.5V RT 4 +12V +12V RH RH NC VDD HSET NC VDD NC + HEATER DC FAN NC HSET RT TC07 TC07 TSET OUT GND OUT LOGIC LEVEL MOSFET TSET OUT GND OUT LOGIC LEVEL MOSFET 5 TEMPERATURE TEMPERATURE 6 TSET HSET OUT TSET HSET 7 OUT FAN "ON" Figure 3. TC07 as a Fan Controller TELCOM SEMICONDUCTOR, INC. HEATER "ON" 8 Figure 4. TC07 as a Heater Thermostat 2-13