TMP01 |
RFQ for TMP01 Required Field |
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| Technical/Catalog Information | TMP01ES |
| Vendor | Analog Devices Inc |
| Category | Sensors, Transducers |
| Voltage - Supply | 4.5 V ~ 13.2 V |
| Package / Case | 8-SOIC (3.9mm Width) |
| Packaging | Tube |
| Output Type | Voltage |
| Sensing Temperature | -55°C ~ 125°C |
| Drawing Number | * |
| RoHS Status | RoHS Non-Compliant |
| Other Names | TMP01ES TMP01ES |
| Product | Manufacturers | Pack | D/C |
| TMP01 | - | SOP-8 | - |
Most temperature-controller circuits use upper and lower trip points to control a heater element, with the heater power full on and full off. Usually, this results in a temperature hysteresis of several degrees. This relatively large temperature hysteresis effect might cause modulation in the output of the circuit that's being controlled.
A proportional temperature controller eliminates this problem by continuously providing the power needed to maintain the "oven" at the desired temperature-within 1℃. From a cold start, maximum power is applied until the temperature is within 2℃ of the set point.
The circuit's mechanical construction is important. The five heater resistors (R12 through R16), the temperature-sensor IC (U1), and the circuit being controlled are mounted with thermal epoxy to a small piece of aluminum. This provides excellent heat transfer between the components. The heater resistors must be selected to raise the temperature from ambient to the set point within an acceptable warm-up time.
U1 is Analog Devices' TMP-01 temperature- controller IC. The voltage proportional to absolute temperature (VPTAT) has a temperature coefficient of exactly 5 mV/℃. The set point is determined by the R1/R2 ratio. U2 is a Linear Technology LT1014 quad precision op amp. U2C is an oscillator with a 50% duty cycle that supplies a triangle wave between 1/3 and 2/3 of the supply voltage at U2-2
U2B compares the amplified VPTAT to the triangle wave, which drives Q1 at a duty cycle of 100% or less. Because the triangle wave's peak-to-peak amplitude is 2.7 V, and VPTAT is amplified by a factor of 300, a temperature change of approximately 2 mV moves the duty cycle from 100% to 0%.
The TMP01 is a temperature sensor which generates a voltage output proportional to absolute temperature and a control signal from one of two outputs when the device is either above or below a specific temperature range. Both the high/low temperature trip points and hysteresis (overshoot) band are determined by user-selected external resistors. For high volume production, these resistors are available on-board.
The TMP01 consists of a bandgap voltage reference combined with a pair of matched comparators. The reference provides both a constant 2.5 V output and a voltage proportional to absolute temperature (VPTAT) which has a precise temperature coefficient of 5 mV/K and is 1.49 V (nominal) at +25°C. The comparators compare VPTAT with the externally set temperature trip points and generate an open-collector output signal when one of their respective thresholds has been exceeded.
Hysteresis is also programmed by the external resistor chain and is determined by the total current drawn out of the 2.5 V reference. This current is mirrored and used to generate a hysteresis offset voltage of the appropriate polarity after a comparator has been tripped. The comparators are connected in parallel, which guarantees that there is no hysteresis overlap and eliminates erratic transitions between adjacent trip zones.
The TMP01 utilizes proprietary thin-film resistors in conjunction with production laser trimming to maintain a temperature accuracy of ±1°C (typ) over the rated temperature range, with excellent linearity. The open-collector outputs are capable of sinking 20 mA, enabling the TMP01 to drive control relays directly. Operating from a +5 V supply, quiescent current is only 500 mA (max).
The TMP01 is available in the low cost 8-pin epoxy mini-DIP and SO (small outline) packages, and in die form.
Typical Application
Features
Over/Under Temperature Sensor and AlarmBoard Level Temperature SensingTemperature ControllersElectronic ThermostatsThermal ProtectionHVAC SystemsIndustrial Process ControlRemote Sensors
55 to +125 (67 to +257) Operation±1.0 Accuracy Over Temperature (typ)Temperature-Proportional Voltage OutputUser Programmable Temperature Trip PointsUser Programmable Hysteresis20 mA Open Collector Trip Point OutputsTTL/CMOS CompatibleSingle-Supply Operation (4.5 V to 13.2 V)Low Cost 8-Pin DIP and SO Packages
Maximum Ratings
Maximum Supply Voltage . . . . . . . . . . . . . . . . . . . 0.3 V to +15 V
Maximum Input Voltage
(SETHIGH, SETLOW) . . . . . . . . . . . . . . . .0.3 V to [(V+) +0.3 V]
Maximum Output Current (VREF, VPTAT) . . . . . . . . . . . . . . . . 2 mA
Maximum Output Current (Open Collector Outputs) . . . . . . 50 mA
Maximum Output Voltage (Open Collector Outputs) . . . . . . . . 15 V
Operating Temperature Range . . . . . . . . . . . . 55°C to +150°C
Dice Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range . . . . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . . . +300°C
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