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TMP01FP Scheda tecnica(PDF) 1 Page - Analog Devices |
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TMP01FP Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 page FUNCTIONAL BLOCK DIAGRAM REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Low Power, Programmable Temperature Controller TMP01* © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES –55 C to +125 C (–67 F to +257 F) Operation 1.0 C Accuracy Over Temperature (typ) Temperature-Proportional Voltage Output User Programmable Temperature Trip Points User Programmable Hysteresis 20 mA Open Collector Trip Point Outputs TTL/CMOS Compatible Single-Supply Operation (4.5 V to 13.2 V) Low Cost 8-Pin DIP and SO Packages APPLICATIONS Over/Under Temperature Sensor and Alarm Board Level Temperature Sensing Temperature Controllers Electronic Thermostats Thermal Protection HVAC Systems Industrial Process Control Remote Sensors GENERAL DESCRIPTION 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 tempera- ture 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 abso- lute temperature (VPTAT) which has a precise temperature co- efficient of 5 mV/K and is 1.49 V (nominal) at +25 °C. The comparators compare VPTAT with the externally set tempera- ture trip points and generate an open-collector output signal when one of their respective thresholds has been exceeded. *Protected by U.S. Patent No. 5,195,827. Hysteresis is also programmed by the external resistor chain and is determined by the total current drawn out of the 2.5 V refer- ence. 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 conjunc- tion 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 di- rectly. Operating from a +5 V supply, quiescent current is only 500 µA (max). The TMP01 is available in the low cost 8-pin epoxy mini-DIP and SO (small outline) packages, and in die form. VPTAT V+ TEMPERATURE SENSOR & VOLTAGE REFERENCE 2.5V SENSOR 1 2 3 4 8 7 6 5 HYSTERESIS GENERATOR WINDOW COMPARATOR R1 TMP01 VREF SET HIGH SET LOW GND R2 R3 UNDER OVER |
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