Low Power Programmable Temperature Controller TMP01 FEATURES FUNCTIONAL BLOCK DIAGRAM 55C to +125C (67F to +257F) operation TEMPERATURE SENSOR 2.5V 1.0C accuracy over temperature (typ) SENSOR AND VREF 1 8 V+ VOLTAGE Temperature-proportional voltage output REFERENCE R1 User-programmable temperature trip points SET 2 7 OVER HIGH User-programmable hysteresis WINDOW R2 COMPARATOR 20 mA open-collector trip point outputs SET 3 6 UNDER LOW TTL/CMOS compatible R3 Single-supply operation (4.5 V to 13.2 V) GND 4 5 VPTAT HYSTERESIS PDIP, SOIC, and TO-99 packages GENERATOR TMP01 Figure 1. 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 that generates a voltage Hysteresis is also programmed by the external resistor chain output proportional to absolute temperature and a control and is determined by the total current drawn out of the 2.5 V signal from one of two outputs when the device is either above reference. This current is mirrored and used to generate a or below a specific temperature range. Both the high/low hysteresis offset voltage of the appropriate polarity after a temperature trip points and hysteresis (overshoot) band are comparator has been tripped. The comparators are connected determined by user-selected external resistors. For high volume in parallel, which guarantees that there is no hysteresis overlap production, these resistors are available on board. and eliminates erratic transitions between adjacent trip zones. The TMP01 consists of a band gap voltage reference combined The TMP01 utilizes proprietary thin-film resistors in conjunc- with a pair of matched comparators. The reference provides tion with production laser trimming to maintain a temperature both a constant 2.5 V output and a voltage proportional to accuracy of 1C (typical) over the rated temperature range, absolute temperature (VPTAT) which has a precise temperature with excellent linearity. The open-collector outputs are capable coefficient of 5 mV/K and is 1.49 V (nominal) at 25C. The of sinking 20 mA, enabling the TMP01 to drive control relays comparators compare VPTAT with the externally set tempera- directly. Operating from a 5 V supply, quiescent current is only ture trip points and generate an open-collector output signal 500 A (max). when one of their respective thresholds has been exceeded. The TMP01 is available in 8-pin mini PDIP, SOIC, and TO-99 packages. Rev. E 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 19932009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 00333-001TMP01 TABLE OF CONTENTS Features .............................................................................................. 1 Self-Heating Effects .................................................................... 10 Applications ....................................................................................... 1 Buffering the Voltage Reference ............................................... 10 Functional Block Diagram .............................................................. 1 Preserving Accuracy Over Wide Temperature Range Operation .................................................................................... 10 General Description ......................................................................... 1 Thermal Response Time ........................................................... 10 Revision History ............................................................................... 2 Switching Loads with the Open-Collector Outputs .............. 11 Specif icat ions ..................................................................................... 3 High Current Switching ............................................................ 12 TMP01EST, TMP01FP, TMP01FS ............................................. 3 Buffering the Temperature Output Pin ................................... 13 TMP01FJ ........................................................................................ 4 Differential Transmitter ............................................................. 13 Absolute Maximum Ratings ............................................................ 5 4 mA to 20 mA Current Loop .................................................. 13 Typical Performance Characteristics ............................................. 6 Temperature-to-Frequency Converter .................................... 14 Theory of Operation ........................................................................ 8 Isolation Amplifier ..................................................................... 15 Temperature Hysteresis ............................................................... 8 Out-of-Range Warning .............................................................. 15 Programming the TMP01 ........................................................... 8 Translating 5 mV/K to 10 mV/C ............................................ 16 Understanding Error Sources ..................................................... 9 Translating VPTAT to the Fahrenheit Scale ........................... 16 Safety Considerations in Heating and Cooling System Design ............................................................................................ 9 Outline Dimensions ....................................................................... 17 Applications Information .............................................................. 10 Ordering Guide .......................................................................... 18 REVISION HISTORY 7/09Rev. D to Rev. E Updated Format .................................................................. Universal Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 19 1/02Rev. C: Rev. D Edits to General Descriptions Section ........................................... 1 Edits to Specifications Section ........................................................ 2 Edits to Wafer Test Limits Section.................................................. 4 Edits to Dice Characteristics Section ............................................. 4 Edits to Ordering Guide .................................................................. 5 7/93Revision 0: Initial Version Rev. E Page 2 of 20