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TMP12GBC 데이터시트(PDF) 1 Page - Analog Devices |
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TMP12GBC 데이터시트(HTML) 1 Page - Analog Devices |
1 / 14 page REV. 0 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 Airflow and Temperature Sensor TMP12* © 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 Temperature Sensor Includes 100 Ω Heater Heater Provides Power IC Emulation Accuracy 3 °C typ. from 40°C to 100°C Operation to 150 °C 5 mV/ °C Internal Scale-Factor Resistor Programmable Temperature Setpoints 20 mA Open-Collector Setpoint Outputs Programmable Thermal Hysteresis Internal 2.5 V Reference Single 5 V Operation 400 µA Quiescent Current (Heater OFF) Minimal External Components APPLICATIONS System Airflow Sensor Equipment Over-Temperature Sensor Over-Temperature Protection Power Supply Thermal Sensor Low-Cost Fan Controller GENERAL DESCRIPTION The TMP12 is a silicon-based airflow and temperature sensor designed to be placed in the same airstream as heat generating components that require cooling. Fan cooling may be required continuously, or during peak power demands, e.g. for a power supply, and if the cooling systems fails, system reliability and/or safety may be impaired. By monitoring temperature while emu- lating a power IC, the TMP12 can provide a warning of cooling system failure. The TMP12 generates an internal voltage that is linearly pro- portional to Celsius (Centigrade) temperature, nominally 5 mV/ °C. The linearized output is compared with voltages from an external resistive divider connected to the TMP12’s 2.5 V precision reference. The divider sets up one or two refer- ence voltages, as required by the user, providing one or two temperature setpoints. Comparator outputs are open-collector transistors able to sink over 20 mA. There is an on-board hys- teresis generator provided to speed up the temperature-setpoint output transitions, this also reduces erratic output transitions in noisy environments. Hysteresis is programmed by the external resistor chain and is determined by the total current drawn from the 2.5 V reference. The TMP12 airflow sensor also incorpo- rates a precision, low temperature coefficient 100 Ω heater resistor that may be connected directly to an external 5 V sup- ply. When the heater is activated it raises the die temperature in the DIP package approximately 20 °C above ambient (in still air). The purpose of the heater in the TMP12 is to emulate a power IC, such as a regulator or Pentium CPU which has a high internal dissipation. When subjected to a fast airflow, the package and die tempera- tures of the power device and the TMP12 (if located in the same airstream) will be reduced by an amount proportional to the rate of airflow. The internal temperature rise of the TMP12 may be reduced by placing a resistor in series with the heater, or reducing the heater voltage. The TMP12 is intended for single 5 V supply operation, but will operate on a 12 V supply. The heater is designed to operate from 5 V only. Specified temperature range is from 40 °C to 125°C, operation extends to 150 °C at 5 V with reduced accuracy. The TMP12 is available in 8-pin plastic DIP and SO packages. FUNCTIONAL BLOCK DIAGRAM VREF OVER 1k Ω + - V+ GND SET HIGH HEATER HYSTERESIS VOLTAGE WINDOW COMPARATOR CURRENT MIRROR HYSTERESIS CURRENT VOLTAGE REFERENCE AND SENSOR IHYS + - UNDER SET LOW 100 Ω PINOUTS DIP And SO TOP VIEW (Not to Scale) 8 V+ 1 VREF 7 OVER 2 SET HIGH 6 UNDER SET LOW 3 5 HEATER GND 4 *Protected by U.S. Patent No. 5,195,827. |
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