资料介绍
Programmable Switch Mode Controllers (PSMC) are
not just for switching power supplies. This technical
brief describes how to use the PIC16C781 PSMC in
combination with the Integrated Operational Amplifier,
Digital-to-Analog Converter (DAC), and gated timer to
construct a thermally operated air flow sensor with min-
imum external components. TB044
Sensing Air Flow with the PIC16C781
R7 is heated by R6. If moving air cools R6, the amount
Author: Ward Brown of heat transferred to R7 is reduced. The resistance of
Microchip Technology Inc. R7 falls with the temperature. As R7 resistance falls,
the voltage drop across R7 also falls. The Op Amp out-
put is directly proportional to the voltage across R7.
INTRODUCTION When the Op Amp ou
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