The pressure transducer is the commonly most used kind of transducer in an industrial practice, mechanics transducer various in style, machinery type pressure transducer, semiconductor meet an emergency slices of pressure transducer, pigeonhole pressure transducer, electric capacity pressure transducer,etc. of hindering etc. for instance. The digital pressure gauge is a kind of application of the pressure transducer technology. This text mainly introduces the kind, characteristic and operation principle of the pressure transducer, introduce the pressure transducer MS5534B and carry on the design plan that the atmospheric pressure measures in the one-chip computer MSP430F449