The Motorola MPX4105 series Manifold Absolute Pressure (MAP) sensor for engine control is designed to sense absolute air pressure within the intake manifold. This measurement can be used to compute the amount of fuel required for each cylinder. The small form factor and high reliability of onchip integration makes the Motorola MAP sensor a logical and economical choice for automotive system designers. The MPX4105 series piezoresistive transducer is a stateoftheart, monolithic, signal conditioned silicon pressure sensor. This sensor with its patented transducer, combines advanced micromachining techniques, thin film metallization, and bipolar semiconductor processing to provide an accurate, high level analog output signal that is proportional to applied pressure. Figure 1 shows a block diagram of the internal circuitry integrated on a pressure sensor chip.