MPXY8020A

Freescale Semiconductor, Inc... MOTOROLA Freescale Semiconductor, Inc. SEMICONDUCTOR TECHNICAL DATA Order this document by MPXY8020A/D Tire Pressure Monitoring Sensor Temperature Compensated and Calibrated, Fully Integrated, Digital Output GENERAL DESCRIPTION The Motorola MPXY8020A is an 8–pin tire monitoring sensor which is comprised of a variable capacitance pressure sensing element, a temperature sensing element, and an interface circuit (with a wake–up feature) all on a single chip. It is housed in a Super–Small Outline Package (SSOP), which includes a media protection filter. Specifically designed for the low power consumption requirements of tire pressure monitoring systems, it can combine with a Motorola remote keyless entry (RKE) system to facilitate a low–cost highly integrated system. Detailed Description The block diagram of the MPXY8020A is shown in Figure 1. The pressure sensor is a capacitive transducer constructed using surface micromachining, the temperature sensor is constructed using a diffused resistor, and the interface circuit is integrated onto the same die as the sensors using a standard silicon CMOS process. The conditioning of the pressure signal begins with a capacitance to voltage conversion (C to V) followed by a switched capacitor amplifier. This amplifier has adjustable offset and gain trimming. The offset and gain are factory calibrated, with calibration values stored in the EEPROM trim register. This amplifier also has temperature compensa...