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MPXY8040A Datasheet(PDF) 1 Page - Motorola, Inc |
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MPXY8040A Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 16 page MPXY8000 Rev 1, 12/2004 Freescale Semiconductor Technical Data © Freescale Semiconductor, Inc., 2004. All rights reserved. Tire Pressure Monitoring Sensor Temperature Compensated and Calibrated, Fully Integrated, Digital Output The Freescale Semiconductor MPXY8000 series sensor 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 Freescale Semiconductor remote keyless entry (RKE) system to facilitate a low-cost, highly integrated system. Detailed Description The block diagram of the MPXY8000 series sensor 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 compensation circuits for both sensitivity and offset, which also are factory adjusted using the EEPROM trim register. The pressure is monitored by a voltage comparator, which compares the measured value against an 8-bit threshold adjusted by a serial input. By adjusting the threshold and monitoring the state of the OUT pin the external device can check whether a low-pressure threshold has been crossed, or perform up to 8-bit A/D conversions. The temperature is measured by a diffused resistor with a positive temperature coefficient driven by a current source, thereby creating a voltage. The room temperature value of this voltage is factory calibrated using the EEPROM trim register. A two-channel multiplexer can route either the pressure or temperature signal to a sampling capacitor that is monitored by a voltage comparator with variable threshold adjust, providing a digital output for temperature. An internal low frequency, low power 5.4 kHz oscillator with a 14-stage divider provides a periodic pulse to the OUT pin (divide by 16384 for 3 seconds). This pulse can be used to wake up an external MCU to begin an interface with the device. An additional 10-stage divider will provide a pulse every 52 minutes which can be used to reset an external MCU. The power consumption can be controlled by several operational modes selected by external pins. MPXY8020A MPXY8040A SUPER SMALL OUTLINE PACKAGE CASE 1352-03 PIN ASSIGNMENT TIRE PRESSURE MONITORING SENSOR MPXY8020A: OPTIMIZED FOR 250 kPa – 450 kPa MPXY8040A: OPTIMIZED FOR 500 kPa – 900 kPa S1/VPP 1 VDD 2 VSS 3 OUT 4 8-pin Super Small Outline Package (SSOP) 8 SO 7 CLK 6 DATA 5 RST ORDERING INFORMATION Shipped In Rails Shipped in Tape & Reel MPXY8020A6U MPXY8040A6U MPXY8020A6T1 MPXY8040A6T1 |
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