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MPXY8021A Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc

Part No. MPXY8021A
Description  Tire Pressure Monitoring Sensor Temperature Compensated and Calibrated, Fully Integrated, Digital Output
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MPXY8021A Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc

 
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Document Number: MPXY8021A
Rev 2, 02/2006
Freescale Semiconductor
Technical Data
© Freescale Semiconductor, Inc., 2006. All rights reserved.
Tire Pressure Monitoring Sensor
Temperature Compensated and
Calibrated, Fully Integrated,
Digital Output
The Freescale Semiconductor, Inc. MPXY8021A 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 remote keyless entry (RKE) system
to facilitate a low-cost, highly integrated system.
DETAILED DESCRIPTION
The block diagram of the MPXY8021A 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.
MPXY8021A
SUPER SMALL OUTLINE PACKAGE
CASE 1352-03
PIN ASSIGNMENT
TIRE PRESSURE
MONITORING SENSOR
MPXY8021A:
OPTIMIZED FOR 250 kPA – 450 kPA
8-pin Super Small Outline Package (SSOP)
ORDERING INFORMATION
Shipped in Rails
Shipped in Tape &
Reel
MPXY8021A6U
MPXY8021A6T1
1
2
4
3
S1NPP
VDD
VSS
OUT
8
7
5
6
RST
DATA
CLK
SO


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