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MPXY8021A6U Datasheet

  • MPXY8021A6U

  • Tire Pressure Monitoring Sensor

  • 16頁

  • MOTOROLA   MOTOROLA

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MOTOROLA
Freescale Semiconductor, Inc.
Order Number: MPXY8021A
Rev. 0, 07/2004
SEMICONDUCTOR TECHNICAL DATA
Tire Pressure Monitoring Sensor
Temperature Compensated and
Calibrated, Fully Integrated,
Digital Output
General Description
The Motorola 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 Motorola 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
TIRE PRESSURE
MONITORING SENSOR
MPXY8021A:
OPTIMIZED FOR 250 kPa 鈥?450 kPa
Freescale Semiconductor, Inc...
SUPER SMALL OUTLINE PACKAGE
CASE 1352-03
PIN ASSIGNMENT
S1/V
PP
1
V
DD
2
V
SS
3
OUT 4
8 SO
7 CLK
6 DATA
5 RST
8-pin Super Small Outline Package (SSOP)
ORDERING INFORMATION
Shipped In Rails
MPXY8021A6U
Shipped in Tape &
Reel
MPXY8021A6T1
REV 0
漏 Motorola, Inc. 2004
For More Information On This Product,
Go to: www.freescale.com

MPXY8021A6U 產(chǎn)品屬性

  • 65

  • 傳感器，轉(zhuǎn)換器

  • 壓力

  • MPXY8021

  • 絕對(duì)

  • 36.26 ~ 65.27 PSI，250 ~ 450 kPa

  • -

  • 數(shù)字

  • -

  • -

  • PCB

  • -40°C ~ 125°C

  • 8-SOIC（0.295"，7.50mm 寬）

  • -

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