MRF136Y Motorola, MRF136Y Datasheet

MRF136Y

Manufacturer Part Number

MRF136Y

Description

Manufacturer

Motorola

Datasheets

1.MRF136Y.pdf (12 pages)

2.MRF136Y.pdf (16 pages)

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SEMICONDUCTOR TECHNICAL DATA

GENERAL DESCRIPTION

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

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.

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.

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.

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.

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.

selected by external pins.

REV 1.0

Motorola, Inc. 2003

Motorola Sensor Device Data

The Motorola MPXY8020A is an 8–pin tire monitoring sensor which is

The block diagram of the MPXY8020A is shown in Figure 1. The pressure

The conditioning of the pressure signal begins with a capacitance to voltage

The pressure is monitored by a voltage comparator, which compares the

The temperature is measured by a diffused resistor with a positive

An internal low frequency, low power 5.4 kHz oscillator with a 14–stage

The power consumption can be controlled by several operational modes

Shipped in Rails Shipped in Tape & Reel

MPXY8020A6U

OPTIMIZED FOR 250 kPa – 450 kPa

SUPER SMALL OUTLINE PACKAGE

TIRE PRESSURE MONITORING

ORDERING INFORMATION

CASE 1352

SENSOR

MPXY8020A6T1

Order this document

by MPXY8020A/D

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