Freescale Tire Pressure Monitoring System

Freescale Semiconductor offers a tire pressure monitoring system (TPMS) that contains a capacitive pressure sensor for ultra-low power consumption and precise sensing. Freescale’s MPXY8300 system-in-package device provides a highly integrated, cost-effective solution that combines an advanced pressure sensor with an 8-bit microcontroller (MCU), 2-axis accelerometer, and radio frequency (RF).

Freescale’s MPXY8300 single-package solution is designed to address global motor vehicle safety requirements for accurate, timely tire pressure monitoring. Properly inflated tires can help reduce the potential for life-threatening blowouts, enhance road handling, improve fuel efficiency, prolong tire life ,and lower the cost of vehicle ownership.

Freescale’s MPXY8300 TPMS solution is designed to help drivers maintain proper tire pressure by instantly notifying them when any individual tire (including the spare) is not at the optimal pressure level. Engineered for wheel-mounted applications, the highly integrated MPXY8300 system helps automotive engineers reduce development cycle time, component count and system cost by combining the necessary digital, analog and sensor functions of a TPMS in a single, compact package.

Freescale’s intelligent MPXY8300 system offers precise, real-time tire pressure measurement using direct monitoring at each wheel. Additionally, Freescale’s single-package solution has an integrated accelerometer for motion detection. The system can be programmed to transmit measurements at certain tire rotation speeds and even when the tires are not rotating at all.

The MPXY8300 system-in-package device features these key components:

  • 8-bit MCU with 512b RAM, 16 KB flash
  • Pressure and temperature sensors for compensating tire pressure
  • Low-frequency input for receiving diagnostic commands
  • XZ-axis accelerometer
  • RF transmitter

MPXY8300 system features:

  • Highly integrated system-in-package device
  • Accelerometer for motion detection
  • Power management specific to TPMS for more than 10-year battery life
  • 8-bit MCU with 512b RAM, 16 KB flash and multiple low-power timing functions
  • Pressure sensor with two pressure range options:
    • Passenger cars: 100-800 kPa
    • Heavy duty trucks: 100-1500 kPa
  • Capacitive sensor technology for low power consumption
  • RF transmitter with integrated charge pump at 315/434 MHz
  • Multiple baud rate and modulation scheme
  • Two-channel LF input with detector/decoder
  • Over-temperature shutdown
  • Supply voltage measurement
  • Integrated filter design for media protection in harsh vehicle environments
  • Low-power wake-up timer and periodic reset driver by low frequency oscillations
  • 20-pin SOIC wide body package
  • -40°C to +125°C operating temperature range

MPXY8300 samples are available now to select customers, and general market availability is expected in the second quarter of 2008. Suggested per-unit resale pricing (USD) in 10,000-piece quantities:

  • MPXY8300A for passenger cars with XZ-axis accelerometer at $6.60
  • MPXY8300B for passenger cars with Z-axis accelerometer at $5.48
  • MPXY8300C for passenger cars without an accelerometer at $5.22
  • MPXY8320A for heavy duty trucks with XZ-axis accelerometer at $9.64
  • MPXY8320B for heavy duty trucks with Z-axis accelerometer at $8.00
  • MPXY8320C for heavy duty trucks without an accelerometer at $7.63

More info: Tire Pressure Monitoring System (TPMS) »