Sensing Solutions—Robust, Reliable Performance
FXTH8715 High Pressure
TPMS Family
Tire Pressure Monitoring Sensors 100-1500 kPa
Target Applications
• Tire pressure monitoring
systems
Overview
Freescale’s FXTH8715 high pressure family of tire pressure monitoring sensors (TPMS) is highly
integrated with the smallest 7 x 7 mm package footprint on the market which has a 63%
smaller footprint than Freescale’s previous-generation of SOIC 20 package developed for truck
applications. It also provides the lowest transmitting power consumption (less than 8 mA Idd),
largest customer memory size (8 kB) currently available and unique dual-axis accelerometer
architecture. Freescale’s TPMS solution integrates an 8-bit microcontroller (MCU), pressure
sensor, XZ-axis or Z-axis accelerometer and RF transmitter.
• Ultra low-power wireless
sensing
Implementations
• Measures pressure typical for
heavy duty vehicles (trucks,
buses, construction vehicles)
• Measures dual-axis acceleration
• Measures temperature
Freescale’s portfolio with pressure ranges of 100-1500 kPa support s medium and heavy duty
trucks, buses and construction vehicles for TPMS markets. These TPMS markets are mainly
driven by improved safety and fleet management requirements.
• Measures battery voltage
• Bi-directional communication
FXTH8715 TPMS Family Block Diagram
Core
System
Memories
Sub-1 GHz Radio Transmitter
315 or 434 MHz ISM band RF Tx
64-byte
Battery-backed
RAM
16 kB Flash
S08 8-bit 4 MHz
Periodic
Wake-Up Unit
512-byte RAM
Debug
Interfaces
Interrupt
Controller
26 MHz
VCO / PLL
Oscillator
Temperature
Restart
Packet Encoder
32-byte Buffer
Analog
Timers
Interfaces
Clocks
Low-, Medium- and
High- Frequency
Oscillators
Keyboard Interface
6 ch GPIOs
2 ch Timer
6 ch 10-bit ADC
Periodic
Interrupt
Timer
Sensor Measurement
Interface
Internal
Reference Clocks
125 kHz Differential
LF ASK Rx
Pressure Sensor
Accelerometer
Low-Power
Timer
Temperature Sensor