Target Applications
• Tire pressure monitoring
systems
• Ultra low-power wireless
sensing
Implementations
• Measures pressure for
passenger/light duty vehicles
• Measures dual-axis
acceleration
• Measures temperature
• Measures battery voltage
• Bi-directional communication
FXTH870x TPMS Family Block Diagram
Sensing Solutions—Robust, Reliable Performance
FXTH870x TPMS Family
Tire Pressure Monitoring Sensors 100-900 kPa
Overview
Freescale’s FXTH870s family of tire pressure monitoring sensors (TPMS) is the smallest, fully
integrated 7 x 7 mm package footprint on the market which is 40% smaller than Freescale’s
previous-generation QFN 9 x 9 mm package. It also provides the lowest transmitting power
consumption (less than 8 mA Idd), largest customer memory size (8 kB) 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.
Freescale’s portfolio with pressure ranges of 100-450 kPa and 100–900 kPa support cars
and light trucks TPMS markets. These TPMS markets are mainly regulation driven with new
mandates, resulting in significant growth. Freescale continues to produce TPMS products
that meet the latest mandates with ease to accommodate customer requirements.
Xtrinsic FXTH87 TPMS Family Block Diagram
Timers
System Memories
Interfaces Clocks
Low-, Medium- and
High- Frequency
Oscillators
Internal
Reference Clocks
Analog
Debug
Interfaces
S08 8-bit 4 MHz
Sub-1 GHz Radio Transmitter
Packet Encoder
26 MHz
Oscillator VCO / PLL
32-byte Buffer
315 or 434 MHz ISM band RF Tx
Periodic
Interrupt
Timer
2 ch Timer
125 kHz Differential
LF ASK Rx
6 ch GPIOs
Keyboard Interface
64-byte
Battery-backed
RAM
Periodic
Wake-Up Unit
Low-Power
Timer
512-byte RAM
16 kB Flash
Sensor Measurement
Interface
6 ch 10-bit ADC
Interrupt
Controller
Core
Temperature
Restart
Accelerometer
Pressure Sensor
Temperature Sensor
For more information, visit freescale.com/TPMS
Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off.
All other product or service names are the property of their respective owners.© 2015 Freescale Semiconductor, Inc.
Document Number: FXTH87A4FS REV 3
Common Attributes
Voltage Measurement Range 1.8 V to 3.6 V
Voltage Resolution (8-bit) 10 mV / LSB
Voltage Accuracy (>2.1 V supply) ±100 mV
Temperature Measurement Range Run Mode -40 oC to +125 oC
Temperature Resolution (8-bit unsigned) 1 oC / LSB
Temperature Offset Accuracy (-20 oC ≤ TA ≤ 70 oC) ±3 oC
Product Differentiation
Features Benefits
Smallest, fully integrated package size Enables smallest module design for lighter
weight and space-constrained applications
Dual-axis XZ inertial sensor Enables easier tire localization capability
Same package height and similar firmware as QFN 9 x 9 solutions Easy transition from QFN 9 x 9 solutions
8 kB customer memory/capability of interfacing with
external memory
Flexibility of software development and
time to market
Lowest RF power consumption Longest battery life
High production capacity (QFN 7 x 7) Secured supply and short lead time
Product Specifications
Freescale: A Leader in Sensing Solutions
Expanding on more than 35 years of sensor innovation, Freescale sensing solutions are
designed with the right combination of high-performance sensing capability, processing
capacity and customizable software to help deliver smart, differentiated sensing applications.
With these sensing solutions, our vision is to offer a diverse and differentiated product portfolio
to meet the expanding needs of the automotive, consumer and industrial segments. Freescale
sensing solutions offer ideal blends of functionality and intelligence designed to help our
customers differentiate and win in highly competitive market.
Product Longevity Program
These products are/or may be supported
by Freescale’s Product Longevity Program.
For Terms and Conditions and to obtain
a list of available products please see:
Freescale.com/productlongevity
Standard
Part Number
P-cell
Range (kPa)
Pressure Offset
Accuracy (0° C to 70° C)
Axis of
Acceleration Z Range
Z-Offset Accuracy
(-40° C to +125° C) X Range
X-Offset Accuracy
(-40° C to +125° C)
Standard Tolerances
FXTH870502DT1 100–450 ±7 kPa Z-270 g/+ 400 g range ±6 g
FXTH870511DT1 100–450 ±7 kPa XZ -210 g/+240 g range ±5 g -80 g/+90 g range ±4 g
FXTH870902DT1 100–900 ± 10 kPa Z-270 g/+ 400 g range ±6 g
FXTH870911DT1 100–900 ± 10 kPa XZ -210 g/+240 g range ±5 g -80 g/+90 g range ±4 g
FXTH870912DT1 100–900 ± 10 kPa XZ -270 g/+ 400 g range ±6 g -80 g/+90 g range ±4 g
Precision Tolerances
FXTH8705026T1 100–450 ± 7 kPa Z-270 g/+ 400 g range ±3 g
FXTH8705116T1 100–450 ±7 kPa XZ -210 g/+240 g range ±3 g -80 g/+90 g range ±3 g
FXTH8709026T1 100–900 ± 10 kPa Z-270 g/+ 400 g range ±3 g
FXTH8709116T1 100–900 ± 10 kPa XZ -210 g/+240 g range ±3 g -80 g/+90 g range ±3 g
FXTH8709126T1 100–900 ± 10 kPa XZ -270 g/+ 400 g range ±3 g -80 g/+90 g range ±3 g
Features
• QFN 7 x 7 x 2.2 mm package enables
visible solder joint for inspection
• 100–450 kPa and 100–900 kPa
pressure ranges
• Z-axis or dual XZ-axis accelerometers
• Accelerometer standard or precision
tolerances available
• Low-power wake-up timer and periodic
reset driven by LFO
• Dedicated state machines for reduced
power consumption
• 8-bit MCU/S08 core with SIM, interrupt
and debug/monitor
• 512 Bytes RAM / 16 k Flash (8 k for
Freescale library, 8 k for applications)
• Internal 315/434 MHz RF transmitter
• Internal 125 kHz LF receiver
• Six multipurpose GPIO pins (including
two A/D inputs)
Documentation
Document Number Title Description
FXTH870xD Tire Pressure Monitor System Standard Tolerance Specification Data Sheet
FXTH870x6 Tire Pressure Monitor System Precision Tolerance Specification Data Sheet
AN4391 Using the FXTH87 Family of LF Receivers for TPMS Application Application Note
AN1902 Assembly Guidelines for QFN and DFN Packages Application Note
* For precision product availability, please contact your Freescale Sales Representative.
