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.
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
Xtrinsic FXTH87
TPMS Family Block Diagram
Core
S08 8-bit 4 MHz
System
64-byte
Battery-backed
RAM
Periodic
Wake-Up Unit
Temperature
Restart
Packet Encoder
32-byte Buffer
Memories
16 kB Flash
Sub-1 GHz Radio Transmitter
315 or 434 MHz ISM band RF Tx
Debug
Interfaces
Interrupt
Controller
512-byte RAM
26 MHz
Oscillator
VCO / PLL
Analog
6 ch 10-bit ADC
Timers
2 ch Timer
Periodic
Interrupt
Timer
Low-Power
Timer
Interfaces
Keyboard Interface
6 ch GPIOs
Clocks
Low-, Medium- and
High- Frequency
Oscillators
Internal
Reference Clocks
Sensor Measurement
Interface
Pressure Sensor
Accelerometer
Temperature Sensor
125 kHz Differential
LF ASK Rx
Product Specifications
Standard
Part Number
P-cell
Pressure Offset
Axis of
Range (kPa) Accuracy (0° C to 70° C) Acceleration
Z Range
Z-Offset Accuracy
(-40° C to +125° C) X Range
X-Offset Accuracy
(-40° C to +125° C)
Standard Tolerances
FXTH870502DT1
FXTH870511DT1
FXTH870902DT1
FXTH870911DT1
FXTH870912DT1
100–450
100–450
100–900
100–900
100–900
±7 kPa
±7 kPa
± 10 kPa
± 10 kPa
± 10 kPa
Z
XZ
Z
XZ
XZ
-270 g/+ 400 g range
-210 g/+240 g range
-270 g/+ 400 g range
-210 g/+240 g range
-270 g/+ 400 g range
±6 g
±5 g
±6 g
±5 g
±6 g
-80 g/+90 g range
-80 g/+90 g range
±4 g
±4 g
-80 g/+90 g range
±4 g
Precision Tolerances
FXTH8705026T1
FXTH8705116T1
FXTH8709026T1
FXTH8709116T1
FXTH8709126T1
100–450
100–450
100–900
100–900
100–900
± 7 kPa
±7 kPa
± 10 kPa
± 10 kPa
± 10 kPa
Z
XZ
Z
XZ
XZ
-270 g/+ 400 g range
-210 g/+240 g range
-270 g/+ 400 g range
-210 g/+240 g range
-270 g/+ 400 g range
±3 g
±3 g
±3 g
±3 g
±3 g
-80 g/+90 g range
-80 g/+90 g range
±3 g
±3 g
-80 g/+90 g range
±3 g
* For precision product availability, please contact your Freescale Sales Representative.
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)
Common Attributes
Voltage Measurement Range
Voltage Resolution (8-bit)
Voltage Accuracy (>2.1 V supply)
Temperature Measurement Range Run Mode
Temperature Resolution (8-bit unsigned)
Temperature Offset Accuracy (-20
o
C ≤ TA ≤ 70
o
C)
1.8 V to 3.6 V
10 mV / LSB
±100 mV
-40
o
C to +125
o
C
1
o
C / LSB
±3
o
C
Product Differentiation
Features
Smallest, fully integrated package size
Dual-axis XZ inertial sensor
Same package height and similar firmware as QFN 9 x 9 solutions
8 kB customer memory/capability of interfacing with
external memory
Lowest RF power consumption
High production capacity (QFN 7 x 7)
Benefits
Enables smallest module design for lighter
weight and space-constrained applications
Enables easier tire localization capability
Easy transition from QFN 9 x 9 solutions
Flexibility of software development and
time to market
Longest battery life
Secured supply and short lead time
Documentation
Document Number
FXTH870xD
FXTH870x6
AN4391
AN1902
Title
Tire Pressure Monitor System Standard Tolerance Specification
Tire Pressure Monitor System Precision Tolerance Specification
Using the FXTH87 Family of LF Receivers for TPMS Application
Assembly Guidelines for QFN and DFN Packages
Description
Data Sheet
Data Sheet
Application Note
Application Note
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
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.
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
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