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Tire Pressure Monitoring System (TPMS)

A tire pressure monitoring system (TPMS) is an electronic system for monitoring the air pressure inside the tires of an automobile. It consists of multiple radio transmitters with a sensor module installed within tire cavities and a chassis-mounted radio receiver. The use of a TPMS have already been mandated in the U.S., EU and South Korea. Also, TPMS legislation is reviewed in Japan and China for mandating on all automobiles. Therefore, the TPMS market is expected to expand in the near future.

Lately, the TPMS receiver functions are being integrated into a remote keyless entry (RKE) receiver, which is more prevalent in automobiles. As a result, a TPMS receiver must be installed within the limited confines of a vehicle chassis where radio signals can be stably received from any direction, irrespective of vehicle models and body sizes. Today's automobiles have many electronic noise sources due to the increased use of electronic control systems such as those for electric vehicles. Thus, RF ICs with excellent interference performance will be beneficial.

This figure provides an outline of a tire pressure monitoring system (TPMS) and a remote keyless entry (RKE) system.

TPMS System Block Diagram

This is the block diagram of a TPMS system.

Recommended Products

Part Number Functions Availability Frequency(Hz) FSK ASK Package Operating Voltage
315 M to 915 M 230 k/280 k
(built in)
QFN36 2.0 to 5.5 V

Note: This transceiver IC can also be used as a receive-only IC.

Automotive Microcontrollers
Part Number ROM RAM Remarks Package Operating Voltage
  • TLCS-870/C1 core 8-Bit
  • Clock gearing: 1/4, 1/2, 1/1
  • Programmable Motor Driver (PMD2): 1 ch
LQFP 48 4.5 to 5.5 V
  • Arm® Cortex®-M3 CPU core 32-Bit
  • Maximum operating frequency: 40 MHz
  • SLEEP Mode
  • Include 16 KB RAM for backup
LQFP100 4.5 to 5.5 V

Note: Microcontrollers can be used as a receive-only.

System Power Supply ICs
Part Number Functions Output Voltage Output Current Package Operating Voltage
TB9005FNG CPU voltage regulator
(with WDT)
5 V 8 mA SSOP20 6 to 18 V
TB9021FNG CPU voltage regulator
(with WDT)
5 V 200 mA TSSOP16 6 to 18 V

CPU voltage regulator
(with WDT, SPI)

1.5/1.2 V
5 V
5 V
5/3.3 V(Backup)
1000 mA
400 mA
100 mA
10 mA
HQFN52 7 to 20 V
TB9044AFNG** CPU voltage regulator
(with WDT)
5 V
5 V
5 V
5 V
400 mA
100 mA
100 mA
100 mA
HTSSOP48 2.7 to 18 V

**: Under development

* Arm and Cortex are registered trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere.

* System and product names mentioned herein may be trademarks or registered trademarks of respective companies or organizations.


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