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Remote Keyless Entry (RKE)

A remote keyless entry (RKE) system is designed to lock and unlock vehicle doors remotely. When a driver pushes a button on a key fob, a transmitter in it emits an modulated RF signal. A vehicle's on-board receiver demodulates the RF signal and provides the demodulated data to a microcontroller.

RKE System Block Diagram

This is the block diagram of an RKE system.

Recommended Products

RF-Devices
Part Number Functions Availability Frequency(Hz) FSK ASK Package Operating Voltage
TX RX Local RF IF
TC32306FTG VCO
+PLL
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
TMP89FM82TDUG 32 KB 2 KB
  • 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
(@8MHz)
TMPM358FDTFG 512 KB 80 KB
  • 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
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
TB9041FTG** CPU voltage regulator
DC/DC + LDO
(with WDT)
3.3/1.5/1.2 V
5 V
5 V
200 mA
400 mA
100 mA
QFN36 7 to 18 V
TB9042FTG**

CPU voltage regulator
DC/DC + LDO
(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
TB9043FTG** CPU voltage regulator
DC/DC + LDO
(with WDT)
3.3/1.5/1.2 V
5 V
5 V
1000 mA
400 mA
100 mA
HQFN52 7 to 18 V

**: Under development

* ARM, Cortex and Thumb are the registered trademarks of ARM Limited in the EU and other countries.

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

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