Wireless Control Receivers For Automotive Systems

Rutronik is offering three wireless control receivers from Infineon Technologies that are ideal for automotive applications such as remote keyless entry systems and tyre pressure monitoring systems. The TDA5240, TDA5235 and TDA5225 devices provide multi-band support (315MHz, 434MHz, 868MHz and 915MHz) for worldwide coverage and are also suitable for use in automotive remote-start, control, status and alarm functions. Industrial and consumer systems will also benefit from the highly integrated wireless control devices.

The TDA5240, TDA5235 and TDA5225 are successors to the TDA5230/31 receiver range. Two of the devices include the powerful digital data processing introduced with the TDA5230/31, with overall performance and feature set enhancements. Functionalities such as infrared filter (the optional usage of an external filter is possible) and level shifters are now integrated. Only a few external components are needed, leading to a reduce bill of materials. An integrated low-noise amplifier (LNA) concept provides the system developers with enhanced design alternatives.

Depending on the application needs, this LNA can extend the system range or eliminate the need for an external LNA to reduce system complexity and costs. The high sensitivity of the new range (typically -119dBm for FSK and -116dBm for ASK) is intended to improve digital signal processing. The TDA5240/35/25 devices provide a data rate with several embedded encodings and modulation schemes specified at up to 112kchip/s (FSK). System designers can use the multi-band, multi-channel receivers for systems operating at the 315/434/868/915MHz frequency bands, with one crystal for all supported frequency bands.

A high-resolution sigma-delta fractional-N PLL synthesiser provides a fine multi-channel resolution of 10.5Hz. Multi-protocol handling enables flexible designs based on one platform. The receivers are able to handle data from both RKE and TPMS transmitters, even when they have different modulation, bit rate and data format. Therefore, only one device can be used for multiple applications (RKE, TPMS and remote start, for example) where today there is the need for two.

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