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Infineon Technologies has introduced three wireless control receivers for use in automotive applications such as remote keyless entry (RKE) systems and tyre pressure monitoring systems (TPMSs).

The TDA5240, TDA5235 and TDA5225 devices provide multi-band support (315MHz, 434MHz, 868MHz and 915MHz) for worldwide coverage, offer high sensitivity and low power consumption and are also ideal for use in remote-start, control, status and alarm functions.

In addition, industrial and consumer systems such as short-range radio data transmission, garage-door openers, cordless alarm systems, remote metering and low-power telemetry will benefit from the highly integrated wireless control devices.

The receivers are capable of taking over some of the tasks that are typically performed by the system’s microcontroller.

The TDA5240, the TDA5235 and the TDA5325 are successors to the TDA5230/31 receiver range.

Two of the devices include the digital data processing introduced with the TDA5230/31, with overall performance and feature set enhancements.

Functionalities such as an infrared (IF) 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 reduced bill of materials (BOM).

An integrated low-noise amplifier (LNA) concept provides system developers with enhanced design alternatives.

Depending on 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 a result of a reduced noise figure and noise bandwidth using improved digital signal processing.

Compared with Infineon’s current receiver products, which offer an average data rate of 40kchip/sec, the TDA5240/35/25 devices provide a data rate with several embedded encodings and modulation schemes specified at up to 112kchip/sec (FSK).

System designers can use the multi-band, multi-channel receivers for systems operating at frequency bands of 315/434/868/915MHz, 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 rates and data formats.

Therefore, only one device can be used for multiple applications (RKE, TPMS, remote start and so on) where today there is the need for two.

The wireless control receivers are based on a CMOS process providing low power consumption.

The supply current is only 0.8uA in power-down mode and 12mA in run mode.

An ultra-fast fall-back-to-sleep function reduces the receiver’s active time when no data is available for a further reduction of the average power consumption.

Up to four parallel parameter sets for autonomous scanning and reception from different sources reduce the host processor and system standby power consumption.

The TDA5240 and the TDA5235 support an autonomous receive mode where the desired payload is automatically extracted and interrupts can trigger the host controller to read payload from the FIFO memory.

The host controller remains asleep when unwanted radio-frequency signals are received.

This decreases noise from the host controller, which further improves sensitivity and reduces power consumption.

Support for additional encodings (bi-phase, NRZ) and the coverage of automotive RKE/PASE/TPMS protocols result in high flexibility while minimising the software development effort, according to the company.

The TDA5225 comes without digital baseband processing to support designs based on standard concepts with data processed in the microcontroller.

The product range members differentiate mainly in the multi-channel and digital baseband functionality.

The new pin-compatible TDA5240/35/25 wireless control receivers in TSSOP-28 packages are available in volume production.

The automotive-qualified devices operate at a supply voltage of 3.3V or 5.0V and at a temperature range of -40C to +105C.

Pricing for the TDA5225 starts at EUR0.80 (GBP0.52) each in 50,000-unit quantities.

In addition, Infineon provides starter kits and tools to support the design-in of the new devices.

Infineon Technologies

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