Infineon Technologies AG has introduced three enhanced wireless control receivers with the highest sensitivity and low power consumption. The TDA5240, TDA5235 and TDA5225 support multi-band (315MHz, 434MHz, 868MHz and 915MHz) for global coverage, making them ideal for a wide range of automotive applications, including remote keyless entry (RKE) systems, tire pressure monitoring systems (TPMS), remote Start, control, status and alarm functions. In addition, this highly integrated wireless control device benefits industrial and consumer electronic systems such as short-range wireless data transmission equipment, garage door openers, wireless alarm systems, remote meter reading and low-power telemetry equipment. The receiver is also capable of performing certain tasks that are typically performed by the system microcontroller.
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The TDA5240, TDA5235 and TDA5325 are new products after the TDA5230/31 receiver family. Two of these devices feature the powerful digital data processing capabilities of the TDA5230/31 and are fully enhanced in performance and features. Currently, these devices also integrate an IF filter (optional external filter) and level shifter, requiring only a few external components to reduce bill of materials. The innovative integrated low noise amplifier (LNA) concept provides system developers with enhanced product design options. Depending on the application requirements, this low noise amplifier can increase the effective transmission distance of the system or avoid the use of external low noise amplifiers, reducing system complexity and cost.
Matthias Halsband, head of wireless sensing and control at Infineon Automotive Systems, said: "By introducing this new line of wireless control receivers, Infineon has consolidated its leadership position in the RKE receiver market. Features such as highest sensitivity, low power consumption and multi-protocol support reduce system cost while improving performance."
The high sensitivity characteristics of the devices (typical sensitivity of -119dBm and -116dBm for FSK and ASK modulation modes, respectively) are mainly due to the reduced noise figure and noise bandwidth through the use of improved digital signal processing. Compared to Infineon's existing receiver products with an average data rate of 40kchip/s, the TDA5240/35/25 receivers use several embedded encoding and modulation schemes to achieve data rates up to 112kchip/s (FSK).
System designers can use this multi-band, multi-channel receiver to develop systems operating in the 315/434/868/915MHz range, and one crystal frequency is available for all supported bands. The high-resolution singma-delta fraction-N phase-locked loop synthesizer features excellent multichannel resolution of 10.5 Hz.
Multi-protocol processing enables flexible design based on a single platform. The receiver can process data from RKE and TPMS transmitters even if the modulation scheme, bit rate and data format are different. Therefore, for many applications that require two devices today (RKE, TPMS, remote boot, etc.), one device is sufficient.
The wireless control receiver uses a CMOS process and has low power consumption. The current is only 0.8μA in power-down mode and 12mA in normal operation mode. In the case where no data needs to be processed, it is possible to enter the sleep mode at an ultra-fast speed, which can shorten the effective working time of the receiver and further reduce the average power consumption. Up to four independent scan and receive parallel parameter sets for different signal sources can significantly reduce host processor and system standby power consumption.
The TDA5240 and TDA5235 support autonomous receive mode, which automatically extracts the required payload, while interrupts can trigger the host controller to read the payload from the FIFO memory. When an invalid RF signal is received, the host controller is still asleep. This reduces noise from the host controller, further improving flexibility and reducing system power consumption. Support for other encoding methods (biphase, NRZ) and automotive RKE/PASE/TPMS protocols for superior flexibility and minimal software development effort. The TDA5225 does not have digital baseband processing and supports standard concept design products that use microcontrollers to process data.
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