MLX73290-A 300 to 930MHz Transceiver with Integrated 3D LF receiver

Highly Integrated RF IC from Melexis Encourages Proliferation of Passive Entry & Low-Power Tracking Systems

The newly released MLX73290-A from Melexis is a multi-channel, programmable Radio Frequency transceiver for long range, high speed communication and a 3 dimensional low frequency interface (3DLF) for low power wake-up. Through its integration of sub-GHz RF and low-frequency technologies, this RF IC is highly optimized for use in vehicle activation, logistics and various Internet of Things (IoT) applications. These include passive keyless entry & start (PKES), secure access and low-power tracking systems, where a very-low power wake-up function together with long range, high speed RF feedback are mandated.

The 3DLF interface features an automatic and fully programmable scan mode, constantly polling for a valid low frequency (LF) signal on the 3 differential receive coil inputs. This permits a typical 4uA power consumption in LF detection mode. The LF-RSSI feature allows precise monitoring of the received LF field. Working in combination with the system’s host microcontroller, it can run in passive transponder mode and thereby support battery-less operation.

Optimized for use in the sub-GHz ISM bands, covering 300MHz to 960MHz, the highly integrated RF IC delivers a transmitter output of -20dBm to +13dBm. It has a receiver sensitivity down to -120dBm in a 15kHz channel bandwidth. A 250kbps maximum data rate is supported. Modulation schemes that can be used are on-off keying (OOK), binary frequency shift keying (FSK), minimum shift keying (MSK), Gaussian minimum shift keying (GMSK) and Gaussian frequency shift keying (GFSK).

Engineers can program the MLX73290-A through its serial peripheral interface (SPI), with a multitude of different parameters being adjustable – RF output power, RF bandwidth, modulation type, LF polling mode, LF/RF packet handlers, etc. Specific application requirements can thus be addressed, without any need for compromise. Evaluation boards and software tools are available to accompany this IC, making it easier to deploy.

When combined with the MLX74190 high power initiator device, the MLX73290-M sub-GHz ISM transceiver and an MLX81109 LIN slave interface, the MLX73290-A becomes part of a highly effective passive start solution for 2-wheelers (such as motorcycles, scooters, etc.), all-terrain vehicles and secure door entry systems.

Melexis’ MLX73290-A devices are supplied in 5mm x 5mm 32-lead QFN packages, covering an operational temperature range from -40°C to 105°C.

Features

On-chip combination of 3DLF & RF technologies
3DLF interface for low power wake-up (battery-less mode possible)
Multi-band (300 to 960MHz) RF transceiver for long range, high speed communication
RSSI information for both LF and RF interfaces
Supply voltage range of 2.1 to 3.6V
32L QFN5x5 package

Applications