Highly Integrated RF IC From Melexis Encourages Proliferation Of Passive Entry & Low-Power Tracking Systems

Multi-channel, programmable device incorporates ultra-low power 3DLF receiver & RF sub-GHz transceiver

Melexis, a global microelectronics engineering company, has added to its portfolio of low power wireless solutions with the introduction of the MLX73290-A. This innovative new device features a sophisticated multi-channel RF transceiver, combined with a 3-dimensional low frequency (3DLF) interface that supports ultra-low power operation. 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. For more information, visit http://www.melexis.com/MLX73290-A 

About Melexis

Melexis designs, develops, tests and markets advanced integrated semiconductor products. Our devices meet the world’s growing demand for greener and safer cars that are fun to drive, smarter appliances and more conscious buildings. We supply unique sensor and driver chips, communicating with analog, digital, wired or wireless interfaces, enhanced with advanced on board microcontrollers or DSP capabilities. Our core experience is derived from over 25 years supplying leading-edge and innovative ICs to the automotive electronics market, expanding in other application fields such as smart appliances and building automation. Melexis is proud to partner with our customers to engineer the sustainable future.

Melexis’ portfolio is built around three pillars: Sensing, Driving and Communicating. Sensors include magnetic, MEMs, and sensor interface ICs; optoelectronic single point and linear array sensors; infrared thermometers, CMOS wide dynamic range, Time of Flight and night vision cameras. Driver ICs cover Advanced DC & BLDC motor controllers and FET Pre-driver ICs. Communication ICs serve RKE, TPMS, ISM band applications, NFC, RFID reader and smart tag solutions.