Class-D amplifier adds diagnostics for audible safety alerts

The HFDA801A is a high-resolution audio amplifier that STMicroelectronics specifically designed for compact, cost-effective automotive applications.

The 2MHz switching pulse-width modulation (PWM) Class-D amplifier with a quad-bridge configuration integrates a DAC to ensure hi-fi quality sound under any load condition, with noiseless turn-on/turn-off and without creating any output artefacts. The signal-to-noise ratio is 121dB, with 120dB dynamic range and only 10μV output noise, for a high audio performance from an inexpensive small form factor component, said STMicroelectronics.

The feedback configuration with integrated L-C low-pass filter provides a wide flat frequency response up to 80kHz and minimises dependence on external components to reduce the bill of materials. The wide bandwidth allows use in high-definition (HD) audio applications, letting designers rely on excellent linearity and low distortion that are independent of the inductor and capacitor quality, the company added.

The architecture derives all required voltages internally, enabling the HFDA801A to draw its supply from the vehicle battery without the need for additional power converters. The amplifier’s load capabilities ensure stable performance even while driving high power on low impedance loads of 2Ohm on all four channels.

The integration of in-play diagnostics as well as a digital impedance meter and real-time load-current monitor, allow the HFDA801A to be used in safety-related audio applications that must demonstrate ASIL compliance, such as acoustic vehicle alerting systems (AVAS).

The HFDA801A is sampling now and will be in production in the second half of 2021. Please contact your ST sales office for pricing options and sample requests.

http://www.st.com

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Infineon adds Wi-Fi 6/6E and Bluetooth 5.2 SoC for IoT and streaming

Infineon Technology claims that its latest AIROC devices are the industry’s first 1×1 Wi-Fi 6/6E and Bluetooth 5.2 combo SoC for the IoT, enterprise and industrial applications, and the first 2×2 Wi-Fi 6/6E and Bluetooth 5.2 combo SoC for multimedia, consumer and automotive applications.

The Wi-Fi 6/6E devices operate in the 2.4, 5.0 and the new, greenfield 6.0GHz spectrum for minimal latency. Intended uses are for high quality video and audio streaming applications like gaming consoles, augment reality/virtual reality (AR/VR), smart speakers, media-streaming devices and automotive infotainment as well as applications that require an instant response, such as security systems and industrial automation.

The Bluetooth 5.2 technology enables high quality audio with LC3 and enable new Bluetooth Low Energy audio use cases such as audio sharing and audio broadcast. The low power wake-on-Bluetooth Low Energy mode allows the host CPU to conserve power while the Bluetooth core autonomously ‘listens’ for incoming connection requests.  Infineon’s unique Smart Coex maximises Wi-Fi throughput when used concurrently with Bluetooth, and optimises the device for multimedia use cases.

The AIROC Wi-Fi 6/6E-certified devices double the wireless coverage range, compared with Wi-Fi 5 and Wi-Fi 4 and deliver 40 per cent more coverage than typical Wi-Fi 6/6E solutions, says Infineon. The robust connection enhances interference mitigation while the low latency and co-existence of Wi-Fi and Bluetooth improve multimedia streaming and gaming responsiveness in overlapping network environments, reports Infineon.

Multi-layer security protections with secured boot, firmware authentication and encryption, and lifecycle management, introduce a higher level of security for IoT applications.

The AIROC Wi-Fi 6 / 6E and Bluetooth 5.2 combo is currently sampling to select customers.

It will be on display at Infineon’s virtual Embedded Solutions Conference 2021 (1 – 5 March): www.infineon.com/embeddedworld

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SiPM array is qualified for automotive lidar use

Lidar capabilities have been added to ON Semiconductor’s intelligent sensing portfolio, with the addition of the RDM-series silicon photo-multiplier (SiPM) array. The ArrayRDM-0112A20-QFN is the first automotive-qualified SiPM product in the market, claims ON Semiconductor.

The monolithic (1 X 12) array of SiPM pixels, enables high sensitivity to near-infra red (NIR) light to achieve 18.5 per cent photon detection efficiency (PDE) at 905nm. The high internal gain of the SiPM allows sensitivity down to the single photon level, which, combined with the high PDE, detects the faintest return signals for a longer distance range, even with low reflective targets, says ON Semiconductor.

SiPM technology has become the sensor of choice for depth sensing applications. They can deliver the highest signal-to-noise performance for long distance ranging in bright sunlight conditions. They also have low supply biases and low sensitivity to temperature changes, making them suitable upgrades for systems that use legacy avalanche photodiodes (APDs). The high volume CMOS process production contributes to the low detector cost, adds ON Semiconductor.

Lidar is used in vehicles to improve safety and advanced driver assistance systems (ADAS), as well as for fully autonomous driving use cases, such as robotic transportation, to safely navigate the environment in real time.

The ArrayRDM-0112A20-QFN’s high PDE allows lidar systems supporting these functions demonstrated a distance range of over 300 meters. The greater distance gives vehicles more time to respond.

The ArrayRDM-0112A20-QFN is AEC-Q102 qualified and developed in accordance with IATF 16949.

ON Semiconductor supplies semiconductor-based solutions, offering a comprehensive portfolio of energy efficient, power management, analogue, sensors, logic, timing, connectivity, discrete, SoC and custom devices. The company’s products are used by engineers in automotive, communications, computing, consumer, industrial, medical, aerospace and defence applications.

ON Semiconductor operates a responsive supply chain and quality program, a robust compliance and ethics program, and a network of manufacturing facilities, sales offices and design centres in key markets throughout North America, Europe and the Asia Pacific regions.

http://www.onsemi.com

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Application processors bring security to the edge with NPUs

NXP has introduced the i.MX 9 applications processors, which integrate dedicated neural processing units (NPUs) to accelerate machine learning (ML).

The i.MX 9 series is NXP’s first implementation of the Arm Ethos U-65 microNPU, which makes it possible to build low cost, highly efficient AI in embedded devices. They also implement NXP’s Energy Flex architecture which can be used by developers to optimise energy efficiency and reduce carbon footprint while extending battery life, says the company.

The i.MX 9 series is intended to expand machine learning capabilities at the edge for performance-intensive systems which require low power connectivity and machine learning acceleration options. Typical uses will be factory and process automation, transportation, robotics and industry 4.0, together with machine learning with time sensitive networking (TSN) technology, they will enhance performance graphics, vision and enable emerging technologies.

Specific i.MX 9 applications processors will also enable advanced machine learning, including multi object, multi-face recognition with inference in milliseconds and voice based system which will recognise natural language and accents. There will also be sequence analysis for gesture recognition and processors will be able to detect anomalies in industrial systems for predictive maintenance and in synthetic sensors for smart homes and other IoT applications.

The first families in this series will be built in 16/12nm FinFET process technology with specific low power optimisation. The i.MX 9’s Energy Flex architecture combines heterogeneous domain processing (independent applications processor and real-time domains with a separate low power, multimedia domain), design techniques, and process technology to maximise performance efficiency, explains NXP.

For example, low power audio use cases can be powered by the real time domain, where audio can run when the rest of the processor is switched off. The real time domain is also suited to industrial applications such as the CAN network which requires a fast boot (less than 100 milliseconds).

Also included in the i.MX 9 processors is the EdgeLock secure enclave. This is a self-managed, autonomous on-die security IP in the SoC architecture. It simplifies the implementation of complex security with autonomous management of security functions, including silicon root of trust, run-time attestation, trust provisioning and SoC secure boot enforcement. There are also crypto services for advanced attack resistance and to simplifying security certifications. The EdgeLock secure enclave intelligently tracks power transitions when end-user applications are running on the device to help prevent new attack surfaces from emerging.

For edge to the cloud security, specific members of the i.MX 9 series will be Microsoft Azure Sphere-certified.

The i.MX9 application processors will find applications in smart homes, smart cities and public safety systems, fleet management, farming and agriculture, consumer audio, healthcare and energy applications where low power connectivity and machine learning acceleration options are necessary.

http://www.nxp.com

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