Weartech-ICs & Semiconductors Archives - Page 28 of 41

Wireless charging transmitter coil driver is in QFN3x3 package

Fri, Oct 01, 2021

The first in a family of coil drivers from Alpha and Omega Semiconductor (AOS) that are supplied in a thermally enhanced QFN3x3 package are suitable for wireless charging transmitter circuits in a variety of space constrained applications.

The AOZ32033AQI is an integrated half-bridge gate driver capable of driving high-side and low-side N-channel MOSFETs. The coil driver offers 30V, 11 mOhm in a QFN3x3 package. It features slew rate control (SRC) to adjust sink / source current and provide a trade-off between efficiency and EMI optimisation in the design of wireless charging transmitter (TX) circuits, explains AOS.

The coil driver is intended for use in wireless charging TX circuits used in cordless power tools, vacuum cleaners, drones, and other consumers’ electronic equipment which use full-bridge topology with a resonant tank circuit for power conversion efficiency.

The integrated package offers a part count reduction of up to 40 per cent compared to traditional approaches, says AOS. The AOZ32033AQI enables PCB space savings and higher performance in wireless transmitter circuits with high wattage of up to 30W. To ensure the design is robust, the coil driver has multiple protection functions such as high side and low side under-voltage lockout and over-temperature protection. The coil driver can be used for a wide range of input voltages from 4.0 to 28V.

“Wireless charging is offered at increasingly higher power levels as the benefits of eliminating physical connectors and cables are being realised by more end applications,” says said Colin Huang, power IC marketing manager at AOS. This, the first member announced of the company’s coil driver product family, will provide an efficient, power-dense, and cost-effective solution for wireless charging TX circuits, he continues. “The integrated approach offers protection features not possible by using a discrete approach while reducing engineering design cycles and complexities,” he says.

The AOZ32033AQI is immediately available in production quantities with a lead-time of 12 weeks.

Alpha and Omega Semiconductor (AOS) is a designer, developer, and global supplier of a broad range of power semiconductors, including a wide portfolio of power MOSFET, IGBT, IPM, TVS, HVIC, SiC/GaN, power IC, and digital power products. AOS has developed extensive IP and technical knowledge to introduce innovative products to address the increasingly complex power requirements of advanced electronics.

AOS’s portfolio of products targets high-volume applications, including portable computers, flat-panel TVs, LED lighting, smartphones, battery packs, consumer and industrial motor controls, automotive electronics, and power supplies for TVs, computers, servers, and telecommunications equipment.

http://www.aosmd.com

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MEMS timing accelerates wireless charging says SiTime

Thu, Sep 30, 2021

For power-sensitive and space-constrained mobile and IoT applications, the SiT3901 uPower digitally controlled MEMS oscillator (DCXO) has been introduced by SiTime. It improves wireless charging speed by up to 25 per cent while reducing the overall timing solution area by up to 90 per cent, says the company. The MEMS oscillator is suitable for wireless charging systems for smart watches, activity trackers, hearing aids, and wearables.

“The power and size requirements of new wireless applications demand a new approach to timing,” says Piyush Sevalia, executive vice president of marketing at SiTime. “The SiT3901 DCXO is the industry’s first µPower digitally controlled oscillator, and it delivers by improving charging efficiency and reducing the area,” he adds.

Wireless charging standards such as Qi and AirFuel rely on resonant power transfer to enable proximity charging. However, environmental interference may dynamically impact the resonant charging frequency, which slows down the charging process. The SiT3901 enables the charger to dynamically tune the resonant frequency, maximising power transfer and delivering up to 25 per cent faster charging. The digital control feature on the SiT3901 DCXO eliminates the need for additional passive components on the board, reducing the timing solution area by up to 90 per cent. The resulting charging system works better and is smaller, more manufacturable, and more reliable, claims SiTime.

The SiT3901 DCXO extends SiTime’s µPower MEMS oscillator family targeting power and space-constrained wearable, hearable, IoT, and mobile applications. The µPower MEMS oscillators consume up to 90 per cent less power and up to 90 per cent less space compared to quartz oscillators, enabling environmentally friendly electronics. The SiT3901 offers high resilience to analogue noise and includes low 105 microA current consumption (typical), a wide digital pull range (up to 15 per cent) for output frequency and a programmable frequency of 1.0 to 26MHz. They are stable over temperature of ±50 and ±100 ppm and have a wide operating temperature range of -40 to +85 degrees C.

The oscillators are supplied in a small 1.5 x 0.8mm package size.

http://www.sitime.com

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Cryptographic controller protects with lowest power budget, claims Analog Devices

Thu, Sep 16, 2021

Claimed to provide 30 times lower power and industrial-grade protection for battery-powered devices, the MAXQ1065 has been released by Analog Devices.

The low power cryptographic controller features ChipDNA PUF (physically unclonable functionality) technology, which is claimed to offer the strongest protection for edge to cloud IoT nodes, including medical and wearable devices, against invasive security attacks. The security co-processor provides 30 times lower power when compared to similar products, claimed ADI and its extended lifetime and operating range make it suitable for long-term deployments in harsh environments.

The MAXQ1065 security co-processor provides turnkey cryptographic functions for root of trust, mutual authentication, data confidentiality and integrity, secure boot, secure firmware update, and secure communications. It includes standard algorithms for key exchange and bulk encryption, or complete transport layer security (TLS) support. The device integrates 8kbyte of secure storage for user data, keys, certificates and counters with user-defined access control and life cycle management functionality for IoT equipment.

The MAXQ1065’s small footprint and low pin count allow for easy integration into medical and wearable devices. The MAXQ1065 life cycle management allows flexible access control rules during the major life cycle stages of the device and end equipment, enabling it to be used for long-term operation in harsh environments. In addition to the proprietary PUF technology to resist attacks, the MAXQ1065 is also supported by Analog Devices’ secure key pre-programming service for customers who want keys, data and life cycle state initialised prior to shipment to a contract manufacturer.

Analog Devices has a comprehensive suite of analogue and mixed signal, power management, radio frequency (RF), and digital and sensor technologies. ADI serves 125,000 customers worldwide operating in the industrial, communications, automotive, and consumer markets.

https://www.analog.com

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Secure embedded controllers integrate AI/ML acceleration

Thu, Sep 02, 2021

Built to power the next generation, always-connected IoT products, Alif Semiconductor’s Ensemble and Crescendo families are power-efficient devices which integrate AI/ML acceleration, multi-layered security, LTE Cat-M1 and NB-IoT connectivity, GNSS positioning, and memory.

The Ensemble family scales from single Arm Cortex®-M55 microcontrollers to so-called fusion processors which blend up to two Cortex-M55 cores, up to two Cortex-A32 microprocessor cores capable of running high-level operating systems, and up to two Arm Ethos-U55 microNPUs for artificial intelligence (AI) and machine learning (ML) acceleration.

The Ensemble family devices contain an advanced secure enclave that provides device integrity protection, secure identity, strong root-of-trust and secure lifecycle management. They also have large on-chip SRAM and non-volatile memory, accelerated graphics, imaging, making them suitable for smart home automation, appliances, point of sale (PoS) terminals and robotics applications, said the company.

The Crescendo family offers the same functionality as the Ensemble family, with the addition of LTE Cat-M1 and NB-IoT cellular connectivity, optional iSIM for simplified subscriber management, integrated RF, power amplifiers, and a concurrent GNSS receiver. These capabilities make them well-suited for smart city, connected infrastructure, asset tracking, healthcare devices and wearable devices said the company, using a single chip to minimise size and weight.

To address the reliance on battery power in IoT devices, which can be challenging when there is a high requirement for local processing, AI/ML, and wireless communication, Alif Semiconductor has also introduced Autonomous Intelligent Power Management (aiPM) technology that allows fine-grained control of when resources in the chip are being powered. This results in low power operation, enabling intelligent devices to last longer on smaller batteries.

“The solution that Alif delivers fills a significant gap in the market,” said Jerome Schang, head of Microsoft Azure Edge Silicon devices strategy. “We are always on the lookout for the most efficient technology platforms for our Edge experiences, and the Ensemble and Crescendo families are very well aligned with our customers’ needs.”

Ensemble and Crescendo devices are sampling now to lead customers. They are supported by Alif Semiconductor’s software, development tools and kits. Production qualification will be complete in 1Q22.

https://www.alifsemi.com/

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Wireless charging transmitter coil driver is in QFN3x3 package

MEMS timing accelerates wireless charging says SiTime

Cryptographic controller protects with lowest power budget, claims Analog Devices

Secure embedded controllers integrate AI/ML acceleration

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