Able to extend battery life in portable devices by virtue of what is claimed to be the industry’s highest light-load power conversion efficiency at 90%, the ADP5301 buck regulator consumes just 180nA quiescent current.
It is, says Analog Devices, designed to deliver maximum power for a longer period of time than previously achievable and is suited for IoTapplications, including wireless sensor networks and wearable devices such as fitness bands and smartwatches.
It is housed in a tiny WLCSP package that measures less than 3.1mm².
The input voltage is from 6.5 to 2.05V to enable a range of battery sources or architectures. Selectable, low-noise forced PWM mode, with low output voltage ripple powers noise-sensitive analogue load up to 500mA output current.
The ADP5301 and ADP5303 (with VOUT OK and VIN OK flags, respectively) are offered in a nine-ball WLCSP, and the ADP5300 and ADP5302 (VOUT OK and VIN OK flags, respectively) are available in a 10-lead LFCSP.
Sector News
World’s smallest quartz frequency devices drive IoT and wearable design
Three offerings from AEL Crystals reduce the size of the core technology for wearable and IOT devices, says the company.
They are the 1610 watch crystal; the 1210 crystal; and the 1612 oscillator.
The 1610 watch crystal is the world’s smallest 32.768kHz watch crystal, claims the company. It measures 1.6 x 1.0 x 0.5mm (maximum). The wide operating temperature ranges from -40 to +105°C. Initial stabilities can be specified between ±10 and ±50ppm, for wireless modules, in-car devices, Bluetooth devices and mobile phones, as well as wearable devices, such as smart watches, fitness trackers, medical and activity monitoring devices.
ESR (Equivalent Series Resistance) is 60k? (maximum), making the watch crystal suitable for low ESR applications such as Bluetooth Low Energy chipsets. Furthermore, AEC-Q200 compliant versions are available, for use in the automotive industry.
The 1210 crystal is claimed to be the world’s smallest crystal and measures just 1.2 x 1.0 x 0.33mm (maximum). It can be supplied between 36.0 and 80.0MHz. Operating temperature can be specified from -40 to +125°C, with temperature stability from ±10 to ±50ppm and initial stability as low as ±7ppm. AEC-Q200 compliant versions are also available.
According to the company, the world’s smallest oscillator is the 1612. It measures just 1.6 x 1.2 x 0.7mm (maximum) and operates across a temperature range from -40 to +85°C. Temperature stability is ±10 to ±50ppm, and initial stability of ±7 to ±50ppm. Operating frequency range is 1.0 to 80.0MHz and the oscillators operates from a 1.8, 2.5 or 3.3V supply.
http://www.aelcrystals.co.uk
Self-powered serial EEPROM targets IoT and battery markets
A single-wire EEPROM with only two-pins (data pin and ground pin) are aimed at IoT, wearables, consumable, battery and cable identification markets. The AT21CS01 from Atmel is self-powered, eliminating the need for a power source or Vcc pin, with a parasitic power scheme over the data pin. They are claimed to provide best-in-class, low power standby of 700nA, 200µA for write current and 80µA for read current at 25°C.
The device’s parasitic power scheme over a single data pin eliminates the need for external capacitors and rectifiers, says the company. The high write endurance capability allows more than one million cycles for each memory location to meet the requirements for today’s high-write endurance applications.
A plug-and-play 64bit unique serial number in every device, makes it suitable for connected devices including smart fitness bands and healthcare devices. ESD is described as industry leading (IEC 61000-4-2 Level 4 ESD compliant), making it suitable for applications such as cables required to tolerate exposure to the outside environment or direct human contact.
Using a single pin from the MCU/MPU without the need to route the Vcc to the device saves “significant” board space saving and simplified layout.
Following the I2C protocol, the EEPROM facilitate migration from existing EEPROM with less overhead and capability to connect up to eight devices on the same bus, claims the company. In addition to a security register with a 64bit factory programmed serial number, an extra 16 bytes of user programmable and permanently lockable storage, guarantees the unique serial number for inventory tracking, asset tagging and to permanently protect the data if needed.
Evaluation board simplifies NFC in wearables, IoT, smart cities
To accelerate the design of wearables, product identification, and smart-city applications, the Cloud-ST25TA evaluation board is based on STMicroelectronics’ ST25TA02K chip. Engineers can use it to start adding an NFC interface to any kind of electronic device, from Bluetooth audio products and wearable devices to NFC posters and business cards.
The board consists of a range of NFC Forum Type 4 tag chips with what is claimed to be the industry’s widest range of integrated EEPROM size (512bit up to 64kbit) with data retention times of up to 200 years. It also operates across the industry’s widest temperature range (-40 to +85°C), and can endure one million erase-write cycles.
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