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NXP Kinetis KW41Z Multi Protocol Wireless Microcontrollers


The Kinetis KW41Z is the industry’s first true single-chip multi-protocol wireless microcontroller, supporting concurrent operation of Bluetooth® low energy (BLE) v4.2 and IEEE® 802.15.4 based Thread protocols for automation, home networks, and healthcare applications. NXP’s Kinetis KW41Z/31Z/21Z wireless microcontrollers


comprise three microcontrollers: The Kinetis KW21Z microcontroller supports 802.15.4-based networks such as Thread. The Kinetis KW31Z microcontroller supports BLE v4.2 and Generic FSK networks, and the Kinetis KW41Z supports BLE v4.2, Generic FSK networks, and 802.15.4 running concurrently. Built on an ARM® Cortex®-M0+ core, with up to 512 kBytes of flash and up to 128 kBytes of SRAM, the microcontrollers’ ultra-low-power, highly integrated connectivity, security and analog capabilities, make them ideal for portable, battery-powered applications. The microcontrollers also incorporate a buck-boost DC-DC converter to support a wide range of operating voltages from 0.9V to 4.2V, significantly reducing the peak current in receive and transmit modes. At the same time, the family delivers an excellent link budget that ensures the longest range of communication and


Maxim’s MAX17242/17243 DC-DC Synchronous Buck Converters


These high-efficiency, synchronous converters with integrated MOSFETs help minimize external component count and reduce total cost of solutions for a variety of applications, including power regulation and general- purpose point-of-load designs. The MAX17242/MAX17243 high-


efficiency, synchronous step-down DC-DC converters operate over a wide input voltage range of 3.5V to 36V, delivering up to 2A (MAX17242) and 3A (MAX17243) output current. The converters can operate in drop-out condition by running at 99 percent duty cycle, and generate a fixed output voltage of 3.3V at ±2 percent accuracy, with the ability


January 2017


high immunity to interference. The radio frequency (RF) section of the microcontrollers is optimized to require very few external components, achieving a small RF footprint on a board. The Kinetis KW41Z/31Z/21Z


microcontrollers are supported by two development tools, also available from Mouser. The FRDM-KW41Z Freedom development kit includes


two boards that allow engineers to evaluate wireless applications on the Kinetis KW41Z microcontroller. The kit includes everything necessary to quickly establish a wireless connection between the two boards, including PCB inverted F-type antennas and an SMA RF connector. The boards support buck, boost, and bypass DC-DC configurations and can be configured as a host or shield for connection to a host processor. The USB-KW41Z Wireless Packet Sniffer is a USB dongle that engineers can use to monitor wireless communication packets in the targeted network. The dongle easily connects to a PC after installation of the required monitoring software. Alternatively, engineers can use the USB dongle as a wireless node with an easy connection to a PC or other USB-enabled device.


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to program the output voltage between 1V and 10V. The devices use a current-


mode-control architecture and can be operated in the pulse-width modulation (PWM) or pulse- frequency modulation (PFM) control schemes. PWM operation provides constant frequency operation at all loads, and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and additionally skips pulses at light loads for high-efficiency operation. The low- resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout. The 20-pin, 5mm × 5mm


MAX17242 and MAX17243 devices are supported by corresponding evaluation kits, also available from Mouser. The MAX17242EVKIT


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evaluation kit operates over a wide input voltage range of 3.5V to 36V with an output set at 3.3V at 2A. The MAX172423VKIT evaluation kit operates over an input voltage range of 5.6V to 36V range with an output set at 5V at 3A.


More Information www.electronicsproductionworld.com EIU 25


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