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EETE JUN 2015

Try out Intersil’s latest stepdown power module Reader O f f er This month, Future Electronics has 20 of Intersil’s ISL8203MEVAL2Z evaluation boards to give away to EETimes Europe’s readers. Worth 95 US dollars, the board was designed to demonstrate the performance of the ISL8203M dual step-down power module which integrates a PWM controller, synchronous switching MOSFETs, inductors, and passives all in a 9.0x6.5x1.83mm package. The ISL8203M is rated for dual 3A output current or 6A current sharing operation with an input range of 2.85V to 6V. Each of the two channels employs the current mode pulse width modulation scheme for fast transient response and pulse-by-pulse current limiting. The two channels each operate at a fixed 1MHz switching frequency, and are 180° out-of-phase, which reduces the input and output noise. The ISL8203M also offers internal digital soft-start, external synchronization, overcurrent protection, and over-temperature protection. The board is by default set up to demonstrate two 3A outputs independently, and can also be easily set up for current sharing 6A by changing placeholder resistors. It comes with a mechanical switch for enable and power-good LED indicator, connectors, test points, and jumpers for easy probing. Check the reader offer online at www.electronics-eetimes.com Low cost USB vector signal generator spans 100 MHz to 2.5 GHz Signal Hound, maker of USB-based RF test and measurement products, recently announced announced a vector signal generator that is USB-powered and weighs just 130 grams; the VSG25A costs $495 and features a frequency range of 100 MHz to 2.5 GHz with digital pattern generation. Output amplitude is -40 dBm to +10 dBm, with 100 MHz of modulation bandwidth. The VSG25A covers most telecom frequencies and two major ISM bands (902 MHz-928 MHz and 2.4 GHz-2.5 GHz). Covering FM broadcast bands, it can be used down to 80 MHz with reduced amplitude accuracy. Digital modulation comes as part of the VSG25A. Specific protocols are not supported—however, the modulation behind those protocols is supported. These include BPSK, QPSK, DQPSK, OQPSK, π/4 DQPSK, 8PSK, 16PSK, 16QAM, 64QAM, and 256QAM. Symbol rates from 4 kHz to 45 MHz are supported. With a 100 MHz of bandwidth and capability of producing synthetic noise sets of 1000+ tones (having randomphase relationships combined with the absence of tones in the test pattern’s centre), the VSG25A covers all needs. VSG25A sells for $495 or local equivalent. This includes software. An API is included that gives programmers access to AM/FM, pulse, multi-tone, PSK, QAM, and arbitrary waveform functions. Signal Hound www.signalhound.com Two-channel optocoupler for automotive bi-directional communications The R2Coupler ACFL-x21xT is a new family of optocouplers that are designed for deployment in automotive environments. Both the ACFL-521xT as well as the ACFL621xT are qualified according to automotive standard AECQ100 Grade 1. The model 521 is optimised for low-power systems and supports data rates up to 1 MBd while the model 621 aims at high-performance systems with data rates up to 15 MBd.As an extension to earlier R2Coupler models ACPL-KxxT, the new devices feature two optocoupler channels that are adjusted internally at an angle of 180 degrees. Thus they offer the best pin assignment for PCB layouts in bidirectional Tx/Rx data exchange circuits. In addition, both channels are completely decoupled and galvanically insulated, offering an ideal bidirectional communications interface for power systems. Whats more, the systems also feature a clearance and creepage distance of 8 mm, a high dielectric breakdown voltage (VISO) up to 5.000 VRMS for at least 1 minute as well as a high constant operating voltage up to 1.140 VPEAK. The coptocouplers come in a compact SSO- 12 package which offers comparable dimensions as the SSO-8 package of earlier component generations. Avago www.avagotech.com Kickstarter project offers indoor positioning on Arduino A group of young engineers in Ghent, Belgium, that go by the name Posyx, has developed an Arduino-compatible printed circuit board that can provide positioning and motion information that is accurate to within 10 centimeters. The group has said it will try to fund the initial volume production of the PCBs by a Kickstarter campaign starting in May. The board is based on the DWM1000 ultrawideband (UWB) ‘ScenSor’ module for real-time location from Decawave Ltd. (Dublin, Ireland) and the MPU9250 9-axis tracking device from InvenSense Inc. (San Jose, Calif.). There is also an MPL3115A2 pressure sensor from Freescale that can be used for barometric pressure and altitude measurement. The device can also act as temperature sensor. Pozyx does not provide dimensions for the board but it appears to be about 5cm by 6cm. Nonetheless the company is advocating customers purchase five of the boards -- to use four as “anchors” and the fifth as a tag. The anchor boards are put in fixed known positions and it is by communicating with these that the fifth board can determine its position. A typical application for the board would to aid a robot or drone vehicle navigate. The UWB communications are used not only for localization but also to send messages, which could be sensor measurements or remote control information for the robot. Pozyx www.pozyx.io 46 Electronic Engineering Times Europe June 2015 www.electronics-eetimes.com


EETE JUN 2015
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