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EETE JULAUG 2015

TVS diode arrays offer ESD protection in 01005 flip chip Littelfuse has introduced four new ESD protection TVS Diode Arrays (SPA® Diode) that occupy less board space than similar industry offerings. The SP1013 and SP1014 TVS Diode Arrays fit into a standard 0201 footprint (0.52x0.27mm), but offer a 30 percent reduction in the board space required over other 0201 outline solutions, allowing more clearance between components. The SP1020 and SP1021 Series are packaged in the industry’s smallest ESD protection footprint, a 01005 flip chip measuring 0.181x0.230x0.440mm, while providing nearly 78 percent lower capacitance than similar market solutions. All four products feature back-to-back zener diodes to protect electronic equipment that may experience destructive electrostatic discharges (ESD). The back-to-back configuration provides symmetrical ESD protection for data or signal lines when AC signals are present. These robust diodes can safely absorb repetitive ESD strikes above the maximum level specified in the IEC61000-4-2 international standard (Level 4, ±8kV contact discharge) without performance degradation. The SP1020 and SP1021 Series’ very low dynamic resistance (0.32Ω) supports low clamping voltage needed for protecting modern electronics filled with small-geometry ICs. Low capacitance of 30pF (SP1013) and 6pF (SP1014) helps to preserve signal integrity and minimize data loss while offering more robust devices against electrical threats. Back-to-back 5V standoff (SP1013 and SP1014) or 6V standoff (SP1020 and SP1021) permits protection of most of the current and future user interfaces. Littelfuse www.Littelfuse.com Multi-port RF coaxial cable-to-board connector Molex Incorporated has introduced its multi-port RF (MPRF) coaxial cable-to-board interconnection products, providing printed circuit board (PCB) designers and test and measurement engineers with a secure electrical connection suitable for high vibration conditions. Featuring a rugged single housing design with dual latches to support the weight of the coaxial cables, the MPRF system ensures a secure multi-port RF I/O connection. The compact connectors also meet space demands for shrinking electronic devices in a variety of industries including telecommunications and networking; data communications and computing; medical; and aerospace and defence. “Smaller connectors can be more sensitive to environmental factors than their larger counterparts, especially in high vibration situations where they can either move within the housing or completely disengage and cause a system failure,” said Darren Schauer, product manager, Molex. “We designed the MPRF connectors to meet the miniaturisation needs of these next-generation devices while delivering an extremely durable solution that prevents the cables from becoming mis-aligned within the ruggedised housing.” With a 3.75-mm-pitch, the connectors accept 2.10-mm cable diameters (RG-316) for PCB space savings. The robust outer shell can withstand a minimum of 500 mating cycles, while the 1.00-mm contact wipe ensures proper engagement under extreme conditions. The 4-, 6- and 8-port configurations deliver greater design flexibility and the DC to 6 GHz frequency range supports a broad range of potential applications. The non-magnetic versions provide relative permittivity close to 1.0 and high signal-to-noise ratio (SNR) for imaging systems in medical and aerospace applications. Molex Incorporated www.molex.com Low-dropout LED drivers for any-colour chips Ams has posted details of the AS1111x family of high efficiency LED drivers designed to match current source bias for any colour LED, including white and blue. The devices can drive up to four high-current LEDs; the LED current can be adjusted using an external resistor (RSET) and dimmed with an external PWM signal via the EN pin. It only requires 150 mV headroom voltage to operate and when the devices are disabled, the supply current drops down to less than 1 μA. Features include; up to four channels of 40mA drive (for high brightness LEDs); 150 mV headroom to operate (efficiency & battery lifetime); analogue or PWM brightness control with high resolution; no switching noise for EMI-sensitive environments; and fewer external components required. LED current per output is 40 – 80 mA, with 3% LED-to- LED matching, from a supply voltage of 0.15 to 3.6V. Packaging is WL-CSP-6, 0.4 mm pitch (AS1111A & AS1111B), MLPD-8, 0.5 mm pitch (AS1111C). ams ams.com Built-in steering wheel sensors ward-off driver’s hand slip In cooperation with Guttersberg Consulting, Krippner Inc. has developed a foil-based sensing technology that can measure pressure in addition to position. In one implementation scenario, the SensoFoil could be used to measure the driver’s hand position and pressure on a car’s steering wheel. During normal driving, a driver is constantly moving his/her hands on the steering wheel, changing pressure as the fingers grip the wheel. By sensing how the driver’s hands are moving, the SensoFoil could detect if the driver has fallen asleep with their hands on the wheel or even if their hands had slipped off the steering wheel. This detection could trigger the correct safety protocol to either wake up the driver or to implement corrective measures, such as the vehicle taking full control to a safe stop along the road. In case of a medical emergency, the car could even drive itself to the closest medical emergency centre while sending out an alert to the appropriate authorities. The sensor can also be programmed for pressure in certain locations. This can be used in a vehicle to control various location, emergency, entertainment or communication systems. This same feature can be used in game controllers, aircraft, etc., as an economical way to add additional programmable capabilities to a controller or joystick device without the need for extra buttons or dials. Hoffmann+Krippner www.hoffmann-krippner.com www.electronics-eetimes.com Electronic Engineering Times Europe July-August 2015 41


EETE JULAUG 2015
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