Smart Cities

Position sensor is robust for use in robotics and military projects

Tue, Oct 08, 2019

Claimed to offer more robust performance than existing absolute encoders and better resolution and accuracy than traditional Hall effect sensors for industrial robotics and other demanding applications, the RAMK060 is a rotational absolute magnetic kit encoder from Vishay Intertechnology.

The high precision position sensor uses contactless technology to achieve above 13-bit accuracy, 19-bit resolution, and above 16-bit repeatability, reports Vishay, while maintaining robustness against external magnetic fields, moisture, airborne pollution, vibration, mechanical shock, and changes in temperature. It also has a useful electrical angle of 360 degrees and operates over a temperature range of -40 to +85 degrees C. Higher maximum temperature models are available on request.

According to Vishay, it is suitable for space-constrained applications, due to the rotor and stator kit design, the off-axis design (for hollow shaft mounting), the slim profile of around 6.5mm and weighing less than 55g.

The RAMK060 has an outside diameter of 60mm and inner diameter of 25mm. Several multi-turn variants are available, including connection to a backup battery when system power is off. SPI, SSI, or Biss-C output signals are available.

The RAMK060 is self-calibrating, to compensate for mechanical misalignment

Vishay’s patented design is particularly suited for applications that demand precise and repetitive motion such as arm joints for industrial robots and collaborative robots, steering wheels for automated guided vehicles; and machine tools used in printing, textile manufacturing, and milling.

Samples and production quantities of the RAMK060 are available now, with a lead time of 16 weeks for larger orders.

http://www.vishay.com

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Efficient NFC programming method for LED drivers

Fri, Oct 04, 2019

For fast implementation of near field communication (NFC) programming for LED drivers, Infineon Technologies has developed the NFC-PWM series NLM0011 and NLM0010.

The devices are NFC wireless-configuration ICs with configurable PWM output, primarily designed for LED applications. They enable NFC programming implementation by using a PWM signal directly to control the analogue driver IC.

Both devices have two operation modes, passive and active. In the passive mode, the LED driver module is not powered, and the PWM-related parameters can be configured wirelessly via the NFC interface. In the active mode, as soon as the V CC voltage supply is powered, a PWM output is generated according to the stored parameters. With an external R/C filter, the PWM signal is converted to the desired DC voltage to control the current output of an LED driver.

An integrated constant lumen output (CLO) function compensates the luminous flux drop (ageing effect) of the LED module by automatically adjusting the LED current to the ageing characteristics of the LEDs. With an integrated operation-time counter and stored LED degradation curve in the CLO table, NLM0011 automatically adjusts the PWM duty cycle to compensate for the LED degradation.

Fitting seamlessly to the mainstream analogue driver ICs, there is no need for firmware development input and, says the company, it   adopted into existing designs to replace the “plug-in resistor” current configuration concept. Non-volatile memory including unique identification data and 20 bytes free memory for user data is also featured in the devices.

The NLM0011 and NLM0010 can be ordered now in a SOT23-5 package.

NFC programming is an emerging technology designed to replace the “plug-in resistor” current setting method via contactless NFC interface. Besides improving the operational efficiency by enabling automatic programming in the manufacturing line, it can create significant flexibility in the value chain. With this it reduces the LED driver variants, simplifies the selection of LED modules, and allows end-of-line configuration.

http://www.infineon.com/nfc-pwm

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Buck-boost converter improves portable device efficiency

Thu, Oct 03, 2019

With a low quiescent current (IQ) in its class of 6-microA and a high peak efficiency of 96 per cent, designers can now maximise a portable device’s battery life with the MAX77827 buck-boost converter from Maxim Integrated Products.

This 1.5A high-efficiency, compact converter allows 1.8V to 5.5V input and 2.3V to 5.3V output, while providing the system stability needed to minimise abrupt or unexpected shutdowns.

During mode transition when VOUT is set to 3.3V with a 15 microsecond rise/fall time, the ripple is less than 1 per cent of the output voltage, says the company. Fast load transient response provides stable system voltage from transient loads pulling down the system voltage. In extreme harsh conditions of going from 0A to 1A load in 15 microseconds, MAX77827 undershoot is controlled to six per cent of the output voltage where the undershoot of the competitive solution is 12 per cent with a longer recovery time.

The MAX77827 addresses the power requirements of low-power wide-area network (LPWAN) applications, asset tracking devices and a variety of Internet of Things applications.

This converter is a suitable solution to support applications with low power requirements because, regardless of the battery voltage variations, it can automatically transition between buck and boost modes to provide a consistent output power supply.

This converter supports space-constrained designs as its WLP measures 2.04mm x 1.64mm and it is less than 15mm² total solution size. It features a single external resistor to set the output voltage to provide additional savings to an external component and board space.

“High adoption of lithium ion batteries in smart consumer electronics is driving the increasing demand for this market, which is projected to reach $106,493 million by 2024,” said Rishab Sharma, analyst for P&S Intelligence. “Complementary technologies that help prolong battery life and stability can only contribute to their continued growth.”

“For any system design where battery life is critical, there is no better solution than the MAX77827,” said Eric Pittana, director for Mobile Power Solutions at Maxim Integrated. “With the lowest quiescent current and highest efficiency, designers can truly optimize their solutions and maximize their system performance. Specifically, for applications such as GPS asset tracking devices with single-use discharge, prolonging battery life is essential.”

http://www.maximintegrated.com

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Green tags encourage green RFID products

Thu, Oct 03, 2019

Smartrac Technology Group introduces the Eagle Green tags, the latest in the company’s green tag program. The compact inlays and tags are targeted at retail-optimised applications.

Eagle Green uses plastic-free, fully recyclable paper as the substrate, foregoes adhesives as much as possible, and comes with a laser-cut aluminium antenna that allows the complete recycling of aluminium residues, resulting in a significant carbon footprint reduction. All products within the green tag programme aim to address businesses that recognise the importance of a greatly reduce environmental impact across all applications and markets.

The tags are among the smallest retail-orientated inlays with global performance available on the market. Both have passed Auburn University’s ARC categories A, B, C, D, F, G, I, K, M, Q, W2 and W5, and are available in dry and paper-tag delivery formats with a compact size of 44 x 28 mm / 1.7 x 1.1 in, which helps in the conversion for end-application usage.

Equipped with an NXP UCODE 8 IC, which shares memory size and typical IC features with NXP’s UCODE 7 IC, a self-adjust feature helps maximises product performance in challenging environments, offers improved read and write sensitivity and a fast encoding speed.

The chip has an integrated brand identifier function to prove product authenticity and a memory safeguard system to protect business data.

These tags benefit from Smartrac’s platform and data management capabilities to record and manage a complete set of unique transponder data, for example UID no, order no, batch no, or yield, at production level in a controlled and secure way. The company’s product digitisation solutions enable full traceability of delivered RFID products.

“Our new Eagle green tags not only demonstrate that Smartrac’s green tag programme is gaining momentum: it also reinforces our resolve to provide the market’s most versatile, most advanced, innovative and sustainable RFID products designed and certified for a broad range of applications,” said Hal Hikita, senior vice-president, product management at Smartrac.

https://www.smartrac-group.com

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