Smart Cities

RS485-networking transceiver simplifies design to save space

Tue, Dec 04, 2018

Providing an external pin to select 20Mb its per second or 250kbits per second communication, the STR485LV is a 3.3V transceiver for RS485[1] applications that interfaces directly with low-voltage logic down to 1.8V.

The user-selectable data rate allows designers to specify the same device, simplifying inventory management for RS485-networking applications, ranging from high-speed/short-range up to the maximum communication distance (4,000 feet) depending on cable performance. The transceiver is suitable for telecomms infrastructure, high-speed data links, or low-voltage microcontroller communications.

Low voltage logic devices from 1.8V to 3.3V can be connected directly, without needing level-shifting components, advises ST Microelectronics, leveraging the 1.65 to 3.6V supply voltage range for data and enable signals. By maintaining internal driver-output resistance above 96Ohms up to 105 degrees C, the STR485 allows up to 256 transceivers on the same bus in accordance with the RS485 specification.

Features include thermal shutdown to prevent bus contention or faults causing excessive power consumption, and a receiver failsafe mode that prevents errors if inputs are idle, shorted, or unconnected. The bus pins withstand over ±8kV contact discharge and ±16kV air discharge without latch-up, exceeding IEC 61000-4-2 specifications, and are resistant to IEC61000-4-4 fast transient burst class-B.

Packaged as a 3.0 x 3m.0m DFN10, the STR485 has flow-through logic-to-bus pinning that simplifies board design, adds ST Microelectronics.

http://www.st.com

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Omnipolar Hall-effect sensors are stable over a wide operating range

Mon, Dec 03, 2018

Digital Hall-effect sensors from Diodes combine what the company describes as maket-leading stable operating and release points (Bop and Brp) with low power operation. The AH1911 and AH1912 sensors are both available in the industry standard SC59 package.

The AH1911 sensors will respond to either polarity of magnetic field, explains the company, and have a ‘hibernating clock’ system to reduce average current consumption to 1.6 microA at 3V supply.

The wide operating voltage range of 1.6 to 5.5V enables the parts to be used with a variety of system voltages. Operating and release points for the magnetic switch are tightly controlled over temperature and supply voltage due to a stabilising technique, delivering accurate and repeatable performance. Flux density switching points are typically ±60 Gauss (6mT) to operate and ±45 Gauss (4.5mT) to release.

Both the AH1911 and AH1921 are suitable for battery-powered devices where its low power consumption and wider operating voltage range promote extended battery life. Typical applications include medical and consumer products, tamper detection for e-meters, smoke detectors, IoT devices and general level/proximity detection.

The AH1911 and AH1921 feature push-pull and open-drain outputs, respectively. Both are specified to operate over the -40 to +85 degrees C temperature range and have a high ESD rating of 6kV (human body model).

This news story is brought to you by softei.com, the specialist site dedicated to delivering information about what’s new in the electronics industry, with daily news updates, new products and industry news.

http://www.diodes.com

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Asset management pinpoints vehicles for inventory tracking

Thu, Nov 29, 2018

Enhancing productivity in the automotive industry, Silicon Labs and Cognosos have collaborated to develop a wireless networking device to improve managing inventories.

Built on the Silicon Labs Flex Gecko system-on-a-chip (SoC), the Cognosos RadioTrax) tag enables employees to perform quick online searches or use their smartphones to pinpoint the location and movement history of cars stored in distributed car parks, increasing productivity and saving time.

Organisations with large inventories are frequently required to locate cars at a moment’s notice for maintenance, test drives or auctions. Large operations manage thousands of cars and often have multiple parking locations, creating a tracking challenge that can slow down business operations.

“Cognosos identified a time-intensive problem within the automotive industry and applied new IoT technology to create a superior experience for business operators,” said Ross Sabolcik, vice president and general manager of IoT products at Silicon Labs. “The Flex Gecko wireless SoC helped reduce the size, cost and complexity of the RadioTrax tag,” he added.

The end user uses a smartphone application to scan the RadioTrax tag and associates it by scanning the car’s VIN or stock number. The vehicle quickly shows up on a digital map, along with instructions on how to reach it. The Cognosos RadioTrax tag is secured to the visor or rear-view mirror of every car and transmits a sub-GHz radio message using patented wireless technology. The RF device includes an accelerometer to detect motion whenever the car is moved. Unlike previous RFID alternatives requiring extensive infrastructure and only showing the last known location of a car, RadioTrax displays the car’s real-time location.

Jim Stratigos, co-founder and CTO of Geo IoT platform provider, Cognosos, said: “The Flex Gecko SoC enabled us to pack more wireless and processing functionality into our device while using less power.”

Cognosos’ RadioCloud platform enables enterprises to deploy value-creating services with greater reliability and at a fraction of the cost of competing approaches.

Silicon Labs provides silicon and software for a smarter, more connected world, serving the IoT, internet infrastructure, industrial automation, consumer and automotive markets.

http://www.silabs.com

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Microswitch saves space in building automation

Wed, Nov 28, 2018

With the launch of the D2F-5 subminiature switch, Omron Electronic Components Europe says it has introduced its smallest ever microswitch with 5A rating.

The D2F-5 microswitch will push designers to minimise the application size, says the company. The rating of 5A means that the subminiature switches are suitable for high current applications. They have a minimum durability of 10,000 actions.

The D2F-5 switch measures just 5.7 x 12.7mm and a height from 5.5mm, depending on the operating lever chosen. The switches incorporate a snapping mechanism with two highly precise split springs that ensure long service life, assures Omron, while flux penetration is prevented by using insertion moulded terminals. The D2F-5 switch is available in variety of terminal variations including self-clinching PCB, left angled, right angled terminals, solder terminals and compact solder terminals.

Applications include building automation, ventilation and temperature control, safety and security, smart meters, lifts and elevators.

Omron Electronic Components Europe supplies electromechanical PCB relays, as well as components such as micro switches, MOSFET relays, DIP switches, photomicrosensors and connectors. Its portfolio of technologies includes MEMS based pressure, flow and thermal measurement sensors, human face and gesture recognition modules, vibration and tilt sensors.

Omron Electronic Components Europe supports its customers in Western and Eastern Europe, Russia and the CIS through eight regional offices, a network of local offices and partnerships with specialist, local, regional and global distributors.

http://components.omron.eu  

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