High-speed CAN Transceiver

This project is fit for use in automotive and industrial network applications. As a Controller Area Network (CAN) transceiver, this device provides differential transmit capability to the bus and differential receive capability to a CAN controller at signaling rates up to1Mbps. The device is designed for operation in especially harsh environments and includes many device protection features such as under voltage lockout, over-temperature thermal shutdown, wide common-mode range, and loss of ground protection.

The MC34901WEF serves as an interface between a Controller Area Network (CAN) protocol controller and the physical bus and may be used in both 12V and 24V systems. The digital interface level is powered from a VPWR input supply providing true I/O voltage levels for the controller. The transceiver provides differential transmit capability to the bus and differential receive capability to the CAN controller. Due to the wide common−mode voltage range of the receiver inputs, the transceiver is able to reach outstanding levels of Electromagnetic Susceptibility (EMS). Similarly, extremely low Electromagnetic Emission (EME) is achieved by the excellent matching of the output signals.

The MC33901/34901 are SMARTMOS high-speed (up to 1Mbps) CAN transceivers providing the physical interface between the CAN protocol controller of an MCU and the physical dual wires CAN bus. They meet the ISO11898-2 and ISO11898-5 standards, and have low leakage on CAN bus while unpowered. It consumes very low current in standby mode and features automatic adaptation to 3.3 or 5V MCU communication.

High-speed CAN Transceiver – [Link]

Packt Free Learning Library

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We’ve opened up our library to help you build your skills and knowledge! Get a new FREE eBook every single day!

Every day Packt Publishing is giving away books for free to help teach new tech skills

Packt Publishing will be throwing open the virtual doors of its new Free Learning Library and offering its customers a daily chance to grab a fresh free eBook from its website. The publisher is encouraging people to learn new skills and try out new technologies and so every day it will be offering a different eBook from its huge list of titles free for anyone to download.

The Free Learning Library will be open year-round but each title will only be up for 24 hours, so make sure you keep checking back to get your hands on the latest book! Packt has well over 2000 titles published and the range of topics that could potentially feature is huge. From AngularJS to Zabbix, there’s going to be something to appeal to everyone – this is a great opportunity to try out a different technology or a new technique.

All you’ll have to do is simply click on the day’s free eBook and it will instantly be added to your account. New customers are also encouraged to take advantage, with the offer being a brilliant chance to try out Packt’s great range of books and products – all that’s required is a Packt account.

Packt Free Learning Library – [Link]

A better way to search for microphone components

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Last year, a Santa Clara, CA startup named GPiO set out to solve the problem of comparing hardware components across vendors. With a veteran audio engineer as one of their founders, they decided to start with the microphone component and grow from there to other verticals. They gathered more than 60 of the top microphones from vendors like Knowles, ST, Cirrus and Invensense, then measured them objectively in their own lab.

GPiO, has launched its site ( discovergpio.com ) and is allowing access to anyone on the web, targeting both professional engineering teams and electronics hobbyists alike. This is the definitive place to find a microphone that matches your design needs based on objective performance data and their listing includes analog, digital, ECM and MEMS varieties. The microphone category will soon be followed by battery management ICs and other categories.

Visit discovergpio.com to get a free account and view the microphone data.

A better way to search for microphone components – [Link]

Charging batteries rapidly and safely

F1x600

by Steve Taranovich @ edn.com

Any hobbyist can charge a battery quickly, but can you do it without an explosion, excessive heating or major degradation in battery cycle life?

Well many companies have managed fast charging techniques that typically use specialized algorithms. These algorithms take into account the chemistry of the battery and some sort of non-standard charging rate curve. Many device manufacturers and wireless operators are now providing a minimum two-year warranty on smart phone devices setting 800 cycles as the battery cycle life of the battery.

Charging batteries rapidly and safely – [Link]

Emon-server – 555 Timer as power usage sensor

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by dkroeske @ github.com:

A cheap 555 timer chip acting as Schmitt trigger combined with a phototransistor or LDR is taped to the ‘flashing light’ or ‘pulsing magnet’ on the electricity meter. The output of the 555 timer chip is connected to one of the GPIO pins on the Raspberry Pi. A Python script (executing in the background) recording 555 events is calculating actual energy usage [e.g. Watt] every time the 555 is signaling and stores epochs in an SQLite3 database. From this, another Python script (executed from e.g. cron) generates all kinds of energy usage information (e.g. kWh or kWday or whatever). Using Node.js (running on the same Pi) all data is ‘RESTified’ enabling spreading out to the W3. To maintain privacy JSON web tokens are required every time the service is queried. Oh, and there is also a Pimatic plugin available (here)

Emon-server – 555 Timer as power usage sensor – [Link]

With HAMMOND 1553W enclosures the rain won’t surprise you

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Favourite series 1553 hand-held enclosures are now available even in a water-resistant version with IP65 rating.

Ergonomic enclosures of the 1553 series with a non-slipping surface found their place on a market very quickly. Precise construction with brass bushings, stainless steel screws included, easy PCB placing on standoffs and other details make this series of enclosures universal for practically any “mobile” applications.

Despite very well fitting parts of an enclosure minimizing a possibility of a dust ingress into enclosure, there certainly are applications with a higher risk of water and dust penetration. For these cases the new “W” version is suitable, i.e. 1553W with integrated sealing and a whole construction designed so as to meet IP65 requirements. Fixing positions for screws are located outside the gasket ensuring sealing integrity.

Hammond 1553W series is available in “B”, “C” and “D” sizes, i.e. 1553WB (117x79x25mm), 1553WC (117x79x32mm) and 1553WD (147x90x25mm). All sizes are further available in two colours – whit-grey and black (GY/BK). Further details can be found in datasheets at particular types below this article.

With HAMMOND 1553W enclosures the rain won’t surprise you – [Link]

Single-cell 5-A Li-Ion battery charger with MaxCharge™ technology

 

BQ25890

TI’s new bq25890, bq25892, and bq25895 5A chargers with TI’s MaxCharge™ technology charge your mobile device faster while keeping your device cooler. The switch-mode chargers can charge a 1-S Li-Ion cell to 80% capacity in 30 minutes, while traditional devices only reach 30%. The I2C-controlled chargers’ high efficiency and thermal management result in the fastest, safest and coolest charging capability.

Key features and benefits

  • Fast charging to high capacity battery with up to 5A high charging current
  • Optimized for high voltage input: >91% charging efficiency at 3A with 9V input
  • Innovative Input Current Optimizer (ICO) to maximize input power without overloading adapter
  • Resistance compensation from charger output to cell terminal to enhance power delivery to battery
  • Integrated ADC for charging system monitoring

Single-cell 5-A Li-Ion battery charger with MaxCharge™ technology – [Link]

Technology breakthrough claimed by flexible electronics specialist

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Flexible electronics specialist FlexEnable says it has made a technology breakthrough which makes the manufacture of glass free LCDs practical and cost effective. Supporting the development, the company will demonstrate a full colour conformal in plane switching organic LCD at the forthcoming SID event in San Jose. It adds the display is light, thin and robust.

Flexible electronics specialist FlexEnable says it has made a technology breakthrough which makes the manufacture of glass free LCDs practical and cost effective. Supporting the development, the company will demonstrate a full colour conformal in plane switching organic LCD at the forthcoming SID event in San Jose. It adds the display is light, thin and robust.

Technology breakthrough claimed by flexible electronics specialist – [Link]

Buck controller allows 48V to 1V direct step-down

Intersil 8117

by Richard Quinnell @ edn.com:

Aiming to simplify design and increase power density in industrial systems, Intersil has developed the ISL8817 synchronous buck controller. The device accepts DC input voltages from 4.5V to 60 V and produces a selectable output voltage between 0.6V and 54V at up to 20A output current. Able to operate over a wide switching frequency (100 kHz to 2 MHz) with a low duty cycle (40 nsec minimum on time), the controller is able to step down from a 48V source to a 1V output in a single stage. This allows industrial applications using a 48V power distribution bus to provide the many voltages that modern CPUs and FPGAs require without the need for an intermediate low-voltage stage. This both increases power density in such systems as well as reducing conversion losses.

Buck controller allows 48V to 1V direct step-down – [Link]

LDO regulator squeezes into wearables

Semtech SC563by Susan Nordyk @ edn.com:

Housed in a tiny 1.6×1.2-mm, 0.6-mm thin package suitable for wearable electronics and other space-constrained battery-operated applications, the SC563 low-dropout regulator from Semtech provides two regulated outputs at up to 300 mA each, while its fixed output voltages eliminate the need for external resistor divider networks. The device’s ultra-small footprint and low dropout voltage of 180 mV enable designers to implement power supplies where small size and high efficiency are paramount.

The SC563 accepts an input supply voltage of 2.3 V to 5.5 V. It has separate input, output, and enable pins for each LDO channel. Using the lowest possible input voltage for each output voltage reduces the power loss for each rail. Quiescent current of just 50 µA for each channel helps extend battery life. The regulator also offers short-circuit, undervoltage lockout, and thermal protection to prevent device failures.

LDO regulator squeezes into wearables – [Link]