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App note: Clearing Xilinx FPGA configuration to allow boundary scan testing

Sunday, July 23rd, 2017

Another application note from XJTAG on preparing Xilinx FPGA for proper boundary scan testing. Link here When Xilinx FPGAs are configured it can restrict the boundary scan access to some signals on the device. One work-around for this problem is to configure the FPGA with a ‘blank’ image that closely...

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App note: Using a test reset section to initialise JTAG devices

Sunday, July 23rd, 2017

An app note from XJTAG about applying test reset to put some devices to JTAG compliant mode. Link here Some JTAG devices require a specific sequence of states to be applied to some signals in order to put the device into a JTAG-compliant mode. This application note describes how a...

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App note: Linear power MOSFETS basic and applications

Sunday, July 16th, 2017

Some examples of power MOSFETS application from this app note from IXYS Corporation. Link here (PDF) Applications like electronic loads, linear regulators or Class A amplifiers operate in the linear region of the Power MOSFET, which requires high power dissipation capability and extended Forward Bias Safe Operating Area (FBSOA) characteristics....

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App note: Depletion-Mode power MOSFETs and applications

Sunday, July 16th, 2017

IXYS Corporation's N-Channel power MOSFET selection and application. Link here (PDF) Applications like constant current sources, solid-state relays, telecom switches and high voltage DC lines in power systems require N-channel Depletion-mode power MOSFET that operates as a normally “on” switch when the gate-to-source voltage is zero (VGS=0V). This paper will...

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App note: Infrared (IR) Spectroscopy with the SFH 473X – Background & technology

Sunday, July 9th, 2017

Infrared spectroscopy by OSRAM and their SFH 473X broadband light emitters. Link here (PDF) Imagine you can check if the mangos on the market are sweet - without even touching them… Imagine you can verify if your prescribed medical tablets contain the life-saving compound – or if they are counterfeits…...

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App note: Ambient light sensors – General application note

Sunday, July 9th, 2017

Different ambient sensors differs on their ability to sense specific wavelength and introduce different ambient levels compared to human eye, here's a general application note from OSRAM. Link here (PDF) This application note introduces discusses ambient light sensing. The different types of ambient light sensors are described and related to...

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App note: USB Type C, CC Pin design considerations, high voltage design considerations for Type-C connector pins in systems supporting non-USB standard charging protocol and/or fault cases

Sunday, July 2nd, 2017

Another app note from Fairchild Semiconductors on USB Type C to USB legacy design considerations. Link here (PDF) When designing hardware systems with type C connectors, a designer also has to consider all legacy, standard, and nonstandard specifications that exist in the USB connector eco system. With the introduction of...

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App note: USB Type-C design considerations, USB Type-C adapters

Sunday, July 2nd, 2017

Type-C USB cable adapter design consideration app note from Fairchild Semiconductors. Link here (PDF) USB is a ubiquitous connector that is used by many customers and in many different applications. With the official release of the USB Type-C connector, many companies are racing to implement this new connector and the...

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App note: HT45F3630 power tool speed control switch application example

Sunday, June 25th, 2017

All in one motor control MCU HT45F3630 from Holtek. Link here (PDF) Aimed at the motor speed control product application area, HOLTEK has developed the HT45F3630, which is commonly used in electric drills, electric screwdrivers, lawn mowers and other similar product applications. This MCU provides a group of PWM high...

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App note: How to measure thermal resistance of LED emitters and LED arrays

Sunday, June 18th, 2017

Another white paper from Lumileds about LED thermal resistance. Link here (PDF) Thermal performance is the most critical factor of a well-designed LED lighting system. A lighting system with proper thermal design has higher efficacy, meaning more light can be extracted using less energy, and better long term reliability.

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App note: Flash for “Selfies”

Sunday, June 18th, 2017

Effective front facing camera flash discussed in this white paper from Lumileds. Link here (PDF) Smartphones are ubiquitous in everybody’s daily lives, a trend that shows no sign of slowing. A key component of the smartphone is the camera, which has gained market share over Digital Still Cameras due to...

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App note: DAC ICs: How many bits is enough?

Sunday, June 11th, 2017

A very old application notes from Analog Devices that tells about Nyquist Theorem, sampling rate and quantization used on DACs. Link here (PDF) At the heart of every digital audio playback system lies the single-most critical component for high-fidelity audio: the digital-to-analog converter (DAC). These converters handle the delicate task...

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App note: Influence of control loop by an output filter

Sunday, June 11th, 2017

Application note from Würth Elektronik about the effect of filters that are added to the output of switching regulators. Link here The output voltage of switching regulators has a voltage ripple that can disturb with electrical power supplied circuits and lead to electromagnetic disturbances. Thus output filters are often used...

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App note: Ceramic multilayer capacitors in HF SMPS applications

Sunday, June 4th, 2017

Development and improvement of ceramic multilayer capacitors in high frequency power supply filtering, a technical note from AVX. Link here (PDF) There has been an explosion of interest in the use of ceramic capacitors for high frequency power conversion applications. This interest is compounded with new designs striving for higher...

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App note: Output filter caps for mission critical applications

Sunday, June 4th, 2017

A great guide from AVX on output capacitor types and their specific uses based on ESR, ESL and temperature properties. Link here (PDF) This document discusses the effect of capacitors on output power quality. It evaluates and provides a comparison of different capacitor technologies, their high reliability qualification availability from...

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App note: Application of leaded resistors in energy meters

Sunday, May 28th, 2017

App note from Vishay about energy meter circuits and the use of leaded resistors on them. Link here (PDF) An electric meter or energy meter is a device that measures the amount of electrical energy supplied to a residence or business. It is also known as (k)Wh meter. The main...

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App note: Overcurrent protection with Thin Film resistors technology

Sunday, May 28th, 2017

A technical note about Thin Film fuses from Vishay. Link here (PDF) Thin film technology is an established technology for high-grade passive components, which has been proved and refined over decades. Its advantages in terms of accuracy, repeatability and stability are appreciated in mass production for billions of thin film...

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App note: Interfacing to analog switches: Driving the control input of an analog switch with 1.8 V or lower − Is it safe?

Sunday, May 21st, 2017

ON Semiconductor's analog switches let you drive with an input control voltage lower than Vcc. Link here (PDF) Analog switches are everywhere today. Due to their small size and low current consumption, they are popular in portable devices where they are effective in a variety of subsystems including audio and...

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App note: Consideration of self-pollution reduction for electronic systems

Sunday, May 21st, 2017

App note from ON Semiconductors discussing how locally generated EMI affects its own system and how to prevent it. Link here (PDF) This application note will address the problem of Electro Magnetic Interference (EMI) self pollution in which one part of an electrical systems such as cell phones and consumer...

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App note: Active capacitor discharge circuit considerations for FPGAs

Sunday, May 14th, 2017

Power down sequencing and discharging on FPGAs app note from Diodes Incorporated. Link here (PDF) FPGA’s need the different power rails to be powered up and down in a defined sequence. For power down, each sequenced rail needs to be fully off before the next rail is turned off. With...

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