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App note: BLDC with hall effect sensors using SCT on LPC84x

Sunday, December 9th, 2018

Motor control on LPC84x MCU app note from NXP. Link here (PDF) This application note describes an implementation of brushless DC motor control with hall effect sensors using the SCTimer/PWM on LPC84x.

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App note: Ambient light sensor SFH5701

Sunday, December 9th, 2018

App note from OSRAM on their ALS device SFH5701, its operation and application method. Link here (PDF) The SFH5701 is a small, two-wire, linear output current ambient light sensor (ALS) with current amplifier and dark current compensation. The ALS is capable of resolving a wide range of ambient light levels...

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App note: Low-current charger provides battery backup from USB to 1-cell applications

Sunday, December 2nd, 2018

Another app note from Maxim Integrated on small current battery management. Link here (PDF) The circuit provides a 1-cell Li ion backup battery charger for low-current devices performing resistor limited current sharing

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App note: How to achieve greater accuracy in battery capacity readings for portable designs

Sunday, December 2nd, 2018

App note from Maxim Integrated on using fuel gauge IC to obtain accurate battery state of charge readings. Link here (PDF) Because a product’s runtime is limited by battery capacity, it’s critical to have a precise method for measuring the remaining battery capacity to avoid an unexpected shutdown. This application...

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App note: Single-Channel power supply monitor with remote temperature sense

Sunday, November 25th, 2018

App note from Linear Technology using their LTC2970 to monitor external temperature aside from doing power management. Link here (PDF) Many applications with a single power regulator can benefit from the monitoring and control features of a power supply manager, but most power supply manager ICs have more than one...

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App note: AMR angle sensors

Sunday, November 25th, 2018

Position measurement sensor using magnetoresistive technology discussed in this app note from Analog Devices. Link here (PDF) Anisotropic magnetoresistive (AMR), thin film materials are becoming increasingly important in today’s position sensing technologies. Magnetoresistive (MR) position measurement has many advantages over traditional technologies. Reliability, accuracy, and overall robustness are the primary...

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App note: Overcurrent event detection circuit

Sunday, November 18th, 2018

Sample overcurrent detection circuit from Texas Instruments. Link here (PDF) This is a unidirectional current sensing solution generally referred to as overcurrent protection (OCP) that can provide an overcurrent alert signal to shut off a system for a threshold current and re-engage the system once the output drops below a...

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App note: Active filtering in automotive audio applications

Sunday, November 18th, 2018

App note from Texas Instruments on isolating DC and high frequency noise in audio using their automotive op amps. Link here (PDF) Phone calls, emergency alerts, and music are just a few of the reasons that a high quality audio system is vital in automotive infotainment and clusters. Operational amplifiers...

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App note: Blood pressure monitor fundamentals and design

Sunday, November 11th, 2018

Application note from NXP on blood pressure monitor fundamentals using their medical oriented MCUs. Link here (PDF) Arterial pressure is defined as the hydrostatic pressure exerted by the blood over the arteries as a result of the heart left ventricle contraction. Systolic arterial pressure is the higher blood pressure reached...

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App note: How to eliminate over stress of MOSFET during start-up of flyback converter

Sunday, November 11th, 2018

App note from Richtek about their embedded soft-start function to eliminate MOSFET stress. Link here Switching Power Supply, compared to Linear Power Supply, is widely used due to its advantages, such as small size, light weight, high efficiency, etc. Flyback Converter, one of the switching power supply topologies, is most...

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App note: Common mode filter inductor analysis

Sunday, November 4th, 2018

App note from Coilcraft on the design and construction of common mode filter inductor. Link here (PDF) Noise limits set by regulatory agencies make solutions to common mode EMI a necessary consideration in the manufacture and use of electronic equipment. Common mode filters are generally relied upon to suppress line...

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App note: How current and power relates to losses and temperature rise on inductors and transformers

Sunday, November 4th, 2018

Coilcraft's app note on temperature rise due to losses on inductors and transformers. Link here (PDF) Core and winding losses in inductors and transformers cause a temperature rise whenever current flows through a winding. These losses are limited either by the allowed total loss for the application (power budget) or...

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App note: How to use LEDs with supervisory ICs for undervoltage and overvoltage fault indicators

Sunday, October 28th, 2018

Another app note from MAXIM Integrated utilizing supervisory chip and LEDs to indicate voltage faults. Link here Traditionally, supervisory ICs have been used to monitor voltage rails for undervoltage faults (UV). When a supply rail falls below a set threshold, the system is held in reset using the reset output...

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App note: How a SIMO PMIC enhances power efficiency for wearable IoT designs

Sunday, October 28th, 2018

App note from MAXIM Integrated on very compact PMIC using only single inductor to drive three independent switching regulators. Link here Small form factor and minimal power loss are key criteria for internet of things (IoT) hardware, particularly wearables. Meeting these criteria typically involves some tradeoffs. For example, to meet...

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App note: HT66FB574 single colour independent light streamer USB keyboard

Sunday, October 21st, 2018

Another app note from Holtek this time about their HT66FB574, a USB keyboard device that can support single color LED streamer. Link here (PDF) The video gaming industry is seeing continual increasing demand for multi-feature keyboards. These can include features such as keys with an individual LED which can display...

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App note: HT66FB574/572 colour effect USB mouse

Sunday, October 21st, 2018

App note from Holtek on using their HT66FB574/572 to develop color effect mice. Link here (PDF) Demands from the video gaming industry for different types of gaming mouse continue to expand. Adding a large number of RGB LEDs to the mice can produce different colours and brightness changes creating a...

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App note: Power battery charger application guidelines

Sunday, October 14th, 2018

App note from Holtek on smart battery chargers. Link here (PDF) Battery chargers usually are products which transfer alternating currents to low voltage direct currents and which are widely applied in various rechargeable battery application fields. According to different applications, battery chargers can be divided into two types, namely digital...

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App note: I/O emulated UART baud rate calibration

Sunday, October 14th, 2018

Software/bitbang method of baud rate calibration for micro without built-in UART, App note from Holtek. Link here (PDF) Not every HOLTEK MCU contains a Universal Asynchronous Receiver/Transmitter function, otherwise known as a UART. If this function is required, it can be emulated using software. However, the software accuracy will change...

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App note: Minimizing light flicker in LED lighting applications

Sunday, October 7th, 2018

Another application notes from Richtek this time on LED lamps flickering. Link here Applying LEDs in offline retrofit lamps seems straightforward, but should be done with care to achieve similar light quality as the conventional lamp that the user is trying to replace. Light flicker is one of the aspects...

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App note: Li-ion battery and gauge introduction

Sunday, October 7th, 2018

Richtek app note for Li-ion battery definitions and gauge introduction. Link here SOC is defined as the status of available energy in the battery and usually expressed as percentages. Because the available energy change depends on different charging/discharging currents, temperatures and aging effects, the SOC could be defined more clearly...

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