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Posts Tagged ‘app note’

App note: HT45F3420 LED flashlight application

Sunday, February 26th, 2017

Holtek's HT45F3420 MCU provide LED flashlight application all in with minimal external components. Link here (PDF) In traditional LED flashlight application circuits, the battery is used to directly drive the LED which will cause uneven brightness levels and the possibility of damaged LEDs due to changing battery conditions. Using the...

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App note: BH45F0031 Earphone jack communication

Sunday, February 26th, 2017

Holtek's App note about their audio to digital signal converter chip BH45F0031 that together with an phone app, communication via audio phone jack is possible. Link here (PDF) The BH45F0031 is a Flash type 8-bit high performance RISC architecture microcontroller, which is designed for smart phone headset interface applications that...

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App note: Charging batteries using USB power

Sunday, February 19th, 2017

Fairly old application note from MAXIM Integrated about getting out power from USB ports. Link here (PDF) Many devices with rechargeable batteries use USB power to recharge the batteries while they are connected. This application note describes the power available from USB and how it can be used to charge...

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App note: Improve flicker performance of direct AC driven LED fixtures with self valley fill

Sunday, February 19th, 2017

Application note from ON Semiconductors on LED lighting flicker caused by its own AC supply by adding an improved self valley fill circuit. Link here (PDF) To provide power to LED loads from AC input, SwitchMode Power Supplies (SMPS) are generally used since LED need to be driven by regulated...

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App note: Using touch interface in harsh environments

Sunday, February 12th, 2017

Tough design and software reference from NXP of touch interface. Link here (PDF) The touch-sensing method is used to replace most of traditional tact switch inputs as a new type of human-machine interface used in home-appliance applications. However, using such kind of detection method in harsh environment is still a...

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App note: Water level monitoring

Sunday, February 12th, 2017

A reference design from NXP about water level detection using pressure sensor. Link here (PDF) Many washing machines currently in production use a mechanical sensor for water level detection. Mechanical sensors work with discrete trip points enabling water level detection only at those points. The purpose for this reference design...

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App note: Choose the right voltage regulator to extend battery life in wearables

Sunday, February 5th, 2017

App note from Maxim Integrated on wearable devices demanding reduced quiescent and shut down currents when in idle and in sleep mode in a voltage regulator. Link here Wearable devices have emerged as the next big market opportunity in the electronics industry. Smart watches are among the most popular wearable...

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App note: Voltage reference long-term stability reduces industrial process control calibration costs

Sunday, February 5th, 2017

Application note from Maxim Integrated about improved long term stability of their voltage references. Link here (PDF) Large industrial plants such as those in the oil, gas, electricity, pharmaceutical, and food and beverage industries rely on electronic instrumentation to provide accurate, stable measurements to control their processes. The stability of...

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App note: Designing reliable drones using proper circuit protection

Sunday, January 29th, 2017

Littelfuse's application note on drone circuitry protection, offering guard against overcharging its batteries, I/O and ESD protection. Link here (PDF) No doubt “pilot losing control” is behind many drone incidents and crashes. But what’s behind that “loss of control?” After all, even small recreational drones depend on a host of...

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App note: Magnetic sensors’ and reed switches’ capacitive Loads

Sunday, January 29th, 2017

An application note from Littelfuse on peak current considerations when reed switches and magnetic sensors are handling capacitive loads. Link here (PDF) When there is significant capacitance in a reed sensor, reed relay or reed switch circuit, the peak current and energy switched by the reed contacts should be considered....

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App note: Testing inductors at application frequencies

Sunday, January 22nd, 2017

An app note from Coilcraft on inductance and Q parameters which are the important factors of an inductor and how these values are found. Link here (PDF) The accurate measurement of an inductor has always been more difficult than the measurement of other passive components. The primary difficulty with coil...

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App note: Working voltage ratings applied to inductors

Sunday, January 22nd, 2017

Coilcraft's application note about why there are no voltage ratings specified on inductors. Link here (PDF) Voltage ratings are often specified for many electronic components, including capacitors, resistors and integrated circuits, but rarely for inductors. This article addresses the reasons why working voltage ratings are not typically published for inductors....

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App note: Operation evaluation of ultra low ON resistance MOSFET supporting quick charge for 1 cell Lithium ion battery protection

Sunday, January 15th, 2017

ON semiconductor's application note on faster charging of Lithium Ion batteries with consideration on heat suppression. Link here (PDF) Currently, because LiB (Lithium Ion Battery) is superior in current density and electromotive force, it becomes mainstream of batteries for mobiles such as smart phone. However, because LiB is weak at...

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App note: Application precautions: Power MOSFET application notes

Sunday, January 15th, 2017

Toshiba's application note on the things to consider when picking a power MOSFET. Link here (PDF) This document explains selecting MOSFETs and what we have to consider for designing MOSFET circuit, such as temperature characteristics, effects of wire inductance, parasitic oscillations, avalanche ruggedness, and snubber circuit.

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App note: Redefining a new state-of-the-art in microampere current-sense amplifiers

Sunday, January 8th, 2017

Silicon Lab's TS1100 and TS1101 current sense amplifier's features discussed in this app note. Link here (PDF) Sensing and controlling supply current flow are a fundamental requirement in most all electronic systems from battery-operated, portable equipment to mobile or fixed-platform power management and dc motor control. High-side current-sense amplifiers (or...

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App note: Multiple Capture/Compare/PWM (MCCP): Extending the functionality for low-cost motor control applications

Sunday, January 8th, 2017

Microchip's MCCP module on PIC32 devices demonstrate the built-in majority detection filter for simpler motor control drives. Link here (PDF) The motor control industry has been focusing on designing low-cost motor control drives for various applications. The consumer demand for low-cost motor control applications is driving this trend. Microchip has...

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App note: Add a “Black Box” fault logger to your “Big (or Small) Box” system

Sunday, January 1st, 2017

Application notes from Maxim Integrated on adding log functionalities in your system. Link here (PDF) This article describes how to add a "black box" functionality - nonvolatile fault logging - to networking, communications, industrial, and medical equipment. It outlines the benefits of recording fault data, including faster, more definitive failure...

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App note: Selecting current sensors and transformers

Sunday, January 1st, 2017

Selection guidelines from Coilcraft. Link here (PDF) Current sensors detect the flow of AC or DC current in a wire or circuit trace. They can be used to detect an on/off/ pulse current condition or to measure the magnitude of the current in the wire or trace. This discussion is...

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App note: Solid state relays input resistor selection

Sunday, December 25th, 2016

SSR or solid state relays input resistor recommendation app note from Vishay. Link here (PDF) Solid state relays (SSRs) are commonly driven by TTL or buffered CMOS logic gates. These gates, when used to sink current, provide adequate drive for SSRs. An open-collector output is not required to drive the...

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App note: The heat is on – High-power surface-mount resistors

Sunday, December 25th, 2016

Application notes from Vishay on effective heat dissipation for their aluminum nitride utilized resistors. Link here (PDF) The intent is to discuss a few techniques to manage the heat that is generated by high-power surface-mount resistors and the effects they will have on design space, complexity, and cost.

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