Application note from Texas Instruments on their bq77905 ultralow power stackable battery protector. Link here (PDF) The bq77905 is a 3-5S Low Power Protector with easy stacking capabilities for higher than 5S cell battery packs. This document provides an example for setting up a stacking configuration with the bq77905 and exhibits detailed analysis of the […]
Tag Archives: app note
App note: Sensorless speed stabilizer for a DC motor
Precision Microdrives’ sensorless speed sense by exploiting speed dependent back EMF voltage. Link here Motor speed is a parameter of a DC motor that is often measured and controlled, usually through additional sensors and with closed loop feedback. This method of speed control requires some form of speed sensor, normally mounted on the motor shaft. […]
App note: Advantages of eFuses versus PTC resettable fuses
The advantage of eFuses an application note from ON Semiconductors. Link here (PDF) Overcurrent protection is a basic necessity for electrical devices. While many people are familiar with fuses and household circuit breakers, few are intimately familiar with the kinds of overcurrent protection devices that are found in electronics. Though not a comprehensive list, there […]
App note: LDC0851 quick-start guide
Texas Instrument’s differential inductive switch LDC0851 application guide. Link here (PDF) Texas Instruments introduced the LDC1000 in 2012, the industry’s first inductance to digital converter. LDC1000 revolutionized the world of proximity sensing by delivering increased reliability, high resolution, and lower total system cost. The LDC1000 was soon followed by second generation multi-channel LDC devices like […]
App note: Inductor performance in high frequency DC-DC converters
Coilcraft’s application note on inductor performance or efficiency when used in high frequency applications. Link here (PDF) ESR vs frequency curves can be used to predict inductor losses in higher frequency converters, but careful consideration must be given to the wave shape (ripple current) of each application.
App note: General design considerations for MEMS microphones
Proper mounting of miniaturized MEMS from Cirrus Logic application notes. Link here (PDF) This application note offers recommendations in mechanical, PCB land pattern, and solder paste stencil design to deliver the best microphone performance in the final application design.
App note: Hipot testing of magnetic components
High voltage test between two isolated coils for isolation handling an application note from Coilcraft. Link here (PDF) This application note discusses the purpose of hipot (high potential) testing and how the hipot test relates to inductor and transformer safety.
App note: SOLERIQ® L38
OSRAM’s filament looking LED application note. Link here (PDF) SOLERIQ® L38 (GW T3LxF1) is a filament LED with a beam angle of 360deg for indoor retrofit lighting applications. It combines the advantages of modern LED technology with the aesthetics of traditional light bulbs. The construction of the SOLERIQ® L38 consists of a ceramic based frame […]
App note: Magnetometer placement in mobile devices
Correct magnetometer placement app note from Kionix. Link here (PDF) Electronic devices contain many parts which can affect a magnetic sensor. When deciding the mounting position, it is necessary to consider the types of materials and the amount of current carried in proximity of the magnetic sensor. Accuracy of an electronic compass depends upon getting […]
App note: Embedded orientation detection using the MMA8450Q
NXP’s accelerometer chip MMA8450Q, provides orientation detection on handheld devices. Link here (PDF) This application note targets the portrait/landscape orientation detection feature which has become standard in many hand-held electronic devices. Additionally, this application note aims to explain uses as well as highlight some of the challenges of designing an embedded algorithm into the sensor. […]
App note: Understanding linear resonant actuator characteristics
Application note about Linear Resonant Actuators from Precision Microdrives. Link here Linear Resonant Actuators (LRAs) are becoming more popular for haptic applications. They are an alternative to eccentric rotating mass vibration motors and have several distinct advantages. For example they have better haptic performance characteristics and are more efficient. For these reasons they are used […]
App note: Driving linear resonance vibration actuators
Linear resonance vibration actuators are great alternative to Eccentric rotating mass (ERM) motors, these are both used to vibrate handheld devices such as cellphones, driving LRAs is not the same as driving ERMs for such that LRA needs a specific resonant frequency. More on these on Precision Microdrives’ link here. Linear Resonance Actuators (LRA) use […]
App note: Implementing an I2C reset
Interesting app note from Analog Devices when an I2C communication is broken under some circumstances. Link here (PDF) The I2C bus is a high integrity, robust serial bus used for control purposes in many systems. The primary components that make up a system are at least one master and one slave. Under normal conditions, everything […]
App note: Environmental compensation on the AD7142: The effects of temperature and humidity on capacitance sensors
An old but useful application from Analog Devices about things that can affect touch/capacitance sensors. Link here (PDF) Capacitance sensing has the potential to replace current user input mechanisms in consumer devices. Products as diverse as cell phones, digital cameras, MP3 players, and other portable media players are all suitable for implementing capacitance sensing. Capacitance […]
App note: Implementing a line frequency meter
Circuit from Murata about line frequency measurement utilizing Murata’s DMS series digital voltmeters, LM2917 frequency-to-voltage converter and a transformer for isolation. Link here (PDF)
App note: Engineering scaling
Scaling large values to be fed on limited input digital meters, application note from Murata. Link here (PDF) It is oftentimes necessary to attenuate “large” input signals down to a level that more closely matches the input range of a selected meter. For example, suppose the signal to be measured is 19 Volts, and the input […]
App note: General overview of IR transmission in free ambient
Vishay’s general information about IR transmission in free ambient. Link here (PDF) Free ambient IR data transmission, IR remote control as well as most opto-electronic sensors and light barrier systems work with an optical wavelength between 870 nm and 950 nm. The emitter and detector components are highly efficient in this near IR wavelength band […]
App note: Using Vishay infrared receivers in a Wi-Fi environment
2.4Ghz and 5 Ghz Wi-fi signals can sometimes affect IR receivers, here’s Vishay’s app note about them. Link here (PDF) In recent years, Wi-Fi connectivity has penetrated most consumer electronic devices used for media reproduction. New TVs, satellite receiver and cable boxes, and streaming devices are more often than not built with Wi-Fi capabilities at […]
App note: High-speed level shifting using Si8XXX isolators
Silicon Lab’s Si86xx which provides digital isolation and voltage level shifting while Si823x as ISOdrivers, Link here (PDF) Voltage level shifting is common in analog and mixed-signal system applications. While several technologies implement level shifting (e.g., HVIC processes, discrete circuits, dedicated level shifting ICs), recent advances in CMOS isolation technology enables fast, reliable, and highly-integrated […]
App note: Novel current-sense measurement with automatic offset correction
Silicon Labs’ application note about a low power current measurement circuit using TS1001 nano power op-amp paired with low-power CY8C38 microcontroller, Link here (PDF) Pairing a simple circuit using nanopower analog op amps with a microcontroller can monitor single battery cells and solar harvesters. Pairing up a 0.65 V/1 µA nanopower op amp with the […]