Photologic components and applications from TT Electronics. Historically, optoelectronic components such as phototransistors have been analog output devices. The application engineer had to design with an output current from the phototransistor generated by a given input bias circuit. The advent … Read more
Category Archives: app notes
A hall effect sensor as liquid level sensor app note from TT Electronics.
Dafydd from Hacker Camp Shenzhen vol 2 works at TI and wrote this app note: The future of consumer home audio has shifted. The priority has moved from having speakers and wires all over the living room to a single, … Read more
Principle of operation of magnetoresistive sensors, app note from Honeywell. Magnetoresistivity is the ability of a material to change resistance under the influence of magnetic fields. There are several different magnetoresistive effects, but Honeywell sensors use the Anisotropic Magneto Resistive … Read more
Hall effect sensing introduction app note from Honeywell. The Hall effect has been known for over one hundred years, but has only been put to noticeable use in the last three decades. The first practical application (outside of laboratory experiments) … Read more
An app note from ON Semiconductors. The digital POT has two temperature dependent parameters, the TC of the end-to-end resistance RPOT and the ratiometric TC. The temperature dependence of the parameters of an analog circuit using a digital POT is … Read more
Supervisory reset delay prevents premature power fail resets, App note from ON Semiconductor. In today’s world of high speed, high power processors, new demands have been placed on the power source regulator. One example is the need to inform the … Read more
Another app note from Atmel, calibration of the AVR’s internal temperature reference (PDF!) This application note describes how to calibrate and compensate the temperature measurements from the ATtiny25/45/85. It can also be used on other AVR® microcontrollers with internal temperature sensors. … Read more
An app note from Atmel, voltage reference calibration and voltage ADC usage (PDF!): Features • Voltage reference calibration. – 1.100V +/-1mV (typical) and < 90ppm/°C drift from –10°C to +70°C. • Interrupt controlled voltage ADC sampling. • Calculation of voltage and … Read more
An app note going back to LCD display basics from Microchip. This application note provides an introduction to the basics of LCD: its construction, physics behind its operation, and the different factors affecting its properties and performance.
Adding a low-cost virtual graphics on embedded application, app note from Microchip. This application note describes the LCC Graphics Board that enables the implementation of a low-cost controllerless graphic method using a PIC32 microcontroller.
An app note from Atmel, digital sound recorder with AVR and DataFlash (PDF!): This application note describes how to record, store and play back sound using any AVR microcontroller with A/D converter, the AT45DB161B DataFlash memory and a few extra components. This application note … Read more
Clever way using linear regulator’s enable pin implementing a voltage supervisory circuit control, an app note(PDF) from ON Semiconductors. The combination of a voltage regulator and a voltage supervisor, is a popular circuit configuration. The addition of the supervisor ensures … Read more
App note(PDF) from ON Semiconductor. The load switch is controlled by the system, and connects or disconnects a voltage rail to a specific load. By turning unused circuitry off, the system as a whole can run more efficiently. The load … Read more
868 MHz, 915 MHz and 955 MHz inverted F antenna (PDF) application note from Texas Instruments: This document describes a PCB antenna designed for operation in the 868 MHz, 915 MHz and 955 MHz ISM bands. This antenna can be used … Read more
An app note (PDF!) from Renesas on how to minimize power consumption when sensing switch inputs A switch input is one of the simplest interfaces to an MCU. However, when very low power designs are needed the pullup or pulldown resistor … Read more
Here are STMicroelectronics’ portfolio of LED array drivers(PDF). The use of LEDs in applications like displays, information and advertising panels, signs, traffic signals, automotive lighting and architectural lighting is becoming more and more common. LED array drivers, with accurate constant … Read more
An app note(PDF) on smart on/off controller and voltage monitoring chip from STMicroelectronics. These devices allow easy and safe control of applications run with one or two push-buttons by securely starting or powering down a system and also resetting the … Read more
Linear Slew rate verification for wideband amplifiers from Linear, an app note (PDF) : Slew rate defines an amplifier’s maximum rate of output excursion. This specification sets limits on undistorted bandwidth, an important capability in A/D driver applications. Slew rate also influences achievable … Read more
App note: Self-starting can be hard to do – Understanding power-on-reset requirements in regulators and bandgaps
Things should be set-up properly before putting all load back again. Here’s a tip(PDF) from MAXIM on self-powering/recovering from power loss. Self-starting is a necessary but sometimes difficult task, whether it is motivating humans, starting cold automobiles, or providing power-on-reset … Read more