All about Op Amp stability app note from Linear Technology. Well, it shouldn’t. We analog designers take great pains to make our amplifiers stable when we design them, but there are many situations that cause them to oscillate in the real world. Various types of loads can make them sing. Improperly designed feedback networks can […]
Category Archives: app notes
App note: FlexConnect applications
An app note (PDF!) on Microchips’ FlexConnect: The USB protocol calls for rigid system roles to maintain order. One processor acts as the Host which issues commands to the Device. In turn, the Devices respond to the Host’s commands. This implementation operates well where there is one central processor controlling a wide variety of support devices. […]
App note: Implementing the suspend indicator using microchip USB hubs
App note(PDF!) on Microchips’ USB hubs suspend indicator feature. The USB251xB / USB3x03 / USB253x / USB3x13 / USB46x6 product lines are a family of feature-rich, low power USB 2.0 hubs optimized for use in embedded systems where high performance and advanced functionality are critical design requirements. The USB251xB / USB3x03 / USB253x / USB3x13 […]
App note: USB device design checklist
Application note(PDF) on the design of various USB controllers from Microchip. The purpose of this application note is to provide a list of items that need to be considered when designing systems that incorporate the following categories of Microchip USB products: -USB 2.0 Hubs -USB 3.0 Hubs -Flash Media Controllers -Flash Media Controller Hub Combo […]
App note: Using a hardware or software CRC with enhanced core PIC16F1XXX in class B applications
An app note from Microchip: Using a hardware or software CRC with enhanced core PIC16F1XXX in class B applications (PDF!) Class B safety routines are increasingly used in microcontrollers to detect faults in safety-critical applications. The primary method for detecting faults in microcontroller program memory is by using a Cyclic Redundancy Check (CRC) as defined by the […]
App note: Decoupling solutions
App note (PDF) from KEMET on different decoupling capacitors for each board power line requirements. Integrated circuit (IC) technology has advanced over time, requiring innovative decoupling solutions that address decoupling needs over the entire power path from the main power supply to the logic gates on the IC. As one follows the path from the […]
App note: LED lighting and supercapacitors
An app note (PDF) from KEMET on coupling two high lifetime devices: LEDs and Supercapacitors. Light emitting diodes, or LEDs, have come to prominence in recent years in conventional lighting applications including flash lights, street lamps, traffic lights and emergency lighting. Their advantages over incandescent and compact fluorescent light sources include greater robustness, higher energy […]
App note: Bluetooth smart communication using Microchip RN4020 module and 16-bit PIC microcontroller
An app note from Microchip, Bluetooth smart communication using Microchip RN4020 module and 16-bit PIC microcontroller (PDF!): This application note provides the following: • Framework for any of the user application platform using RN4020 module and PIC24FJ series of microcontrollers. • Specifically an interface of RN4020 module with PIC24FJ128GA010 microcontroller. • Start up or reference code […]
App note: Design considerations for single-sided sensing applications of reflective assemblies
App note from TT Electronics on reflective assemblies and the surfaces they need to effectively detect/sense. A reflective sensor provides a major mounting advantage to the designer because only one side of a sensing surface is required. However, there are a number of design variables that need to be considered to assure detection of the […]
App note: Designing encoder elements for two channel optical interrupters
An app note from TT Electronics on design and getting information out of encoder elements of two channel optical interrupters. Rotational direction of a shaft can be readily determined by utilizing the two channels of a dual optical interrupter, an encoder disc with a number of openings around the circumference, and some simple electronics. The […]
App note: Introduction to USB Power delivery applications
Another application note from Microchip, an introduction to USB Power delivery applications (PDF!): This document is designed for systems and hardware engineers seeking the information necessary to begin to integrating USB Power Delivery (under Power Delivery Specification Rev 1.0) into their designs using the Microchip UPD1001 or UPD1002 USB Power Delivery Controllers
App note: Microchip dedicated slave devices in I2C systems
An app note on Microchip dedicated slave devices in I2C systems (PDF!): Microchip supplies dedicated slave devices that include a two-wire serial interface that is System Management Bus (SMBus) and I2C™ compatible. The SMBus specification is based on the I2C serial communications protocol, but with some differences. This document describes the key differences that may affect […]
App note: Photologic
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 of the integrated circuits and microprocessors has required the electronics world to turn digital. The […]
App note: Hall effect liquid level sensing
A hall effect sensor as liquid level sensor app note from TT Electronics.
Soundbar design from start to finish
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, intelligent product capable of emulating the audio experience of other multi-speaker installations. This is normally […]
App note: Magnetoresistive Sensors
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 (AMR) effect which occurs in ferrous materials, including Permalloy. Permalloy is an alloy of nickel […]
App note: Hall effect sensing and application
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) was in the 1950s as a microwave power sensor. With the mass production of semiconductors, […]
App note: Minimizing the temperature dependence of digital potentiometers (POTs)
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 reduced if the performance of the circuit is shifted from the TC of the end-to-end […]
App note: An introduction to LDO early warning function
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 processor in advance of an impending drop in supply voltage below a critical value. A […]
App note: Calibration of the AVR’s internal temperature reference
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. The temperature measurement is based on an on-chip temperature sensor that is coupled to a single […]