Tag Archives: application note

App note: USB hardware design guide

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An app note from Silicon Labs with design guidelines for implementing USB host and device applications using USB capable EFM32 microcontrollers. Link here. (PDF!)

This document will explain how to connect the USB pins of an EFM32 microcontroller, and will give general guidelines on PCB design for USB applications. First some quick rules-of-thumb for routing and layout are presented before a more detailed explanation follows.
The information in this document is meant to supplement the information already presented in Energy Micro application notes AN0002 Hardware Design Considerations and AN0016 Oscillator Design Considerations, and it is recommended to follow these guidelines as well.

App note: Simple Switcher PCB layout guidelines

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Simple Switcher PCB layout guidelines from Texas Instruments, app note here (PDF!)

One problem with writing an application report on PCB layout is that the people who read it are usually not the ones who are going to use it. Even if the designer has struggled through electromagnetic fields, EMC, EMI, board parasitics, transmission line effects, grounding, and so on, he will in all probability then go on with his primary design task, leaving the layout to the CAD/layout person. Unfortunately, especially when it comes to switching regulators, it is not enough to be concerned with just basic routing/connectivity and mechanical issues. Both the designer and the CAD person need to be aware that the design of a switching power converter is only as good as its layout. Which probably explains why a great many of customer calls received, concerning switcher applications, are ultimately traced to poor layout practices.
Sadly, these could and should have been avoided on the very first prototype board, saving time and money on all sides.

App note: Bluetooth low energy digital pedometer demo design

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An application note (PDF!) from Microchip: A Bluetooth low energy digital pedometer demo design

A digital pedometer is a portable electronic device that counts each step a person takes by detecting the motion of the person’s body with an accelerometer.
This application note demonstrates the implementation of a Bluetooth Low Energy Digital Pedometer using the Microchip PIC16LF1718, a cost effective 8-bit microcontroller with extreme low power (XLP), the Microchip RN4020 Bluetooth 4.1 Low Energy Module, and the Bosch Sensortec BMA250E digital triaxial accelerometer.
The Microchip Pedometer Demo can be worn on the wrist like a bracelet/watch. The on-board RN4020 BLE module allows the pedometer demo to communicate with a smartphone or tablet on which the user’s exercise progress can be tracked. The pedometer demo is powered by a single 3V coin lithium battery (CR2032).

App note: IR remote control transmitter

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IR remote control transmitter application note (PDF!) from Microchip:

This application note illustrates the use of the PIC10F206 to implement a two-button infrared remote controller. The PIC10F2XX family of microcontrollers is currently the smallest in the world, and their compact sizes and low cost make them preferable for small applications such as this one.
Two example protocols are shown. The first is Philips® RC5, and the second is Sony™ SIRC. These two protocols were chosen because they are fairly common and their formats are well documented on professional and hobbyists’ web sites. They also demonstrate two differing schemes for formatting the transmission.

App note: Using the Configurable Logic Cell (CLC) to interface a PIC16F1509 and WS2811 LED driver

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An application note (PDF!) from Microchip on how to use CLC to interface a PIC16F1509 and WS2811 LED driver:

The Configurable Logic Cell (CLC) peripheral in the PIC16F1509 device is a powerful way to create custom interfaces that would otherwise be very difficult. One example is the single-wire PWM signal, used by the WS2811 LEDs, well known in LED video display systems. This application note will provide a simple demonstration of a WS2811 LED Strip driver.

App note: Using the Configurable Logic Cell (CLC) to interface a PIC16F1509 and WS2811 LED driver

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An application note (PDF!) from Microchip on how to use CLC to interface a PIC16F1509 and WS2811 LED driver:

The Configurable Logic Cell (CLC) peripheral in the PIC16F1509 device is a powerful way to create custom interfaces that would otherwise be very difficult. One example is the single-wire PWM signal, used by the WS2811 LEDs, well known in LED video display systems. This application note will provide a simple demonstration of a WS2811 LED Strip driver.