The USB keypad reference design demonstrates crystal free USB operation. Microchip has partnered with Lumvatech to demonstrate a low-cost aesthetic design, with touch capability and LED lighting integrated. All features are driven with a single PIC16F1459 MCU.
USB is one of the most common serial interfaces used in a wide variety of applications. The USB 2.0 module with clock recovery from USB host, eliminates the need of an external crystal and thereby saving BOM costs and space on designs. The PIC16F145X family and PIC18FXXK50 families feature Active Clock Tuning which guarantees 0.25% accurate 48Mhz internal oscillator across all temperature range when connected to USB host.
This design also features the integration of 18 touch buttons based on the Capacitive Voltage Divider (CVD) technique from Microchip. A matrix-based approach is followed where of the 9 ADC channels available, five are used for row detection and four for column detection. Two columns are also used for proximity detection. LED backlight for the keypad with auto power off and audio feedback using the piezo buzzer is also implemented.
The USB keypad reference design demonstrates crystal free USB operation. Microchip has partnered with Lumvatech to demonstrate a low-cost aesthetic design, with touch capability and LED lighting integrated. All features are driven with a single PIC16F1459 MCU.
USB is one of the most common serial interfaces used in a wide variety of applications. The USB 2.0 module with clock recovery from USB host, eliminates the need of an external crystal and thereby saving BOM costs and space on designs. The PIC16F145X family and PIC18FXXK50 families feature Active Clock Tuning which guarantees 0.25% accurate 48Mhz internal oscillator across all temperature range when connected to USB host.
For more detail: USB Keypad Demonstration - Crystal Free USB and mTouch™ Sensing Solutions
Related projects
CAN FD Node based on a PIC18 Microcontroller
The introduction sets the stage for an embedded systems project that involves developing a Embedded C CAN FD project using the MCP2517FD...
Communication & InterfacingLAN9662 Gigabit Switch: Optimized for Industrial Ethernet
Introduction It should come as little surprise therefore that one element of what is now more commonly referred to in some circles...
Communication & InterfacingPIC Microcontroller: Fundamentals & Applications for Students
Introduction Microcontrollers are the key components in the embedded systems market. A variety of embedded systems was formed and developed after the...
Communication & Interfacing10BASE-T1S Ethernet: Simplified OEM Design for Auto Devices
Introduction Cars these days are surrounded by technology. They come loaded with all sorts of electronic gadgets and sensors. This project wants...
Communication & InterfacingDesigning a Microcontroller Framework for PC-Based Control of Electrical Appliances
ABSTRACT The preference for personal computers as a platform for designing and implementing control algorithms is growing due to the ease of...
Communication & InterfacingEfficient Multichannel Data Acquisition with USB Connectivity using PIC Microcontroller
1. INTRODUCTION With the rapid advancements in embedded technology, there is a growing demand for a data acquisition system that combines fast...
Ibrar Ayyub
I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...