App note: Capacitive Multibutton Configurations

in app notes by DP | 1 comment

capacitive_multitouch_config

A capacitive mutibutton configuration application note from Microchip describing how to scan and detect button presses on more than 4 capacitive buttons.

This application note will discuss three different
approaches to implementing multiple touch buttons
using Microchip microcontrollers. The first approach
creates a simple 4 sensor system using the on-chip
4-to-1 analog multiplexers tied to the inputs of the
comparator module. The second approach expands
the 4 sensor system of the first approach, into a 10
sensor system by combining pairs of the original 4
inputs. The third approach creates an expandable
system, which relies on multiplexing additional
sensors through an external analog multiplexer.

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Comments

  1. @matseng says:

    Strange…. I just read this appnote looking for info about the best methods of detecting touches on a matrix configuration of capsense buttons.. The PIC24JF64GB002 I use have 9 capsense pins so I can just do a straight x/y scan with 5×4 lines to get all my 20 buttons on the MCC8 touchable.

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