User Guide

Figure 60 Key matrix

The capacitive sensors function by sensing changes in the charge coupled from one electrode to another

when the user's finger is placed close to the electrodes patterns in terms of the five-way cursor control.

Due to the construction of the module (keymat attached with proper pressure by unique jig) service requires

the unique jig to be replaced.

I/O expander and keyboard

HW53 supports I/O Expander. I/O expander is connected to Rapido via I2C bus and one GenIO is used as an

interrupt pin. Keyboard matrix 8x6 is connected to I/O expander. In addition to keyboard matrix the I/O

expander has general purpose IO:s.

RM-348; RM-349; RM-350

System Module and User Interface

Page 8 –16 COMPANY CONFIDENTIAL Issue 2