Block Diagram - Intel PXA27 Series Design Manual

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Block Diagram

to the PXA27x processor keypad controller. The recommended value for the pull-down resistors is

The voltage reference must be at the same level as VCC_IO.

Figure 18-2. Keypad Matrix and Direct Keys Block Diagram (with No Rotary Encoder)

Keypad Interface Controller

PXA27x Processor Family Design Guide

for example of a possible configuration (with no rotary encoder) when interfacing

Matrix Interface

Keypad Interface

Matrix Keypad (4x4)

KEYPAD_002_P2

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