DRM081, Multi-Button IR Remote Control using the MC9RS08KA2 ...
DRM081, Multi-Button IR Remote Control using the MC9RS08KA2 ...
DRM081, Multi-Button IR Remote Control using the MC9RS08KA2 ...
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<strong>Multi</strong>-<strong>Button</strong> <strong>IR</strong> <strong>Remote</strong> <strong>Control</strong> <strong>using</strong> <strong>the</strong> <strong>MC9RS08KA2</strong>, Rev. 0<br />
Configuration of <strong>the</strong> <strong>IR</strong> <strong>Remote</strong> <strong>Control</strong> Unit<br />
Chapter 2<br />
Fundamentals of <strong>IR</strong> <strong>Remote</strong> <strong>Control</strong> Communication<br />
2.1 Configuration of <strong>the</strong> <strong>IR</strong> <strong>Remote</strong> <strong>Control</strong> Unit<br />
An <strong>IR</strong> remote control transmitter generates infrared rays to a receiver by ways of a digital control frame<br />
pattern. The infrared transmitting diode and <strong>the</strong> infrared receiving module are important components for<br />
an efficient <strong>IR</strong> transmission through air. The carrier frequency for home appliance applications is typically<br />
around 38kHz.<br />
A typical configuration of <strong>IR</strong> remote control is shown in Figure 2-1.<br />
KEYPAD<br />
REMOTE<br />
CONTROL<br />
TX MCU<br />
Digital <strong>Control</strong> Frame<br />
with 38kHz Carrier<br />
<strong>IR</strong> TX DIODE <strong>IR</strong> RX MODULE<br />
Infrared Rays<br />
Figure 2-1. Configuration of <strong>IR</strong> <strong>Remote</strong> <strong>Control</strong> Unit<br />
Demodulated Digital<br />
<strong>Control</strong> Signal<br />
Freescale Semiconductor 11
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