GENERAL DESCRIPTION

The PCA8521 can be used in infrared remote control transmitters. It generates output pulses, in accordance with the RC5 protocol, when a key is pressed. The IC does not contain a software programmable processor. However, it does contain a ROM in which the codes that have to be transmitted are stored. An example of an application diagram using a 20-pin IC is illustrated in Fig.7.

FEATURES

? RC5 protocol

? Maximum of:

– 56 keys (20-pin version)

– 30 keys (16-pin version).

? Option of multi-system or single system transmitter

– Multi-system: maximum 8 systems, selection by key

– Single system: maximum 8 different systems per IC, selection by jumper wire or switch.

? Power-down and key wake-up

? High output current (≤45 mA)

? Oscillator frequency of 432 kHz or 4 MHz

? Multiple key protection

? Option of 25 or 33 duty factor

? Contained in DIP16, SO16, DIP20 or SO20 packages.