PCA8521BT Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Fabricante

PCA8521BT

Infrared remote control transmitter RC5

Philips Electronics 

Philips Semiconductors

Infrared remote control transmitter RC5

Product specification

PCA8521

Table 3 ROM bit description

BITS

M0L to M5L

M6L

M7L

M0H to M4H

M5H to M7H

FUNCTION

Command bits 0 to 5.

Field bit. This bit indicates whether command codes 0 to 63 are used (field bit is at logic 1) or

command codes 64 to 127 are used (field bit is at logic 0).

Inhibit bit. When this bit is at logic 1 no transmission will take place. When this bit is at logic 0

the appropriate code-word will be transmitted.

System bits 0 to 4.

Bank select. Will be stored in BS0 to BS2 when the ‘multi-system’ option is selected. With

single system bits M5H to M7H are don't care.

Pulse output

The bits of the remote control word, as indicated by the addressed ROM locations, are loaded into a shift register every

bit-time this register is shifted. The output is used to generate a logic 0 or a logic 1 in the biphase (Manchester) coding,

modulated with a frequency of 36 kHz. The duty factor of the modulation pulses may be selected (optionally) to be 25%

or 33.3%. The output of the pulse generator controls the output driver that can provide a maximum current of 45 mA.

handbook, full pagewidth

432 kHz

or

4 MHz

no key

end control

start input

OSCILLATOR

CLK1

4 MHz

STOP

432 kHz

DIVIDE BY 111

DIVIDE BY 12

SQ

CLK

RQ

CLR

Fig.4 Timer schematic diagram.

CLK2

pulse

INV

C0

CONTROL

TIMER

DIVIDE-BY-4096

C11

MBH035

1999 Jun 15

8

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