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CAM35C44

Infrared Communications Controller Chip CameraFR

SMSC -> Microchip 

INFRARED INTERFACE

The CAM35C44 infrared interface can support

various infrared protocols and transceiver

configurations. For more information consult the

SMSC Infrared Communication Controller (IrCC

2.0) specification.

Each byte is sent serially LSB first beginning

with a zero value start bit. A zero is signaled by

sending a 500kHz carrier waveform for the

duration of the serial bit time. A one is signaled

by the absence of carrier during the bit time.

IrDA SIR/FIR

Consumer IR

IrDA SIR (v1.0) specifies asynchronous serial

communication at baud rates up to 115.2kbps.

Each byte is sent serially LSB first beginning

with a zero value start bit. A zero is signaled by

sending a single infrared pulse at the beginning

of the serial bit time. A one is signaled by the

absence of an infrared pulse during the bit time.

IrDA FIR (v1.1) includes IrDA v1.0 SIR and

additionally specifies synchronous serial

communications at data rates up to 4Mbps.

Data is transferred LSB first in packets that can

be up to 2048 bits in length. IrDA v1.1 includes

.576Mbps and 1.152Mbps data rates using an

encoding scheme that is similar to SIR. The

4Mbps data rate uses a pulse position

modulation (PPM) technique.

ASKIR

The ASKIR infrared protocol allows

asynchronous amplitude shift keyed serial

communication at baud rates up to 19.2kbps.

The CAM35C44 Consumer IR interface is a

general-purpose synchronous amplitude shift

keyed encoder/decoder with programmable

carrier and bit-cell rates that can emulate many

popular TV Remote encoding formats; including,

38kHz PPM, PWM and RC-5. Each bit is sent

serially LSB first. The carrier frequency is

programmable from 1.6MHz to 6.25kHz. The

bit-cell rate range is 100kHz to 390Hz.

Hardware Interface

The CAM35C44 IR hardware interface is shown

in FIGURE 6. This interface supports two types

of IR transceiver modules. One interface type

requires a mode pin (IR Mode) to select the data

rate, while the other interface type requires a

second Rx data pin (IRRX3). The transceiver

interface type is selected with the HPMODE bit

D0 in CR03 as shown in TABLE 27 (see section

HPMODE, Bit 0 on page 25).

TABLE 27 - TRANSCEIVER MODULE INTERFACE TYPE SELECT

HP MODE (CR03.0)

FUNCTION

0

IR Mode

1

IRRX3

30

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