IRCC2.0 datasheet(13/87 Pages) SMSC

13 / 87 page

Receiver Bit Cell Synchronization

The

Consumer

Receiver

demodulates

incoming ASK waveforms into NRZ data for the

SCE.

The IrCC 2.0 uses the edges of the

demodulated incoming infrared data to indicate

changes in bit state.

For continuous periods of high or low data

without transitions, the IrCC 2.0 samples the

signal level in the center of each incoming bit

period.

Using

the

Receiver

Bit

Cell

Synchronization

mechanism,

any

transition

resets the timer that is used in the sampling

process

eliminate

errors

due

timing

differences between the receive decoder and the

incoming bit period (Figure 6).

Receiver synchronization can be disabled to

allow

direct

sampling

the

demodulated

incoming infrared data stream at some preset

receive bit rate. This is useful in situations where

the speed of the receive data is not strictly

known. In such cases, the receive bit rate is set

as high as possible, the

Receiver Bit Cell

Synchronization is disabled, and the system

software is used to measure the bit-cell period

from the oversampled data.

The learned

parameters can then be used to switch to the

synchronized, fixed bit-cell mode to reduce

processing overhead in the host CPU for all

future transactions.

SCE Tx Data

TV Tx Output

Transmitter

TV Rx Input

SCE Rx Data

Driver

Receiver

1/Carrier

1/Bit Rate

No Light

Light

No Light

Tx Polarity bit = 1 (default)

Rx Polarity bit = 0 (default)

FIGURE 5 - REMOTE CONTROL ASK ENCODE/DECODE

IRCC2.0 Datasheet(PDF) 13 Page - SMSC Corporation

IRCC2.0 Datasheet(HTML) 13 Page - SMSC Corporation

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