IRCC2.0 SMSC Corporation, IRCC2.0 Datasheet - Page 13

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IRCC2.0

Manufacturer Part Number
IRCC2.0
Description
Infrared Communications Controller
Manufacturer
SMSC Corporation
Datasheet
Receiver Bit Cell Synchronization
The
incoming ASK waveforms into NRZ data for the
SCE.
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.
Synchronization
resets the timer that is used in the sampling
process to eliminate errors due to timing
differences between the receive decoder and the
incoming bit period (Figure 6).
Consumer
The IrCC 2.0 uses the edges of the
Transmitter
Receiver
Using
mechanism,
IR
Tx Polarity bit = 1 (default)
Rx Polarity bit = 0 (default)
the
FIGURE 5 - REMOTE CONTROL ASK ENCODE/DECODE
Receiver
TV Tx Output
Receiver
SCE Tx Data
TV Rx Input
SCE Rx Data
Driver
any
demodulates
Bit
transition
Cell
13
1
Receiver synchronization can be disabled to
allow direct sampling of 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
Synchronization is disabled, and the system
software is used to measure the bit-cell period
from the oversampled data.
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.
1/Bit Rate
1/Carrier
0
Light
No Light
No Light
Light
1
Receiver Bit Cell
The learned

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