SC7461 Datasheet, PDF (8/14 Pages) Silan Microelectronics Joint-stock – INFRARED REMOTE CONTROL TRANSMITTER

Silan
Semiconductors
SC7461
5.SC7461 TRANSMISSION CODE
The SC7461 transmission code consists of a leader code, 13 bits custom code, and 8 bits key data codes. The
inverse code of both the custom and key data codes are also sent simultaneously; thus, allowing an extremely low
error rate in the system configuration. Please refer to the following diagram.
C0 C1 C2 C3 C4 C5 C6 C8 C9 C10 C11 C12 _{C0 C1 C2 C3 C4 C5 C6 C7 C8 C10 C11 C12 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7}
Leader Code
Custom Code (13 bits)
Custom Code (13 bits)
Key Data (8 bits)
FIGURE 13. REM OUTPUT CODES
Key Data ( 8 bits)
The leader code consists of a 9ms carrier waveform followed by a 4.5ms OFF waveform. It is used as the leader
for the following codes (Custom, Data and their respective inverse codes). Thus, when the reception is configured by
a microcomputer, the time relationship between the reception detection and other processes can be managed
efficiently. The code uses the PPM (Pulse Position Modulation) Method, with "1" and "0" differentiated by the time
between pulses.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2 2002-02-28.
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