SC9149AL Ver la hoja de datos (PDF) - Silan Microelectronics

Número de pieza

componentes Descripción

Fabricante

SC9149AL

INFRARED REMOTE CONTROL RECEIVER

Silan Microelectronics 

Silan

Semiconductors

SC9149A/SC9150A

Signal received by the light receiving element is sent through the amplifier to the detector where 38 kHz carrier

wave is eliminated and is input into the receiving signal input circuit . The receiving signal input circuit (Rx IN ) has a

built-in Schmitt circuit for shaping receiving signal waveform to eliminate rounding .

3. RECEIVING SIGNAL CHECK

The receiving signal check is to check 2 cycle transmitting signal sent from the transmitter to determine if it is

normal signal .

RECEIVING

SIGNAL

12 BITS

FIRST DATA

12 BITS

SECOND DATA

First , the first data is stored in the 12-bits shift register. Then, when the second data is put into the shift register ,

data is forced out of the shift register by one bit , where the first data has been stored .

Now , pushed out data and incoming data to see if they are same . If an error is caused in the receiving data 12-

bits check , the system is reset at that point of time . Conversely , when all receiving data are OK , output is raised

from "L" level to "H" level .

RECEIVEING

DATA

Reader

0.42ms

DATA "1"

0.84ms

Reader

DATA "0"

SHIFT PULSE

CHECK PULSE

The status of receiving data , shift pulse and check pulse is shown above . Shift pulse is provided in the data

center by taking frequency margins of the transmitter and the receiver into consideration .

4.Code Comparison

To prevent interference with other models , C1, C2 and C3 code bits are provided for checking whether the

transmitter and receiver codes agree each other .

Only when both codes agreed , internal latch strobe pulse is generated to latch receiving data and output is

raised from 'L" level . if both codes do not agree , no latch strobe pulse is generated and output remains at "L" level .

Code bits used differ depending upon receiver as shown below :

CODE BIT

C1

C2

C3

C2

1

0

0

1

1

1

C2,C3 are used for

SC9149A/9149AL/9149AHN

C1,C2 are used for SC9150A.

Code bit “0”, “0” can not be used.

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.2 2003.01.21

6

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