SC9149AHN SILAN [Silan Microelectronics Joint-stock], SC9149AHN Datasheet - Page 6

• Manufacturer Part Number: SC9149AHN
• Description: INFRARED REMOTE CONTROL RECEIVER
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

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
normal signal .
data is forced out of the shift register by one bit , where the first data has been stored .
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 .
center by taking frequency margins of the transmitter and the receiver into consideration .
4.Code Comparison
transmitter and receiver codes agree each other .
raised from 'L" level . if both codes do not agree , no latch strobe pulse is generated and output remains at "L" level .
The status of receiving data , shift pulse and check pulse is shown above . Shift pulse is provided in the data
To prevent interference with other models , C1, C2 and C3 code bits are provided for checking whether the
Only when both codes agreed , internal latch strobe pulse is generated to latch receiving data and output is
Code bits used differ depending upon receiver as shown below :
Signal received by the light receiving element is sent through the amplifier to the detector where 38 kHz carrier
The receiving signal check is to check 2 cycle transmitting signal sent from the transmitter to determine if it is
First , the first data is stored in the 12-bits shift register. Then, when the second data is put into the shift register ,
Now , pushed out data and incoming data to see if they are same . If an error is caused in the receiving data 12-
Silan
Semiconductors
RECEIVING
SIGNAL
HANGZHOU SILAN MICROELECTRONICS CO.,LTD.
SHIFT PULSE
RECEIVEING
CHECK PULSE
DATA
C1
C3
1
0
1
CODE BIT
FIRST DATA
12 BITS
0.42ms
Reader
C2
C2
0
1
1
DATA "1"
0.84ms
C2,C3 are used for
SC9149A/9149AL/9149AHN
C1,C2 are used for SC9150A.
Code bit “0”, “0” can not be used.
6
SC9149A/SC9150A
Reader
SECOND DATA
DATA "0"
12 BITS
Rev: 1.2
2003.01.21