SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
INFRARED REMOTE CONTROL TRANSMITTER OF 9012 CODE FORMAT
DESCRIPTION
SC9243 is an infrared remote control transmitter utilizing CMOS
Technology specially designed for electrical appliances such as Audio
System, Television, Video Cassette Recorder, CD Player and others.
SC9243 is capable of multiple keying; thus, a maximum of 144
instructions is possible. The pin assignments and application circuit are
optimized for easy PCB Layout and cost saving advantage.
FEATURES
* CMOS Technology, Low Power Consumption
* Least External Components
* Up To 144 Instructions (32 Basic + 112 Multiple Keys)
* Multiple Keying Is Possible
* Wide Range Of Operating Supply Voltage: 2~4 Volts
* 7 Out Of 8 System Code Bits Are Pre-Settable
* Interference From Other Equipment Or Apparatus Is Prevented.
APPLICATIONS
* Mini COMPO
* Video Cassette Recorder(VCR)
* CD-Player
* Audio Equipment
ORDERING INFORMATION
Part No.
SC9243
SC9243S
Package
DIP-20-300-2.54
SOP-20-375-1.27
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
ABSOLUTE MAXIMUM RATING (Tamb=>25°C)
Characteristics
Symbol
Test conditions
Supply Voltage
VDD
Input Voltage With Respect To Vss VIN VDD=3 V All outputs floating
Power Dissipation
Pd
Storage Temperature
Tstg
Operating Temperature
Topr VDD=3 V
Ratings
-0.3 ~ 5.0
VSS-0.3 ~ VDD+0.3
300
-40~125
-20~70
Unit
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS (Tamb=25°C, VDD=3V)
Characteristics
Operating supply Voltage
Operating Supply Current
Stand-By Current
Input Leakage Current(KI0~KI7)
Dout Driving Current
LED Sinking Current
Input High Level Voltage
Input Low Level Voltage
Oscillation Frequency
Pull-down Resistor
Pull-up Resistor
Symbol
Test conditions
Min. Typ. Max. Unit
VDD All Function Operating
2.0 3.0 4.0
V
IDD Key On Without Load fOSC=455
kHz
1000 µA
ISB All Keys Off Stops Oscillation
Output Floating.
1 µA
IIL VIN=GND
1.0 µA
IOH VDD =3V VO =1.5V
10
mA
IOL VDD =3V VO =1.5V
-5
mA
VIH
0.7 VDD
VDD
V
VIL 0 0.3 VDD V
fOSC
400 455 800 kHz
Rd KI0~KI7 Pins
100 200 400 k
Rup Test Pin
25 50 100 k
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
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SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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PIN CONFIGURATION
SC9243
PIN DESCRIPTION
Pin No.
1
2
3
4
5~12
13~16
17
18
19
20
Symbol
VSS
OSCO
OSCI
TEST
KI0~KI7
KO0~KO3
CODE
LED
DOUT
VDD
Description
Negative Power Supply
Oscillator Output Pin with Built-in Amplifier Circuit and Feedback Resistor
Oscillator Input Pin with Built-in Amplifier Circuit and Feedback Resistor
Test Pin with Built-in Pull-up Resistor. Typical value is 50k Ohms. When Test
Pin is connected to the VSS, Test Mode is activated. Dout Pin output waveform
shrinks 15 times without 38KHz carrier waveform
Key Matrix Input Pins. Each pin has a built-in pull-down resistor(200k Ohms)
Key Scan Output Pins. Normal Operation at “L”level when there is no Key
Input.
Code Scan Output Pin. This Pin is an open drain type and used for system
code setting.
Transmission Display Output Pin
Infrared LED Driving Output Pin
Positive Power Supply
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INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
FUNCTIONAL DESCRIPTION
1. TRANSMISSION CODE
The transmission code consists of a leader code, 16 bits system code, and 8 bits data code. The inverse of the
data code is also sent simultaeously. The following diagram shows this one frame construction.
It should be noted that System Code Bit 7(S7) has a fixed value of “1”.
The leader code consists of a 4.5 ms carrier waveform followed by a 4.5 ms OFF waveform. It is used as the
leader for the following codes. Thus, when reception is configured by a microcomputer, the time relationship
between the detection of the reception and the other processes can be managed efficiently. The code uses the
PPM (Pulse Position Modulation )Method, with “0”and “1”differentiated by the time between pulses.
2. REMOTE OUTPUT WAVEFORMS
SC9243 Remote Output Waveforms are given in the diagram below.(for fosc=455KHz)
DOUT Output Waveform
Key On
about 38ms
Data Transimission Waveform abort 108ms
Continuous Transmission Waveform
about 108ms
Data Transmission Waveform
Leader Pulse
System Code
System Code
Key Data Code
Key Data Code
9ms 17.92ms~36ms
01 1 01
4.5ms
4.5ms
9ms 1.2ms 2.25ms
0.56ms
Continuous Transmission Waveform
0.56ms
27ms
4.5ms
4.5ms
9ms
Carrier Waveform
0.56ms
2.25ms
in case of S0(System Code Bit 0)=0
2/3
1/3
38KHz
When oscillation frequency is 455 KHz, a signal is outputted after pulse is modulated by 38 KHz of duty 1/3
(which is 1/12 of the carrier generation circuit).
Note: In preparing the firmware of the receiving circuit, please strictly follow the following instructions:
1. System Codes: The same code is transmitted twice and therefore, always decode these 2 codes and check
if they are in agreement with each other.
2. Key Data Codes: The Key Data Code and its inversed code are always transmitted together, therefore,
check if they are in agreement with each other.
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SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
3. KEY MATRIX
SC9243 enables the maximum setting of up to 32 keys through a combination of KI0 to KI7 and KO0~KO3.
Furthermore, the System Codes are settable in 7 bits through the combination of KI0~KI6 and Code Key. Please
refer to the diagram below:
Key Nos.K8,16,24 and 32 (the Shift Keys ) can be pressed simultaneously or in any random order with other
keys (normal keys).
The system code setting is constructed by connecting the diode jumper between Code Key and KI0~KI6 keys.
With the diode jumper, the system code will have the value of “1”. If Code and any one of the KI0~KI6 keys are
connected only at one point, the diode jumper may be disregarded.
4.LED TERMINAL
When there is no key activity, the LED Pin is in the HIGH Level. Please refer to the diagram below.
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INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
SC9243 DATA CODE MAP 1 (ONE KEY PRESSED)
Key
No.
KO
Port
KI Port
D0
D1
D2
D3
D4
D5
D6
D7
K1 KI0 1 0 0 0 0 0 0 0
K2 KI1 0 1 0 0 0 0 0 0
K3 KI2 1 1 0 0 0 0 0 0
K4 KI3 0 0 1 0 0 0 0 0
KO0
K5 KI4 1 0 1 0 0 0 0 0
K6 KI5 0 1 1 0 0 0 0 0
K7 KI6 1 1 1 0 0 0 0 0
K8 KI7 0 0 0 0 0 1 0 0
K9 KI0 1 0 0 1 0 0 0 0
K10 KI1 0 1 0 1 0 0 0 0
K11 KI2 1 1 0 1 0 0 0 0
K12 KI3 0 0 1 1 0 0 0 0
KO1
K13 KI4 1 0 1 1 0 0 0 0
K14 KI5 0 1 1 1 0 0 0 0
K15 KI6 1 1 1 1 0 0 0 0
K16 KI7 0 0 0 0 0 1 1 0
K17 KI0 1 0 0 0 1 0 0 0
K18 KI1 0 1 0 0 1 0 0 0
K19 KI2 1 1 0 0 1 0 0 0
K20 KI3 0 0 1 0 1 0 0 0
KO2
K21 KI4 1 0 1 0 1 0 0 0
K22 KI5 0 1 1 0 1 0 0 0
K23 KI6 1 1 1 0 1 0 0 0
K24 KI7 0 0 0 0 0 1 0 1
K25 KI0 1 0 0 1 1 0 0 0
K26 KI1 0 1 0 1 1 0 0 0
K27 KI2 1 1 0 1 1 0 0 0
K28 KI3 0 0 1 1 1 0 0 0
KO3
K29 KI4 1 0 1 1 1 0 0 0
K30 KI5 0 1 1 1 1 0 0 0
K31 KI6 1 1 1 1 1 0 0 0
K32 KI7 0 0 0 0 0 1 1 1
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SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
SC9243 DATA CODE MAP 2 (WHEN SHIFT KEY K8 + OTHER KEYS ARE PRESSED)
Key KO KI Port D0 D1 D2 D3 D4 D5 D6 D7
No. Port
K1 KI0 1 0 0 0 0 1 0 0
K2 KI1 0 1 0 0 0 1 0 0
K3 KI2 1 1 0 0 0 1 0 0
K4 KI3 0 0 1 0 0 1 0 0
KO0
K5 KI4 1 0 1 0 0 1 0 0
K6 KI5 0 1 1 0 0 1 0 0
K7 KI6 1 1 1 0 0 1 0 0
K8 KI7
K9 KI0 1 0 0 1 0 1 0 0
K10 KI1 0 1 0 1 0 1 0 0
K11 KI2 1 1 0 1 0 1 0 0
K12 KI3 0 0 1 1 0 1 0 0
KO1
K13 KI4 1 0 1 1 0 1 0 0
K14 KI5 0 1 1 1 0 1 0 0
K15 KI6 1 1 1 1 0 1 0 0
K16 KI7
K17 KI0 1 0 0 0 1 1 0 0
K18 KI1 0 1 0 0 1 1 0 0
K19 KI2 1 1 0 0 1 1 0 0
K20 KI3 0 0 1 0 1 1 0 0
KO2
K21 KI4 1 0 1 0 1 1 0 0
K22 KI5 0 1 1 0 1 1 0 0
K23 KI6 1 1 1 0 1 1 0 0
K24 KI7
K25 KI0 1 0 0 1 1 1 0 0
K26 KI1 0 1 0 1 1 1 0 0
K27 KI2 1 1 0 1 1 1 0 0
K28 KI3 0 0 1 1 1 1 0 0
KO3
K29 KI4 1 0 1 1 1 1 0 0
K30 KI5 0 1 1 1 1 1 0 0
K31 KI6 1 1 1 1 1 1 0 0
K32 KI7
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INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
SC9243 DATA CODE MAP 3 (WHEN SHIFT KEY K16+OTHER KEYS ARE PRESSED)
Key KO KI D0 D1 D2 D3 D4 D5 D6 D7
No. Port Port
K1 KI0 1 0 0 0 0 1 1 0
K2 KI1 0 1 0 0 0 1 1 0
K3 KI2 1 1 0 0 0 1 1 0
K4 KI3 0 0 1 0 0 1 1 0
KO0
K5 KI4 1 0 1 0 0 1 1 0
K6 KI5 0 1 1 0 0 1 1 0
K7 KI6 1 1 1 0 0 1 1 0
K8 KI7
K9 KI0 1 0 0 1 0 1 1 0
K10 KI1 0 1 0 1 0 1 1 0
K11 KI2 1 1 0 1 0 1 1 0
K12 KI3 0 0 1 1 0 1 1 0
KO1
K13 KI4 1 0 1 1 0 1 1 0
K14 KI5 0 1 1 1 0 1 1 0
K15 KI6 1 1 1 1 0 1 1 0
K16 KI7
K17 KI0 1 0 0 0 1 1 1 0
K18 KI1 0 1 0 0 1 1 1 0
K19 KI2 1 1 0 0 1 1 1 0
K20 KI3 0 0 1 0 1 1 1 0
KO2
K21 KI4 1 0 1 0 1 1 1 0
K22 KI5 0 1 1 0 1 1 1 0
K23 KI6 1 1 1 0 1 1 1 0
K24 KI7
K25 KI0 1 0 0 1 1 1 1 0
K26 KI1 0 1 0 1 1 1 1 0
K27 KI2 1 1 0 1 1 1 1 0
K28 KI3 0 0 1 1 1 1 1 0
KO3
K29 KI4 1 0 1 1 1 1 1 0
K30 KI5 0 1 1 1 1 1 1 0
K31 KI6 1 1 1 1 1 1 1 0
K32 KI7
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INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
SC9243 DATA CODE MAP 4 (WHEN SHIFT KEY K24+OTHER KEYS ARE PRESSED)
Key KO KI D0 D1 D2 D3 D4 D5 D6 D7
No. Port Port
K1 KI0 1 0 0 0 0 1 0 1
K2 KI1 0 1 0 0 0 1 0 1
K3 KI2 1 1 0 0 0 1 0 1
K4 KI3 0 0 1 0 0 1 0 1
KO0
K5 KI4 1 0 1 0 0 1 0 1
K6 KI5 0 1 1 0 0 1 0 1
K7 KI6 1 1 1 0 0 1 0 1
K8 KI7
K9 KI0 1 0 0 1 0 1 0 1
K10 KI1 0 1 0 1 0 1 0 1
K11 KI2 1 1 0 1 0 1 0 1
K12 KI3 0 0 1 1 0 1 0 1
KO1
K13 KI4 1 0 1 1 0 1 0 1
K14 KI5 0 1 1 1 0 1 0 1
K15 KI6 1 1 1 1 0 1 0 1
K16 KI7
K17 KI0 1 0 0 0 1 1 0 1
K18 KI1 0 1 0 0 1 1 0 1
K19 KI2 1 1 0 0 1 1 0 1
K20 KI3 0 0 1 0 1 1 0 1
KO2
K21 KI4 1 0 1 0 1 1 0 1
K22 KI5 0 1 1 0 1 1 0 1
K23 KI6 1 1 1 0 1 1 0 1
K24 KI7
K25 KI0 1 0 0 1 1 1 0 1
K26 KI1 0 1 0 1 1 1 0 1
K27 KI2 1 1 0 1 1 1 0 1
K28 KI3 0 0 1 1 1 1 0 1
KO3
K29 KI4 1 0 1 1 1 1 0 1
K30 KI5 0 1 1 1 1 1 0 1
K31 KI6 1 1 1 1 1 1 0 1
K32 KI7
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INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
SC9243 DATA CODE MAP 5 (WHEN SHIFT KEY K32+OTHER KEYS ARE PRESSED)
Key KO KI Port D0 D1 D2 D3 D4 D5 D6 D7
No. Port
K1 KI0 1 0 0 0 0 1 1 1
K2 KI1 0 1 0 0 0 1 1 1
K3 KI2 1 1 0 0 0 1 1 1
K4 KI3 0 0 1 0 0 1 1 1
KO0
K5 KI4 1 0 1 0 0 1 1 1
K6 KI5 0 1 1 0 0 1 1 1
K7 KI6 1 1 1 0 0 1 1 1
K8 KI7
K9 KI0 1 0 0 1 0 1 1 1
K10 KI1 0 1 0 1 0 1 1 1
K11 KI2 1 1 0 1 0 1 1 1
K12 KI3 0 0 1 1 0 1 1 1
KO1
K13 KI4 1 0 1 1 0 1 1 1
K14 KI5 0 1 1 1 0 1 1 1
K15 KI6 1 1 1 1 0 1 1 1
K16 KI7
K17 KI0 1 0 0 0 1 1 1 1
K18 KI1 0 1 0 0 1 1 1 1
K19 KI2 1 1 0 0 1 1 1 1
K20 KI3 0 0 1 0 1 1 1 1
KO2
K21 KI4 1 0 1 0 1 1 1 1
K22 KI5 0 1 1 0 1 1 1 1
K23 KI6 1 1 1 0 1 1 1 1
K24 KI7
K25 KI0 1 0 0 1 1 1 1 1
K26 KI1 0 1 0 1 1 1 1 1
K27 KI2 1 1 0 1 1 1 1 1
K28 KI3 0 0 1 1 1 1 1 1
KO3
K29 KI4 1 0 1 1 1 1 1 1
K30 KI5 0 1 1 1 1 1 1 1
K31 KI6 1 1 1 1 1 1 1 1
K32 KI7
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SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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TYPICAL APPLICATION CIRCUIT
SC9243
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INFRARED REMOTE CONTROL TRANSMITTER

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PCB WIRE LAYOUT SCHEMATIC
SC9243
The above IC only use to hint, not to specified.
Note:
* In wire layout, the power filter capacitor should near to IC.
* In wire layout, should avoid power line and ground line too long.
* Recommended infrared transmit unit and IC ground line should layout separated, or overstriking lines.
* The emitter of triode connect 1 resistor at least.
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SC9243S (Silan Semiconductors)
INFRARED REMOTE CONTROL TRANSMITTER

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PACKAGE OUTLINE
DIP-20-300-2.54
SOP-20-375-1.27
SC9243
UNIT: mm
UNIT: mm
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INFRARED REMOTE CONTROL TRANSMITTER

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SC9243
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against
electrostatic discharge but they can be damaged if the following precautions are not taken:
Persons at a work bench should be earthed via a wrist strap.
Equipment cases should be earthed.
All tools used during assembly, including soldering tools and solder baths, must be earthed.
MOS devices should be packed for dispatch in antistatic/conductive containers.
Note: IC oscillator input mustn't be on the outside layer, thus to avoid the abnormal working when human body
touches the remote controller without crust in testing.
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INFRARED REMOTE CONTROL TRANSMITTER

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ATTACHMENT
Revision History
Data
2000.12.31
REV
1.0
2002.02.28
1.1
Description
Original
Modify the “Absolute maximum rating”
Modify the “Typical application circuit”
Add the “PCB wire layout schematic”
Modify the “Package outline”
SC9243
Page
2
11
12
13
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