SILAN SC9243, SC9243S Datasheet

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REMOTE CONTROL TRANSMITTER

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 ca
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.

BLOCK DIAGRAM

able of multiple keying; thus, a maximum of

VSS VDD OSCI OSCO TEST

1 20 3 2 4

KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7

Reset

Circuit

5
6
7
8

9
10
11
12

Key
Input
Scan

Circuit

Oscillator

Control

Frequency

Division

Circuit

Scan

Control

Key Output Signal

Generator

13 14 15 16 17

Oscillator

Circuit

Function

Generator

Circuit

SC9243

APPLICATIONS

*MiniCOMPO
* Video Cassette Recorder(VCR)
* CD-Player

* Audio Equipment

ORDERING INFORMATION

SC9243
SC9243S

Code

Output

Code

Generator

Circuit

CODE Port

Circuit

CODEKO0 KO1 KO2 KO3

DIP-20 Package
SOP-20 Package

LED

18
19

DOUT

DIP-20

SOP-20

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.28

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PIN CONFIGURATION

1

V

SS

2

OSCO

3

OSCI

4

TEST

5

KI0
KI1
KI2
KI3
KI4
KI5 KI6

6
7
8
9

10

SC9243

20

V

DD

19

OUT

D

18

LED

17

CODE

16

KO3
KO2

15

KO1

14

KO0

13

KI7

12
11

ABSOLUTE MAXIMUM RATING

(Tamb=>25°C

Characteristic Symbol Test conditions Value Unit

Supply Voltage V
Input Voltage With Respect To V

DD

V

ss

VDD=3 V All outputs floating Vss-0.3~VDD+0.3 V

IN

Power Dissipation Pd 300 mW
Storage Temperature Tstg -40~125
Operating Temperature T

OPR

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VDD=3 V -20~70

ELECTRICAL CHARACTERISTICS

(Tamb=25°C,VDD=3V)

Parameter Symbol Test conditions Min Typ Max Unit

Operating supply Voltage V
Operating Supply Current I

Stand-By Current I

All Function Operating 2.0 3.0 4.0 V

DD

Key On Without Load

DD

=455 KHz

F

OSC

All Keys Off Stops Oscillation

SB

Output Floating.
Input Leakage Current(KI0~KI7) I
Dout Driving Current I
LED Sinking Current I
Input High Level Voltage V
Input Low Level Voltage V

VIN=GND 1.0

IL

VDD=3V VO=1.5V 10 mA

OH

VDD=3V VO=1.5V -5 mA

OL

IH

IL

Oscillation Frequency fosc 400 455 800 kHz
Pull-down Resistor Rd KI0~KI7 Pins 100 200 400
Pull-up Resistor Rup Test Pin 25 50 100

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0.7 V

00.3VDDV

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

2

SC9243

-0.3 ~ 5.0 V

1000

1

DD

V

DD

Rev: 1.1 2002.02.28

°C
°C

µA

µA

µA

V

kΩ
kΩ

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PIN DESCRIPTION

Pin No. Symbol I/O Description

1VSS-- Negative Power Supply
2 OSCO O Oscillator Output Pin with Built-in Amplifier Circuit and Feedback Resistor
3 OSCI I 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

4 TEST I

5~12 KI0~KI7 I Key Matrix Input Pins. Each pin has a built-in pull-down resistor(200k Ohms)

13~16 KO0~KO3 O

17 CODE O
18 LED O Transmission Display Output Pin

19 D
20 V

OUT

DD

Pin is connected to the VSS, Test Mode is activated. Dout Pin output
waveform shrinks 15 times without 38KHz carrier waveform

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.

O Infrared LED Driving Output Pin

-- Positive Power Supply

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.

SC9243

S0 S1 S2 S4S3 S5 S6 S7 S0 S1 S2 S4S3 S5 S6 S7 D0 D2D1 D3 D4 D5 D6 D7

leader

Code

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.

System Code Key Data Code

D0 D2D1 D3 D4 D5 D6 D7

Key Data CodeSystem Code

Reference

Bit

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Rev: 1.1 2002.02.28

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2.REMOTE OUTPUT WAVEFORMS

SC9243 Remote Output Waveforms are given in the diagram below.(for fosc=455KHz)

DOUT Output Waveform

Key On

Data Transimission Waveformabort 108msabout 38ms

Data Transmission Waveform

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ContinuousTransmission Waveform

about 108ms

Key Data Code

SC9243

Key Data CodeSystem CodeSystemCodeLeader Pulse

9ms 17.92ms~36ms 27ms

4.5ms 4.5ms
9ms 1.2ms 2.25ms

01 1 10

0.56ms

0.56ms

Continuous Transmission Waveform

4.5ms 4.5ms

9ms

Carrier Waveform

2/3

1/3

38KHz

0.56ms

2.25ms

in case of S0(System Code Bit0)=0

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.

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.28

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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:

SC9243

KI0KI1 KI2KI3 KI4KI5 KI6KI7

K1 K2 K3 K4 K5 K6 K7 K8

K09 K10 K11 K12 K13 K14 K15 K16

K17 K18 K19 K20 K21 K22 K23 K24

K25 K26 K27 K28 K29 K30 K31 K32

SD0

Note:
System Code Diode Jumper

Key Nos.K8,16,24 and 32 (the Shift Keys ) can be pressed simultaneously or in any random order withother 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.

SD1 SD2 SD3 SD4 SD5 SD6

Key Switch

SDn Kn

Key In

SHIFT KEYS

KO0
KO1
KO2
KO3

CODE

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LED Pin

Low Activity

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.28

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