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INFRARED REMOTE CONTROL
TRANSMITTER
DESCRIPTION
The SC6121 is a remote control transmitter utilizing CMOS
Technology specially designed for use on infrared remote control
applications. It is capable of controlling 32 function keys and 3
double keys. SC6121 is housed in a 20-pins SO package.
FEATURES
* CMOS Technology
* Low Operating Voltage (V
* Using SEL pin, SC6121 can support 64+6 function codes
* Customer Code can be selected
APPLICATIONS
* TV and VCR
* Audio Equipment
* Cable TV Tuner
* Cassette Deck
* Air Conditioner
* VCD and DVD ROM/Player
* Moniputer/Multi-Media Personal Computer System
PIN CONFIGURATION
=2.0~5.5V)
DD
SC6121
SOP-20
ORDERING INFORMATION
SC6121-001
SC6121-002
ROM Content=0
Custom Version
KI0
KI1
KI2
KI3
REM
V
DD
SEL
OSCO
OSCI
Vss
1
2
3
4
5
6
7
8
9
10
SC6121
CCS
20
KI/O0
19
KI/O1
18
KI/O2
17
KI/O3
16
KI/O4
15
KI/O5
14
KI/O6
13
KI/O7
12
LMP
11
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
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Semiconductors
BLOCK DIAGRAM
KI0
KI1
KI2
KI3
OSCI OSCO V
89 6 10
1
2
3
Key
Input
Scan
Circuit
4
OSC Circuit
Timing Generation
&Control Circuit
Code Generation Circuit
Key Input/Output Scan Circuit
1819 1617 1415 1213
KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7
DD
Vss
Optput
Control
Circuit
ABSOLUTE MAXIMUM RATING
Characteristic Symbol Value Unit
Supply Voltage V
Input Voltage V
Power Dissipation Pd 250 mW
Storage Temperature T
Operating Temperature T
(Tamb=25°C, unless otherwise specified)
DD
IN
stg
opr
6.0 V
-0.3~VDD V
-40~+125
-20~+75
RECOMMENDED OPERATING CONDITIONS
Characteristic Symbol Min. Typ. Max. Unit
Supply Voltage V
Oscillation Frequency fosc 400 455 500 KHz
Input Voltage V
Custom Code Select Pull-Up
Resistance
DD
IN
Rup -- 100 --
(Tamb=25°C, unless otherwise specified)
2.0 3.0 3.3 V
0--VDDV
SC6121
SEL
7
REM
5
LMP
11
CSS
20
°C
°C
KΩ
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ELECTRICAL CHARACTERISTICS
Parameter Symbol Test conditions Min Typ Max Unit
Supply Voltage V
Current Consumption 1 I
Current Consumption 2 I
REM High Level Output Current I
REM Low Level Output Current I
LMP High Level Output Current I
LMP Low Level Output Current I
KI High Level Input Current I
KI Low Level Input Current I
KI High Level Input Voltage V
KI Low Level Input Voltage V
KI/O High Level Input Voltage V
KI/O Low Level Input Voltage V
KI/O High Level Input Current I
KI/O Low Level Input Current I
KI/O High Level Output Current I
KI/O Low Level Output Current I
CCS Low Level Input Voltage V
CCS High Level Input Current I
CCS Low Level Input Current I
CCS High Level Input Current I
CCS Low Level Input Current I
PIN DESCRIPTION
Pin No. Symbol I/O Description
1~4 KI0~KI3 I Key Input Pin Nos. 0~3
5 REM O Data Output Pin
6VDD-- Power Supply
7 SEL I Select Pin
8 OSCO O Oscillator Pin
9 OSCI I Oscillator Pin
10 Vss -- Power Supply
11 LMP -- Output LED Indicator
19~12 KI/O0~KI/O7 I/O Key Input/Output Pin Nos.0~7
20 CCS I Custom Code Scan Input Pin
DD1
DD2
OH1
OL1
OH2
OL2
OH3
OL3
IH1
IL1
IH1
IH2
IH2
IL2
IH3
IH3
IL3
IH4
IL4
(Tamb=25°C,VDD=3.0V,unless otherwise specified)
DD
Fosc =455KHz 0.1 1.0 mA
Fosc =STOP 1.0
Vo=1.5V -5.0 -8.0 mA
Vo=0.3V 15 30
Vo=2.7V -15 -30
Vo=0.3V 1 1.5 mA
VIN=3.0V 5 30
VIN=0V -0.2
IL1
IL2
VIN=3.0V 2 7
VIN=0V -0.2
Vo=2.5V 0.5 1.5 mA
Vo=1.7V 1.5 2.5 mA
Pull Up VIN=3.0V 0.2
Pull Up VIN=0V -3 -15
Pull Down VIN=3.0V 5 30
Pull Down VIN=0V -0.2
SC6121
2.0 3.0 5.5 V
µA
µA
µA
µA
µA
0.7 V
DD
00.3V
0.7 V
DD
00.4V
1.1 V
V
V
DD
DD
DD
V
V
V
µA
µA
µA
µA
µA
µA
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FUNCTIONAL DESCRIPTION
1. TRANSMISSION CODE
The transmission code consists of a leader code, 16-bits custom codes, and 8-bits data codes. The inverse
code of the data code is also sent simultaneously. The following diagram shows this one frame construction.
C0'
C0'
C0 C1 C2 C3 C5C4 C6 C7
Leader
Code
Custom Code
8bits
The leader codes consist of a 9ms carrier waveform followed by a 4.5ms OFF waveform. It is used as the leader
for the following code. Thus, when 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 "0" and "1" differentiated by the time between pulses. Each code consists of 8 bits, and
simultaneous transmission of the inverse code allows configuration of a system with an extremely low error rate.
2. KEY INPUT MATRIX
The Key Input Matrix of SC6121 if given below:
C0'C2C0'C3C0'C4C0'C5C0'C6C0'
C0
C1
Custom Code'
8bits
D0 D1 D2 D3 D4 D0 D1 D2 D3 D4 D5 D6 D7
C7
Key Data
8bits
D5 D6 D7
SC6121
Key Data
8bits
KI/O0
KI/O1
KI/O2
KI/O3
KI/O4
KI/O5
KI/O6
KI/O7
KI0
KI1
KI2
KI3
51 139 2117 2925
62 1410 2218 3026
73 1511 2319 3127
84 1612 2420 3228
3. KEY INPUT
A total of 32 keys can be connected by SC6121 Key Input Pins--KI0~KI3 and the Timing Signal Output Pins
KI/O0~KI/O7.
Double Key Operation is possible for only Key No.21 in combination with other keys connected to the KI/O5 line
namely: Key No.22,23 or 24.thus, only the following key combinations may be used for the double key operation:
1. Key Nos.21 and 22
2. Key Nos.21 and 23
3. Key Nos.21 and 24
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Pull-down resistors are connected between the Key Input and Vss Pins. When more than one key (except the
double key combinations: K21+22, K21+23, K21+24) are pressed simultaneously, the transmission output stops.
Two key inputs are regarded as being pressed simultaneously when the time interval between these two key
entries is less than 36ms.
The order of priority given to two key inputs with a time interval of more than 36ms is on a First-Pressed-First-
Served or Longer-Pressed-First-Served Basis.
When a key is pressed, the custom and data codes are read. 36ms later, the Remote (REM) Output is activated.
When the key is kept depressed during this 36ms, one transmission is outputted. If the key is depressed for more
than 108ms, then the only the leader code is transmitted continuously.
4. DOUBLE KEY OPERATION
Double Key Operation is useful for operations such as tape deck recording. The following table shows the Key
Data corresponding to the double keys pressed. Also refer to the Key Input Section.
The Double Key operation forms are as follows:
Key D0 D1 D2 D3 D4 D5 D6 D7
K21+K2210101100/1
K21+K2301101100/1
K21+K2411101100/1
Note: D7=1 when SEL is connected to VSS, or D7=0 when SEL is connected to VDD.
SC6121
K21
D5+K22 to 24
Transmission
No Transmission
No Transmission
OPERATION
K21
push
NO OPERATION
K21
NO OPERATION
K21
NO OPERATION
K22to24
K21 Transmission
t >126ms
K22to24
push
K21 Transmission
36ms< t <126ms
K22to24
No Transmission
-36ms< t < 36ms
K22to24
t >126ms
K22to24Transmission
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5. REMOTE OUTPUT WAVEFORMS
The Remote Output Waveforms are given in the diagram below:
Key ON
1
Min.
36ms
Ex. fosc=455KHz
1
58.5 to 76.5ms
108ms
2 3
SC6121
108ms
9ms
13.5ms
Leader
Code
2
3
Custom Code
4.5ms
8bits
18ms to 36ms 27ms
9ms 4.5ms
13.5ms
9ms
11.25ms
Custom
Code
58.5ms to 76.5ms
1.125ms
2.25ms
0.56ms
Data Code
8bits
0.56ms
2.25ms
Data Code
8bits
000111
Carrier
8.77µs
26.3µs
CarrierFrequency---Fc=fosc/12=38KHz
9ms to 0.56ms
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SC6121 KEYS DATA CODE
The Keys Data Code is given in the table below.
Connection Data Code Key
No.
KI0 KI1 KI2 KI3 KI/O D0 D1 D2 D3 D4 D5 D6 D7
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
K17
K18
K19
K20
K21
K22
K23
K24
K25
K26
K27
K28
K29
K30
K31
K32
Note: D7=1 when SEL is connected to VSS, or D7=0 when SEL is connected to VDD.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
00000000/1
KI/O0
•
KI/O1
•
KI/O2
•
KI/O3
•
KI/O4
•
KI/O5
•
KI/O6
•
KI/O7
•
10000000/1
01000000/1
11000000/1
00100000/1
10100000/1
01100000/1
11100000/1
00010000/1
10010000/1
01010000/1
11010000/1
00110000/1
10110000/1
01110000/1
11110000/1
00001000/1
10001000/1
01001000/1
11001000/1
00101000/1
10101000/1
01101000/1
11101000/1
00011000/1
10011000/1
01011000/1
11011000/1
00111000/1
10111000/1
01111000/1
11111000/1
SC6121
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TYPICAL APPLICATION CIRCUIT
VCC
F47F
0.1
455KHz
SC6121
V
DD
IR LED
470
LED
¡
270
¡
200pF200pF
47F
1
¡
9 8 6 11 5
KI0
1
KI1
2
OSCOOSCI
DD
REMLMPV
SC6121
KI2
3
KI3 KI/O0 KI/O2 KI/O3 KI/O4 KI/O5KI/O1 KI/O6 KI/O7
4
19 18 17 16 15 14 13 12
IN4148
IN4148
IN4148
IN4148
IN4148
For Custom
Code Selection
100K¡100K¡100K¡100K¡100K¡100K¡100K
Note:1. Two capacitance connect with Vcc should as near as possible.
2. The line between two capacitance and Vcc and ground should as short as possible.
IN4148
¡
IN4148
¡
100K
V
SEL
VSS
CCS
DD
V
DD
7
10
20
IN4148
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PCB WIRE LAYOUT SCHEMATIC:
SC6121
Transmitting tube output ground line
The transmitting tube ground line and IC ground line should
layout separated or overstriking ground line.
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
* Recommended triode use 9014.
resistor at least.
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PACKAGE OUTLINE
SOP-20-375-1.27 UNIT: mm
0.4
0.3
B
B
7.6
10.2
1.27
12.7B0.25
11.43
0.4
B
0.1
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10
SC6121
9.525(375)
0.05
B
0.25
3.1MAX
Rev: 1.2 2002-02-28
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Attach
Semiconductors
SC6121
Revision History
Data REV Description Page
2001.12.12 1.1
Modify the “Typical application circuit”
2002.02.28 1.2
Add the “PCB wire layout schematic”
Modify the “Package outline”
8
9
10
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Rev: 1.2 2002-02-28
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