Silan
Semiconductors
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.
SC6121
FEATURES
* CMOS Technology
* Low Operating Voltage (V
DD
=2.0~5.5V)
* Using SEL pin, SC6121 can support 64+6 function codes
* Customer Code can be selected
SOP-20
APPLICATIONS
* TV and VCR
* Audio Equipment
* Cable TV Tuner
* Cassette Deck
* Air Conditioner
* VCD and DVD ROM/Player
* Moniputer/Multi-Media Personal Computer System
ORDERING INFORMATION
SC6121-001
SC6121-002
ROM Content=0
Custom Version
PIN CONFIGURATION
KI0
KI1
KI2
KI3
REM
V
DD
SEL
OSCO
OSCI
Vss
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
CCS
KI/O0
KI/O1
KI/O2
KI/O3
KI/O4
KI/O5
KI/O6
KI/O7
LMP
SC6121
15
14
13
12
11
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2
2002-02-28
1
Silan
Semiconductors
BLOCK DIAGRAM
OSCI
OSCO
V
DD
Vss
SC6121
9
KI0
KI1
KI2
KI3
8
6
10
7
SEL
1
2
3
4
Key
Input
Scan
Circuit
OSC Circuit
Timing Generation
&Control Circuit
Optput
Control
Circuit
5
REM
Code Generation Circuit
11
LMP
20
Key Input/Output Scan Circuit
CSS
19
18
17
16
15
14
13
12
KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7
ABSOLUTE MAXIMUM RATING
(Tamb=25
°C,
unless otherwise specified)
Characteristic
Supply Voltage
Input Voltage
Power Dissipation
Storage Temperature
Operating Temperature
Symbol
V
DD
V
IN
Pd
T
stg
T
opr
Value
6.0
-0.3~VDD
250
-40~+125
-20~+75
Unit
V
V
mW
°C
°C
RECOMMENDED OPERATING CONDITIONS
(Tamb=25
°C,
unless otherwise specified)
Characteristic
Supply Voltage
Oscillation Frequency
Input Voltage
Custom Code Select Pull-Up
Resistance
Symbol
V
DD
fosc
V
IN
Rup
Min.
2.0
400
0
--
Typ.
3.0
455
--
100
Max.
3.3
500
V
DD
--
Unit
V
KHz
V
KΩ
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2
2002-02-28
2
Silan
Semiconductors
SC6121
Test conditions
Fosc =455KHz
Fosc =STOP
Vo=1.5V
Vo=0.3V
Vo=2.7V
Vo=0.3V
V
IN
=3.0V
V
IN
=0V
0.7 V
DD
0
0.7 V
DD
0
V
IN
=3.0V
V
IN
=0V
Vo=2.5V
Vo=1.7V
Pull Up V
IN
=3.0V
Pull Up V
IN
=0V
Pull Down V
IN
=3.0V
Pull Down V
IN
=0V
-3
5
0.5
1.5
1.1
0.2
-15
30
-0.2
2
-5.0
15
-15
1
5
-8.0
30
-30
1.5
30
-0.2
V
DD
0.3 V
DD
V
DD
0.4
7
-0.2
1.5
2.5
ELECTRICAL CHARACTERISTICS
(Tamb=25
°C,
V
DD
=3.0V,unless otherwise specified)
Parameter
Supply Voltage
Current Consumption 1
Current Consumption 2
REM High Level Output Current
REM Low Level Output Current
LMP High Level Output Current
LMP Low Level Output Current
KI High Level Input Current
KI Low Level Input Current
KI High Level Input Voltage
KI Low Level Input Voltage
KI/O High Level Input Voltage
KI/O Low Level Input Voltage
KI/O High Level Input Current
KI/O Low Level Input Current
KI/O High Level Output Current
KI/O Low Level Output Current
CCS Low Level Input Voltage
CCS High Level Input Current
CCS Low Level Input Current
CCS High Level Input Current
CCS Low Level Input Current
Symbol
V
DD
I
DD1
I
DD2
I
OH1
I
OL1
I
OH2
I
OL2
I
IH1
I
IL1
V
IH1
V
IL1
V
IH2
V
IL2
I
IH2
I
IL2
I
OH3
I
OL3
V
IH3
I
IH3
I
IL3
I
IH4
I
IL4
Min
2.0
Typ
3.0
0.1
Max
5.5
1.0
1.0
Unit
V
mA
µA
mA
µA
µA
mA
µA
µA
V
V
V
V
µA
µA
mA
mA
V
µA
µA
µA
µA
PIN DESCRIPTION
Pin No.
1~4
5
6
7
8
9
10
11
19~12
20
Symbol
KI0~KI3
REM
V
DD
SEL
OSCO
OSCI
Vss
LMP
KI/O0~KI/O7
CCS
I/O
I
O
--
I
O
I
--
--
I/O
I
Data Output Pin
Power Supply
Select Pin
Oscillator Pin
Oscillator Pin
Power Supply
Description
Key Input Pin Nos. 0~3
Output LED Indicator
Key Input/Output Pin Nos.0~7
Custom Code Scan Input Pin
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2
2002-02-28
3
Silan
Semiconductors
FUNCTIONAL DESCRIPTION
1. TRANSMISSION CODE
SC6121
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' C0' C0' C0' C0' C0'
C0 C1 C2 C3 C4 C5 C6 C7
C0 C1 C2 C3 C4 C5 C6 C7
D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
Leader
Code
Custom Code
8 bits
Custom Code'
8 bits
Key Data
8 bits
Key Data
8 bits
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:
KI/O0
KI/O1
KI/O2
KI/O3
KI/O4
KI/O5
KI/O6
KI/O7
KI0
KI1
KI2
KI3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2
2002-02-28
4
Silan
Semiconductors
SC6121
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
K21+K22
K21+K23
K21+K24
D0
1
0
1
D1
0
1
1
D2
1
1
1
D3
0
0
0
D4
1
1
1
D5
1
1
1
D6
0
0
0
D7
0/1
0/1
0/1
Note: D7=1 when SEL is connected to V
SS
, or D7=0 when SEL is connected to V
DD
.
OPERATION
K21
push
K21 Transmission
t >126ms
K22 to 24
push
D5+K22 to 24
Transmission
NO OPERATION
K21
K21 Transmission
36ms< t <126ms
K22 to 24
No Transmission
NO OPERATION
K21
No Transmission
-36ms< t < 36ms
K22 to 24
NO OPERATION
K21
t >126ms
K22 to 24
K22 to 24 Transmission
No Transmission
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2
2002-02-28
5
微控制器 MCU
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