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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 (VDD=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 VDD 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 VDD 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=25C, unless otherwise specified)
Characteristic
Supply Voltage Input Voltage Power Dissipation Storage Temperature Operating Temperature
Symbol
VDD VIN Pd Tstg Topr
Value
6.0 -0.3~VDD 250 -40~+125 -20~+75
Unit
V V mW C C
RECOMMENDED OPERATING CONDITIONS (Tamb=25C, unless otherwise specified)
Characteristic
Supply Voltage Oscillation Frequency Input Voltage Custom Code Select Pull-Up Resistance
Symbol
VDD fosc VIN Rup
Min.
2.0 400 0 --
Typ.
3.0 455 -100
Max.
3.3 500 VDD --
Unit
V KHz V K
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 VIN =3.0V VIN =0V 0.7 VDD 0 0.7 VDD 0 VIN =3.0V VIN =0V Vo=2.5V Vo=1.7V Pull Up VIN =3.0V Pull Up VIN =0V Pull Down VIN =3.0V Pull Down VIN =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 VDD 0.3 VDD VDD 0.4 7 -0.2 1.5 2.5
ELECTRICAL CHARACTERISTICS (Tamb=25C,VDD=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
VDD IDD1 IDD2 IOH1 IOL1 IOH2 IOL2 IIH1 IIL1 VIH1 VIL1 VIH2 VIL2 IIH2 IIL2 IOH3 IOL3 VIH3 IIH3 IIL3 IIH4 IIL4
Min
2.0
Typ
3.0 0.1
Max
5.5 1.0 1.0
Unit
V mA A mA A A mA A A V V V V A A mA mA V A A A A
PIN DESCRIPTION
Pin No.
1~4 5 6 7 8 9 10 11 19~12 20
Symbol
KI0~KI3 REM VDD 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-FirstServed 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 VSS, or D7=0 when SEL is connected to VDD.
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
Silan Semiconductors
5. REMOTE OUTPUT WAVEFORMS The Remote Output Waveforms are given in the diagram below:
SC6121
Ex. fosc=455KHz Key ON Min. 36ms
1 58.5 to 76.5ms 108ms 2 3 108ms
1
9ms 4.5ms 13.5ms Leader Code Custom Code Custom Data Code 8bits 8bits Code 18ms to 36ms 58.5ms to 76.5ms Data Code 8bits
27ms
2
0.56ms
9ms 13.5ms
4.5ms 0
1
2.25ms
1
0
0
1
3
1.125ms
9ms 11.25ms
2.25ms
0.56ms
Carrier
8.77s
26.3s 9ms to 0.56ms Carrier Frequency---Fc=fosc/12=38KHz
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2 2002-02-28
6
Silan Semiconductors
SC6121 KEYS DATA CODE
The Keys Data Code is given in the table below.
SC6121
Data Code KI/O D0
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Key No. 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
Connection KI0
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
KI1
KI2
KI3
D1
0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
D2
0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1
D3
0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
D4
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
D5
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D6
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D7
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
KI/O0
KI/O1
KI/O2
KI/O3
KI/O4
KI/O5
KI/O6
KI/O7
Note: D7=1 when SEL is connected to VSS, or D7=0 when SEL is connected to VDD.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2 2002-02-28
7
Silan Semiconductors
TYPICAL APPLICATION CIRCUIT
VCC VDD IR LED 47F 0.1F 470 200pF 455KHz 200pF LED 270 1 47F
SC6121
9 1 2 3 4
KI0 KI1 KI2 OSCI
8
OSCO
6
VDD
11
LMP
5
REM SEL
VDD
7 10 20
SC6121
KI/O0 KI/O1 KI/O2 KI/O3 KI/O4 KI/O5 KI/O6 KI/O7
VSS CCS
KI3
19
18
17
16
15
14
13
12
IN4148
IN4148
IN4148
IN4148
IN4148
IN4148
IN4148
For Custom Code Selection 100K
100K
100K
100K
100K
100K
100K
100K
VDD
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.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2 2002-02-28
8
IN4148
Silan Semiconductors
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 resistor at least. * Recommended triode use 9014.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2 2002-02-28
9
Silan Semiconductors
PACKAGE OUTLINE
SC6121
UNIT: mm
SOP-20-375-1.27
10.2B 0.4
1.27 12.7B0.25 0.4B0.1 3.1MAX
11.43
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2 2002-02-28
10
0.25B 0.05
9.525(375)
7.6B
0.3
Silan Semiconductors
Attach Revision History
Data
2001.12.12
SC6121
REV
1.1
Description
Modify the "Typical application circuit"
Page
8 9 10
2002.02.28
1.2
Add the "PCB wire layout schematic" Modify the "Package outline"
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.2 2002-02-28
11

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