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Silan Semiconductors
INFRARED REMOTE CONTROL TRANSMITTER
DESCRIPTION
The SC50462 is a remote control transmitter utilizing CMOS technology specially designed for use on infrared applications. It has 64 functions and a total of 76 commands can be transmitted. Housed in 24 pins DIP package, SC50462 has 2 address bits.
SC50462
SDIP-24
FEATURES
* High performance CMOS technology * Low power consumption * Least external components. * Up to 76 instructions * Double key operation is possible.
SOP-24
APPLICATIONS
* Television remote control transmitter * Video cassette recorder(VCR) remote control transmitter
ORDERING INFORMATION
SC50462 SC50462S SDIP-24 Package SOP-24 Package
BLOCK DIAGRAM
Vss 1 Vcc 24 C5 22 C4 21
I1 13 I2 14 I3 15 I4 16 I5 17 I6 18 I7 19 I7 20 Output Buffer 23 OUT Key Encoder Timing Generator Code Modulator Instruction Decoder
4
CNTR
Scan Signal Generating Circuit
Oscillation Circuit
5 S1
6 S2
7 S3
8 S4
9 S5
10 S6
11 S7
12 S8
2 OSCI
3 OSCO
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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PIN CONFIGURATION
Vss OSCI OSCO CNTR S1 S2 S3 S4 S5 1 2 3 4 5 6 24 Vcc 23 OUT 22 C5 21 C4 20 I8 19 I7
SC50462
SC50462
7 8 9 18 I6 17 I5 16 I4 15 I3 14 I2 13 I1
S6 10 S7 11 S8 12
ABSOLUTE MAXIMUM RATINGS(Ta=25C)
Characteristic
Supply Voltage Input Voltage Output Voltage Power Dissipation Operating Temperature Storage Temperature
Symbol
VCC VIN VOUT PD Topr Tstg
Value
-0.3 ~ 5.5 Vss-0.3V ~ VCC+0.3V Vss ~ VCC 300 -10 ~ +70 -40 ~ +125
Unit
V V V mW C C
ELECTRICAL CHARACTERISTICS(Tamb=25C
Parameter
Operating Supply Voltage Operating Supply Current Stand-by Current Pull-Up Resistor(I1~I8) Pull-Up Resistor( C 4 , C5 ) Output Current(S1~S8) High level Output Current( OUT ) Low level Output Current( OUT ) High level Output Current( CNTR ) Low level Output Current( CNTR )
VCC=3.0V,Vss=0,Unless otherwise specified)
Symbol
VCC ICC1 ICC2 Rup Rup IOL IOH IOL IOH IOL
Test Conditions
Ta=20 ~ 70C Fosc=455kHz
Min
1.5
Typ
3
Max
5 0.3 1
Unit
V mA A k k mA mA mA mA mA
100 200 VOL=1.2V VOH=2V VOL=1V VOH=2V VOL=1V -0.2 5 -3 1 -3
250 350
400 500
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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PIN DESCRIPTION
Pin No.
1,24 2,3
SC50462
Description
Power Supply: Vcc=3.0V,Vss=0V Oscillator Input/Output Pin, 455 or 480kHz Crystal is connected between these pins. Transmitting Indicator. An LED and resistor are connected from this pin to Vcc. Key Scan Signal Output pins. Key Scan Signal Input pins. Custom Code Modulation Pin
Pin Name
Vss,Vcc OSCI,OSCO
Input/output
Power I/O
4 5~12 13~20 21,22 23
CNTR
O O I I O
S1~S8 I1~I8
C4 , C5 OUT
FUNCTIONAL DESCRIPTION
SC50462 is a sending signal IC on infrared remote control. Consisting of timing generating circuit, scan signal generating circuit, key input encoder, instruction decoder, custom code circuit, code encoder, and output buffer. It has 8*8 key matrix input and custom code with 16 bit PCM which shows 76 instructions.76Instruction are devided in 64 one shot signal and 12 2-shot signal. When Input Signal(I1~I8) and/or in combination with the Scan Signals(S1~S8) are activated, SC50462 checks the ID and the Custom Code Bits-- C 4 and C5 --setting before finally sending out the remote control signal.
1. CNTR OUTPUT
The CNTR Pin is the LED transmission Indicator. This means that Whenever a valid transmission is sent, the LED lights up. The CNTR output becomes "L" in the 7th pulse-rising and "H" in the 17th pulse-rising.
7th C0 OUT C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 17th D7
Next Frame
CNTR One Word
44ms or 46.4ms
Note: Oscillator Frequency=480 or 455kHz
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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2. OSCILLATING CIRCUIT
SC50462
An oscillator circuit may be constructed by using a 480kHz or 455kHz Crystal Resonator and two capacitors. Please refer to the following diagram. The carrier frequency transmitted is 40kHz or 37.9kHz.Unless any legal key input is activated, the oscillation is automatically stopped. Thus ,power consumption is considerably reduced.
SC50462
OSCI OSCO 480kHz/ 455kHz
2
3
200pF
200pF
3. KEY INPUT
A total of 64 keys may be connected by Input Pins(I1~I8) and Output Pins(S1~S8) to form an 8x8 Key Matrix. Double key operation is possible for only one of the keys--SW25~SW28 in combination with any one of the keys - SW11~SW13. Any other key combination are regards as illegal and will not generate any activity. Thus, only the following key combinations may be used for the doubled key operation:
I8 S1 S2 S3 S4
SW25
I7
I6
I5
I4
I3
I2
I1
SW11 SW12 SW13
Note:
SC50462 permits two keys function but only " allowed. " key are
S5
SW26
When you push one key of SW11/12/13, you can push with another key of SW25/26/27/28. Otherwise, other conditions are
S6
SW27
S7
SW28
S8
illegal.
SW25 and SW11 SW25 and SW12 SW25 and SW13 SW27 and SW11 SW27 and SW12 SW27 and SW13
SW26 and SW11 SW26 and SW12 SW26 and SW13 SW28 and SW11 SW28 and SW12 SW28 and SW13
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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4. TRANSMISSION CODE
SC50462
The transmission Code consists of 16 bits, namely: 8 bits custom code(C0~C7 ) and 8 bits data code (D0~D7). Please refer to the table below:
C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7
Custom Code
Data Code
One frame of the Transmission Code
If a Single Shot Key is depressed, data Codes--D6 and d7 will be given the value of (0,0).Please refer to the table1.If a valid double key operation is performed, the data codes will receive the values described in Table 2.
Scan Output
S1 S2 S3 S4 S5 S6 S7 S8
Data D0
0 1 0 1 0 1 0 1
D1
0 0 1 1 0 0 1 1
D2
0 0 0 0 1 1 1 1
Octal display
0 1 2 3 4 5 6 7
Key Input
I1 I2 I3 I4 I5 I6 I7 I8
Data D3
0 1 0 1 0 1 0 1
D4
0 0 1 1 0 0 1 1
D5
0 0 0 0 1 1 1 1
Octal display
0 1 2 3 4 5 6 7
Table 1: Key Matrix/Code
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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Scan Output
S5/I2 (SW25) S1/I1 (SW11) S6/I2 (SW26) S7/I2 (SW27) S8/I2 (SW28) S5/I2 (SW25) S2/I1 (SW12) S6/I2 (SW26) S7/I2 (SW27) S8/I2 (SW28) S5/I2 (SW25) S3/I1 (SW13) S6/I2 (SW26) S7/I2 (SW27) S8/I2 (SW28)
SC50462
Data Code Octal Display D5
0 0 0 0 0 0 0 0 0 0 0 0
D0
0 1 0 1 0 1 0 1 0 1 0 1
D1
0 0 1 1 0 0 1 1 0 0 1 1
D2
1 1 1 1 1 1 1 1 1 1 1 1
D3
1 1 1 1 1 1 1 1 1 1 1 1
D4
0 0 0 0 0 0 0 0 0 0 0 0
D6
1 1 1 1 0 0 0 0 1 1 1 1
D7
0 0 0 0 1 1 1 1 1 1 1 1
D0~D2
4 5 6 7 4 5 6 7 4 5 6 7
D3~D5
1 1 1 1 1 1 1 1 1 1 1 1
D6~D7
1 1 1 1 2 2 2 2 3 3 3 3
Table 2: Double Key Signal/Code
5. CUSTOM CODE
SC50462 has a total of 8 bits custom code (C0~C7). Custom Code Bits -C4 and C5 can be externally selected using the C 4 and C5 Terminals. The C 4 and C5 pins are inversed; therefore, if the C 4 and C5 terminals are pulled HIGH, then the Custom Code Bits--C4 and C5 would have the Value(0,0). Likewise, when pulled LOW, then C4 and C5 bits will be (1,1),The other Customs Code Bits,namely:C0~C3 and C6,C7 are fixed at (1,1,1,0) and (1,0 ): The waveform of bits are given below:
0.25/0.26ms
Bit "0"
1.00/1.05ms
Bit "1"
2.00/2.10ms
Note: Oscillator Frequency=480 or 455kHz
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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SC50462
6. KEY ON TIMING
When any key is pressed, the output pin-- OUT continuously generates the waveform described below until the key is released.
KEY ON 44ms/46.4ms OUT 1st Frame 2nd Frame n-th Frame
Note: Oscillator Frequency=480 or 455kHz
7. CARRIER WAVEFORM
The following is the carrier waveform diagram. A bit modulates 10 carrier waveforms.
10 pulses
1 Bit
Carrier Wave
1/3 Duty Cycle
a
3a
a= 8.3s/8.76s
Note: Oscillator Frequency=480 or 455kHz
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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TYPICAL APPLICATION CIRCUIT
SC50462
S8550 +3V 150 1 200pF 2 200pF 3 480kHz/ 455kHz 4 5 6 7 8 9 OSCO CNTR S1 S2 S3 S4 S5 C5 22 C4 21 I8 20 I7 19 I6 18 I5 17 I4 16 I3 15 I2 14 I1 13 OSCI OUT 23 150 Vss Vcc 24 LED Vcc 1 47F IR LED
10 S6 11 S7 12 S8
SC50462
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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CHIP TOPOGRAPHY
22 21 20 19 18 17
SC50462
16
15 23 14 24 13 1 12 2
11 10 3 4 5 6 7
2
8
9
size: 1.96 x 2.07mm
PAD COORDINATES (Unit: m)
No. Symbol X Y No. Symbol X Y
1 2 3 4 5 6 7 8 9 10 11 12
P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12
-904.75 -904.75 -904.75 -450.25 -200.25 80.75 220.75 501.75 641.75 906.00 906.00 906.00
-122.00 -258.25 -709.00 -851.25 -851.25 -851.25 -851.25 -851.25 -851.25 -615.50 -475.50 -194.50
13 14 15 16 17 18 19 20 21 22 23 24
P13 P14 P15 P16 P17 P18 P19 P20 P21 P22 P23 P24
906.00 906.00 906.00 906.00 739.00 530.50 322.00 113.50 -564.75 -773.25 -904.75 -857.00
54.50 154.00 362.50 571.00 854.75 854.75 854.75 854.75 854.75 854.75 248.00 12.00
Note: The original point of the coordinate is the die center.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
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PCB WIRE LAYOUT SCHEMATIC:
SC50462
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.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
10
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PACKAGE OUTLINE
SC50462
UNIT: mm
2.54 7.62(300) 0.25B 0.05 15 degree 4.36MAX 0.46B0.08 0.89MAX 3.00MIN
SDIP-24-300-2.54
6.4B
0.25
1.27 29.72B0.3
SOP-24-375-1.27
0.5 MIN
UNIT: mm
1.27 15.34B0.25 0.40B0.1
3.10MAX
13.97
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
11
0.25B
0.05
9.525(375)
10.2B 0.4 7.6B 0.3
Silan Semiconductors
Attach Revision History
Data
2001.11.08
SC50462
REV
2.0
Description
Modify the "Absolute maximum rating "
Page
2 8 10 11
2002.02.28
2.1
Modify the "Typical application circuit " Add the "PCB wire layout schematic" Modify the "Package outline"
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.1 2002-02-28
12

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