Datasheet SC50462, SC50462S Datasheet (SILAN)

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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.

FEATURES

* High performance CMOS technology
* Low power consumption
* Least external components.
* Up to 76 instructions
* Double key operation is possible.

APPLICATIONS

* Television remote control transmitter
* Video cassette recorder(VCR) remote control transmitter

BLOCK DIAGRAM

VccVss

SC50462

SDIP-24

SOP-24

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ORDERING INFORMATION

SC50462
SC50462S

C4C5
2122241

SDIP-24 Package
SOP-24 Package

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I1

13

I2

14

I3

15

I4

16

Key

I5
I6
I7
I7

Encoder

17
18
19
20

Scan Signal Generating Circuit

75 6 8 9 10 11 12 2 3

S1 S2 S3 S4 S5 S6 S7 S8 OSCI OSCO

Instruction

Decoder

Timing

Generator

Code

Modulator

Output

Buffer

Oscillation

Circuit

CNTR

4

OUT

23

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PIN CONFIGURATION

1

Vss

OSCI

2
3

OSCO

4

CNTR

S1

5

S2

6

SC50462

S3

7

S4

8

S5

9

S6

10

S7

11

S8 I1

12 13

24

Vcc
OUT

23
22

C5

21

C4
I8

20

I7

19

I6

18

I5

17

I4

16

I3

15

I2

14

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ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Value Unit

Supply Voltage V
Input Voltage V
Output Voltage V
PowerDissipation P
Operating Temperature Topr -10 ~ +70
Storage Temperature Tstg -40 ~ +125

(Ta=25°C)

CC

IN

OUT

D

-0.3 ~ 5.5 V

Vss-0.3V ~ VCC+0.3V V

Vss ~ V

300 mW

ELECTRICAL CHARACTERISTICS

Parameter Symbol Test Conditions Min Typ Max Unit

Operating Supply Voltage V
Operating Supply Current I
Stand-by Current I
Pull-Up Resistor(I1~I8) Rup 100 250 400
Pull-Up Resistor(4C,5C)

Output Current(S1~S8) I
High level Output Current(

Low level Output Current(
High level Output Current(
Low level Output Current(

OUT

OUT

CNTR

CNTR

Rup 200 350 500

)

)

)

)

(Tamb=25°CVCC=3.0V,Vss=0,Unless otherwise specified)

Ta=20 ~ 70°C
Fosc=455kHz 0.3 mA

VOL=1.2V -0.2 mA

VOH=2V 5 mA
VOL=1V -3 mA
VOH=2V 1 mA
VOL=1V -3 mA

CC1

CC2

I
I
I
I

CC

OL

OH

OL

OH

OL

SC50462

CC

1.5 3 5 V

V

°C
°C

1

µA
kΩ
kΩ

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PIN DESCRIPTION

Pin No. Pin Name Input/output Description

1,24 Vss,Vcc Power Power Supply: Vcc=3.0V,Vss=0V

2,3 OSCI,OSCO I/O

4

5~12 S1~S8 O Key Scan Signal Output pins.

13~20 I1~I8 I Key Scan Signal Input pins.

21,22

23

CNTR

,

C4 C5

OUT

O

I Custom Code

O Modulation Pin

Oscillator Input/Output Pin, 455 or 480kHz Crystal is connected
between these pins.
Transmitting Indicator. An LED and resistor are connected from
thispintoVcc.

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--

and5C--setting before finally sending out the remote control signal.

4C

1.

LED lights up. The

OUTPUT

CNTR

The CNTR Pin is the LED transmission Indicator. This means that Whenever a valid transmission is sent, the

CNTR output becomes “L” in the 7

th

pulse-rising and “H” in the 17thpulse-rising.

SC50462

OUT

C0 C1 C2 C3 C4 C5 C7 D0 D1 D2 D3 D4 D5 D6 D7C6

CNTR

Note: Oscillator Frequency=480 or 455kHz

7th 17th

One Word

44ms or 46.4ms

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2. OSCILLATING CIRCUIT

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

2 3

480kHz/

455kHz

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:

SC50462

I8 I7 I6 I5 I4 I3 I2 I1

S1
S2
S3
S4
S5
S6
S7
S8

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

SW11

SW12

SW13

SW25

SW26

SW27

SW28

Note:

SC50462 permits two keys
function but only “
allowed.

When you push one key of
SW11/12/13, you can push with
another key of SW25/26/27/28.
Otherwise, other conditions are
illegal.

” key are

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4. TRANSMISSION CODE

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.

SC50462

Scan Output

S1 0 0 0 0
S2 1 0 0 1
S3 0 1 0 2
S4 1 1 0 3
S5 0 0 1 4
S6 1 0 1 5
S7 0 1 1 6
S8 1 1 1 7

Key Input

I1 0 0 0 0
I2 1 0 0 1
I3 0 1 0 2
I4 1 1 0 3
I5 0 0 1 4
I6 1 0 1 5
I7 0 1 1 6
I8 1 1 1 7

D0 D1 D2

D3 D4 D5

Table 1: Key Matrix/Code

Data

Data

Octal display

Octal display

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Scan Output

S5/I2(SW25) 00110010 4 1 1

S1/I1

(SW11)

S2/I1

(SW12)

S3/I1

(SW13)

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
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:

S6/I2(SW26) 10110010 5 1 1
S7/I2(SW27) 01110010 6 1 1
S8/I2(SW28) 11110010 7 1 1
S5/I2(SW25) 00110001 4 1 2
S6/I2(SW26) 10110001 5 1 2
S7/I2(SW27) 01110001 6 1 2
S8/I2(SW28) 11110001 7 1 2
S5/I2(SW25) 00110011 4 1 3
S6/I2(SW26) 10110011 5 1 3
S7/I2(SW27) 01110011 6 1 3
S8/I2(SW28) 11110011 7 1 3

4C and 5C Terminals. The 4C and 5C pins are inversed; therefore, if the 4C and 5C terminals are

D0 D1 D2 D3 D4 D5 D6 D7 D0~D2 D3~D5 D6~D7

Table 2: Double Key Signal/Code

Data Code Octal Display

SC50462

0.25/0.26ms

Bit "0"

1.00/1.05ms

Bit "1"

2.00/2.10ms

Note: Oscillator Frequency=480 or 455kHz

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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

Note: Oscillator Frequency=480 or 455kHz

7. CARRIER WAVEFORM

The following is the carrier waveform diagram. A bit modulates 10 carrier waveforms.

10

1Bit

pulses

SC50462

n-th

Frame

Carrier

Wave

1/3 Duty Cycle

a3a

a= 8.3µs/8.76µs

Note: Oscillator Frequency=480 or 455kHz

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TYPICAL APPLICATION CIRCUIT

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200pF

+3V

200pF

480kHz/
455kHz

150

SC50462

S8550

1

¡

Vcc

C5

C4

Vcc

24

23

22

21

20

I8

47F

150

IR

LED

¡

LED

¡

1

Vss

2

OSCI

3

OSCO

4

CNTR

5

S1

OUT

S2

6

S3

7

S4

8

S5

9

S6

10

S7

11

S8 I1

12 13

I7

19

I6

18

I5

17

I4

16

I3

15

I2

14

SC50462

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CHIP TOPOGRAPHY

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SC50462

22 21 20 19 18

23

24
1
2

3

54

17

16

15

14

13

12

11

10

9876

size: 1.96 x 2.07mm2

PAD COORDINATES

No. Symbol X Y No. Symbol X Y

(Unit: µm)

1 P1 -904.75 -122.00 13 P13 906.00 54.50
2 P2 -904.75 -258.25 14 P14 906.00 154.00
3 P3 -904.75 -709.00 15 P15 906.00 362.50
4 P4 -450.25 -851.25 16 P16 906.00 571.00
5 P5 -200.25 -851.25 17 P17 739.00 854.75
6 P6 80.75 -851.25 18 P18 530.50 854.75
7 P7 220.75 -851.25 19 P19 322.00 854.75
8 P8 501.75 -851.25 20 P20 113.50 854.75

9 P9 641.75 -851.25 21 P21 -564.75 854.75
10 P10 906.00 -615.50 22 P22 -773.25 854.75
11 P11 906.00 -475.50 23 P23 -904.75 248.00
12 P12 906.00 -194.50 24 P24 -857.00 12.00

Note: The original point of the coordinate is the die center.

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PCB WIRE LAYOUT SCHEMATIC:

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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:

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* 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.

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* The emitter of triode connect 1

resistor at least.

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PACKAGE OUTLINE

SDIP-24-300-2.54 UNIT: mm

2.54

0.25

B

6.4

SC50462

7.62(300)

0.05

B

0.25

29.72B0.3

0.5 MIN

0.46B0.08

1.27

4.36MAX3.00MIN

0.89MAX

15 degree

SOP-24-375-1.27 UNIT: mm

0.3

0.4

B

B

7.6

1.27

15.34B0.25

0.40

10.2

B

0.1

3.10MAX

9.525(375)

0.05

B

0.25

13.97

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Attach

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SC50462

Revision History

Data REV Description Page

2001.11.08 2.0
Modify the “Absolute maximum rating “

2002.02.28 2.1

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Modify the “Typical application circuit “
Add the “PCB wire layout schematic”
Modify the “Package outline”

2

8
10
11

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