Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

REMOTE CONTROL ENCODER

DESCRIPTION

The SC5262 is a remote control encoder paired with SC5272

utilizing CMOS technology. It encodes data and address pins into a
serial coded waveform suitable for RF or IR modulation. SC5262
has a maximum of 12-bits of tri-state address pins providing up to
531,441(or 3

) address codes; thereby, drastically reducing any

code collision and unauthorized code scanning possibilities.

FEATURES

* Low power consumption and very high noise immunity
* Up to 12 tri-state code address pins or 6 data pins
* Wide operating voltage range(Vcc=3V ~ 15V)
* Single resistor oscillator
* Latch or Momentary output type

APPLICATION

* Home/automation security system
* Remote control toys or for industrial use
* Remote control fan
* Garage door controller

DIP-20

DIP-18

SOP-20

ORDERING INFORMATION

SC5262X-XX

RF: RF Applicatant, normally omitted
IR: IR Applicatant

S: SOP-20 Package
D: DIP-20 Package
Omitted: DIP-18 Package

PIN CONFIGURATION

Vss

Vcc

Dout

OSC1

OSC2

A11/D0

5262

18 Pin

Package

20 Pin

Package

A10/D1

A9/D2

A8/D3

A6/D5

A7/D4

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

BLOCK DIAGRAM

System

Timing

Control

Logic

Code

Generation

Address

OSC

A6/

A7/

A8/

A9/

A10/

A11/

Vss

Vcc

Dout

OSC1

OSC2

The block diagram is for DIP-18(hereinafter is the same)

ABSOLUTE MAXIMUM RATINGS

(Ta=25

C )

Characteristic

Symbol

Value

Unit

Supply Voltage

Vcc

-0.3 ~ 16.0

Input Voltage

-0.3 ~ Vcc+0.3

Output Voltage

-0.3 ~ Vcc+0.3

Maximum Power Dissipation(Vcc=12V)

300

Operating Temperature

Topr

-20 ~ +70

Storage Temperature

Tstg

-40 ~ +125

ELECTRICAL CHARACTERISTICS

(Ta=25

C,Vcc=12V,unless otherwise specified)

Characteristic

Symbol

Test Condition

Min

Typ.

Max

Unit

Supply Voltage

Vcc

Supply Current

Icc

Vcc=12V,OSC stops

A0~ A11 Open

0.02

0.3

Vcc=5V,V

=3V

-3

Dout Output driving Current

Vcc=8V,V

=4V

-6

Vcc=12V,V

=6V

-10

Vcc=5V,V

=3V

Dout Output sinking Current

Vcc=8V,V

=4V

Vcc=12V,V

=6V

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

PIN DESCRIPTION

Pin No.

18 PIN

20 PIN

Pin Name

I/O

Description

1~6

A0~A5

Code Address pins No. 0~5. These six tri-state pins are
detected by SC5262 to determine the encoded waveform
bit 0 ~bit 5. Each pin can be set to "0","1","f"(floating).

7~8

10~13

7~8

12~15

A6/D5~A11/D0

Code Address pinsNo.6~11/data pins No.5~0. These six
tri-state pins are detected by SC5262 to determine the
encoded waveform bit 6 ~bit 11.When these pins are used
as address pins, they can be set to "0","1","f".When they
are used as data pins ,they can be set only to "0","1".

Transmission Enable. Active Low Signal.SC5262 outputs
the encoded waveform to DOUT when this pins is pulled to
LOW.

OSC1

Oscillator Pin No.1

OSC2

Oscillator Pin No.2

A resistor connected between
these two pins determine the
fundamental frequency of SC5262.

DOUT

Data Output Pin. The encoded waveform is serially
outputted to this pin. When SC5262 is not transmitting,
DOUT outputs low(Vss) voltage.

Vcc

Positive Power Supply

Vss

Negative Power Supply

10~11

Not Connected

FUNCTIONAL DESCRIPTION

The SC5262 encodes the code address and data set at A0~ A5 and A6/D5 ~ A11/D0 into a special waveform

and outputs it to the Dout when TE is pulled to "0" (Low state). This waveform is fed to either the RF modulator or
the IR transmitter for transmission. The Transmitted radio frequency or infrared ray is received by the RF
demodulator or IR receiver and reshaped to the special waveform. SC5272 is then used to decode the waveform
and set the corresponding output pins. Thus completing a remote control encoding and decoding function.

1. RF OPERATION

Code Bits

A code bit is the basic component of the encoded waveform, and can be classified as either an AD(Address/Data)

Bit or a SYNC(Synchronous) Bit.

An AD bit can be designated as bit " 0 ", " 1 " or " f " if it is in low, high or floating state respectively. One bit

waveform consists of two pulse cycles. Each pulse cycle has 16 oscillating time periods. For further details, please
refer to the diagram below:

The Synchronous bit waveform is 4 bits long with 1/8 bit width pulse. Please refer to the diagram below:

1/8 bit width=4a

4 bit width=128a

Note: 1bit =32a

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

Code word

A group of Code Bits is called a Code Word. A Code Word consists of 12 AD bits followed by one Sync. Bit. The

12 AD bits are determined by the corresponding states of A0~A5 and A6/D5 ~ A11/D0 pins at the time of
transmission. When Data Type of SC5262 is used , the address bits will decrease accordingly. For example, in the
3 Data Type where the address has 9 bits, the transmitting format is:

9 address bits

3 Data bits

Sync. Bit

SC5262/SC5272 has a maximum of 12 Address Bits including the 6 Address/Data bits. The following diagram

shows the code bits with their corresponding pins.

/D5

/D4

/D3

/D2

A10

/D1

A11

/D0

0 Data

A10

A11

Sync

1 Data

A10

Sync

2 Data

Sync

3 Data

Sync

4 Data

Sync

5 Data

Sync

6 Data

Sync

The Code Bits A0~A5 and A6/D5 ~ A11/D0 are determined by the states of A0 ~ A5 and A6/D5 ~A11/D0 pins.

For example, when the A0(pin 1) is set to " 1 "(Vcc), the code bit A0 is synthesized as " 1 " bit. In the same manner,
when it (A0 pin) is set to " 0 "( Vss) or left floating, the Code Bit A0 is synthesized as a " 0 " or " f " bit respectively.

Code Frame

A Code Frame consists of 4 continuous code Words. When SC5262 detects "0" on the TE (meaning , the TE

is active "low"), it outputs a Code frame at Dout. If TE is still active at the time the Code Frame transmission ends.
SC5262 outputs another Code Frame. It should be noted that the Code Frame is synthesized at the time of
transmission.

Dout

1 frame(=4 word)

1 frame

Single Resistor Oscillator

The Build-in oscillator circuitry of SC5262 allows a precision oscillator to be constructed by connecting an

external resistor between OSC1 and OSC2 pins. For SC5272 to decode correctly the received waveform, the
oscillator frequency of SC5272 must be 2.5 ~8 times that of transmitting SC5262. The typical oscillator frequency
with various resistor values for both SC5262 and SC5272 are shown below:

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

100

Supply Voltage (V)

r
equenc

(
k

)

Encoder OSC Frequency

1000

Supply Voltage (V)

r
equenc

(
k

)

Decoder OSC Frequency

100

R=510k

R=1M

R=3.3M

R=4.7M

R=100k

R=240k

R=510k

R=1M

R=2M

Suggested Oscillator resistor values are shown below:

4.7M

820k

3.3M

1.2M

680k

200k

SC5262

SC5272

2. IR OPERATION

In the IR Type of operation, the functions are similar to the above descriptions except for the output waveform

that has a carrier frequency of 38kHz. Details are as follow.

Code Bits

The Code Bits are further modulated with a 38kHz carrier frequency and can be"0","1" or " f " bit. Their waveform

are shown below:

OSC

"0"

"1"

"f"

Sync

160

Note:

=2 clock lengths

620

Code Word

A Code Word is made up of code bits and the format is the same as that of the RF Code Word.

Code Frame

Likewise, a Code Frame is made up of Code Words and the format is the same as that of RF type of operation.

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

Oscillator

The oscillator frequency for the IR type of operation is twice the carrier frequency. Thus, the oscillator frequency

should be kept at 76kHz. A 430k~470k

oscillator resistor between OSC1 and OSC2 pins is recommended. It

should be noted that the carrier is a 50% duty cycle frequency.

OPERATION FLOW CHART

Power ON

Stand-by

Mode

TE Enable?

4 Words of

Address/Data

transmitted

Yes

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

TYPICAL APPLICATION CIRCUIT

10k ×4

×4

1N4148×4

4.7M

4.7k

5pF

25pF

LED

MPSH10

SW0

SW1

SW2

SW3

+12V

SC5262

UHF Band 4 Data Transmitter Circuit is recommended.

4.7M

4.7k

5pF

25pF

LED

MPSH10

+12V

SC5262

UHF Band Address-only(o data) Transmitter Circuit is recommended.

Silan
Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

4.7M

4.7k

5pF

25pF

LED

MPSH10

+12V

SC5262

UHF Band Address-only(o data) Zero-stand-by Transmitter Circuit is recommended.

2.7k ×4

2.7k

1N4148×4

430k

~ 470k

SW0

SW1

SW2

SW3

+4.5V

2.7k

1N4148

SW4

SW5

4.7

2SC1815×2

Rosc

SC5262-IR

Infrared Ray 6-data circuit. Adjust Rosc to get 38kHz carrier pulse at Dout pin is recommended.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SC5262S-IR

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SC5262S-IR