Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

REMOTE CONTROL ENCODER

DESCRIPTION

The SC5260 is a remote control encoder paired with either

SC5260 or SC5272 utilizing COMS Technology. It encodes data and

address pins into a serial coded waveform suitable for RF

modulation. SC5260 has a maximum of 10 bits tri-state address

pins providing up to 59,049 (or 310) address codes; thereby,

drastically reducing any code collision and unauthorized code

scanning possibilities.

S C 5 2 6 0 i s o n e o f t h e f i r s t g e n e r a t i o n o f E n c o d e r /

Decoder ICs. When paired with SC5270, this encoder/decoder

(SC5260/SC5270) pair can operate at very wide temperature range

(see Features). Thus, this very important feature enables your

Encoder/Decoder

operate

under

the

worst

environmental

condition.

FEATURES

* High Performance Technology

* Low Power Consumption

* Very High Noise Immunity

* Wide Operating Temperature Range: -30

C ~ 70

* 8 or 10 Tri-State Code Address Pins

* Single Resistor Oscillator

* Least External Components

DIP-16

SOP-16

APPLICATIONS

* Home/Car Security System

* Garage Door Controller

* Remote Fan Controller

* Remote Control Toys

ODERING INFORMATION

SC5260-R4 (S)

16 Pins, DIP (SO)

SC5260-R2 (S)

16 Pins, DIP (SO)

Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

BLOCK DIAGRAM

ADDRESS

/DATA

SYSTEM

TIMING

CONTROL

LOGIC

CODE

GENERATION

OSC

DOUT

A8/D3

A9/D2

PIN CONFIGURATION

DOUT

OSC

SC5

260-R4

DOUT

OSC

SC5

260-R2

ABSOLUTE MAXIMUM RATINGS

Characteristic

Symbol

Value

Unit

Supply Voltage

-0.3 ~ +6.0

Input/Output Voltage

OUT

-0.3V ~ V

+0.3V

Maximum Power Dissipation

500

Operating Temperature

Topr

-30 ~ +70

Storage Temperature

Tstg

-40 ~+125

Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

ELECTRICAL CHARACTERISTICS

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Supply Voltage

1.8

6.0

Stand-by Current

=3V OSC stops

All input pins open

0.2

0.5

0.8

DOUT Output Driving Current

=3V, V

=1.5V

=6.0V, V

=3.0V

2.5

DOUT Output Sinking Current

=3V, V

=1.5V

=6.0V, V

=3.0V

4.6

Operation Current

Iop

=1.8V

=6.0V

0.01

0.50

PIN DESCRIPTION

Pin No.

Symbol

I/O

Description

1~8

A0~A7

Code Address Pin Nos.0~7

These eight tri-state pins ate detected by SC5260 to determine the

encoded waveform bit0~bit7. Each bit can be set to "0", "1", or

"f"(floating).

10~11

A8/D3~A9/D2

I/PL*

Code Address pin Nos.8~9/Data Pin Nos.3~2.

These two tri-state pins are detected by SC5260 to determine the

encoded waveform bit8~bit9. When these pins ate used as address

pins (as in SC5260-R2), they can be set to "0", "1", or "f" (floating).

When these pins are used as data pins (as in SC5260-R4), they can

only be set to "0" or "1".

12~13

D1, D0

I/PL

Data Pin Nos. 1~0. These pins can only be set to "0" or "1".

OSC

Oscillator Pin A resistor connected between the OSC Pin and the VCC

determines the fundamental frequency of the SC5260.

DOUT

Data Output Pin. The encoded waveform is serially outputted to this

pin. When SC5260 is not transmitting, DOUT outputs low (VSS)

voltage.

VCC

Positive Power Supply

VSS

Negative Power Supply

Note: PL -- Pull-low Resistor is connected internally

PL* -- If those two pins are used as Data Pins (SC5260-R2), pull-low resistor is connected internally;

otherwise, no pull-low resistor is connected.

Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

FUNCTIONAL DESCRIPTION

SC5260 encodes the code address and data set at A0~A7, A8/D3, A9/D2, D1 and D0 into a special waveform

and outputs it to the DOUT when any of the data pins is tied to high. This waveform is fed to the RF Modulator for

transmission. The transmitted radio frequency is received by the RF demodulator and reshaped into the special

waveform. SC5270 (or SC5272) is then used to decode the waveform and set the corresponding output pin(s).

Thus completing a remote control encoding and decoding function.

1. RF Operation

1) Code Bits

A Code Bits is the basic component of the encoded waveform, and can be classified as either an

(Address/Data) Bit or a SYNC (Synchronous) Bit.

Address/Data (AD) Bit Waveform

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 2 pulse cycles. Each pulse cycle has 512 oscillating clock periods. For further details, please

refer to the diagram below:

1 bit = 1024

128

Osc

Bit "0"

Bit "1"

Bit "f"

Floating

384

128

Where:

= Oscillating Clock Period

Synchronous (SYNC.) Bit Waveform

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

1/8 bit width = 128

4 bit width = 4096

Note: 1 bit = 1024

Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

2) 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~A7, A8/D3, A9/D2, D1 and D0 pins at the time of

transmission. When the Data Type of SC5260 is used, the address bits will decrease accordingly.

For example: In the 4-Data Type where the address has eight (8) bits, the transmitting format is:

8 Address Bits

4 Data Bits

Sync. Bit

SC5260 has a maximum of ten (10) Address Bits. The following diagram shows the code bits with their

corresponding pins.

A8/

A9/

SYNC BIT

First Bit Transmitted

One Complete Code Word

2 Data:

Sync Bit

4 Data:

Sync Bit

The Code Bits A0~A7, A8/D3, A9/D2, D1 and D0 are determined by the states set at these pins. For example,

when the A0 (Pin No.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.

When SC5260 detects "1" on any of the Data Pins, it outputs a Code Word at DOUT. If the Data Pin is still in

high state ("1") the time the Code Word transmission ends, SC5260 outputs the same Code Word. Please refer

to the diagram below:

1 Code Word

1 Code Word 1 Code Word 1 Code Word

DATA PIN

DOUT

Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

3) Single Resistor Oscillator

The built-in oscillator circuitry of SC5260 allows a precision oscillator to be constructed by connecting an external

resistor between OSC and VCC pins. For SC5270 (or SC5272) to decode correctly the received waveform, the

oscillator frequency of SC5270 (or SC5272) must be 1/16~4 (or 1/16~1/4) times that of the transmitting SC5260.

The typical oscillator frequency of SC5270, and SC5272 are shown below:

Encoder (SC5260) OSC Frequency

Decoder (SC5270) OSC Frequency

400

300

250

200

100

500

Voltage (Volts)

r
eq

uen

(
K

)

R=820K

R=1M

R=2M

Voltage (Vcc)

100

120

140

160

180

r
equen

(KH

)

OSC Resistor = 510K Ohms

OSC Resistor = 1.0M Ohms

OSC Resistor = 1.2M Ohms

OSC Resistor = 2.2M Ohms

Decoder (SC5272) OSC Frequency

1000

100

Voltage

eque

ncy

(
K

)

R=100K

R=240K

R=510K

R=1M

R=2M

Suggested oscillator resistor values are shown below.

SC5260

SC5270

SC5272

820k

510k

620k

1.2M

2.2M

Silan
Semiconductors

SC5260

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

OPERATION FLOWCHART

Power ON

Stand-by Mode

Data Pin(s)

in HIGH State

1 Word of Address

/Data Transmitted

Data Pin(s) still

in HIGH State

YES

APPLICATION CIRCUIT

820K

47K

Vcc

SC5260-R4

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SC5260