Silan

Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

3

PIN DESCRIPTION

Pin No.

18 PIN

20 PIN

Pin Name

I/O

Description

1~6

1~6

A0~A5

I

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

I

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”.

14

16

TE

I

Transmission Enable. Active Low Signal.SC5262 outputs

the encoded waveform to DOUT when this pins is pulled to

LOW.

15

17

OSC1

O

Oscillator Pin No.1

16

18

OSC2

I

Oscillator Pin No.2

A resistor connected between

these two pins determine the

fundamental frequency of SC5262.

17

19

DOUT

O

Data Output Pin. The encoded waveform is serially

outputted to this pin. When SC5262 is not transmitting,

DOUT outputs low(Vss) voltage.

18

20

Vcc

--

Positive Power Supply

9

9

Vss

--

Negative Power Supply

--

10~11

NC

--

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