Silan

Semiconductors

SC5262

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

4

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.

A0

A1

A2

A3

A4

A5

A6

/D5

A7

/D4

A8

/D3

A9

/D2

A10

/D1

A11

/D0

0 Data

A0A1

A2

A3

A4A5A6A7A8A9

A10

A11

Sync

1 Data

A0A1

A2

A3

A4A5A6A7A8A9

A10

D0

Sync

2 Data

A0A1

A2

A3

A4A5A6A7A8A9

D1

D0

Sync

3 Data

A0A1

A2

A3

A4A5A6A7A8D2

D1

D0

Sync

4 Data

A0A1

A2

A3

A4A5A6A7D3

D2

D1

D0

Sync

5 Data

A0A1

A2

A3

A4A5A6D4

D3

D2

D1

D0

Sync

6 Data

A0A1

A2

A3

A4A5D5

D4

D3

D2

D1

D0

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.

TE

Dout

1 frame(=4 word)

1frame

1frame

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: