SC5272

a

4a

12a

12a

4a

32a

OSC

bit "0"

bit "1"

bit "f"

Where: a = oscillating clock period .

Bit “ f ” is only available for address bits.

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

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 interpreted as either address or data bits depending on the SC5272 version used. Please

refer to the diagram below:

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

SYNC

Single Resistor Oscillator

The Build-in oscillator circuitry of SC5272 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. It is a good practice to center

the SC5272 oscillator frequency in the window to gain best window margin at both sides. The typical oscillator

frequency with various resistor values for both SC5262 and SC5272 are shown below:

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.2

2008.02.22

Http://www.silan.com.cn

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