SC3010

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:2.2

2005.12.15

Http: www.silan.com.cn

Page 4 of 15

connection of one C-Input(C0~C3) to one K-Output (KO0~KO7) when the System Mode Selection (SMS) Pin is in

a LOW state. If the SMS is in a HIGH state, then a wired connection must be made between a C-Input to a K-

Output in order to generate the system number. For connections consisting of one K-Input or C-Input to more

than one K-Output Pins, the last scan signal is recognized as LEGAL.

b). Illegal Key Input

An illegal key input operation does not produce any activity. No activity will be generated if 1) two or more K-

Input/C-Input Pins or 2) C-Input and K-Input Pins are activated simultaneously. The oscillator will not start. Thus,

this operation is considered as ILLEGAL.

2. INPUTS: KI0~KI7 & C0~C3

In the quiescent state, the command inputs KI0~KI7 are pulled HIGH by an internal pull-up transistor. Also if

the system is quiescent and the System Mode Selection Input (SMS) is in High state so that current flow may be

prevented. A wired connection in the C-KO Matrix provides 32 systems.

3. DATA OUTPUT

Debounce Time

(16-Bit Time)

Scan

Time

(2-Bit Time)

Start Bit

Control

Bit

System Bits

Command Bits

LSB

LSB MSB

One Code

First Code

Second Code

Repetition Time

MSB

Where: debounce time+ scan time=18 bit-times, Repetition time=4x16 bit-times

Figure 1: Data Output Format

The generated information is transmitted through the output signal DOUT. The Data Output Code consists of

1.5 Start Bits (2xLogic 1), 1 Control Bit, 5 System Bits, and 6 Command Bits. Please refer to the diagram above

for the data output format. (See also Command and System Matrixes).

After a legal key operation is performed, the KO outputs are switched off and a 16-bit debounce time period is

experienced followed by a 2-bit scan cycle time. During the scanning cycle the outputs are switched to the

conductive state one at a time.

Code is transmitted using a biphase technique. Please refer to the diagram below. The MDOUT Output Signal

transmits the generated data modulated by 1/12 of the oscillator frequency with a 25% duty factor.

Logic 1

Logic 0

where: 1 bit-time=3x2

Figure 2: Biphase Code Transmission Technique