Silan

Semiconductors

SC3010

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.1

2002-02-28

4

FUNCTIONAL DESCRIPTION

1. KEY INPUT OPERATION

A Key Input Operation may be considered legal or illegal depending on the keys pressed. For key interconnection

refer to the application circuit diagram in APPLICATION CIRCUIT SECTION. The maximum value of the switched

key contact series resistance is 7k

Ω.

a). Legal Key Input

A legal key input operation enables the device to activate the corresponding codes. A key input operation is

considered as legal if it is 1). a connection of one K-Input (KI0~KI7) to one K-Output (KO0~KO7), or 2).a 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