SC3010 데이터 시트보기 (PDF) - Silan Microelectronics

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SC3010

INFRARED REMOTE CONTROL TRANSMITTER OF RC5 CODE FORMAT

Silan Microelectronics 

SC3010

Both the DOUT and the MDOUT are non-conducting (3-state outputs) when in the quiescent state. The Scan

Driver Outputs (KO0~KO7) are open drain n-channel and conduct when the circuit is in the quiescent state.

4. SYSTEM MODES

a). Combined System Mode (SMS=Low)

The KI and the C Sense Inputs have p-channel pull-up transistors (meaning they are normally in HIGH state).

They are pulled to LOW state when an output is connected, to them as a result of a legal key operation. A legal

key operation in the KI-KO or C-KO Matrix will initiate a debounce cycle. Once key contact has been established

for 18-bit time without any interruption, the Oscillator Enable Signal is latched and the key may be released. The

device is reset when there is an interruption during the 18-bit time period. At the end of the debounce cycle, KO

Outputs are switched off and two scan cycles begins.

When KI or C Input senses a low level output, a Latch-Enable Signal is fed to the System (C-Input) or

Command (KI-Input) Latches. After latching a system number, the device will generate the last command (i.e. all

command bits logic 1) in the selected system for as long as the key is pressed. Latching of a command number

causes the chip to generate this command together with the system number stored in the system latch. By

releasing the key, the device will be reset if no data is to be transmitted at the time. The complete code frame is

transmitted even if the key is released during code transmission.

b). Single System Mode (SMS=High)

In the Single System Mode, the KI-Sense Inputs are also pulled High by the p-channel pull-up transistors, as in

the Combined System Mode. The C-Sense Inputs, however, are disabled by switching off their pull-high

transistors. A system code is provided by a wired connection between the C-KO Matrix. The debounce cycle can

ONLY be started by any legal key operation in the KI-KO Matrix. Once the key contact has been established for

18-bit time without any interruption, the Oscillator-Enable Signal is latched and the key may be released. Any

interruption during the 18-bit time period resets the internal action.

At the end of the debounce cycle, the pull-up transistors in the KI-Lines are then switched off and the pull-up

transistors in the C-lines are turned ON for the first scan cycle. The wired connection in the C-matrix matrix is

then translated into a system number and stored in the system latch. At the end of the first scan cycle, 1) the C-

Input pull-up transistors are switched off and the inputs are again disabled, 2) KI-Sense Input pull-up transistors

are turned on. The command number is generated by the second scan cycle. This command number is then

latched and transmitted together with the system number.

5. KEY RELEASE DETECTION

An additional control bit is complemented after key release. This additional control bit tells the decoder that the

next code is a new command. This feature is important in cases where more digits are needed to be inputted (i.e.

Teletext channel numbers or Viewdata pages). The extra control bit will only be complemented after the

completion of at least one code transmission. The scan cycles are repeated before every code transmission; thus,

even with the Take Over of key operation during the code transmission, the correct system and command

numbers are generated.

6. RESETTING THE DEVICE

The device will immediately reset under the following conditions:

1). A key is released during the debounce time

2). A key is released between two codes

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Http: www.silan.com.cn

REV:2.2 2005.12.15

Page 5 of 15

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