SC2128A-C82D データシートの表示（PDF） - Silan Microelectronics

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SC2128A-C82D

REMOTE FAN CONTROL IC

Silan Microelectronics 

Silan

Semiconductors

SC2128A

the final adjustments, regardless the adjustments are made from panel key or from remote control handset. One

exception is the SLEEP key available on the remote control handset. SLEEP key start or adjusts the fan to the

default sleep settings. Regardless the fan is started by SPEED or by MEMS, SLEEP key does not affect the

operation memory.

14. BUZZER OUTPUT

All valid key pressed except OFF/MEMS initiates a 150ms

duration 4kHz 50% duty cycle pulse train at OFF/MEMS/BUZZ

pin. OFF/MEMS key function as OFF key if pressed when fan is

in any on state. In this case, it does NOT initiate an output on

BUZZ. OFF/MEMS key functions as MEMORY-START key if

pressed when fan is in off state. In this case, it DOES initiate a

150ms duration 4kHz 50% duty cycle pulse train on BUZZ. Note

that when OFF/ MEMS/BUZZ outputs the pulse train, key input

is suppressed. That is, pressing OFF/MEMS key when the

buzzer is buzzing is NOT recognized by SC2128A. The

diagram right shows the buzzer connection.

VDD

SC2128A

OFF/MEMS/

BUZZ

VSS

OFF/MEMS key

-5V

15. REMOTE CONTROL DECODER

SC2128A is designed to be used together with SC2268 infrared ray remote control encoder. Such combination

allows up to 8 remote control keys – SPEED, MODE, TIMER, LIGHT, SLEEP, SW1, SW2, OFF/MEMS – to be

built on the remote control handset. 4 bits customer code, b3 ~ b6, is encoded by SC2268 and decoded by

SC2128A in order to avoid remote control contention between devices. With SC2268, b3 is determined by

bonding option; b4, b5 and b6 are determined by connecting respective c4, c5, c6 pin to VDD or VSS. With

SC2128A, b3 and b6 can be mask programmed upon customer request and with NRE.

The remote control signal coding scheme is fully

compatible with SC2268. Some description follows.

Please refer to specification of SC2268 for details.

When SC2128A receives a remote control signal at

its REMOTE pin, it decodes the received waveform

into consecutive “0” bits and “1” bits. It first

compares the received start word against its

customer code. If and only if the start word matches

the customer code, it then compares for two

consecutive and matched code words. It then

actuates the command according to the code words

table shown later.

Code bit:

"0" bit:

"1" bit:

0.625ms

1.875ms

2.5ms

Start/Code word:

b0 b1 b2 b3 b4 b5 b6 b7

Code frame

start word 1st code word 2nd code word

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

11

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