sc2268-00 Silan, sc2268-00 Datasheet - Page 3

• Manufacturer Part Number: sc2268-00
• Description: Fan Remote Control Encoder
• Manufacturer: Silan

PIN DESCRIPTION
FUNCTIONAL DESCRIPTION
2. OSCILLATOR
3. TRANMISSION WAVEFORM
words and a space. The code will be continuously outputted until the key is released. If for any reason, the key
was released during the code transmission process, the code that is being transmitted during the key release
action will still be completely outputted. Please refer to the following diagram.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
1.KEY INPUT
Please refer to the diagram right.
about 60K ~ 110K
components.
inverter and Built-in Feedback resistor, 455kHz crystal and
two 220pf capacitors. The carrier frequency is 38kHz.
oscillation
consumption is considerably reduced.
When any of the 8 keys (I1 ~ I8) is set to “ High” , the TxOUT outputs one start word followed by 2 identical data
Pin No.
Up to eight keys can be directly connected to pins I1 ~ I8.
Furthermore, SC2268 has a buit-in pull-low resistor of
An oscillation circuit can be constructed using the CMOS
Unless any of the 8 keys (I1~I8) is being operated, the
11~12
1~8
10
13
15
14
16
9
is
Symbol
TxOUT
C4~C5
OSCO
I1 ~ I8
automatically
OSCI
Vss
Vcc
C6
which reduces the need for external
Key input pins.
These pins are used to connect a maximum of 8 keys.
(each pin has a built-in pull-low resistor).
Negative power supply.
Select input pin for start word.
These pins have internal pull-low resistor.
Select input pin for start word.
This pins have internal pull-high resistor.
Transmission output pin.
This pin is an open drain (NMOS) output and is used to transmit signals. The
carrier frequency is 38kHz.
Oscillator Input Pin
Oscillator Outpu Pin
Positive power supply.
stopped.
Thus,
power
These pins are used to externally connect a 455kHz
ceramic resonator.
Function
Vcc
220pf
OSCI
15
SC2268
455kHz
REV: 1.0
1
2
3
4
5
6
7
8
OSCO
I1
I2
I3
I4
I5
I6
I8
I7
14
SC2268
220pf
SC2268
Page 3 of 7
2004.08.03