Silan
Semiconductors
REMOTE FAN CONTROL IC
DESCRIPTION
The SC2128C is a high performance electronic fan controller LSI,
Speed control, off-timer, rhythm wind, sleep mode, head swing
and/or light control are all built into a single chip. Indicator LED
output, buzzer output, key control input, as well as remote control
decoding circuitry are all provided to build a full function electronic
fan with remote control capability having the highest performance
with the least external components. Pin assignment and application
circuit are optimized for easy PCB layout and cost saving for
electronic fan application.
SC2128C
FEATURES
* High performance CMOS Technology
* Low power consumption
* Optional independent light control
* 90 seconds cycle/6 seconds per step(off step 3 seconds) rhythm
wind pattern
* Built-in remote control decoding circuitry with mask option
custom code
* Available in 16,18,20,22,24 pin package for none, one set or two
sets of swing head and/or light control
* Two sets of swing head and/or light control
* Three operation modes: ordinary, rhythm and rhythm sleep.
DIP-24-300-2.54
APPLICATIONS
* Optimized for fan application
* Suitable for heater fan, cooling fan,
and other home appliances with remote
control, timer and/or output level control
PIN CONFIGURATION
NC
REMOTE
V
SS
OSCI
OSCO
V
DD
OFF/BUZZ
SPEED
MODE
1
2
3
4
5
6
7
8
9
24 SO2
23 LO
22 MI
21 ST
20 LED1
SC2128C
19 LED2
18 LED3
17 COM
16 TIMER
15 SO1
14 LIT
13 LORD
SW1 10
LIGHT 11
NC 12
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2001.09.26
1
Silan
Semiconductors
ORDERING INFORMATION
SC2128C
SC2128C- X X X X
S = Swing Head Output(s) Controlled by a Single Key (Mask
Option) Swing Head Outputs Controlled by Double Keys (D can be
D = Two
omitted)
0 = No Swing head Output
1 = 1 Swing head Output
2 = 2 Swing head Outputs
3 = 1 Swing head & Light Control Outputs
4 = 2 Swing head & Light Control Outputs
2 = 1/2/4 Hour, Non-Accumulated Timer
3 = 1/2/4 Hour, Accumulated Timer
4 = 0.5/1/2/4 Hour, Non-Accumulated
Timer
5 = 0.5/1/2/4 Hour, Accumulated Timer
8 = 1/2/4/8 Hour, Non-Accumulated Timer
9 = 1/2/4/8 Hour, Accumulated Timer
D = Non-Memory Start-up & Non-Middle Wind Start-up (Mask
Option)
C = Non-Memory Start-up & Middle Wind Start-up
L = Memory Start-up & Non-Middle Wind Start-up (Mask Option)
M = Memory Start-up & Middle Wind Start-up
Note: SC2128C Standard ICs: SC2128C-C41,
SC2128C-C51, Other options are available upon request and
require a minimum order Quantity. Please contact Silan or your local agent for details.
BLOCK DIAGRAM
V
DD
V
SS
OSCI
OSCO
OSC
TIMING
SPEED
CONTROL
LO
MI
ST
REMOTE
FILTER
DECODER
COM
SPEED
TIMER
MODE
SW1
SW2
OFF/MEMS/
BUZZ
LIGHT
KEY
SENSE
TIMER
LED
SCAN
LED1
LED2
LED3
SO1
SWING/
LIGHT
SO2
LIT
MEMORY
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2001.09.26
2
Silan
Semiconductors
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Input/Output Voltage
Power Dissipation
Operating Temperature
Storage Temperature
SC2128C
Test Conditions
--
V
DD
- V
SS
V
DD
– V
SS
= 5.0
--
--
Symbol
V
DD
V
I
, V
O
P
D
Topr
Tstg
Value
0 ~ 6.0
-0.3V ~ V
DD
+0.3V
500
-20 ~ +70
-40 ~ +125
Unit
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
Parameter
Supply Voltage
Symbol
V
DD
--
Test conditions
Min
4.0
Typ
5.0
Max
6.0
Unit
V
V
DD
=5.0V, Oscillator stops.
Stand-by Current
Iq
All output floating,
All input fixed to V
DD
.
Input High Level Voltage
Input Low Level Voltage
Drive Current (COM)
Sink Current (COM)
Drive Current(LED1, LED2, LED3)
Sink Current(LED1, LED2, LED3)
Drive Current (OFF/BUZZ)
Sink Current (OFF/BUZZ)
Sink Current
(LO,MI,ST,SO1, SO2,LIT)
Oscillation frequency
Key Press Duration
Remote Input Bit Duration
V
IH
V
IL
I
OH
I
OL
I
OH
I
OL
I
OH
I
OL
I
OL
f
OSC
T
key
T
bit
--
--
V
DD
=5.0V, Vo=3.5V
V
DD
=5.0V, Vo=1.5V
V
DD
=5.0V, Vo=3.5V
V
DD
=5.0V, Vo=1.5V
V
DD
=5.0V, Vo=2.5V
V
DD
=5.0V, Vo=2.5V
V
DD
=5.0V, Vo=2.5V
--
--
--
V
DD
-1.5
--
15
-12
5
-4
1.5
-2
-6.5
--
80
2.0
--
--
21.5
-16.5
6.5
-5.7
3.0
-3.7
-16
32768
--
2.5
--
1.5
--
--
--
--
--
--
--
--
--
3.0
V
V
mA
mA
mA
mA
mA
mA
mA
Hz
ms
ms
--
134
200
µA
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2001.09.26
3
Silan
Semiconductors
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
SC2128C
Function
No connection
Remote control sensor input
Negative power supply
Oscillator input Pin
Oscillator output Pin
Positive power supply
OFF control key input, shared with buzzer output
SPEED key control input
MODE key control input
Swing head 1 control key input
Light control key input
No connection
Ordinary wind indicator LED output
Light output
Swing head 1 output
TIMER key control input
Indicator LED common output
Indicator LED output Pin
Indicator LED output Pin
Indicator LED output Pin
(Strong) Speed output Pin
(Middle) Speed output Pin
(Low) Speed output Pin
Swing head 2 output
--
I
--
I
O
--
Symbol
NC
REMOTE
V
SS
OSCI
OSCO
V
DD
OFF/BUZZ
SPEED
MODE
SW1
LIGHT
NC
LORD
LIT
SO1
TIMER
COM
LED3
LED2
LED1
ST
MI
LO
SO2
I/O
I/O
I
I
I
I
--
O
O
O
I
O
O
O
O
O
O
O
O
FUNCTIONAL DESCRIPTION
1. CONTROL KEYS
Up to six(6) function keys – SPEED, MODE, TIMER, SW1, LIGHT and OFF/MEMS – may be used on the
control panel of fan to access SC2128C to its full versatility. OFF/BUZZ key input pin serves further as buzzer
output BUZZ pin. All key inputs are internally pulled-high in SC2128C.
SPEED key controls the fan speed. TIMER key adjusts off-timer. MODE key sets fan into various modes of
operation. SW1 key control the head swing of fan. LIGHT key toggles the LIT output ON and OFF. OFF/BUZZ key
resets the fan to idle state when fan is ON. LIT output is not affected by OFF key.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2001.09.26
4
Silan
Semiconductors
2. SPEED KEY
SC2128C
SPEED key is used to (1) turn on the fan (2) change speed of the fan. SLEEP key my turn on the fan from remote
control handset. All the other key scan NOT turn on the fan. All the other keys, except LIGHT key, can NOT
operate until fan is turned on. The diagram shows the state transition of SC2128C for successive pressing of
SPEED key.
MID
Middle wind start-up optioned
S
ED
PE
KE
Y
LO=Z
MI=L
ST=Z
SPEED KEY
OFF
LO=Z
MI=Z
ST=Z
SPEED KEY
MI start
LO=Z
MI=L
ST=Z
2-3 sec, delay
LOW
LO=L
MI=Z
ST=Z
Z=high impedence
L=low voltage
STR
LO=Z
MI=Z
ST=L
3. TIMER KEY
TIMER key is used to set time schedule after which SC2128C will automatically restore off state(off-timer).
When the fan is on, pressing TIMER key sets up the off-timer. Each pressing of TIMER key increases the
timer by one step. Each time increment step is determined by various timer options. Either 0.5 or 1 hour
per step may be selected, and either 3 levels or 4 levels timer may be selected. Please see TIMER section
for details.
4. MODE KEY
MODE key is used to bring SC2128C around ORD
(ordinary wind) mode, RTM (rhythm wind ) mode and
RSL(rhythm sleep wind ) mode. In ORD mode, the wind
speed is set by SPEED key and does not change as
time passes. In RTM mode the wind speed cycles
through three rhythm wind, patterns as set by the
SPEED key. In RSL mode, however, the fan
automatically steps down one level (strong to middle,
middle to low) every 30 minutes and keeps in low wind
until off-timer times out. Four modes of operation are
described in details later.
KE
Y
M
O
D
E
SPEED KEY
OFF
ORD
RSL
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2001.09.26
5
MODE KEY
E
Y
KE
D
EE
SP
Y
KE
RTM
O
M
D
Microchip MCU
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