Datasheet SC2128C-C32D, SC2128C-C32S, SC2128C-C33D, SC2128C-C33S, SC2128C-C34D Datasheet (SILAN)

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Semiconductors

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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.

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.

PIN CONFIGURATION

NC

1

2

REMOTE

3

SS

V

4

OSCI

5

OSCO

6

DD

V

SC2128C

SPEED

MODE

SW1

LIGHT

7

8

9

10

11

NC

OFF/BUZZ

24

23

22

21

20

19

18

17

16

15

14

1312

SC2128C

APPLICATIONS

* Optimized for fan application

* Suitable for heater fan, cooling fan,

and other home appliances with remote

control, timer and/or output level control

SO2

LO

MI

ST

LED1

LED2

LED3

COM

TIMER

SO1

LIT

LORD

DIP-24-300-2.54

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ORDERING INFORMATION

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SC2128C

SC2128C- X X X X

S = Swing Head Output(s) Controlled by a Single Key (Mask
Option)

D = Two Swing Head Outputs Controlled by Double Keys (D can be
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

DDVSS

V

OSCI

OSCO

REMOTE

SPEED

TIMER

MODE

SW1

SW2

OFF/MEMS/
BUZZ

LIGHT LIT

OSC TIMING

FILTER DECODER

TIMER

KEY

SENSE

MEMORY

SPEED

CONTROL

LED

SCAN

SWING/

LIGHT

LO

MI

ST

COM

LED1

LED2

LED3

SO1

SO2

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ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Test Conditions Value Unit

Supply Voltage VDD -- 0 ~ 6.0 V

Input/Output Voltage VI, VO V

Power Dissipation PD V

Operating Temperature Topr -- -20 ~ +70 °C

Storage Temperature Tstg -- -40 ~ +125 °C

- VSS -0.3V ~ VDD+0.3V V

DD

– V

DD

= 5.0 500 mW

SS

ELECTRICAL CHARACTERISTICS

Parameter Symbol Test conditions Min Typ Max Unit

Supply Voltage VDD -- 4.0 5.0 6.0 V

V

=5.0V, Oscillator stops.

DD

Stand-by Current Iq

Input High Level Voltage VIH -- VDD-1.5 -- -- V

Input Low Level Voltage VIL -- -- -- 1.5 V

Drive Current (COM) IOH VDD=5.0V, Vo=3.5V 15 21.5 -- mA

Sink Current (COM) IOL VDD=5.0V, Vo=1.5V -12 -16.5 -- mA

Drive Current(LED1, LED2, LED3) IOH VDD=5.0V, Vo=3.5V 5 6.5 -- mA

Sink Current(LED1, LED2, LED3) IOL VDD=5.0V, Vo=1.5V -4 -5.7 -- mA

Drive Current (OFF/BUZZ) IOH VDD=5.0V, Vo=2.5V 1.5 3.0 -- mA

Sink Current (OFF/BUZZ) IOL VDD=5.0V, Vo=2.5V -2 -3.7 -- mA

Sink Current

(LO,MI,ST,SO1, SO2,LIT)

Oscillation frequency f

Key Press Duration T

Remote Input Bit Duration T

All output floating,

All input fixed to V

I

VDD=5.0V, Vo=2.5V -6.5 -16 -- mA

OL

-- -- 32768 -- Hz

OSC

-- 80 -- -- ms

key

-- 2.0 2.5 3.0 ms

bit

DD

.

SC2128C

-- 134 200 µA

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PIN DESCRIPTION

Pin No. Symbol I/O Function

1 NC -- No connection

2 REMOTE I Remote control sensor input

3 VSS -- Negative power supply

4 OSCI I Oscillator input Pin

5 OSCO O Oscillator output Pin

6 VDD -- Positive power supply

7 OFF/BUZZ I/O OFF control key input, shared with buzzer output

8 SPEED I SPEED key control input

9 MODE I MODE key control input

10 SW1 I Swing head 1 control key input

11 LIGHT I Light control key input

12 NC -- No connection

13 LORD O Ordinary wind indicator LED output

14 LIT O Light output

15 SO1 O Swing head 1 output

16 TIMER I TIMER key control input

17 COM O Indicator LED common output

18 LED3 O Indicator LED output Pin

19 LED2 O Indicator LED output Pin

20 LED1 O Indicator LED output Pin

21 ST O (Strong) Speed output Pin

22 MI O (Middle) Speed output Pin

23 LO O (Low) Speed output Pin

24 SO2 O Swing head 2 output

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.

SC2128C

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2. SPEED KEY

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.

Middle wind start-up optioned

OFF

SPEED KEY 2-3 sec, delay

LO=Z

MI=Z

ST=Z

MI start

LO=Z

MI=L

ST=Z

LOW

LO=L
MI=Z
ST=Z

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.

Y

E

K

D

E

E

P

S

Z=high impedence
L=low voltage

SP

EED KEY

SPEED KEY

OFF ORD

SC2128C

MID

LO=Z

MI=L

ST=Z

STR

LO=Z

ST=L

MI=Z

M

O

M

O

DE KEY

SPEED KEY

DE KEY

RTM

RSL

MODE KEY

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5. SW1 KEY

SW1 controls the output status of SO1 and SO2 outputs

which in turn control the head swing of fan. Each

pressing of SW1 key toggles SO1 and SO2 outputs as

shown in the diagram right.

6. LIGHT KEY

LIGHT key toggles LIT output on(L) and off(Z). LIT output can only be controlled with LIGHT key (from both panel

and remote control) and SLEEP key (if available) on remote control handset. OFF key does NOT affect LIT

output. LIT output is NOT affected by OFF key as well as off-timer times out.

7. OFF/BUZZ KEY

OFF/BUZZ key functions differently depending on whether the fan is ON or OFF. It functions as OFF key when

the fan is ON, and is used to bring SC2128C from any on state into off state. LIT output is NOT affected by OFF

key.

8. INDICATOR LEDS

Up to twelve(13) indicator LEDs may be constructed on the control panel of fan built with SC2128C. Six(6) LED

sare constructed as 3x2 LED matrix formed by COM and LED1, LED2, LED3. The other six(6) LEDs are built in

series with TRIAC outputs and the thirteenth LED is used as Ordinary Wind mode indicator. The diagrams show

how the LED matrix is constructed.

V

DD

COM

LED3

LED2

LED1

V

Tb2

Tb3 Tb0 Tb1

SS

-5V

Rhythm

Sleep

SC2128C

S

SO1=Z
SO2=Z

S

W

SC2128C

W

1

SC2128C

SO1=L

Y

E

SO2=Z

K

1

Fan already ON

Z=high impedence

L=low voltage

SO1=L

K

E

SO2=L

Y

LO

MI

ST

SO1

SO2

LIT

LORD

low

middle

strong

Swing 1

Swing 2

light

ORD

S

W

1

K

E

Y

SO1=Z
SO2=L

Y

E

K

1

W

S

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* Four LEDs (Tb0, Tb1, Tb2, Tb3) are used to indicate the off-timer period. Depending on the base timer step

option, timer step may be 0.5 hour or 1 hour as indicated in the diagram.

If SC2128C is selected with 4 hour timer

option

SC2128C

Tb0=0.5 hour

b1=1 hour
b2=2 hour
b3=4 hour

If SC2128C is selected with 8 hour timer

The time schedule is the sum of all ON LEDs. For example, if SC2128C is programmed with 1/2/4/8 hour

accumulated timer option, and is Tb0 is ON, Tb1 is OFF, Tb2 is OFF, Tb3 is ON, then the schedule period is 9

hours (1 hr + 9 hr).

* Rhythm LED , Sleep LED and Ordinary LED indicate SC2128C operation modes.

Operation mode Rhythm LED Sleep LED Ordinary LED

ORD (ordinary wind) OFF OFF ON

RTM (rhythm wind) ON OFF OFF

RSL (rhythm sleep wind) OFF ON OFF

* Three LEDs – Low, Middle and Strong – are used to indicate the respective output status of LO, MI, ST output.

LED being ON indicates output active (L). LED being OFF indicates output inactive (Z). Only one output among

LO, MI and HI may be active at a specific time.

* Swing1 LED, Swing2 LED and Light LED indicated respective output status of SO1, SO2, and LIT.

9. TIMER

The external timer of SC2128C may be bonding optioned

into six (6) configurations as shown. Each pressing of

TIMER key will step the internal timer one step up. The

actual sequence depends on the TIMER option selected.

The following diagrams show the timer sequence for each

TIMER option. TIMER automatically counts down as time

passes by. The count down sequence reverses the key

sequence and is also shown in the following diagrams.

option

: 0.5, 1, 2, 4 hours non-accumulated



: 1, 2, 4, 8 hours non-accumul ated



: 0.5, 1, 2, 4 hours accumulated



: 1, 2, 4, 8 hours accumulated



: 1, 2, 4 hours non-accumulated



: 1, 2, 4 hours accumulated



Tb0=1 hour

b1=2 hour
b2=4 hour
b3=8 hour

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TIMER TIMER

None

R

E

M

I

T

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0.5hr

0.5 1

0.5hr

TIMER

2hr

(1)

T

r

h

I
M

5
.

E

0

R

24



TIMER TIMER

None

1hr

R

E

M

I

T

1hr

0.5 1

h

2

TIMER

24

4hr

(2)

SC2128C

TIMER TIMER

T

r

I

M
E
R

None

T

I

1hr

M

E

R

1 2

1hr

TIMER
4+
2+

1

TIMER TIMER

1hr

1hr

TIMER

4+

2

1hr

(6)

2+

1

1hr

4

1hr

r

T

h

I
M

1

E

R

4+

1

TIMER TIMER

None

0.5hr

T

I

M

E

R

0.5 1

0.5hr

4+
2+
1+

0.5

TIMER

0.5hr

TIMER

0.5hr

4+
2+

1

1+

0.5

TIMER

0.5hr

TIMER

0.5hr

4+
2+

0.5

2

TIMER

0.5hr

TIMER

0.5hr

4+

2

TIMER

0.5hr

(3)

TIMER TIMER

None

1hr

T

I

M

E

R

1

TIMER

2

1hr

TIMER

8+
4+
2+

1

1hr

TIMER

2+

1

1hr

TIMER
8+
4+

2

1hr

TIMER

4

1hr

8+
4+

1hr

TIMER

1

TIMER

8+

4

1hr

(4)

10. RHYTHM WIND

SC2128C features rhythm wind mode. It can be set

into rhythm wind mode by pressing MODE key.

Furthermore, there are three levels – strong, middle

and low rhythm wind. Pressing SPEED key cycles

SC2128C around the three levels, from low to middle,

middle to strong, then strong to low. Initial rhythm wind

level on entering RHYTHM wind mode is the same as

the ordinary wind level while leaving ORDINARY wind

mode and entering RHYTHM wind mode. The right

diagram depicts the strong, middle and low rhythm

wind patterns.

TIMER

None

T

0.5hr

4+
1+

0.5

1hr

8+
2+

1

2+

1

TIMER

0.5hr

4+

2

TIMER

1hr

TIMER

0.5hr

4+

1

TIMER

1hr

8+

2

2+
1+

0.5

TIMER

0.5hr

4+
2+

1

TIMER

1hr

TIMER

0.5hr

4+

0.5

TIMER

1hr

8+

1

4

r

T

h

I

5

M

.

0

E
R

8

T

r

I

h

M

1

E

R

TIMER

2+

0.5

TIMER

4+

1

1hr

1hr

I

M

E

1 2

R

(5)

TIMER

1hr

4

r

T

h

I
M

2

E

R

ST

MI

LO

t=0 Strong rhythm wind pattern

seconds

t=90

ST

MI

LO

t=0

Middle rhythm wind pattern

seconds

t=90

ST

MI

LO

t=0

Low rhythm wind pattern

seconds

t=90

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11. RHYTHM SLEEP WIND MODE

Pressing MODE key in sleep wind mode brings

SC2128C into rhythm sleep wind. In rhythm sleep

wind mode, SC2128C outputs LOW, MIDDLE or

STRONG rhythm wind pattern and automatically

steps down one level every 30 minutes until it

reaches low rhythm wind level. If no off-timer is set,

SC2128C keeps in low rhythm wind output.

Otherwise it restores off state when the off-timer

times out.

12. BUZZER OUTPUT

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

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

OFF/BUZZ 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. Note that when OFF/BUZZ outputs the pulse train,

key input is suppressed. That is, pressing OFF/BUZZ key

when the buzzer is buzzing is NOT recognized by SC2128C.

The diagram right shows the buzzer connection.

13. REMOTE CONTROL DECODER

SC2128C 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/BUZZ – to be

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

SC2128C 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 V

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 SC2128C 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.

Strong rhythm wind
Middle rhythm wind

Low rhythm wind

Strong rhythm wind
Middle rhythm wind

Low rhythm wind

Strong rhythm wind
Middle rhythm wind

Low rhythm wind

t=0 t=0.5hr t=1.0hr timer timeout

Strong rhythm sleep mode wind pattern

t=0 t=0.5hr t=1.0hr timer timeout

Middle rhythm sleep mode wind pattern

t=0 t=0.5hr t=1.0hr timer timeout

Low rhythm sleep mode wind pattern

SC2128C

OFF/BUZZ

"0" bit:

"1" bit:

b0 b1 b2 b3 b4 b5 b6 b7Start/Code word:

start word 1st code word 2nd code wordCode frame

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SC2128C

V

DD

OFF/BUZZ key

V

SS

-5V

Code bit:

0.625ms

1.875ms

2.5ms

Rev: 1.1 2001.09.26

DD or VSS. With

hours

hours

hours

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14. CUSTOMER CODE

The default customer code of SC2128C is internally mask programmed to b0 ~ b7 = 00110011. Code bit b3 ~ b6

may be mask programmed to any value according to customer specification under terms and conditions agreed

by SILAN. Suitable NRE is involved with customizing default customer code. Please refer to the following table.

15. REMOTE CONTROL KEYS

Up to eight keys may be built on the remote control handset. Except SLEEP key, all keys functions the same as

their panel counterparts. SLEEP key is not available on fan panel, and is only available on remote control

handset. Pressing SLEEP key brings SC2128C to the output states as follows:

SPEED Middle wind

MODE RTM wind

TIMER 4 hours or 8 hours

SWING SO1 ON, SO2 OFF

LIGHT LIT ON

The remote transmission code words are defined in the following table.

Equivalent Key

SPEED 0 0 1 1 1 0 1 0 I1

MODE 0 1 0 1 1 0 0 0 I2

TIMER 0 1 1 0 0 0 1 0 I3

LIGHT 1 0 0 1 1 1 0 0 I4

SLEEP 1 0 1 0 0 1 1 0 I5

SW2 1 0 1 1 0 0 0 1 I6

SW1 1 1 0 0 0 1 0 1 I7

OFF/MEMS 1 1 0 1 0 0 1 0 I8

Mask Option Start word

Default Customer Code b0 b1 b2 b3 b4 b5 b6 b7

Mask Programmable

Customer Code

b0 b1 b2 b3 b4 b5 b6 b7

0 0 1 1 0 0 1 1
0 0 1 1 0 0 0 1
0 0 1 1 0 1 1 1
0 0 1 1 0 1 0 1
0 0 1 1 1 0 1 1
0 0 1 1 1 0 0 1
0 0 1 1 1 1 1 1
0 0 1 1 1 1 0 1
0 0 1 0 0 0 1 1
0 0 1 0 0 0 0 1
0 0 1 0 0 1 1 1
0 0 1 0 0 1 0 1
0 0 1 0 1 0 1 1
0 0 1 0 1 0 0 1
0 0 1 0 1 1 1 1
0 0 1 0 1 1 0 1

Code word

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SC2128C

SC2268

Corresponding

Keys

Rev: 1.1 2001.09.26

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16. VARIOUS OPTIONS

SC2128C accommodates many option possibilities. The options are summarized below:

* Package Option:

Either 16, 18, 20, 22, or 24 pin package.

* Bonding option:

ACC: Accumulated or non-accumulated timer option.

T0.5: Timer scale, 0.5/1/2/4 hour timer or 1/2/4/8 timer option.

3LT: Timer level option, either 4 levels or 3 levels.

NM: Disable memory mode.

* Metal Option:

b3 ~ b6: Replaces default customer codes

NMS: Disable middle wind start-up function

2SW: Dependent/Independent swing head control option.

SC2128C

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APPLICATION CIRCUIT

IR MODULE

9.1k

OFF

SPEED

MODE

SW1

LIGHT

32.768kHz



-5V

47pf

47pf



SC2128C

NC

1

REMOTE

2

VSS

3

OSCI

4

OSCO

5

VDD

6

OFF/BUZZ

7

SPEED

8

MODE

9

SW1

10

LIGHT

NC LORD

SO2

LED1

LED2

LED3

COM

TIMER

SO1

SC2128C

AC

Swing2

220

Low

Middle

Strong

Tb2

Swing1

Light

Tb3

220

220

220

220

220

Tb0

1k









Rhythm

Sleep

Tb1

TIMER

-5V







24

LO

23

MI

22

ST

21

20

19

18

17

16

15

LIT

1411

1312

Two Swing Head Controlled by SW1



200k

6.8V/1w

Supply Circuit

IN4004

470

16V

2SA1015

1k





f

10f

16V

-5V



f

0.1

22



VAR

/2w

2.5f/250V

FUSE

AC

AC

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SC2268 IR TRANSMITTER APPLICATION CIRCUIT



+3V

SC2128C

SPEED

MODE

TIMER

LIGHT

SLEEP

SW2

SW1

OFF/MEMS

1

2

3

4

5

6

7

8

I1

I2

I3

I4

Tx OUT

I5

I6

I7

I8

SC2268

Vcc

OSC1

OSC2

Vss

16

15

220pf

455kHz

14

220pf

13

C4

12

C5

11

C6

10

A1015

1kΩ

10Ω

IR LED

C1815

9

Note: SC2268 is recommended to be used with SC2128C. For this circuit, the “Start Word” is “00110011”

PACKAGE OUTLINE

DIP-24-300-2.54

2.54

6.40

7.62

0.25

3.51

34.50

0.46

1.50

5.083.30

UNIT: mm

15 degree

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2001.09.26

13

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