Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
1
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.
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
OSCI
OSCO
V DD
OFF/BUZZ
SPEED
MODE
LORD
COM
LED3
LED2
LED1
LIT
SO1
TIMER
SO2
ST
MI
LO
NC
V SS
LIGHT
SW1
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
2
ORDERING INFORMATION
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)
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
OFF/MEMS/
BUZZ
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
3
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Test Conditions Value Unit Supply Voltage V DD-- 0 ~ 6.0 V Input/Output Voltage V I, V O V DD - V SS-0.3V ~ V DD+0.3V V Power Dissipation P D V DD – V SS = 5.0 500 mW Operating Temperature Topr -- -20 ~ +70 °C Storage Temperature Tstg -- -40 ~ +125 °C ELECTRICAL CHARACTERISTICS
Parameter Symbol Test conditions Min Typ Max Unit Supply Voltage V DD-- 4.0 5.0 6.0 V Stand-by Current Iq
V DD=5.0V, Oscillator stops.
All output floating,
All input fixed to V DD.
-- 134 200 μA Input High Level Voltage V IH-- V DD-1.5 -- -- V Input Low Level Voltage V IL-- -- -- 1.5 V Drive Current (COM) I OH V DD=5.0V, Vo=3.5V 15 21.5 -- mA Sink Current (COM) I OL V DD=5.0V, Vo=1.5V -12 -16.5 -- mA Drive Current(LED1, LED2, LED3) I OH V DD=5.0V, Vo=3.5V 5 6.5 -- mA Sink Current(LED1, LED2, LED3) I OL V DD=5.0V, Vo=1.5V -4 -5.7 -- mA Drive Current (OFF/BUZZ) I OH V DD=5.0V, Vo=2.5V 1.5 3.0 -- mA Sink Current (OFF/BUZZ) I OL V DD=5.0V, Vo=2.5V -2 -3.7 -- mA Sink Current
(LO,MI,ST,SO1, SO2,LIT)
I OL V DD=5.0V, Vo=2.5V -6.5 -16 -- mA Oscillation frequency f OSC-- -- 32768 -- Hz Key Press Duration T key-- 80 -- -- ms Remote Input Bit Duration T bit-- 2.0 2.5 3.0 ms
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
4
PIN DESCRIPTION
Pin No. Symbol I/O Function
1 NC -- No connection
2 REMOTE I Remote control sensor input
3 V SS-- Negative power supply
4 OSCI I Oscillator input Pin
5 OSCO O Oscillator output Pin
6 V DD-- 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.
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
5
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.
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.
M
O
D
E
K
E
Y
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
6
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.
SC2128C SC2128C
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
7
* 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
If SC2128C is selected with 8 hour timer
option
Tb0=0.5 hour
b1=1 hour
b2=2 hour
b3=4 hour
Tb0=1 hour
b1=2 hour
b2=4 hour
b3=8 hour 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.
: 0.5, 1, 2, 4 hours non-accumulated
: 1, 2, 4, 8 hours non-accumulated
: 0.5, 1, 2, 4 hours accumulated
: 1, 2, 4, 8 hours accumulated
: 1, 2, 4 hours non-accumulated
: 1, 2, 4 hours accumulated
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
8
(5)
(6)
(2)
(1)
(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.
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
9
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.
Strong rhythm wind
Low rhythm sleep mode wind pattern
Middle rhythm wind
Low rhythm wind
Strong rhythm wind
Middle rhythm wind
Low rhythm wind
Strong rhythm wind
Middle rhythm wind
Low rhythm wind
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 DD or V SS. 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 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.
Code frame
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
10
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.
Mask Option Start word
Default 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
Mask Programmable
Customer Code
0 0 1 0 1 1 0 1
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 S O1 ON, S O2 OFF
LIGHT LIT ON
The remote transmission code words are defined in the following table.
Code word
Equivalent Key
b0 b1 b2 b3 b4 b5 b6 b7
SC2268
Corresponding
Keys 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 S
W2 1 0 1 1 0 0 0 1 I6 S
W1 1 1 0 0 0 1 0 1 I7
OFF/MEMS 1 1 0 1 0 0 1 0 I8
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
11
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
2S W: Dependent/Independent swing head control option.
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
12
APPLICATION CIRCUIT
Silan
Semiconductors SC2128C
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.09.26
13
SC2268 IR TRANSMITTER APPLICATION CIRCUIT
IR LED Note: SC2268 is recommended to be used with SC2128C. For this circuit, the “Start Word” is “00110011”