GENERAL DESCRIPTION
SM3501 is a Fan Controller CMOS IC, has
three wind modes; normal, rhythm and sleep
wind. Four kinds of timer setting and a
toggled O/P that can be used as swing/light.
Memory function is available; the Speed,
Mode, Swing functions will operate as last
state; if last state is Sleep mode, press
SPEED or ON/OFF key enable fan controller
while memory functions( Speed / Mode
/ Swing ) will be returned to the last state
before sleep mode operation.
FEATURES
* High performance CMOS technology
* 455KHz or RC type can be selected.
* Two to three wind modes can be selected.
Normal, Rhythm and Sleep wind mode.
* Three-wind grade control in each wind mode:
Low, Medium and Strong wind.
* Four types of timer setting by PIN option:
ladder adder
(1/2 - 1 - 2 - 4 - 8HRS / 1 - 2 - 4HRS)
non-ladder adder
(1 - 2 - 4 - 8HRS / 1 - 2 - 4HRS)
* SPEED or ON/OFF key can enable fan
controller by PIN option
APPLICATIONS
* Electronic Fan
* Heater Fan
PIN ASSIGNMENT
18
MID
17
STR
16
OPTION2
15
VSS
14
COM2
13
COM1
12
MODE
11
TIMER
10
ON-OFF/OFF
TGI
LOW
TGO
BUZ
OSC1
OSC2
OPTION1
VDD
SPEED
9
1
2
3
4
5
6
7
8
SM3501
Page 1
V.2.0 Mar 8,2002
SM3501
FAN CONTROLLER
S
AM
H
OP
Microelectronics Corp.
Page 2
V.2.0 Mar 8,2002
PIN FUNCTION
No.
Pin Name
I/O
1
2
3
4
5
6
7
LOW
TGO
BUZ
OSC1
OSC2
OPTION1
VDD
O
O
I
O
I
POWER
8
9
10
SPEED
TGI
OFF/ON-OFF
I/O
I/O
I/O
11
12
TIMER
MODE
I/O
I/O
13
COM1
O
14
COM2
O
O
15
VSS
16
OPTION2
17
STR
18
MID
POWER
I
O
O
Function
Toggle output control input and LED output
LED scanning common pin
Negative power supply
Wind speed control output
Wind speed control output
Timer mode option-float: nonadder, VSS: adder
ON-OFF or OFF function control input and LED output
Wind mode selection input and LED output
LED scanning common pin
Timer setting input and LED output
Crystal output
Positive power
Wind grade selection input and LED output
Fan start-up option-float: Speed, VDD:ON/OFF
Wind speed control output
Trigger output to drive piezo
Crystal input
Toggle output
SM3501
FAN CONTROLLER
S
AM
H
OP
Microelectronics Corp.
Page 3
V.2.0 Mar 8,2002
PANEL DISPLAY
BLOCK DIAGRAM
VDD VSS
Buzzer
Oscillator
Fan Function Control
SPEED/ MODE/ TIMER/ SWING/
MENORT
Key Input
LED Output
Scan_Signal
Timer
System Timing Generator
Output Drive
OPTION1
OPTION2
OSC1
OSC2
STRONG
MEDIUM
LOW
TGO
BUZ
OFF
SPEED
TIMER
MODE
TGI
COM1
COM2
OFF
(ON-OFF)
MODE
TGI
SLP
RHY
NOR
TGO
S
M
L
TIMER
4HR (8HR)
2HR (4HR)
1HR (2HR)
1/2HR (1HR)
ON/SPPED
(SPEED)
* NOTE: " " Function can be chosen.
SM3501
FAN CONTROLLER
S
AM
H
OP
Microelectronics Corp.
Page 4
V.2.0 Mar 8,2002
FUNCTION DESCRIPTION
SM3501 has five control signal operations:
* Start-up by SPEED key
a. function turn off ( OFF key )
b. wind mode select ( MODE key )
c. start-up function and wind speed select ( ON / SPEED key )
d. timer setting ( TIMER key )
e. swing head or light ( TGI key )
* Start-up by ON / OFF key
a. function control ( ON / OFF key )
b. wind mode select ( MODE key )
c. wind spped select ( SPEED key )
d. timer setting ( TIMER key )
e. swing head or light ( TGI key )
Only SPEED or ON / OFF key can enable the fan controller ; wind mode, timer and swing
head inputs can not be accepted when fan is not activated. The fan controller will be turned
off by timer time out or OFF ( ON / OFF ) key inputs.
When more than one key are pressed, controller will not accept the multi-key's control signal,
if the panel keys are pressed more than six seconds, controller will generate a "Bi-Bi-Bi-Bi"
warning sound.
state of fan controller is as
follows:
* Memory function available
If Fan controller is OFF on sleep mode, all memory functions will be returned to the LAST
STATE BEFORE SLEEP MODE operation.
a. grade as last state but with starting medium wind for three seconds
b. the wind mode as last state except sleep mode
c. swing function as last state
d. timer setting off
A. OFF KEY
When fan controller is on, press the OFF key on panel, fan functions will be turned off.
* PIN 6 OPTION1: ON / OFF KEY
When fan controller functions are on, press ON / OFF key on panel, fun function will be
turned off; if functions are off, press the key to turn on fan functions.
SM3501
FAN CONTROLLER
S
AM
H
OP
Microelectronics Corp.
Page 5
B. SPEED KEY
* PIN 6 OPTION1: SPEED KEY ONLY
If fan controller is off, SPEED key cannot be used, must press ON / OFF key to turn on the fan
controller. When fan controller is on, press SPEED key on panel the wind grade changes as
follows:
V.2.0 Mar 8,2002
When fan controller is off, press SPEED key on panel, fan is turned on, initial state is LOW
wind; when memory function is available, the wind grade will operate as last state. Both
conditions there are three seconds startng wind. Press the SPEED key again, the wind will
be changed as follows:
:Pluse is put into OFF pin
:SPEED key used
:SPEED key used
:Pluse is put into ON / OFF pin
:SPEED or ON / OFF key used
OFF
LOW
MEDIUM
STRONG
OFF
LOW
MEDIUM
STRONG
C. MODE KEY
SM3501 has three types of wind
mode key setting. Memory function is available except on sleep mode.
:Press MODE key : normal setting
:Pluse is put into OFF or ON / OFF pin
:SPEED or ON / OFF key used
OFF
NOR
RHY
SLP
SM3501
FAN CONTROLLER
S
AM
H
OP
Microelectronics Corp.
PDF 
ZIP