SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
Page 1
V2.0 Mar 8,2002
GENERAL DESCRIPTION
The SM-T2 / SM-R2 is a pair of CMOS
chip, it was designed for remote controlled
car applications.
The SM-T2 / SM-R2 has five control keys
for controlling the motions ( i.e. forward,
backward rightward, leftward and the turbo
function ) of the remote controller car.
FEATURES
* Power supply : 2.4V - 5.0V
* Low stand-by current
* Five functions control
* Auto-power-off function for SM-T2
* Few external components are needed
APPLICATION
* Remote control car etc.
S
AM
H
OP
Microelectronics Corp.
PIN ASSIGNMENTS (TOP VIEW)
VO2
GND
SI
OSCI
OSCO
RIGHT
LEFT
RDB
VI2
VO1
VI1
VDD
TURBO
FORWARD
BACKWARD
LDB
RIGHTB
NC
GND
BACKWARDB
FORWARDB
TURBOB
SC
LEFTB
NC
OSCI
OSCO
PC
VDD
SO
SM-T2
SM-R2
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Page 2
BLOCK DIAGRAM
LATCH
DECODING
CIRCUIT
OSCILLATOR
TIMING
GENERATOR
RIGHT
TIMING
GENERATOR
LOGIC
LATCH
CIRCUIT
OSCI
OSCO
ENCODING
CIRCUIT
SO
SC
OSCILLATOR
RIGHTB
LEFTB
TURBOB
FORWARDB
FORWARDB
PC
TESTB
SM-T2
LEFT
TURBO
BACKWARD
FORWARD
OSCI
AMP
OSCO
SI
VI1
VI2
SM-R2
PLA
COUNTER
CONTROL
LOGIC
LDB
RDB
V2.0 Mar 8,2002
VO1
VO2
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
Page 3
PIN DESCRIPTION
SM-T2
Pin No.
1
2, 13
3
4
5
6
7
8
9
10
11
12
14
Pin Name
RIGHTB
NC
GND
BACKWARDB
FORWARDB
TURBOB
SC
SO
VDD
PC
OSCO
OSCI
LEFTB
Description
The rightward function will be selected, if this pin is connected to GND
Negative power supply
The backward function will be selected, if this pin is connected to GND
The forward function will be selected, if this pin is connected to GND
The turbo function will be selected, if this pin is connected to GND
Output pin of the encoding signal with carrier frequency
Positive power supply
Power control output pin
Oscillator output pin
Oscillator input pin
The leftward function will be selected, if this pin is connected to GND
SM-R2
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
VO2
GND
SI
OSCI
OSCO
RIGHT
LEFT
RDB
LDB
BACKWARD
FORWARD
TURBO
VDD
VI1
VO1
VI2
Description
Inverter 2 output pin for power amplify
Negative power supply
Input pin of the encoding signal
Oscillator input pin
Oscillator output pin
Rightward output pin
Leftward output pin
Leftward function disable, if this pin is connected to GND
Backward output pin
Forward output pin
TURBO output pin
Positive power supply
Inverter 1 input pin for power amplify
Inverter 1 output pin for power amplify
Inverter 2 input pin for power amplify
15
16
VER 1.0, DEC. 2000
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
Page 4
1. Code Format
Encode Rule (Bit Format)
FUNCTION DESCRIPTION
2. Data Format
W2 W2 W2 W2 (n) x W1 W2 W2 W2 W2 (n) x W1 W2 W2 W2 W2
1KHz
W2
W1
1KHz 50% Duty cycle
500Hz 75% Duty cycle
W2
W2
W2
W2
1
4
3
2
W1 W1 W1 W1
1
4
3
2
W1
n-th
W2
W2
W2
W2
W1
start code
function code
1 word
No. of Function Code (n) W1
4
10
16
22
28
34
40
46
52
58
64
Function Key
Forward
Forward & Turbo
Turbo
Turbo & Forward & Left
Turbo & Forward & Right
Backward
Backward & Right
Backward & Left
Left
Right
Decode Result
End Code
Forward
Forward
Turbo
Forward & Left
Forward & Right
Backward
Backward & Right
Backward & Left
Left
Right
V2.0 Mar 8,2002
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
Page 5
3. Encode/Decode Timing
(A)
Any function key
1st word
3rd word
2nd word
1
4
3
2
8
7
6
5
Decode output
Encode output
end code
9ms
9ms
(B)
SI
Decode output
8 msec
8 msec
1ms
(n) W1
T
T=17ms+(nW1)x1ms
V2.0 Mar 8,2002
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
Page 6
ABSOLUTE MAXIMUM RATINGS
Parameter
DC Supply Voltage
Input/Output Voltage
Operating temperature
Storage Temperature
Symbol
VDD
VIN
Topt
Tstg
COMMENTS
Never allow a stress to exceed the values listed under "Absolute Maximum Ratings", other
-wise the device would suffer from a permanent damage. Nor is a stress since an
extended exposure to the absolute maximum rating condition may also affect the reliability
of the device, if not causing a damage thereof.
Unit
V
V
o
C
o
C
Ratings
5
GND-0.3 to VSS +0.3
-10~60
-25~125
DC ELECTRICAL CHARACTERISTICS
Parameter
Operating Voltage
Operating Current
Stand-by Current
DC O/P Driving Current
AC O/P Driving Current
AC O/P Frequency
Symbol
VDD
Idd
Istb
Idrive
Idrive
Faudio
Unit
V
mA
m
A
mA
mA
Hz
Min.
3
5
5
500
Typ.
4
Max.
5
2
10
1K
TX2 (VDD=4.5V, Fosc=128KHz, TA=25
o
C, unless otherwise specified.
RX2 (VDD=4.0V, Fosc=128KHz, TA=25
o
C, unless otherwise specified.
Parameter
Operating Voltage
Operating Current
O/P Driving Current
O/P Sinking Current
Effect Decoding Frequency
Variation
Symbol
VDD
Idd
Idrive
Isink
Ftolerance
Min.
3
1
1
-20
Typ.
4
Max.
5
2
20
Unit
V
mA
mA
mA
%
V2.0 Mar 8,2002
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
Page 7
APPLICATION CIRCUIT
TX2
RIHGTB
TESTB
GND
BACK
FOR
TURBOB
SC
LEFTB
OFF
OSCI
OSCO
PC
VDD
SO
1
2
3
4
5
6
7
S1 S2 S3 S4
C7
68
R6
100
V2
9014
R3
220K
CR1
27.145
L1
2.2
C9
68
C7
68
R5
33
K
C8
.02
R4
6.8K
R1
100
C6
0.2
R2
4.7K
R10
1K
V3
LED
R12
10M
C11
4.7
C12
.01
POWER
OFF
R7
200K
S6
S5
V7
4148
R9
330
V4
4.7V
V1
9014
R11
10M
B1
9V
V5
8550
L2
2.2
V6
9013
R8
3.9K
C4
150
L3
L4
6.8
A1
ANTENNA
L4
6.8
L4
6.8
C1
100
C2
150
14
13
12
11
10
9
8
V2.0 Mar 8,2002
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
Page 8
APPLICATION CIRCUIT
RX
VO2
GND
SI
OSCI
OSCO
RIGHT
LEFT
ROB
VI2
VO2
VI1
VDD
TURBO
F/WARD
B/WARD
LDB
1
2
3
4
5
6
7
8
R4
2.2M
C7
0.1
C8
470
16
15
14
13
12
11
10
9
C10
30
R6
2.2M
R7
2.2K
C11
1000
R8
200K
R21
1K
R22
1K
R5
2.2K
C9
0.1
R3
2.2K
C1
4
C2
47
L2
C6
18
L1
2.2
C3
3000
R1
1K
C4
4.7
C5
.02
R2
180K
V1
C1815
A1
C15
.01
C13
4.7
C12
100
C14
.01
VD1
4.2V
R12
510
C18
100
C19
.1
R20
100
V8
9013
R24
1K
R23
1K
M1
R16
100
V2
9013
R15
330
V3
8050
V4
8550
V9
8550
V5
8550
V6
8050
R18
330
R17
100
V7
9013
R11
10
M2
C6
.02
R10
4.3K
R25
1K
R19
330
R14
220
V10
9013
V15
8050
V14
8550
V13
8550
V12
8050
V11
9013
R9
330
R13
220
C17
.02
12V
9V
V2.0 Mar 8,2002
SM-T2/SM-R2
REMOTE CONTROLLER
WITH FIVE FUNCTION
S
AM
H
OP
Microelectronics Corp.
PDF 
ZIP