DESCRIPTION
SM5038RF is a remote control decoder paired
with SM5028RF utilizing CMOS Technology. It
has 12-bit 2-state address pins providing a 2
12
address codes; thereby, drastically reducing
any code collision and unauthorized code
scanning possibilities. SM5038RF is available in
several options to suit every application needs :
variable number of data output pins, latch or
momentary output type.
FEATURES
CMOS Technology
Low Power Consumption
Very High Noise Immunity
Up to 12 2-State Code Address Pins
Wide Range of Operating Voltage:
Vcc = 3 ~ 12 Volts
Single Resistor Oscillator
Available in DIP and SOP Package
APPLICATIONS
Car Security
Garage Door
Home Security/Automation System
Toys
Remote Control for Industrial Use
Page 1
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V1.0
PIN CONFIGURATION ( DIP )
Vcc
VT
OSC1
OSC2
DIN
A11/D0
A10/D1
A9/D2
A8/D3
SM5038RF
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
A0
A1
A2
A3
A4
A5
A6
A7
Vss
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
A0
A1
A2
A3
A4
A5
A6
A7
Vss
NC
Vcc
VT
OSC1
OSC2
DIN
A11/D0
A10/D1
A9/D2
A8/D3
SM5038S
SM5038RF
2
12
RF DECODER
S
AM
H
OP
Microelectronics Corp.
Page 2
V1.0
BLOCK DIAGRAM
Oscillator
Divider
Data Detector
Data Shift
Register
DIN
VT
Sync. Detector
Buffer
Address
VDD VSS
Transmission Gate Circuit
OSC2 OSC1
Comparator
Latch Circuit
.
.
.
.
Data
.
.
.
.
. . . . . . . . . .
Comparator
Control Logic
Buffer
SM5038RF
2
12
RF DECODER
S
AM
H
OP
Microelectronics Corp.
PIN DESCRIPTION
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
PIN NAME
A0
A1
A2
A3
A4
A5
A6
A7
V
SS
D3
D2
D1
D0
DI
OSC1
OSC2
VT
V
DD
I / O
I
I
I
I
I
I
I
I
POWER
O
O
O
O
I
I
O
O
POWER
FUNCTION
Page 3
Address input , each pin can be
set to "0' , "1".
Address/Data output active high.
Negative power supply.
Receive from RF module.
Resistor connected between
these two pins determine the
system clock.
Valid transmission indication.
Positive power supply.
V1.0
SM5038RF
2
12
RF DECODER
S
AM
H
OP
Microelectronics Corp.
Decoder with Data Output Pins
Page 4
Power On
Store Data
Code In?
Address Bits
Matched?
Match
previous stored
data?
3 times
of checking
completed ?
Latch data to
output &
activate VT
NO
YES
YES
YES
NO
Address or
data error?
NO
YES
After Power On SM5038RF is set in
Address search mode, if SM5038RF finds
3 consecutive Address that matches the
Address setting of SM5038RF.
SM5038RF will enter Data Compare
mode. It will compare perviously 3
received data, if they match then
SM5038RF will set VT high and send data
O/P.
V1.0
Standby Mode
YES
Disable VT &
ignore the rest
of this word
NO
NO
SM5038RF
2
12
RF DECODER
S
AM
H
OP
Microelectronics Corp.
Page 5
Single Resistor Oscillator
SM5038RF's oscillator can be constructed by connecting a resistor between OSC1 and
OSC2 pin.
V1.0
Encoder OSC Frequency
350
300
250
200
150
100
50
0
KHz
3 4
5
6
7
8
9 10
11 12 VOLTAGE
100K
82K
68K
51K
43K
150K
180K
The recommended oscillator frequency is F
OSCD
(SM5038RF decoder)=10 F
OSCD
(SM028RF
encoder)
~
SM5038RF
2
12
RF DECODER
S
AM
H
OP
Microelectronics Corp.
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