三合微科股½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5172
3
12
RF ENCODER
GENERAL DESCRIPTION
SM5172 is a remote control decoder paired
with SM5162 utilizing CMOS Technology. It
has 12-bit tri-state address pins providing a
maximum of 531,411 (or 3
12
) address codes;
thereby, drastically reducing any code
collision and unauthorized code scanning
possibilities. SM5172 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 tri-State code address pins
* Up to 6 data pins
* Wide range of operating voltage:
Vcc= 3 ~ 12 Volts
* Single resistor oscillator
* Latch or momentary output type
* Available in DIP and SOP package
APPLICATIONS
* Car security
* Garage door
* Home security/Automation system
* Toys
* Remote control for industrial use
BLOCK DIAGRAM
DIN
Signal
Re-Shap
Decode
Timing
Generator
Address
Compare
Data
Compare
VT
OSC
Address
Data
OSC1 OSC2
A0
A5
A6/D5 A11/D0
Page 1
OCT. 2001
三合微科股½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5172
3
12
RF ENCODER
PIN FUNCTION
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/D5
A7/D4
Vss
A8/D3
A9/D2
A10/D1
A11/D0
DIN
OSC1
OSC2
VT
V
DD
I/O
I
I
I
I
I
I
I/O
Address input or data output.
I/O
POWER
I/O
I/O
Address input or data output.
I/O
I/O
I
I
O
O
POWER
Receive from Rf module.
Resistor connected between these two pins
determine the system clock.
Valid transmission indication.
Positive power supply.
Negative power supply.
Address input, each pin can be set to "0",
"1" , or floating.
Function
Page 4
OCT. 2001
三合微科股½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5172
3
12
RF ENCODER
Code Word
A group of Code Bits is called a code Word. A Code Word consists of 12 Address plus Data
bits followed by one Sync Bit. The 12 AD bits are interpreted as either address or data bits
depending on the SM5172 version used. Please refer to the diagrams below:
SM5172
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10 A11
SYNC
SM5172-M2/L2
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
D1
D0
SYNC
SM5172-M3/L3
A0
A1
A2
A3
A4
A5
A6
A7
A8
D2
D1
D0
SYNC
SM5172-M4/L4
A0
A1
A2
A3
A4
A5
A6
A7
D3
D2
D1
D0
SYNC
SM5172-M5/L5
A0
A1
A2
A3
A4
A5
A6
D4
D3
D2
D1
D0
SYNC
SM5172-M6/L6
A0
A1
A2
A3
A4
A5
D5
D4
D3
D2
D1
D0
SYNC
One Complete Code Word
Page 5
OCT. 2001
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