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SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
GENERAL DESCRIPTION
SM5272B is a remote control decoder paired with SM5262B utilizing CMOS Technology. It has 12-bit tri-state address pins providing a maximum of 531,411 (or 312) address codes; thereby, drastically reducing any code collision and unauthorized code scanning possibilities. SM5272B 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= 2.5 ~ 9 Volts * Single resistor oscillator * Latch or momentary output type * Available in DIP and SOP package
APPLICATIONS
* Garage door * 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. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
PIN ASSIGNMENTS ( DIP )
A0 A1 A2 A3 A4 A5 A6 A7 Vss
1 2 3 4 5 6 7 8 9 SM5272B
18 17 16 15 14 13 12 11 10
Vcc VT OSC1 OSC2 DIN A11 A10 A9 A8
A0 A1 A2 A3 A4 A5 A6 A7 Vss
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
Vcc VT OSC1 OSC2 DIN D0 D1 A9 A8
SM5272B-M2/L2
A0 A1 A2 A3 A4 A5 A6 A7 Vss
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
Vcc VT OSC1 OSC2 DIN D0 D1 D2 A8
A0 A1 A2 A3 A4 A5 A6 A7 Vss
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
Vcc VT OSC1 OSC2 DIN D0 D1 D2 D3
SM5272B-M3/L3
SM5272B-M4/L4
A0 A1 A2 A3 A4 A5 A6 D4 Vss
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
Vcc VT OSC1 OSC2 DIN D0 D1 D2 D3
A0 A1 A2 A3 A4 A5 D5 D4 Vss
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
Vcc VT OSC1 OSC2 DIN D0 D1 D2 D3
SM5272B-M5/L5 Page 2
SM5272BM6/L6 OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
PIN CONFIGURATION ( SOP )
A0 A1 A2 A3 A4 A5 A6 A7 Vss NC 1 2 3 4 5 6 7 8 9 10 SM5272BS 20 19 18 17 16 15 14 13 12 11 Vcc VT OSC1 OSC2 DIN A11 A10 A9 A8 NC A0 A1 A2 A3 A4 A5 A6 A7 Vss NC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 Vcc VT OSC1 OSC2 DIN D0 D1 A9 A8 NC
SM5272BS-M2/L2
A0 A1 A2 A3 A4 A5 A6 A7 Vss NC
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
Vcc VT OSC1 OSC2 DIN D0 D1 D2 A8 NC
A0 A1 A2 A3 A4 A5 A6 A7 Vss NC
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
Vcc VT OSC1 OSC2 DIN D0 D1 D2 D3 NC
SM5272BS-M3/L3
SM5272BS-M4/L4
A0 A1 A2 A3 A4 A5 A6 D4 Vss NC
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
Vcc VT OSC1 OSC2 DIN D0 D1 D2 D3 NC
A0 A1 A2 A3 A4 A5 D5 D4 Vss NC
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
Vcc VT OSC1 OSC2 DIN D0 D1 D2 D3 NC
SM5272BS-M5/L5 Page 3
SM5272BS-M6/L6 OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
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 VDD 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. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
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 SM5272B version used. Please refer to the diagrams below:
SM5272B A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 SYNC
SM5272B-M2/L2 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D1 D0 SYNC
SM5272B-M3/L3 A0 A1 A2 A3 A4 A5 A6 A7 A8 D2 D1 D0 SYNC
SM5272B-M4/L4 A0 A1 A2 A3 A4 A5 A6 A7 D3 D2 D1 D0 SYNC
SM5272B-M5/L5 A0 A1 A2 A3 A4 A5 A6 D4 D3 D2 D1 D0 SYNC
SM5272B-M6/L6 A0 A1 A2 A3 A4 A5 D5 D4 D3 D2 D1 D0 SYNC
One Complete Code Word
Page 5
OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
Valid Transmission After Power On SM5272B enters the Search Address mode, if SM5272B finds 2 consecutive Address that matches the Address Pin setting of SM5272B then it will set VT high. If VT is set high, SM5272B is still in search Address. After 2 consecutive Address that do not match the setting on SM5272B, SM5272B will disable VT. The timing are shown in the following diagram. DIN VT
1st Address S 2nd Address S
Latch or Momentary Data Output Type After Power On SM5272B is set in Address search mode, if SM5272B finds 2 consecutive Address that matches the Address setting of SM5272B. SM5272B will enter Data Compare mode. It will compare perviously 2 receive data, if they match each then SM5272B will set VT high and send data O/P. SM5272B re-enters Address search mode, after 2 consecutive Address that do not match the setting on SM5272B will disable VT and momentary's data but keep Latch's data intact.
DATA WORDS
DATA WORDS
DIN
T T
DATA OUTPUT Y
DATA PINS
(Momentary)
DATA OUTPUT X
DATA PINS (Latch)
DATA OUTPUT X
DATA OUTPUT Y
VT T= 2 CODE WORD WIDTH
Page 6
OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
OPERATION FLOWCHART
Power ON
NO
Address match? YES
After Power On SM5272B enters the Search Address mode, if SM5272B finds 2 consecutive Address that matches the Address Pin setting of SM5272B, it will set VT high.
NO
Address match? YES Set VT
It VT is set high, SM5272B is still in search Address. After 2 consecutive Address that do not match the setting on SM5272B, SM5272B will disable VT.
YES
Address match? NO
YES
Address match? NO Disable VT
Page 7
OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
DECODER WITH DATA OUTPUT PINS
Power ON
NO
Address match? YES
NO
Address match? YES
After Power On SM5272B is set in Address search mode, if SM5272B finds 2 consecutive Address that matches the Address setting of SM5272B. SM5272B will enter Data Compare mod. It will compare previously 2 received data, if they match then SM5272B will set VT high and send data O/P.
NO
Data match? YES Active VT and O/P data
YES
SM5272B re-enters Address search mode, after 2 consecutive Address that do not match setting on S M 5 2 7 2 B w i l l d i s a b l e V T a n d momentary's data but keep Latch's data intact.
Address match? NO
YES
Address match? NO
Disable VT and Remove the Momentary data. But keep the Latch Type data intact.
Page 8
OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
Single Resistor Oscillator SM5272B's oscillator be constructed by connecting a resistor between OSC1 and OSC2 pin. SM5272B's OSC frequency must be 1.4 to 6.8 times more than SM5262B. Encoder OSC Frequency
100 90 80 70 60 KHz 50 40 30 20 10 0
2.5 6 9 12
R = 2.7 M R = 3.0 M R = 3.3 M R = 4.3 M R = 1.2 M R = 510K
15 VOLTAGE
Decoder OSC Frequency
300 250 200 180 KHz 100
R = 300 K R = 100 K
50
R = 620 K R = 680 K R = 820 K R = 1.0 M
0
2.5
6
9
VOLTAGE
Suggested oscillator resistor of SM5262B/ SM5272B: SM5262B 4.7M OHM 3.0M OHM 2.2M OHM 1.2M OHM Page 9 SM5272B 750K OHM 390K OHM 270K OHM 160K OHM OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
DC ELECTRICAL CHARACTERISTICS
Parameter Supply Voltage Symbol VCC Vcc = 12 V OSC stop A0 ~ A11 open Vcc = 5V VOH = 4V Data Output Driving Current IOH Vcc = 9V VOH = 7.2V -7.1 mA Conditions Limit Min. Typ. Max. 2.5 9 Unit V
Standby Current
ISTB
0.02
0.3
g A
-3.5
mA
Vcc = 5V VOH = 1V Data Output Sinking Current IOL Vcc = 9V VOH = 1.8V
8
mA
20
mA
Page 10
OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
APPLICATION CIRCUIT
RF Receiver
A0 A1 A2 A3 A4 A5 A6 A7 Vss
VDD VT OSC1 OSC2 DIN A11 A10 A9 A8 SM5272B ROSC VT
Page 11
OCT. 26, 2001
SM5272B
SAMHOP Microelectronics Corp.
312 RF DECODER
ORDERING INFORMATION
Part No. SM5272B
Package 18 Pin DIP
Part No. SM5272BS
Package 20 Pin SOP
Logo Product No. Empty: DIP TYPE S: SO Package M:Momentary type L: Latch type None: 0 Data Bits 2:Two Data Bits 3:Three Data Bits 4:Four Data Bits 5:Five Data Bits 6:Six Data Bits
SM5272B S - X X
xxx xx
Serial Number
Date Code
ESD Protection Mark
Page 12
OCT. 26, 2001

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