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| SM5172 SAMHOP Microelectronics Corp. 312 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 312) 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 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER PIN ASSIGNMENTS ( DIP ) A0 A1 A2 A3 A4 A5 A6 A7 Vss 1 2 3 4 5 6 7 8 9 SM5172 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 SM5172-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 SM5172-M3/L3 SM5172-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 SM5172-M5/L5 Page 2 SM5172M6/L6 OCT. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER PIN CONFIGURATION ( SOP ) A0 A1 A2 A3 A4 A5 A6 A7 Vss NC 1 2 3 4 5 6 7 8 9 10 SM5172S 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 SM5172S-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 SM5172S-M3/L3 SM5172S-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 SM5172S-M5/L5 Page 3 SM5172S-M6/L6 OCT. 2001 SM5172 SAMHOP Microelectronics Corp. 312 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 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. 2001 SM5172 SAMHOP Microelectronics Corp. 312 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 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER Valid Transmission After Power On SM5172 enters the Search Address mode, if SM5172 finds 2 consecutive Address that matches the Address Pin setting of SM5172 then it will set VT high. If VT is set high, SM5172 is still in search Address. After 2 consecutive Address that do not match the setting on SM5172, SM5172 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 SM5172 is set in Address search mode, if SM5172 finds 2 consecutive Address that matches the Address setting of SM5172. SM5172 will enter Data Compare mode. It will compare perviously 2 receive data, if they match each then SM5172 will set VT high and send data O/P. SM5172 re-enters Address search mode, after 2 consecutive Address that do not match the setting on SM5172 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. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER OPERATION FLOWCHART Power ON NO Address match? YES After Power On SM5172 enters the Search Address mode, if SM5172 finds 2 consecutive Address that matches the Address Pin setting of SM5172, it will set VT high. NO Address match? YES Set VT It VT is set high, SM5172 is still in search Address. After 2 consecutive Address that do not match the setting on SM5172, SM5172 will disable VT. YES Address match? NO YES Address match? NO Disable VT Page 7 OCT. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER DECODER WITH DATA OUTPUT PINS Power ON NO Address match? YES NO Address match? YES After Power On SM5172 is set in Address search mode, if SM5172 finds 2 consecutive Address that matches the Address setting of SM5172. SM5172 will enter Data Compare mod. It will compare previously 2 received data, if they match then SM5172 will set VT high and send data O/ P. NO Data match? YES Active VT and O/P data YES SM5172 re-enters Address search mode, after 2 consecutive Address that do not match setting on SM5172 will disable VT and 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. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER Single Resistor Oscillator SM5172's oscillator be constructed by connecting a resistor between OSC1 and OSC2 pin. SM5172's OSC frequency must be 1.8 to 5.8 times more than SM5162. Encoder OSC Frequency 100 90 80 70 60 KHz 50 40 30 20 10 0 3 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 Dncoder OSC Frequency 300 R = 100 K 250 200 110 KHz 100 R = 300 K 50 R = 620 K R = 680 K R = 820 K R = 1.0 M 0 3 6 9 12 15 VOLTAGE Suggested oscillator resistor of SM5162/ SM5172: SM5162 4.7M OHM 3.0M OHM 2.2M OHM 1.2M OHM Page 9 SM5172 820K OHM 620K OHM 300K OHM 180K OHM OCT. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER 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 = 8V VOH = 6.4V Vcc = 12V VOH = 9.6V Vcc = 5V VOH = 1V Data Output Sinking Current IOL Vcc = 8V VOH = 1.6V Vcc = 12V VOH = 2.4V -4 -8 -15 6 14 26 Conditions Limit Min. Typ. Max. 3 12 Unit V Standby Current ISTB 0.02 0.3 g A mA mA mA mA mA mA Page 10 OCT. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER APPLICATION CIRCUIT RF Receiver A0 A1 A2 A3 A4 A5 A6 A7 Vss VDD VT OSC1 OSC2 DIN A11 A10 A9 A8 SM5172 ROSC VT Page 11 OCT. 2001 SM5172 SAMHOP Microelectronics Corp. 312 RF ENCODER ORDERING INFORMATION Part No. SM5172 Package 18 Pin DIP Part No. SM5172S 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 SM5172 S - X X xxx xx Serial Number Date Code ESD Protection Mark Page 12 OCT. 2001 |
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