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8 9

10 A7/D4 Vss A8/D3 I / O POWER I / O

11 12 A9/D2 A10/D1 I / O I / O

13 A11/D0 I / O

14 DIN I Receive from Rf module. Page

4 OCT. 26,

2001 I

15 OSC1 Resistor connected between these two pins determine the system clock.

16 OSC2

17 VT Valid transmission indication.

18 VDD Positive power supply. I O O POWER PIN FUNCTION No. Pin Name I/O Function Negative power supply. SM5272B

312 RF DECODER SAMHOP Microelectronics Corp. 三合微科股份有限公司 Page

5 OCT. 26,

2001 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 SM5272B-M2/L2 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 SYNC A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 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 SM5272B-M3/L3 A0 A1 A2 A3 A4 A5 A6 A7 A8 D2 D1 D0 SYNC SM5272B

312 RF DECODER SAMHOP Microelectronics Corp. 三合微科股份有限公司 Page

6 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. 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. 1st Address S 2nd Address S VT DIN OCT. 26,

2001 DIN DATA WORDS DATA WORDS T T DATA OUTPUT X DATA OUTPUT Y DATA PINS (Momentary) DATA OUTPUT X DATA OUTPUT Y DATA PINS (Latch) VT T=

2 CODE WORD WIDTH SM5272B

312 RF DECODER SAMHOP Microelectronics Corp. 三合微科股份有限公司 Page

7 OCT. 26,

2001 OPERATION FLOWCHART 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. 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. Power ON Address match? Set VT Address match? Address match? Address match? Disable VT NO YES YES NO YES YES NO NO SM5272B

312 RF DECODER SAMHOP Microelectronics Corp. 三合微科股份有限公司 Page

8 OCT. 26,

2001 DECODER WITH DATA OUTPUT PINS 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. SM5272B re-enters Address search mode, after

2 consecutive Address that do not match setting on SM5272B will disable VT and momentary's data but keep Latch's data intact. Power ON Address match? Address match? YES YES NO NO Data match? Address match? Address match? Disable VT and Remove the Momentary data. But keep the Latch Type data intact. NO YES YES NO NO Active VT and O/P data YES SM5272B