三合微科股�½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5272B
3
12
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
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
