SAMHOP Microelectronics Corp.
3
12
RF DECODER
SM5172
Valid Transmission
After Power On SM5172 enters the search Address mode, if SM5172 finds 2 consecutive Adress that matches
d
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 con
secutive Address that do not match the setting
on SM5172, SM5172 will disable VT.
The timing are shown in the following diagram.
1st Address
S
2nd Address
S
DIN
VT
Latch or Momentary Data Output Type
After Power On SM5172 is set in search Address m
ode, if SM5172 finds 2 consecutive Address that matches
the Address setting of SM5172. SM5172 will enter DataCompare 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 search Address mode, after 2 consecutive Address that do not mat the setting on SM5172
ch
will disable VT and momentary's data but keep Latch's data intact.
DATA WORDS
DIN
T
DATA PINS
(Momentary)
DATA PINS
(Latch)
DATA OUTPUT X
T
DATA OUTPUT Y
DATA WORDS
DATA OUTPUT X
DATA OUTPUT Y
VT
T= 2 CODE WORD WIDTH
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