三合微科股�½有限公司
S
AM
H
OP
Microelectronics Corp.
SM5172
3
12
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
SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
