ST12 SunRom, ST12 Datasheet - Page 3

• Manufacturer Part Number: ST12
• Description: IR/RF Remote Control Encoder/Decoder IC
• Manufacturer: SunRom

7.
Encoder address pins A0-A3 must be set to the same logic levels as decoder address pins A0-A3. If
these do not match, the decoder will ignore data sent from the encoder. The decoder receives two
consecutive & matching data/address packets before transferring data to the D0-D7 outputs.
Each 13-bit packet transmit time requires approximately 48mS. Care should be taken not to violate these
timing requirements when the ST12 is controlled by high-speed logic circuits or embedded controllers
such as the PIC, BASIC Stamp or 8051.
Important: Address input pins A0-A3 & configuration selection input must always be connected to Vdd
or circuit ground depending on the mode required. Allowing any of these input pins to “float” (leaving
them un-connected) will cause erratic results.
8.
© 2006 Sunrom Technologies
www.DataSheet4U.com
SW1
SW2
SW3
SW4
9V Battery
CN1
SIP2
Data & Address Validation
Transmitter Application Schematic (Encoder)
2
1
SW
SW
SW
SW
1N4007
D2
C2
100n
1
2
3
4
5
6
7
8
9
3
U1
ST12 CODEC
U3
LM78L05
IN
A0
A1
A2
A3
GND
D0
D1
D2
D3
MODE IR - RF
GND
LATCH - MOM
DATA RX - TX
ENC - DEC
OUT
VCC
1
VCC
D7
D6
D5
D4
C3
100n
18
17
16
15
14
13
12
11
10
http://www.sunrom.com
Title
Code
Date:
Sunrom Technologies
8 Channel Remote Transmitter
1001-3487
Monday , May 01, 2006
C1
100n
VCC
SW5
SW6
SW7
SW8
VCC
VCC
SW
SW
SW
SW
JUMPER3P
IR
RF
R1
J1
10K
http://ww w.sunrom.com
4K7
Q1
BC547
R2
ANTENNA
Sheet
E1
U2 STT-315
1
VCC
Rev
IR LED
Q2
BC547
of
D1
C4
100n
1
3
RF
1
VCC
IR
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