FEATURES
* Paired with SM5022IR,
SM5033A/AL provides 10-key IR remote control
system.
* Multi-Key control signal
SM5033A/AL provides up to 5 multi-key control signal.
* Output signal of single pulse (SP), hold pulse (HP) and
cyclic pulse (CP)
(only SM5033AL provides 2 CP function)
* Oscillator constructed by RC circuit
* Custom code prevents interference from other appliance.
* High noise immunity
APPLICATION
Remote control for TV, Hi-Fi, Toy and VCR
BLOCK DIAGRAM
OSC
DIGITAL
FILTER
OUTPUT BUFFER
SHIFT REGISTER
Vcc
Vss
HP1
HP2
HP3
HP4
RXIN
CODE2
CODE1
Page 1
OSC
Vss
RXIN
HP1
HP2
HP3
HP4
HP5
CP2
Vcc
OSC
CODE2
CODE3
SP1
SP2
SP3
CP1
SM5033AL
HP5
CP2
CP1
SP5
SP4
SP3
SP2
SP1
V.1.0
Vss
RXIN
HP1
HP2
HP3
HP4
HP5
SP5
Vcc
OSC
CODE2
CODE3
SP1
SP2
SP3
SP4
SM5033A
PIN ASSIGNMENTS
SM5033A/AL
S
AM
H
OP
Microelectronics Corp.
IR DEODER
Symbol
PIN DESCRIPTION
Pin Number
FUNCTION DESCRIPTION
(1) Oscillating Circuit
A stable oscillator is constructed by parallely connecting R and C between the
built-in oscillating circuit and VSS.
OSC
R
C
OSC
R : 39K 5%
C : 1000P 5%
+
_
+
_
Page 2
Figure 1
VSS
RXIN
HP1 ~ HP5
CP1 ~ CP2
SP1 ~ SP5
CODE2
CODE3
OSC
VCC
SM5033A
SM5033AL
1
2
3 ~ 7
8 ~ 9
10 ~ 12
13
14
15
16
8 ~ 12
I/O
-
I
O
O
O
I
I
I/O
-
Description
Negative Power Supply
Remote signal in
HP Control signal output
CP Control signal output
SP Control signal output
Custom code setting
RC oscillating circuit input port
VER 1.0,NOV. 2000
Positive Power Supply
SM5033A/AL
S
AM
H
OP
Microelectronics Corp.
IR DEODER
(2) IR/RF Receiving
A Schmitt circuit for shaping receiving signal waveform is built-in to eliminate rounding.
(3) Receiving Signal checking
The receiving signal is checked by means of storing the 1st frame of transmitting signal in
a 12-bit shift register and then, when the second frame data is put into the shift register,
1st frame data in the shift register is forced out by ont bit.
This bit is compared with the incoming bit to determine whether the receiving signal is
correct or not.
2
RXIN
IR/RF RECEIVING
MODULE
Figure 2
12 BITS
12 BITS
FIRST DATA
SECOND DATA
RECEIVING SIGNAL
Figure 3
(4) Custom Code
C1, C2 and C3 provide custom code setting. When coding of transmitter and receiver is
the same, internal latch strobe pulse is generated to latch received data and output is
effected.
Page 3
VER 1.0,NOV. 2000
SM5033A/AL
S
AM
H
OP
Microelectronics Corp.
IR DEODER
(5) Output Signal
(a) SP1~SP5 (Single pulse)
Transmitter key pressed
Received signal
Latch strobe pulse
Single shot output
Figure 4
(b) HP1~HP5 (Hold Pulse)
Transmitter key pressed
Received signal
Latch strobe pulse
Hold pulse output
107 mSEC
12 BITS 12 BITS
12 BITS 12 BITS
160 mSEC
Figure 5
HP signal is specially used in volume control.
Multi-key signal generated by HP key can be used in REC-PLAY, REC-PAUSE and
CUE/REVIEW function.
(C) CP1, CP2 (Cyclic Pulse)
Figure 6
Transmitter key pressed
Received signal
Latch strobe pulse
Cyclic pulse output
Cyclic pulse signal is specially used for ON/OFF, MUTE control.
Page 4
12 BITS
12 BITS
VER 1.0,NOV. 2000
SM5033A/AL
S
AM
H
OP
Microelectronics Corp.
IR DEODER
(6) Code Allocation
Data Bit
T1 T2 T3 K1 K2 K3 K4 K5 K6
Output signal
SM5033A and SM5033B
Continuous Signal HP1
Continuous Signal HP2
Continuous Signal HP3
Continuous Signal HP4
Continuous Signal HP5
Continuous Signal HP6
Single shot signal SP1
Single shot signal SP2
Single shot signal SP3
Single shot signal SP4
Single shot signal SP5
Cyclic signal CP1
Cyclic signal CP2
Page 5
Key no.
of
SM5022
1
2
3
4
5
6
7
8
9
10
11
17
18
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VER 1.0,NOV. 2000
SM5033A/AL
S
AM
H
OP
Microelectronics Corp.
IR DEODER
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