SC9148B
INFRARED REMOTE CONTROL TRANSMITTER USED TOGETHER WITH
SC9149
DESCRIPTION
The SC9148B is CMOS LSI developed for use on the infrared remote
control transmitter. This LSI has 18 functions, and total 75 commands
can be transimitted : 63 commands by the continuous keys of multiple
keyings is possible and 12 commands by the single shot keys.
FEATURES
* Wide operating voltage range(V
DD
=2.2V ~ 5.0V)
* CMOS structure assures extremely low power dissipation
* Mulitiple keying is possible
* Less external parts
* Adaptable to other Models as Code Bits are available
* An oscillator can be constructed only by connecting an LC or
Ceramic Resonater as the oscillation circuit is housed.
ORDERING INFORMATION
Device
SC9148B
SC9148S
Package
DIP-16-300-2.54
SOP-16-225-1.27
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15
Page 1 of 10
SC9148B
ABSOLUTE MAXIMUM RATING
Characteristics
Supply Voltage(Pin 16)
Input/Output Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
V
DD
V
IN
,V
OUT
P
D
T
amb
Ts
tg
Ratings
6.0
V
SS-
0.3V ~ V
DD
+0.3V
200
-20 ~ +75
-55~+125
Unit
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(T
amb
=25°C,V
DD
=3.0V,Unless otherwise specified)
Characteristics
Operating Supply Voltage
Operating Supply Current
Quiescent Current Comsuption
K1~K6
Input Termianl
CODE
K1~K6
Input
“ Level
H”
Voltage “ Level
L”
Input
“ Level
H”
Current “ Level
L”
CODE
TEST
T1~T3
Terminal
Output
Input
“ Level
H”
Current “ Level
L”
Output
“ Level
H”
Current “ Level
L”
Output
“ Level
H”
Current “ Leve
L”
Symbol
V
DD
I
DD
I
DS
V
IH
V
IL
I
IH
I
IL
I
IH
I
IL
I
OH
I
OL
I
OH
I
OL
R
f
f
OSC
400
V
IH
=3.0V
V
IL
=0V
V
IH
=3.0V
V
IL
=0V
V
OH
=2.0V
V
OL
=3.0V
V
OH
=2.0V
V
OL
=3.0V
Test conditions
All function operation
Key ON, without load
All key OFF stop of OSC
2.0
0
20
-1.0
-1.0
20
-500
50
-0.1
1.0
500
455
600
30
30
Min.
2.2
Typ.
Max.
5.0
1.0
1.0
3.0
0.5
60
1.0
1.0
60
Unit
V
mA
µA
V
V
µA
µA
µA
µA
µA
µA
mA
mA
kΩ
kHz
Tx
OSC Feedback resistor
Oscillation frequency
PIN DESCRIPTION
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
SC9148B
REV:2.1
2005.12.15
Page 2 of 10
SC9148B
PIN DESCRIPTION
Pin No.
1,16
2,3
Symbol
GND,V
DD
XT, non-XT
Termial for OSC
Terminal
Function/operation
Supply Voltage Terminal
Terminal for OSC, and used for connecting a
455kHz ceramic resonater etc. (with a built-in
feedback resistor)
Key input Terminal for key matrix. 18 keys can
4~9
K1~K6
Key Input terminal
Timing Signal Output
Terminal
Code bit input Terminal
Test terminal
Transmitting
terminal
output
be connected at T1~T3 x K1~K6 (with a built-in
pull-down resistor)
10~12
13
14
15
T1~T3
CODE
Non-TEST
Tx Out
Digit timing output terminal for key matrix.
Terminal for matching code between transmitting
and receiving
Keep this terminal open
Transmitting signal output. Modulation is made
by 12 bits 1 cycle and 38kHz carrier wave.
FUNCTIONAL DESCRIPTION
1. OSCILLATION CIRCUIT
As the self-bias type amplifier by means of CMOS inverter has been housed, the oscillation circuit can be
constructed when LC or ceramic resonater is connected.
When oscillation frequency is set at 455kHz, carrier wave of transmitting signal is set at 38kHz, oscillation of
the oscillation circuit is kept stopped unless the keys are operated, thus reducing power consumption.
2. KEY INPUT
18 keys can be connected by key input K1~K6 and 6
×3
matrix by means of timing signal T1~T3 .
Multiple keying is possible for the keys connected to T1 line up to sextet, and all key inputs are output . (Output
becomes continuous pulses.)
Between the timing signal lines, priority has been decided in order of T1, T2, T3. The keys connected to T2
and T3 lines have priority and input is made through more than 2 keys, single signal is preferentially output in
order of K1~K6.
Further, the keys connected to T2 and T3 lines are for single and not second signal is transmitted unless input
is made again after the key is released once.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15
Page 3 of 10
SC9148B
KEY MATRIX
Key No.1~6
Continuous key output with it pressed, and multiple keying is possible.
Key No.7~18
These keys are the single-shot keys and when input is made, signal is output only one time.
3. TRANSMISSION COMMAND
Transmission command is in one word 12-bits configuration. C1~C3 are code bits adaptable to many models,
H,S1 and S2 continous signal and single-shot signal codes ,and D1~D6 are Key input data codes in 6-bits.
C1
C2
C3
H
S1
S2
D1
D2
D3
D4
D5
D6
4. DATA CODE
Key
No.
1
2
3
4
5
6
7
8
9
DATA
H S1 S2 D1 D2 D3 D4 D5 D6
Output
Form
Key
No.
10
11
12
13
14
15
16
17
18
DATA
H S1 S2 D1 D2 D3 D4 D5 D6
Output
Form
1 0 0 1 0 0 0 0 0
Continuous
1 0 0 0 1 0 0 0 0
Continuous
1 0 0 0 0 1 0 0 0
Continuous
1 0 0 0 0 0 1 0 0
Continuous
1 0 0 0 0 0 0 1 0
Continuous
1 0 0 0 0 0 0 0 1
Continuous
0 1 0 1 0 0 0 0 0
Single-shot
0 1 0 0 1 0 0 0 0
0 1 0 0 0 1 0 0 0
Single-shot
Single-shot
0 1 0 0 0 0 1 0 0
Single-shot
0 1 0 0 0 0 0 1 0
Single-shot
0 1 0 0 0 0 0 0 1
Single-shot
0 0 1 1 0 0 0 0 0
Single-shot
0 0 1 0 1 0 0 0 0
Single-shot
0 0 1 0 0 1 0 0 0
Single-shot
0 0 1 0 0 0 1 0 0
Single-shot
0 0 1 0 0 0 0 1 0
Single-shot
0 0 1 0 0 0 0 0 1
Single-shot
As the multiple keying is possible , key No .1~6 are capable of output 63 commands through a combination of
D1~D6 data .
Key No . 7~18 are the single-shot keys for output 12 commands , and 75 commands can be output through a
combination of continuous key (multiple keying is possible ) and single-shot key .
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15
Page 4 of 10
SC9148B
5. CODE BITS(C1,C2,C3)
Code bit can be made at one terminal with diodes connected through T1 ~ T3 timing terminals .
CODE BIT
C1
C3
1
0
1
C2
C2
0
1
1
C1,C2 IS FOR SC9150A
C2,C3 IS FOR SC9149A
CODE BIT “ ,” CAN NOT
0” 0”
BE USED
Data of C1 , C2 and C3 code bit become “ when diodes are connected to CODE Terminal through Timing
1”
Signal Terminals T1 ~T3, and ‘ when not connected . (In the above diagram , C1 , C2 and C3 are “ , “ and
0’
1” 1”
“ data . )
1”
The SC9148P has 3 code bits . However , the SC9149P that is a receiving IC ( DIP 16 PIN ) and the SC9150P
(DIP 24 PIN ) are able to use only C2 and C3 , and C1 and C2 2 code bits , respectively .
Therefore , diodes must be connected so that code bit data of the SC9148P agreement with the receiving IC .
Note:For
C3 and C1 code bit data not used on the SC9150P and SC9149P , it is necessary to transmit ‘ and
1’
diodes must be so connected .
6. TRANSMITTING WAVEFORM
6.1 BASIC TRANSMITTING WAVEFORM (at fosc=455kHz)
Basic transmitting waveform is 12-bits serial data in configuration as shown above.
The time of each bit “a”is decided as shown below by oscillation frequency fosc by means of XT and non-XT.
a=(1/fosc)×192(sec)
6.2 DISTINCTION OF BIT “0” AND “1”
One word of the above transmission command is in the configuration of (010100100100).
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15
Page 5 of 10
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