Datasheet SC9148B, SC9148S Datasheet (SILAN)

Silan

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

ple keyings is possible and 12 commands by the single

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FOR INFRARED REMOTE CONTROL
TRANSMITTER

DESCRIPTION

keys of multi
shot keys.

FEATURES

* Wide operating voltage range(V
* 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.

ODERING INFORMATION

SC9148B Advanced version. All functions same as SC9148. DIP-16 package.
SC9148S Advanced version. SOP-16 package.

BLOCK DIAGRAM

2.2V ~ 5.0V)

DD=

GND

1 16

VDD

SC9148B

SOP-16

DIP-16

XT

XT

K1

K2

K3

OSC Devider

2

3

Decoder

Hold/Single pulse

signalgenerator

4

Key Input Circuit

5

6

7 8 9

K4 K5 K6 T1 T2 T3 CODE

TimingSignal

generating circuit

Output Synthesizing

Circuit

Code Bit signal

Generating Circuit

13121110

Tx

15

OUT

14

TEST

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ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Value Unit

Supply Voltage(Pin 16) V
Input/Output Voltage VIN,V
PowerDissipation P
Operating Temperature Tamb -20 ~ +75
Storage Temperature Tstg -55~+125

DD

D

OUT

Vss-0.3V ~ VDD+0.3V V

6.0 V

200 mW

ELECTRICAL CHARACTERISTICS

Parameter Symbol Test conditions Min Typ Max Unit

Operating Supply Voltage V
Operating supply current I
Quiescent Current comsuption I

CODE
K1~K6 Input

CODE

Input Termianl

TEST
T1~T3 Output

Input
Voltage

Current
Input

Current

Current

“H” Level V
“L” Level V
“H” Level I
“L” Level I
“H” Level I
“L” Level I
“H” Level I

“L” Level I

(Tamb=25°CVDD=3.0V,Unless otherwise specified)

All function operation 2.2 5.0 V

DD

Key ON, without load 1.0 mA

DD

All key OFF stop of OSC 1.0

DS

IH
IL

VIH=3.0V 203060

IH

VIL=0V -1.0 1.0

IL

VIH=3.0V -1.0 1.0

IH

VIL=0V 203060

IL

VOH=2.0V -500

OH

VOL=3.0V 50

OL

SC9148B

°C
°C

2.0 3.0 VK1~K6

00.5V

µA

µA
µA
µA
µA
µA

µA

Tx Output

Current

Output Terminal

OSC Feedback resistor Rf 500
Oscillation frequency f

“H” Level I

“L” Level I

VOH=2.0V -0.1 mA

OH

VOL=3.0V 1.0 mA

OL

OSC

400 455 600 kHz

kΩ

PIN DESCRIPTION

Pin No. Symbol Terminal Function/operation

1,16 GND,VDD Supply Voltage Terminal
2,3 XT, non-XT Termial for OSC Terminal for OSC, and used for connecting a

4~9 K1~K6 Key Input terminal Key input Terminal for key matrix. 18 keys can

10~12 T1~T3 Timing Signal Output

Terminal

13 CODE Code bit input Terminal Terminal for matching code between transmitting

14 Non-TEST Test terminal Keep this terminal open
15 Tx Out Transmitting output terminal Transmitting signal output. Modulation is made

455kHz ceramic resonater etc. (with a built-in
feedback resistor)

be connected at T1~T3 x K1~K6 (with a built-in
pull-down resistor)
Digit timing output terminal for key matrix.

and receiving

by 12 bits 1 cycle and 38kHz carrier wave.

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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.

R

f

2 3

R

2 3

SC9148B

f

C1 C2

C1=C2=50~150pF

C1 C2

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.

T3T2T1

K1

K2

K3

K4

K5

K6

1 7 13

2 8 14

3 9 15

4 10 16

5 11 17

6 12 18

(H) (S1) (S2)

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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.

C1C2C3H S1S2D1D2D3D4D5D6

4. DATA CODE

SC9148B

Key
No.

H S1 S2 D1D2D3D4 D5D6

1 0 0 1 0 0 0 0 0

1

1 0 0 0 1 0 0 0 0

2

1 0 0 0 0 1 0 0 0

3

1 0 0 0 0 0 1 0 0

4

1 0 0 0 0 0 0 1 0

5

1 0 0 0 0 0 0 0 1

6

0 1 0 1 0 0 0 0 0

7

0 1 0 0 1 0 0 0 0

8

DATA

9 0 1 0 0 0 1 0 0 0

As the multiple keying is possible , key No .1~6 are capable of output 63 commands through a combination of

D1~D6data.

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 .

5. CODE BITS(C1,C2,C3)

Code bit can be made at one terminal with diodes connected through T1 ~ T3 timing terminals .

13 12 11 10 9

Output

Form

Continuous
Continuous
Continuous
Continuous
Continuous
Continuous
Single-shot
Single-shot
Single-shot

Key
No.

H S1 S2 D1D2D3 D4 D5D6

0 1 0 0 0 0 1 0 0

10

0 1 0 0 0 0 0 1 0

11

0 1 0 0 0 0 0 0 1

12

0 0 1 1 0 0 0 0 0

13

0 0 1 0 1 0 0 0 0

14

0 0 1 0 0 1 0 0 0

15

0 0 1 0 0 0 1 0 0

16

0 0 1 0 0 0 0 1 0

17
18 0 0 1 0 0 0 0 0 1

CODE BIT

C1 C2 C1,C2 IS FOR

C3 C2 C2,C3 IS FOR

10

T1T2T3CODE

(C3) (C2) (C1)

01

11

DATA

Output

Form

Single-shot
Single-shot
Single-shot
Single-shot
Single-shot
Single-shot
Single-shot
Single-shot
Single-shot

SC9150A

SC9149A

CODE BIT
“0”,”0” CAN
NOT BE USED

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Data of C1 , C2 and C3 code bit become “1” when diodes are connected to CODE Terminal through Timing
Signal Terminals T1 ~T3, and ‘0’ when not connected . (In the above diagram , C1 , C2 and C3 are “1” , “1” and “1”
data . )

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 ‘1’ and
diodes must be so connected .

6. TRANSMITTING WAVEFORM

6.1 BASIC TRANSMITTING WAVEFORM (at fosc=455kHz)

C1~C3: CODE BIT READER
H,S1,S2: HOLD/SINGLE PULSE READER
K1~K6: KEY INPUT READER

C1C2C3 HS1S2K1K2K3K4K5K6

a

3a

Basic transmitting waveform is 12-bits serial data in configuration as shownabove.
The time of each bit “ a” is decided as shown belowby oscillation frequency fosc by means of XT and non-XT.

a=(1/fosc)×192(sec)

48a

SC9148B

6.2 DISTINCTION OF BIT “0” AND “1”

a

BIT "0"

3a

BIT "1"

01 01 0 01 0 01 0 0

One word of the above transmission command is in the configuration of (010100100100).

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6.3 SINGLE-SHOT SIGNAL

Single-shot

KEY ON

60a 48a 80a 48a

Tx OUT

When any one of the single-shot keys is depressed , the above single-shot signal is transmitted in 2 cycles, and
the transmitting output ends.

6.4 CONTINUOUS SIGNAL

Continuous

KEY ON

Tx OUT

When any one of the continuous keys is depressed, the above continuous signal is 2 cycles output, repeatedly
output 208a pause and 2 cycles is 2 pause of 208a.

48a60a 80a 48a 208a 48a 80a 48a

SC9148B

6.5 CARRIER WAVE

About 50~100mA current is normally applied through an infrared LED in order to extend an infrared ray reaching
distance. Therefore, if a time, when LED is ON, is shortened as could as possible , it leads to reduction in power
consumption. On this IC, when single-shot or continuous signal is transmitting, each bit is switching by a carrier of
duty 1/3, output after the pulse modulated.
Carrier(fc) is decided by oscillation frequency fosc by means of XT and non-XT,

fc=fosc/12(Hz), fc=38kHz at fosc=455kHz.

Transmitting

Signal

Pulse Modulated

Transmitting Signal

"1" "0"

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APPLICATION CIRCUIT

SW

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SC9148B

VDD=3V

T1~T3

2SA1015

2SC1815

TLN105

F

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47

¡

10k

¡

10

IN4148

1516 1314 1112 910

VDD Tx OUT CODE T3 T2 T1 K6

TEST

SC9148B

GNDXT K1K2K3K4K5

21 43 65 87

100pF

K1~K6

XT

KEY

MATRIX

100pF

100pF

100pF

1 32 54

7 98 1110

100pF

100pF

100pF

100pF

6

12

13 1514 1716

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PACKAGE OUTLINE

DIP-16-300-2.54 UNIT:mm

2.54

0.25

B

6.35

+0.3

1.52

19.55B0.3

-0

7.62

SC9148B

0.05

B

0.25

15 degree

0.5MIN

0.46B0.08

4.36MAX3.00MIN

1.27MAX

SOP-16-225-1.27 UNIT:mm

1.80MAX

0.3

0.4

B

1.27

10.15B0.25

8.89

B

3.9

6.0

B

0.1

0.4

5.72

+0.05

0.2

-0.02

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Attach

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SC9148B

Revision History

Data REV Description Page

2000.12.31 1.0 Original

2002.05.27 2.0

2002.09.10 2.1 Modify the “APPLICATION CIRCUIT” 7

Modify the “SC9148A” to “SC9148B”
Modify the “PACKAGE OUTLINE” 8

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