View SC9148B_4627507.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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(VDD=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 VDD VIN,VOUT PD Tamb Tstg Ratings 6.0 VSS-0.3V ~ VDD+0.3V 200 -20 ~ +75 -55~+125 Unit V V mW C C
ELECTRICAL CHARACTERISTICS(Tamb=25C,VDD=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 VDD IDD IDS VIH VIL IIH IIL IIH IIL IOH IOL IOH IOL Rf fOSC 400 VIH=3.0V VIL=0V VIH=3.0V VIL=0V VOH=2.0V VOL=3.0V VOH=2.0V VOL=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 A V V A A A A A A mA mA k 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,VDD 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 x3 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 100000001 010100000 010010000 010001000
Continuous Single-shot 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)x192(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
SC9148B
6.3 SINGLE-SHOT SIGNAL
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
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. 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.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15 Page 6 of 10
SC9148B
APPLICATION CIRCUIT
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15 Page 7 of 10
SC9148B
PACKAGE OUTLINE
DIP-16-300-2.54 UNIT:mm
SOP-16-225-1.27
UNIT:mm
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15 Page 8 of 10
SC9148B
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
Note: IC oscillator input mustn't be on the outside layer, thus to avoid the abnormal working when human body touches the remote controller without crust in testing.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.1
2005.12.15 Page 9 of 10

▲Up To Search▲

Price & Availability of SC9148B

	To Download SC9148B Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .