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 Package SC9148B DIP-16-300-2.54 SC9148S 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 Symbol Ratings Unit VDD 6.0 V VIN,VOUT VSS-0.3V ~ VDD+0.3V V PD 200 mW Operating Temperature Tamb -20 ~ +75 °C Storage Temperature Tstg -55~+125 °C Supply Voltage(Pin 16) Input/Output Voltage Power Dissipation ELECTRICAL CHARACTERISTICS(Tamb=25°C,VDD=3.0V,Unless otherwise specified) Characteristics Symbol Test conditions Min. Typ. Unit 5.0 V All function operation Operating Supply Current IDD Key ON, without load 1.0 mA Quiescent Current Comsuption IDS All key OFF stop of OSC 1.0 µA Input Termianl VDD K1~K6 Input “H”Level VIH 2.0 3.0 V CODE Voltage “L”Level VIL 0 0.5 V K1~K6 Input “H”Level IIH VIH=3.0V 60 µA Current “L”Level IIL VIL=0V -1.0 1.0 µA CODE Input “H”Level IIH VIH=3.0V -1.0 1.0 µA TEST Current “L”Level IIL VIL=0V 60 µA T1~T3 Output “H”Level IOH VOH=2.0V -500 µA Terminal Operating Supply Voltage Output 2.2 Max. Current “L”Level IOL VOL=3.0V 50 µA Output IOH VOH=2.0V -0.1 mA IOL VOL=3.0V 1.0 mA Tx “H”Level Current “L”Leve OSC Feedback resistor Oscillation frequency 20 20 Rf 30 30 500 fOSC 400 455 kΩ 600 kHz PIN DESCRIPTION SC9148B HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:2.1 2005.12.15 Page 2 of 10 SC9148B PIN DESCRIPTION Pin No. Symbol 1,16 GND,VDD Terminal Function/operation Supply Voltage Terminal Terminal for OSC, and used for connecting a 2,3 XT, non-XT Termial for OSC 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 be connected at T1~T3 x K1~K6 (with a built-in pull-down resistor) 10~12 T1~T3 13 CODE 14 Non-TEST 15 Tx Out Timing Signal Output Terminal Code bit input Terminal Test terminal Transmitting Digit timing output terminal for key matrix. Terminal for matching code between transmitting and receiving Keep this terminal open output terminal 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. DATA H S1 S2 D1 D2 D3 D4 D5 D6 Output Form Key No. DATA H S1 S2 D1 D2 D3 D4 D5 D6 Output Form 1 2 1 0 0 1 0 0 0 0 0 Continuous 1 0 0 0 1 0 0 0 0 Continuous 10 11 0 1 0 0 0 0 1 0 0 Single-shot 0 1 0 0 0 0 0 1 0 Single-shot 3 1 0 0 0 0 1 0 0 0 Continuous 12 0 1 0 0 0 0 0 0 1 Single-shot 4 1 0 0 0 0 0 1 0 0 Continuous 13 0 0 1 1 0 0 0 0 0 Single-shot 5 1 0 0 0 0 0 0 1 0 Continuous 14 0 0 1 0 1 0 0 0 0 Single-shot 6 7 1 0 0 0 0 0 0 0 1 0 1 0 1 0 0 0 0 0 Continuous Single-shot 15 16 0 0 1 0 0 1 0 0 0 Single-shot 0 0 1 0 0 0 1 0 0 Single-shot 8 0 1 0 0 1 0 0 0 0 Single-shot 17 0 0 1 0 0 0 0 1 0 Single-shot 9 0 1 0 0 0 1 0 0 0 Single-shot 18 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 C2 C1,C2 IS FOR SC9150A C3 C2 C2,C3 IS FOR SC9149A 1 0 CODE BIT “0”,”0”CAN NOT 0 1 BE USED 1 1 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) 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 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