Ordering number: EN2119D CMOS LSI LC7461M Infrared Remote Control Transmitter IC Functions Package Dimensions . 32%3 function keys . 13-bit custom codes . Operating supply voltage range V = 1.8 to 3.6 V . Supply current at the standby mode I = 1 µA or less . Double-press operation keys (no priority given) . On-chip oscillator (ceramic resonator : connected externally) unit : mm 3045B-MFP24 DD [LC7461M] DD Features . The custom code consists of 7 bits to be fixed by the . on-chip ROM and 6 bits being pin-settable. Sixty-four custom codes may be selected externally (no diode required). Minimum number of external parts required SANYO : MFP24 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Maximum supply voltage VDD max Input voltage VIN Conditions V Each input pin VSS–0.3 to VDD+0.3 V VSS–0.3 to VDD+0.3 VOUT Each output pin Output current IOUT OUT Pd max Unit VSS–0.3 to +5.5 Output voltage Allowable power dissipation Ratings VDD Ta % 85°C V –35 mA 150 mW Operating temperature Topr –40 to +85 °C Storage temperature Tstg –50 to +125 °C Allowable Operating Conditions at Ta = 25°C Parameter Supply voltage Symbol VDD Input high-level voltage VIH Input low-level voltage VIL Oscillation frequency fOSC Pin Name VDD KI0 to KI3, C0 to C5 KI0 to KI3, C0 to C5 Conditions fOSC = 455 kHz min 1.8 typ 3.0 max 3.6 Unit V 0.7 VDD VDD V VSS 0.3VDD V 400 455 500 kHz SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN O3096HA(II)/7058YT/6036KI,TS(KOTO) No.2119-1/7 LC7461M Electrical Characteristics at Ta = 25°C, VDD = 3.0 V Parameter Operating supply current Quiescent supply current Output high-level current Output high-level voltage Output low-level voltage Output OFF-state leakage current Input high-level current Input low-level current Input floating voltage Input pull down resistance Symbol Pin Name Conditions min IDD VDD Key ON, output: no load 1 mA IDS VDD All keys OFF, OSC stop 1 µA IOH1 IOH2 OUT OUT VDD = 1.8 V, VDD = 3.0 V, VOH KO0 to KO7 VOL OUT IOFF KO0 to KO7 IIH IIL VIF C0 to C5 C0 to C5 KI0 to KI3 RIN KI0 to KI3 VOH = 1.0 V VOH = 1.0 V typ max Unit –8 –25 mA mA IOH = –0.1 mA 0.3 V IOL = 0.1 mA 0.3 V VIN = VDD VIN = VSS 1 µA 1 0.1 VDD µA µA V 125 kΩ –1 75 100 Internal Block Diagram Key output timing signal generator Oscillator Key entry circuit Output circuit Divider Key data register Decoder Custom code register No.2119-2/7 LC7461M Pin Assignment Top view Pin Description Pin Name Pin No. Input/Output VDD, VSS 8, 12 KO0 to KO7 13 to 20 Output KI0 to KI3 1 to 4 Input Internal Equivalent Circuit Pin Function Power supply pins VSS = GND Key scan timing signal output pins Keys return signal entry pins Input/output pins for ceramic resonator-used oscillation OSC1 OSC2 10 11 Input/output Oscillator configuration C0 to C5 21 to 24, 5, 6 Input OUT 7 Output TEST 9 Input Input pins for custom code setting Capable of externally setting 6 bits of 13 bits in all that provide a custom code Output pin for transmit LED drive LSI test pin Normally set to high-level or brought to open state No.2119-3/7 LC7461M General Description of Function 1. Oscillator Since a self-bias type amplifier of CMOS inverter is contained, an oscillator can be formed by connecting a ceramic resonator. To minimize power dissipation, the oscillator stops oscillating except when key operation is performed. 2. Key entry Key entry pins KI0 to KI3 and timing signal output pins KO0 to KO7 provide a key matrix of 4 × 8 = 32. Multi-press of key No. 20 and one of key No. 21, 22, 23 may be done, with no priority given in key entry. When the two keys are kept pressed, a series of pulses will be output according to each key entry. If multi-press of keys which are not allowed multi-press is done, no output will be delivered. 3. Data organization Data consists of 42 bits in all: 13 bits of custom code, 8 bits of key data, and their inverted codes. Custom code 13 bits Custom code 13 bits Key data 8 bits Key data 8 bits No.2119-4/7 LC7461M (a) Custom code The custom code, which consists of 13 bits (C0 to C12) in all, is used to distinguish between receiving sets. Pin-selectable Mask ROM 6 bits 7 bits C6 to C12 are fixed by the mask ROM and C0 to C5 are pin-settable. In this example C0 to C5 are set as follows: C0 C1 C2 C3 C4 C5 0 1 1 0 0 1 The custom codes are controlled by Sanyo to avoid duplication. (b) Key data Multi-press KEY No. D0 D1 D2 D3 D4 D5 D6 D7 0 0 0 0 0 0 0 0 0 KEY No. D0 D1 D2 D3 D4 D5 D6 D7 1 1 0 0 0 0 0 0 0 20, 21 1 0 1 0 1 1 0 0 2 0 1 0 0 0 0 0 0 20, 22 0 1 1 0 1 1 0 0 3 1 1 0 0 0 0 0 0 20, 23 1 1 1 0 1 1 0 0 4 0 0 1 0 0 0 0 0 5. .. 28 1. .. 0 0. .. 0 1. .. 1 0. .. 1 0. .. 1 0. .. 0 0. .. 0 0. .. 0 .D,D 29 1 0 1 1 1 0 0 0 30 0 1 1 1 1 0 0 0 31 1 1 1 1 1 0 0 0 6 7 may be preset to ‘‘0’’,‘‘1’’ beforehand (mask option). When multi-press of key No.20 and one of key No.21, 22, 23 is done, multi-bit D5 will be set to ‘‘1’’, with no priority given in key entry. (H: Key-ON state) Key 20 data transmit Keys 20, 21 Key 21 multi-press data data transmit transmit Transmit stop Key 22 data transmit Keys 20, 22 multi-press data transmit No.2119-5/7 LC7461M 4. Transmit waveforms The period of time shown below is for fOSC = 455 kHz. Custom code 13 bits Custom code 13 bits Key data 8 bits Key data 8 bits Leader code . First time . Second time onward (Transmission is available only when key entry continues.) . Carrier waveform Carrier frequency = 1/12 fOSC 7 38 kHz No.2119-6/7 LC7461M Sample Application Circuit Transmit LED In this example custom code C0 to C5 is C0 z z z z z C5. 010101 No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of October, 1996. Specifications and information herein are subject to change without notice. No.2119-7/7