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| Ordering number: EN2119D CMOS LSI LC7461M Infrared Remote Control Transmitter IC Functions Package Dimensions unit : mm . 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 A or less . Double-press operation keys (no priority given) . On-chip oscillator (ceramic resonator : connected externally) DD DD 3045B-MFP24 [LC7461M] 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 = 25C Parameter Maximum supply voltage Input voltage Output voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol VDD max VIN VOUT IOUT Pd max Topr Tstg VDD Each input pin Each output pin OUT Ta % 85C Conditions Ratings VSS-0.3 to +5.5 VSS-0.3 to VDD+0.3 VSS-0.3 to VDD+0.3 -35 150 -40 to +85 -50 to +125 Unit V V V mA mW C C Allowable Operating Conditions at Ta = 25C Parameter Supply voltage Input high-level voltage Input low-level voltage Oscillation frequency Symbol VDD VIH VIL fOSC Pin Name VDD KI0 to KI3, C0 to C5 KI0 to KI3, C0 to C5 Conditions fOSC = 455 kHz min 1.8 0.7 VDD VSS 400 455 typ 3.0 max 3.6 VDD 0.3VDD 500 Unit V V V 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 = 25C, 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 IDD IDS IOH1 IOH2 VOH VOL IOFF IIH IIL VIF RIN Pin Name VDD VDD OUT OUT KO0 to KO7 OUT KO0 to KO7 C0 to C5 C0 to C5 KI0 to KI3 KI0 to KI3 VIN = VDD VIN = VSS -1 0.1 VDD 75 100 125 Conditions Key ON, output: no load All keys OFF, OSC stop VDD = 1.8 V, VDD = 3.0 V, VOH = 1.0 V VOH = 1.0 V -8 -25 0.3 0.3 1 1 min typ max 1 1 Unit mA A mA mA V V A A A V k IOH = -0.1 mA IOL = 0.1 mA Internal Block Diagram Key output timing signal generator Output circuit Oscillator Divider Decoder Key entry circuit Key data register Custom code register No.2119-2/7 LC7461M Pin Assignment Top view Pin Description Pin Name VDD, VSS KO0 to KO7 Pin No. 8, 12 13 to 20 Output Input/Output Internal Equivalent Circuit Pin Function Power supply pins VSS = GND Key scan timing signal output pins KI0 to KI3 1 to 4 Input 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 Input pins for custom code setting Capable of externally setting 6 bits of 13 bits in all that provide a custom code OUT 7 Output Output pin for transmit LED drive TEST 9 Input 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 x 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 6 bits Mask ROM 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 0 C1 1 C2 1 C3 0 C4 0 C5 1 The custom codes are controlled by Sanyo to avoid duplication. (b) Key data KEY No. 0 1 2 3 4 5 . . . 28 29 30 31 D0 0 1 0 1 0 1 . . . 0 1 0 1 D1 0 0 1 1 0 0 . . . 0 0 1 1 D2 0 0 0 0 1 1 . . . 1 1 1 1 D3 0 0 0 0 0 0 . . . 1 1 1 1 D4 0 0 0 0 0 0 . . . 1 1 1 1 D5 0 0 0 0 0 0 . . . 0 0 0 0 D6 0 0 0 0 0 0 . . . 0 0 0 0 D7 0 0 0 0 0 0 . . . 0 0 0 0 Multi-press KEY No. 20, 21 20, 22 20, 23 D0 1 0 1 D1 0 1 1 D2 1 1 1 D3 0 0 0 D4 1 1 1 D5 1 1 1 D6 0 0 0 D7 0 0 0 .D,D 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 Leader code Custom code 13 bits Key data 8 bits Key data 8 bits . 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 |
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