MITSUBISHI LSis MS8487P 22-FUNCTION REMOTE CONTROL RECEIVER DESCRIPTION The M58487P is a 22-function remote-control receiver circuit manufactured by aluminum-gate CMOS technology for use in television receivers, audio equipment, and the like, using infrared for transmission. It enables direct control of 8 functions at the receiver. The M58487P is intended for use with an M58480P or M58484P transmitter. FEATURES @ Single power supply Wide supply voltage range: 8V~14V Low power dissipation On-chip oscillator Low-cost LC or ceramic oscillator used in determining the reference frequency (480kHz or 455kHz) @ Information is transmitted by means of pulse code modulation , Good noise immunityinstructions are not executed unless same code is received three or more times in succession. @ Single transmission frequency (40kHz or 38kHz) for carrier wave @ 16 TV channels selected directly Three analog functionsvolume, brightness, and color saturationare independently controlied to 64 stages by three 6-bit D/A converters @ 8 commands are controlled at the M58487P receiver @ Has large tolerance in operating frequency between the transmitter and the receiver @ Can be connected with an M51231P or equivalent touch control channel selector IC PIN CONFIGURATION (TOP VIEW) (ov) Vss [22] < Power on fOWER-ON RECEPTION TRANSMISSION SIGNAL INPUT si [2] zy IR OrBOTNS POWER. _ neSevingey = AC 13 20> capeseT , oo Boer [apes KEY INPUT l2 [5 | = 118]> CH OOWN ao zg POWER POWER ON, ml} & ON/OFF QPF CONTROL TR SCANNER a bao] 116}> CALL CONTRO OL bei c [8] 5] MUTE INDICATION. E OUTPUT o (9] 114] vo D/A OUTPUT osc IN +H10] NC SSERLARCH| iN ose out {i7} Vop (8~ 14V) Outline 22P1 NC : NO CONNECTION APPLICATIONS @ Remote-control receiver for TV or other applications FUNCTIONS The M58487P is designed to decode and execute instruc- tions after three successive receptions of the identical instruction code, providing a good noise immunity. Instructions comprise direct selection of 16 channels, channel position up and down, volume up and down, brightness up and down, color saturation up and down, normalization of volume, brightness and color saturation, sound mute on and off, TV main power on and off, and output CALL on and off. In addition, 8 functional instructions can be entered from the receiver side. BLOCK DIAGRAM POWER-ON RESET INPUT AC I KEY INPUTS, { l2 Voo(8~14V) Vss (OV) UP/DOWN COUNTER vo D/A OUTPUT POWER CONT fot OUtbut Ga ON/OFF CONT POWER out SCANNER OUTPUTS POWER POWER ON/OFF INPU $c o CHANNEL CONTROL OUTPUTS TRANSMISSION | SIGNAL INPUT 1 - IR OSCIN OSCOUT CALL INQIEATION OSCILLATOR. CONTROL CUTEUT INtOOTPUT GOYA ELECTRIC 1035WeEloOvVeIiont Lois MS8487P 22-FUNCTION REMOTE CONTROL RECEIVER FUNCTION DESCRIPTION Oscillator As the oscillator is on-chip, oscillation frequency is easily obtained by connecting an external LC network or ceramic resonator between the OSC IN and OSC OUT terminals. Figs. 1 and 2 show typical oscillators. Fig. 1 An example of an oscillator (when a ceramic resonator is used) CERAMIC RESONATOR : SFB455A OR M58487P CSB455A (MADE BY MURATA SEISAKUSHO} OSC IN ose OUT | oi, Cro > S0~ 150pF ~ Re Fig. 2 An example of an oscillator (when a LC network is used) L > 2.5mH Cu. Clo: 90pF M58487P te wrasse Cc 20.1 uF OSC _IN OSC OUT Brey oul qe Reception Signal Input Circuit and Demodulation Circuit The reception signal caught by the photo detector is amplified in the amplifier and added to the SI, where it is converted into a pulse signal in the input circuit to be sent to the demodulation circuit. In the demodulation circuit, the pulse interval of the pulse signal is judged and then converted into the digital code to be sent to the instruction decoder. S! is applied as amplified, either through a capacitor coupling (Fig. 3) or directly as a pulse signal (Figs. 4 and 5). A Schmitt trigger circuit is provided in the SI input circuit for preventing spurious operation due to noise. Fig. 3 SI input waveform (when applied through a capaci- tor coupling) Above 2.5V Above 2.5V Fig. 4 SI input waveform (when applied directly) Instruction Decoder The instruction decoder starts to function after receiving the same instruction code three or more times in succession from the demodulation circuit. Table 1 shows the relations between the reception code and instruction function. To prevent spurious operation, there is no code 000000. Table 1 Relations between reception codes and instructions Reception code D2 Os Function Remarks Oo oO os Oo = 9 oa VO UP VO DOWN MUTE VOC 3) Normalization of votume CALL Output CALL on/off POWER ON/OFF | Power on/off CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 7 8 Volume up Volume down Sound mute on/off CH CH Direct channel CH $9 selection (Direct access) CH 10 CH 11 CH 12 CH 13 CH 14 CH 15 CH 16 - O-r- OF GH OC - C7002 002 0-6 0 = ~~ er oop se OO se me OC Ose Be BD OH OH OO a ot ew ew OO CO He ewe ew BP OO UUOlUlUCOOOUlUlUrhlUlc Or CUCOUCUCOUcUCUCO freee apse 4-7-2000 RO ceo coo el eh he hUlc oH UCC 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ooococ coco coc cmUcUOCcUOCUNDCcCOCCOC CoO eo aa eo eB Key Inputs 8 different instructions are input by a 2X4 keyboard matrix consisting of inputs I,;~l. and scanner outputs A~@D. Protection is also available against chattering within 10ms. As entry priority is given to each key, depression of more than two keys at the same time makes the key with higher priority effective. For the scanner output, priority is given in the order of A, $B, C, and @D, and I, takes precedence over |, if the scan output is the same. When two or more keys are depressed at the same time, scanner outputs may short-circuit, disabling all functions. While one of the keys is depressed, instructions from the transmitter are ignored. Table 2 shows the relations between the keyboard matrix and the instructions. Voo ep Table 2 Relations between keyboard matrix and ll (| ll instructions VsslUul... JU Scanner 2 . output Fig. 5 SI input waveform (when applied directly) Key input ~ *e ea Voo a sone ty Ouvore: | VO UP MUTE CH UP il ll | | | lz CALL | VO DOWN] VO(14) | CH DOWN Vss MULL... sored MITSUBISHI 1036 ELECTRICIndication of Reception As soon as an identical code is received three times, output !R turns from low-level to high-level. Thus reception of an instruction from the transmitter can be indicated by an LED connected to the output IR. Output VO As the 6-bit D/A converter is contained internally, analog value can be controlled to 64 stages independently. The D/A converter is pulse-width modulator, the reception frequency is 1.25kHz (when fogc = 480kHz) and minimum pulse width is 12.5ys. Analog value can be incremented/decremented at a rate of about 1 step/0.1 second through the remote control or the key input. The time required for increasing the analog value from the minimum to the maximum is about 6.6 seconds (when fogc = 480kHz). It is also possible to set the analog value to 1/3 of its maximum value by means of the remote control or the key input (normalization). Sound Mute Sound mute on/off is controlled through the remote control or the key input. When sound mute is on, output VO goes low, and output MUTE goes high. Sound mute is automatically released from ON when the MITSUBISHI LSIs MS8487P 22-FUNCTION REMOTE CONTROL RECEIVER Power On/Off The remote control! or the key input makes it possible to turn the POWER ON/OFF output from low to high or vice versa. While the POWER ON/OFF output is low, all channel and analog controls through the remote control are dis- abled, as are all through the keyboard. Output CALL The output CALL is turned high or low by remote contro! or the key input. This output effects on/off control of channel number indication or change of receiving modes of multi-channel broadcasting. Power-on Reset Attaching a capacitor to terminal AC activates the power- on reset when power is on to the M58487P. Activation of the power-on reset function sets output VO to 1/3 of its maximum value and turns the POWER ON/OFF and CALL outputs to low-level. An Example of an Application Circuit (+) POWER SOURCE eo ELECTRIC . . NUMBER| output VO is either incremented or decremented by remote ann ons ICALION. ABRAMS control or the key input. Bau Pr Tt ANALOS Channel Control i Ot a Channel control is attained through outputs CH UP, id 15] 14 12 CH DOWN and CH RESET. With respect to direct channel west Go sO wore veo selection by the remote-control operation, a single pulse M58487P i osc osc appears on output CH RESET first, and then the pulses AC hk $a de de do OR Be whose number is deducted by one from the selected il 1 al CS 4g 7 3 J 9 1 channel appear on the output CH UP, Up and down L O channel switching is controlled by presenting a single pulse I Z| Al A ll Cut Too on the output CH UP or CH DOWN. Thus it can be con- ageBAMSa nected with an M51231P or equivalent touch-control Cy POWER OU channel selector IC. [pvruren w Fig. 6 Timing chart of channel control (when fose = 480kHz) CH RESET cH UP Lft_y i. Lt 25.6ms 0.8ms 08ms 0.8ms During direct channel selection, up or down, output VO goes low for 50~100ms. Outputs, CH UP, CH DOWN, and CH RESET are the open-drain type of N-channel transistor. MITSUBISHI 1037MITSUBISHI LSIs MS8487P 22-FUNCTION REMOTE CONTROL RECEIVER ABSOLUTE MAXIMUM RATINGS Symbol Parameter Conditions Limits Unit Voo Supply voltage With respect to Vss 0.3~15 Vv Vi Input voltage Vss=ViSVoo Vv Vo Output voltage Vss=VoSVop Vv Pg Maximum power dissipation Ta=25 300 mw Topr Operating free-air temperature range 30~70 c Tstg Storage temperature range 40~125 c RECOMMENDED OPERATING CONDITIONS Symboi Parameter Limits Unit Min Nom Max Vop Supply voltage 8 12 14 Vv fose Oscillation frequency ass kHz 480 kHz My Input voltage, Si 5 Vp-p ELECTRICAL CHARACTERISTICS (Ta=25CT, Vpo=12V. unless otherwise noted.) Symbol Parameter Tast conditions Limits Unit Min Typ Max Voo Operating supply voltage Ta=30~70. fosc=455kHz 8 12 14 Vv lop Supply current fosc= 455kHz 2 5 mA RA; Puil-up resistances. 14, l2 20 kQ lot Low-level output currents, 64 ~ $D Vo=12V 5 mA lot Low-level output currents, CH RESET, CH UP. CH DOWN Vo=12V 20 mA lozH Off-state output currents. CH RESET. CH UP. CH DOWN Vo=1ev 1 uA lou High-level output current. VO Vo=O0V -7 mA lot Low-level output current, VO Vo=12V 7 mA 1oH High-level output currents. POWER ON/OFF. CALL, MUTE Vo=O0V 20 mA fou Low-level output currents, POWER ON/OFF. CALL, MUTE Vo=12V 5 mA Jou High-tevel output current, 1R Vo=0V 15 mA for Low-level output current. IR Vo=12V 5 mA MITSUBISHI 1038 ELECTRIC