MC44107 motorola 1 product preview
cmos the MC44107 remote control transmitter converts a keyboard input into a pulse code modulated signal suitable for infrared transmission to an appropriate receiver. its large command capacity , 512 commands, makes it highly suited to remote control applications in tv , video, hifi, etc. the transmitter is an lsi circuit realized in complementary mos technology. ? binary coded, 9bit pcm data word ? simple modulator requirements ? onepin reference oscillator for external ceramic resonator ? very low (maximum 1 m a) standby current consumption ? wide operating voltage range: 4 to 10 v ? operating temperature range: 40 to 85 c cb cc cd ce cf cg ch 14 15 19 13 18 16 12 modulator 9bit shift reg. column decoder scanner 4 data mux 2 4 2 5 supervise and control 2 2 row encoder test 2 5 r1 r2 r3 r4 r5 r6 r7 r8 5 2 9 8 1 6 3 7 osc osc page 11 v dd 20 v ss block diagram 17 10 this document contains information on a product under development. motorola reserves the right to change or discontinue this product without notice. order this document by MC44107/d
semiconductor technical data
p suffix plastic dip case 738 ordering information MC44107p plastic dip pin assignment r6 d out r7 r2 r5 v ss r3 r4 r8 r1 5 4 3 2 1 10 9 8 7 6 14 15 16 17 18 19 20 11 12 13 cg osc cf cd mux page ch ce cc cb 20 1 ? motorola, inc. 1995 rev 2 8/95
MC44107 motorola 2 maximum ratings* (voltages referenced to v ss ) parameter symbol value unit dc supply voltage v dd 0.5 to + 12 v input voltage, all inputs v in 0.5 to v dd + 0.5 v dc current drain per pin (except signal out and v dd ) i 2 ma dc current drain (signal out and v dd ) i 10 ma storage temperature range t stg 65 to + 150 c * maximum ratings are those values beyond which damage to the device may occur . func - tional operation should be restricted to the limits in the electrical characteristics tables or pin descriptions section. electrical characteristics characteristic symbol v dd v dc 40 c 25 c 85 c unit characteristic symbol v dd v dc min max min typ max min max unit inputs r1 r8 and page (with pullup) i in at v in = 1.2 v i in at v in = 3 v i in at v in = 2.8 v i in at v in = 7 v i in 4 10 4 10 e e 5 25 70 350 e e e e 4 20 e e e e 50 250 e e e e 3 15 40 200 e e m a v ih v ih v ih 4 10 2.8 7 e e 2.8 7 e e e e 2.8 7 e e v v il v il v il 4 10 e e 1.2 3 e e e e 1.2 3 e e 1.2 3 v outputs cb ch (open drain) i on at v on = 1.2 v i on at v on = 3 v i on 4 10 270 1350 e e 200 1000 e e e e 160 800 e e m a i off i off i off 4 10 e e 1 1 e e 1 1 e e e e 1 1 m a output data v oh at i source = 1.0 ma v oh 4 10 3.2 9.6 e e 3.0 9.5 e e 1 0.5 2.8 9.4 e e v v ol at i sink = 1.0 ma v ol 4 10 e e 0.8 0.4 e e e e 1 0.5 e e 1.2 0.6 v supply voltage v dd e 4 10 4 e 10 4 10 v standby current i ddstb 4 10 e e e e e e 0.02 0.02 1 1 e e e e m a active mode current i ddact 4 10 e e e e e e 0.07 0.45 1 2 e e e e ma oscillator frequency f osc e e e 430 e 530 e e khz this device contains protection circuitry to guard against damage due to high static voltages or electric fields; however , it is ad - vised that precautions be taken to avoid application of voltage higher than maximum rated voltages to this highimpedance circuit. for proper operation it is recommended that v in and v out be constrained to the range v ss (v in or v out ) v dd . unused inputs must always be tied to an appropriate logic voltage level (e.g., either v ss or v dd ).
MC44107 motorola 3 circuit operation the transmitter emits a 9bit, labelled a (lsb) to i (msb), binary c od e a bl e t o e ncod e 5 1 2 c ommand s o rganize d a s 8 pages of 64 commands. all of these commands are user selectable except the last command (51 1) which is used as an sst, start/stop transmission code. each bit of the transmitted signal is in the form of a biphase pulse code modulated (pcm) signal, whose coding is shown in figure 1. figure 1. signal coding bitn `0' am `1' f 1 * f 1 * * f 1 is a train of pulses at the carrier frequency 16. the keyboard can be a simple switch matrix, connected between the eight row inputs (1 to 8) and the seven column outputs (b to h). v ss acts as the eight column line to give the full complement of 64 commands per page. the maximum aono resistance of the keyboard must be limited to 500 w . page access is accomplished by connecting, by means of a key , the page input to one of the seven column outputs or by leaving the input circuit open. one of the circuit' s major features is its low standby cur - rent consumption e typically less than 1 m a. for this reason the battery may be left continuously in circuit. as soon as a key is selected, the circuit switches to its ac- tive mode and enables the oscillator . t o allow for accidental activation and/or key bounce, the circuit requires that the key is held for a minimum delay of t key , which in the case of a 500 khz oscillator is 65.6 ms. after this delay the column/ row/page command, consisting of a string of messages (see figure 2), appropriate to the key selected will be transmitted and repeated until the key is released. any page key required must be selected before, and held during, the selection of the column/row matrix key . if this se- quence is not followed, the circuit will default to the appropri - ate command between 0 and 63. if two or more page keys are accidentally held down, only the first one pressed will be detected. a c omman d c onsist s o f s evera l m essages . e ac h c om- mand s tart s w it h t h e m essage 5 1 1 ( sst ) f ollowe d b y t he message appropriate to the key selected. these messages are repeated until the key is released. the final message is always followed by the sst message, 511. every message consists of a prebit, a prebit pause, a startbit, and nine data bits, where the prebit and the start bit are always logical a1o. the prebit allows for the set up of the agc loop in the receiving preamplifier . the truth tables for d at a b it s a r e g ive n i n t able s 1 a n d 2 , w hil e f igur e 2 shows t h e t imin g r elationships b etwee n t h e c ommands, messages, and modulation. in the event of accidental multikey operation, the circuit will react in one of three ways, depending on the combination of the keys selected. when two or more keys are connected to the same row in - put and any column output except a, the command appropri- ate to the first key selected will be transmitted until that key is released. after the sst code has been transmitted, assum - ing another key is still selected, the command appropriate to that key will be transmitted. if the other key has been re - leased in the meantime, the circuit will revert to standby. if two keys are selected in the same row with one being connected to column a, any transmission will terminate with the sst code and then the circuit will transmit the command appropriate to the key connected to column a. in the case where two or more keys connected to the same column are selected, the circuit reacts in a normal manner to the first key activated. upon selection of the second key, the sst c od e i s t ransmitte d a n d t h e c ircui t w il l r ever t t o t he standby m ode . o nl y w he n t h e m ultike y c onditio n i s r e- leased and a single key is selected will the circuit resume op - eration, as previously described.
MC44107 motorola 4 message timing modulation of burst d(1) e(0) f(0) g(1) h(1) i(1) s = 1 a(0) b(1) c(1) g h i f e d a b c e d d d sst com com com sst com command timing circuit timing* modulation a = 4/f osc b = 16/f osc c = 4/f osc d = 256/f osc 8 m s 32 m s 8 m s 512 m s 1/f carrier halfbit time message timing d = 256/f osc e = 512/f osc f = 1536/f osc 512 m s 1.02 ms 3.072 ms halfbit time bit time prepulse time command timing g = 32 x bit time h = 128 x bit time i = 128 x bit time t key = 64 x bit time 32.8 ms 131 ms 131 ms 65.6 ms * t imes indicated are typical and refer to an oscillator frequency of 500 khz. figure 2. MC44107 remote control transmitter timing diagram
MC44107 motorola 5 page cb column outputs ch r1 row inputs r8 data v dd osc v ss driver ic ir diodes 1000 m f ceramic resonator page keys matrix keys figure 3. transmitter circuit MC44107
MC44107 motorola 6 pin descriptions row inputs 1 to 8 ( pins 1, 2, 3, and 5 9) in the standby mode these inputs are held high by internal pullup resistors. as soon as a key is pressed, a logical a0o is presented by the column out - put on that particular line. this switches the circuit to the ac - tive mode and starts the oscillator. column outputs b to h (pins 12 16, 18, and 19) in the standby mode these pins are held low , logical a0o. when a key is selected and the oscillator starts, the outputs are released and the scanning routine starts. page input (pin 1 1) this input is connected directly to the transmitter 's supervisory and control circuitry and may be connected to one of the column outputs, via a key , or left open. if the pin is left open, the first page of 64 commands will be available (see table 1). if connected to one of the column outputs, the remaining pages become available (see t able 2). the speci- fied standby current consumption is maintained regardless of the load applied to the input: 0 v < v page < v dd. oscillator (pin 17) a onepin oscillator is incorporated into the circuit, which has been specifically designed for use with an inex - pensive ceramic resonator between 430 khz and 530 khz. it is possible to use a tuned lc circuit with a series capacitor , in place of the ceramic resonator. data output (pin 4) this output provides the modulated signal for sub - sequent external amplification. special note: keyboard it is important, when considering a keyboard, that the max - imum aono resistance, even after aging, of 500 w is strictly observed.
MC44107 motorola 7 table 1. transmitted codes message number matrix connect row/col binary code message number matrix connect row/col binary code message number connect row/col a b c d e f g h i message number connect row/col a b c d e f g h i 0 1a 0 0 0 0 0 0 0 0 0 32 5a 0 0 0 0 0 1 0 0 0 1 1b 1 0 0 0 0 0 0 0 0 33 5b 1 0 0 0 0 1 0 0 0 2 1c 0 1 0 0 0 0 0 0 0 34 5c 0 1 0 0 0 1 0 0 0 3 1d 1 1 0 0 0 0 0 0 0 35 5d 1 1 0 0 0 1 0 0 0 4 1e 0 0 1 0 0 0 0 0 0 36 5e 0 0 1 0 0 1 0 0 0 5 1f 1 0 1 0 0 0 0 0 0 37 5f 1 0 1 0 0 1 0 0 0 6 1g 0 1 1 0 0 0 0 0 0 38 5g 0 1 1 0 0 1 0 0 0 7 1h 1 1 1 0 0 0 0 0 0 39 5h 1 1 1 0 0 1 0 0 0 8 2a 0 0 0 1 0 0 0 0 0 40 6a 0 0 0 1 0 1 0 0 0 9 2b 1 0 0 1 0 0 0 0 0 41 6b 1 0 0 1 0 1 0 0 0 10 2c 0 1 0 1 0 0 0 0 0 42 6c 0 1 0 1 0 1 0 0 0 11 2d 1 1 0 1 0 0 0 0 0 43 6d 1 1 0 1 0 1 0 0 0 12 2e 0 0 1 1 0 0 0 0 0 44 6e 0 0 1 1 0 1 0 0 0 13 2f 1 0 1 1 0 0 0 0 0 45 6f 1 0 1 1 0 1 0 0 0 14 2g 0 1 1 1 0 0 0 0 0 46 6g 0 1 1 1 0 1 0 0 0 15 2h 1 1 1 1 0 0 0 0 0 47 6h 1 1 1 1 0 1 0 0 0 16 3a 0 0 0 0 1 0 0 0 0 48 7a 0 0 0 0 1 1 0 0 0 17 3b 1 0 0 0 1 0 0 0 0 49 7b 1 0 0 0 1 1 0 0 0 18 3c 0 1 0 0 1 0 0 0 0 50 7c 0 1 0 0 1 1 0 0 0 19 3d 1 1 0 0 1 0 0 0 0 51 7d 1 1 0 0 1 1 0 0 0 20 3e 0 0 1 0 1 0 0 0 0 52 7e 0 0 1 0 1 1 0 0 0 21 3f 1 0 1 0 1 0 0 0 0 53 7f 1 0 1 0 1 1 0 0 0 22 3g 0 1 1 0 1 0 0 0 0 54 7g 0 1 1 0 1 1 0 0 0 23 3h 1 1 1 0 1 0 0 0 0 55 7h 1 1 1 0 1 1 0 0 0 24 4a 0 0 0 1 1 0 0 0 0 56 8a 0 0 0 1 1 1 0 0 0 25 4b 1 0 0 1 1 0 0 0 0 57 8b 1 0 0 1 1 1 0 0 0 26 4c 0 1 0 1 1 0 0 0 0 58 8c 0 1 0 1 1 1 0 0 0 27 4d 1 1 0 1 1 0 0 0 0 59 8d 1 1 0 1 1 1 0 0 0 28 4e 0 0 1 1 1 0 0 0 0 60 8e 0 0 1 1 1 1 0 0 0 29 4f 1 0 1 1 1 0 0 0 0 61 8f 1 0 1 1 1 1 0 0 0 30 4g 0 1 1 1 1 0 0 0 0 62 8g 0 1 1 1 1 1 0 0 0 31 4h 1 1 1 1 1 0 0 0 0 63 8h 1 1 1 1 1 1 0 0 0
MC44107 motorola 8 table 2. page table message page input connected to g h i 0 to 63 not connected 0 0 0 64 to 127 cb 1 0 0 128 to 191 cc 0 1 0 192 to 255 cd 1 1 0 256 to 319 ce 0 0 1 320 to 383 cf 1 0 1 384 to 447 cg 0 1 1 448 to 511 ch 1 1 1 package dimensions p suffix plastic dip case 73803 1.070 0.260 0.180 0.022 0.070 0.015 0.140 15 0.040 1.010 0.240 0.150 0.015 0.050 0.008 0.110 0 0.020 25.66 6.10 3.81 0.39 1.27 0.21 2.80 0 0.51 27.17 6.60 4.57 0.55 1.77 0.38 3.55 15 1.01 0.050 bsc 0.100 bsc 0.300 bsc 1.27 bsc 2.54 bsc 7.62 bsc min min max max inches millimeters dim a b c d e f g j k l m n notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. dimension l to center of lead when formed parallel. 4. dimension b does not include mold flash. -a- c k n e g f d 20 pl j 20 pl l m -t- seating plane 1 10 11 20 0.25 (0.010) t a m m 0.25 (0.010) t b m m b motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty , representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability , including without limitation consequential or incidental damages. at ypicalo parameters can and do vary in dif ferent applications. all operating parameters, including at ypicalso must be validated for each customer application by customer ' s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur . should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly , any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/af firmative action employer . how to reach us: usa/europe : motorola literature distribution; japan : nippon motorola ltd.; tatsumispdjldc, toshikatsu otsuki, p.o. box 20912; phoenix, arizona 85036. 18004412447 6f seibubutsuryucenter, 3142 tatsumi kotoku, tokyo 135, japan. 0335218315 mfax : rmf ax0@email.sps.mot.com t ouchtone (602) 2446609 hong kong : motorola semiconductors h.k. ltd.; 8b tai ping industrial park, internet : http://designnet.com 51 ting kok road, tai po, n.t., hong kong. 85226629298 MC44107/d ?
|
