Order this document by MC44107/D SEMICONDUCTOR TECHNICAL DATA 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, hi–fi, etc. The transmitter is an LSI circuit realized in complementary MOS technology. • • • • • • Binary Coded, 9–Bit PCM Data Word Simple Modulator Requirements One–Pin Reference Oscillator for External Ceramic Resonator Very Low (Maximum 1 µA) Standby Current Consumption Wide Operating Voltage Range: 4 to 10 V Operating Temperature Range: – 40 to 85° C P SUFFIX PLASTIC DIP CASE 738 20 1 ORDERING INFORMATION MC44107P Plastic DIP PIN ASSIGNMENT BLOCK DIAGRAM R5 1 20 MUX R2 2 19 CD R7 3 18 CF Dout 4 17 OSC R1 5 16 CG R6 6 15 CC R8 7 14 CB R4 8 13 CE R3 9 12 CH 10 11 PAGE VSS VDD OSC 20 17 ÷ 24 OSC MODULATOR ÷ 25 9–BIT SHIFT REG. 11 ÷ 22 R2 R3 R4 R5 R6 R7 R8 5 2 SUPERVISE AND CONTROL 14 15 9 8 1 DATA ÷ 25 MUX PAGE R1 4 SCANNER ROW ENCODER COLUMN DECODER 6 3 7 19 13 18 16 12 TEST 10 CB CC CD CE CF CG CH VSS This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. REV 2 8/95 Motorola, Inc. 1995 MOTOROLA MC44107 1 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ MAXIMUM RATINGS* (Voltages referenced to VSS) Parameter DC Supply Voltage Input Voltage, All Inputs DC Current Drain per Pin (Except Signal Out and VDD) DC Current Drain (Signal Out and VDD) Storage Temperature Range Symbol Value Unit VDD – 0.5 to + 12 V Vin – 0.5 to VDD + 0.5 V I 2 mA I 10 mA Tstg – 65 to + 150 °C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the limits in the Electrical Characteristics tables or Pin Descriptions section. This device contains protection circuitry to guard against damage due to high static voltages or electric fields; however, it is advised that precautions be taken to avoid application of voltage higher than maximum rated voltages to this high–impedance circuit. For proper operation it is recommended that Vin and Vout be constrained to the range VSS ≤ (Vin or Vout) ≤VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). ELECTRICAL CHARACTERISTICS Characteristic Symbol Inputs R1…R8 and PAGE (with Pull–Up) Iin at Vin = 1.2 V Iin at Vin = 3 V Iin at Vin = 2.8 V Iin at Vin = 7 V Iin – 40°C 25°C 85°C VDD Vdc Min Max Min Typ Max Min Max 4 10 4 10 — — 5 25 70 350 — — — — 4 20 — — — — 50 250 — — — — 3 15 40 200 — — Unit µA VIH VIH VIH 4 10 2.8 7 — — 2.8 7 — — — — 2.8 7 — — V VIL VIL VIL 4 10 — — 1.2 3 — — — — 1.2 3 — — 1.2 3 V Outputs CB…CH (Open Drain) Ion at Von = 1.2 V Ion at Von = 3 V Ion 4 10 270 1350 — — 200 1000 — — — — 160 800 — — Ioff Ioff Ioff 4 10 — — 1 1 — — 1 1 — — — — 1 1 µA VOH at Isource = 1.0 mA VOH 4 10 3.2 9.6 — — 3.0 9.5 — — 1 0.5 2.8 9.4 — — V VOL at Isink = 1.0 mA VOL 4 10 — — 0.8 0.4 — — — — 1 0.5 — — 1.2 0.6 V VDD — 4 10 4 — 10 4 10 V Standby Current IDDSTB 4 10 — — — — — — 0.02 0.02 1 1 — — — — µA Active Mode Current IDDACT 4 10 — — — — — — 0.07 0.45 1 2 — — — — mA Oscillator Frequency fosc — — — 430 — 530 — — kHz Output DATA Supply Voltage MC44107 2 µA MOTOROLA CIRCUIT OPERATION The transmitter emits a 9–bit, labelled A (LSB) to I (MSB), binary code able to encode 512 commands organized as 8 pages of 64 commands. All of these commands are user selectable except the last command (511) 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. BIT–n ‘0’ f1* AM ‘1’ f1* * f1 is a train of pulses at the carrier frequency ÷ 16. Figure 1. Signal Coding 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). VSS acts as the eight column line to give the full complement of 64 commands per page. The maximum “ON” resistance of the keyboard must be limited to 500 Ω . 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 current consumption — typically less than 1 µA. For this reason the battery may be left continuously in circuit. As soon as a key is selected, the circuit switches to its active mode and enables the oscillator. To allow for accidental activation and/or key bounce, the circuit requires that the key is held for a minimum delay of tkey, 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 MOTOROLA 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 sequence is not followed, the circuit will default to the appropriate command between 0 and 63. If two or more page keys are accidentally held down, only the first one pressed will be detected. A command consists of several messages. Each command starts with the message 511 (SST) followed by the 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 pre–bit, a pre–bit pause, a start–bit, and nine data bits, where the pre–bit and the start– bit are always logical “1”. The pre–bit allows for the set up of the AGC loop in the receiving preamplifier. The truth tables for data bits are given in Tables 1 and 2, while Figure 2 shows the timing relationships between the commands, messages, and modulation. In the event of accidental multi–key 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 input and any column output except A, the command appropriate to the first key selected will be transmitted until that key is released. After the SST code has been transmitted, assuming another key is still selected, the command appropriate to that key will be transmitted. If the other key has been released 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 code is transmitted and the circuit will revert to the standby mode. Only when the multi–key condition is released and a single key is selected will the circuit resume operation, as previously described. MC44107 3 SST COM COM COM COM SST g h i COMMAND TIMING S=1 d d f a A(0) b e B(1) C(1) D(1) E(0) F(0) G(1) H(1) I(1) d MESSAGE TIMING e c d ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ MODULATION OF BURST CIRCUIT TIMING* a = 4/fosc b = 16/fosc c = 4/fosc d = 256/fosc 8 µs 32 µs 8 µs 512 µs Half–Bit Time Message Timing d = 256/fosc e = 512/fosc f = 1536/fosc 512 µs 1.02 ms 3.072 ms Half–Bit Time Bit Time Pre–Pulse Time Command Timing g = 32 x Bit Time h = 128 x Bit Time i = 128 x Bit Time tkey = 64 x Bit Time 32.8 ms 131 ms 131 ms 65.6 ms Modulation 1/f Carrier * Times indicated are typical and refer to an oscillator frequency of 500 kHz. Figure 2. MC44107 Remote Control Transmitter Timing Diagram MC44107 4 MOTOROLA PAGE 1000 µF VDD IR DIODES PAGE KEYS CB DATA DRIVER IC COLUMN OUTPUTS CH MATRIX KEYS MC44107 R1 ROW INPUTS R8 OSC CERAMIC RESONATOR VSS Figure 3. Transmitter Circuit MOTOROLA MC44107 5 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 pull–up resistors. As soon as a key is pressed, a logical “0” is presented by the column output on that particular line. This switches the circuit to the active 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 “0”. When a key is selected and the oscillator starts, the outputs are released and the scanning routine starts. (see Table 1). If connected to one of the column outputs, the remaining pages become available (see Table 2). The specified standby current consumption is maintained regardless of the load applied to the input: 0 V < V page < VDD. OSCILLATOR (Pin 17) A one–pin oscillator is incorporated into the circuit, which has been specifically designed for use with an inexpensive 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 subsequent external amplification. PAGE INPUT (Pin 11) 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 MC44107 6 SPECIAL NOTE: KEYBOARD It is important, when considering a keyboard, that the maximum “ON” resistance, even after aging, of 500 Ω is strictly observed. MOTOROLA Table 1. Transmitted Codes Message Number Matrix Connect Row/Col I Message Number Matrix Connect Row/Col A B C D E F G H A B C D E F G H I 0 1A 0 0 0 0 0 0 0 1 1B 1 0 0 0 0 0 0 0 0 32 5A 0 0 0 0 0 1 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 8 2A 0 1 1 0 0 0 0 0 0 39 5H 1 1 1 0 0 1 0 0 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 MOTOROLA Binary Code Binary Code MC44107 7 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 738–03 -A20 11 1 10 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. B C -T- L K SEATING PLANE M E G N F J 20 PL 0.25 (0.010) D 20 PL 0.25 (0.010) M T A M M T B M DIM A B C D E F G J K L M N INCHES MIN MAX 1.010 1.070 0.240 0.260 0.150 0.180 0.015 0.022 0.050 BSC 0.050 0.070 0.100 BSC 0.008 0.015 0.110 0.140 0.300 BSC 15° 0° 0.020 0.040 MILLIMETERS MIN MAX 25.66 27.17 6.10 6.60 3.81 4.57 0.39 0.55 1.27 BSC 1.27 1.77 2.54 BSC 0.21 0.38 2.80 3.55 7.62 BSC 0° 15° 1.01 0.51 Motorola reserves the right to make changes without further notice to any products herein. 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Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, Toshikatsu Otsuki, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–3521–8315 MFAX: [email protected] – TOUCHTONE (602) 244–6609 INTERNET: http://Design–NET.com HONG KONG: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 MC44107 8 ◊ *MC44107/D* MC44107/D MOTOROLA