Order this document by MC14497/D SEMICONDUCTOR TECHNICAL DATA P SUFFIX PLASTIC DIP CASE 707 The MC14497 is a PCM remote control transmitter realized in CMOS technology. Using a dual–single (FSK/AM) frequency bi–phase modulation, the transmitter is designed to work with the MC3373 receiver. Information on the MC3373 can be found in the Motorola Linear and Interface Integrated Circuits book (DL128/D). There is not a decoder device which is compatible with the MC14497. Typically, the decoding resides in MCU software. 18 1 ORDERING INFORMATION MC14497P • Both FSK/AM Modulation Selectable • 62 Channels (Up to 62 Keys) • Reference Oscillator Controlled by Inexpensive Ceramic Resonator: Maximum Frequency = 500 kHz • Very Low Duty Cycle • Very Low Standby Current: 50 µA Maximum • Infrared Transmission • Selectable Start–Bit Polarity (AM Only) • Shifted Key Mode Available • Wide Operating Voltage Range: 4 to 10 V • See Application Notes AN1016 and AN1203 Plastic DIP PIN ASSIGNMENT E3 1 18 VDD E2 2 17 E1 E9 3 16 E4 A4 4 15 E5 A3 5 14 E6 A2 6 13 OSCout A1 7 12 OSCin SIGNAL OUT 8 11 E8 VSS 9 10 E7 BLOCK DIAGRAM VDD KEYBOARD E1 E2 E3 E4 E5 E6 E7 E8 17 2 1 16 15 14 10 11 A4 A3 A2 A1 E9 18 MUX 8 OUTPUT CONTROL ENCODER 7–BIT SR 3 SEQUENCE CONTROL 3–BIT LATCH DIVIDER ÷ 10/12 STANDBY 7 6 5 4 DIVIDER ÷ 32 SCANNER DIVIDER ÷ 16 OSC FK3 IN FK1 9 12 OUT 13 500 kHz CERAMIC RESONATOR SAME AS IN DL136/D R3 Motorola, Inc. 1995 MOTOROLA MC14497 1 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ MAXIMUM RATINGS (Voltages referenced to VSS) Parameter DC Supply Voltage Input Voltage, All Inputs DC Current Drain per Pin Operating Temperature Range Storage Temperature Range Symbol Value Unit VDD – 0.5 to + 18 V Vin – 0.5 to VDD + 0.5 V I 10 mA TA – 40 to + 85 °C Tstg – 65 to + 150 °C This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is advised that normal precautions be taken to avoid application of any 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. ELECTRICAL CHARACTERISTICS (TA = 0 to 70°C; all Voltages Referenced to VSS) Symbol VDD Min Max Unit Supply Voltage VDD — 4.0 10.0 V Supply Current Idle Operation IDD 10 10 — — 50 5 µA mA Characteristic µA Output Current — Signal VOH = 3.0 V VOL = 0.5 V Source Sink IOH IOL 4 4 – 900 120 — — Output Current — Scanner VOH = 3.0 V VOL = 0.5 V Source Sink IOH IOL 4 4 – 30 245 — — Output Current — Oscillator VOH = 3.0 V VOL = 0.5 V Source Sink IOH IOL 4 4 – 300 245 — — 10 4 ±2 30 ± 80 — 10 4 – 15 — — – 60 10 10 4 4 9 — 3 — — 1.2 — 1.0 µA µA Input Current — Oscillator Operation Idle, VIL = 0.5 V Iin Input Current — Encoder VIH = 9.0 V VIL = 0.5 V Iin Input Voltage — Encoder VIH VIL VIH VIL MC14497 2 µA µA V MOTOROLA CIRCUIT OPERATION The transmitter sends a 6–bit, labelled A (LSB) to F (MSB), binary code giving a total of 64 possible combinations or code words. All of these channels are user selectable, except the last two (where channel 63 is not sent while channel 62 is automatically sent by the transmitter at the end of each transmission as an “End of Transmission” code). In either mode, FSK or AM, the transmitted signal is in the form of a bi–phase pulse code modulation (PCM) signal. The AM coding is shown in Figure 1. BIT–n f1 to make an intermediate keyboard with between 32 and 64 keys. The other two switches in the Block Diagram (FK1 and FK2) change the modulation mode. Closing FK1 changes the modulation from FSK to AM and the start–bit polarity. Closing FK2 changes the start–bit to a logical 0. The full range of options available is illustrated in Table 1. Table 1. Start Bit Modulation Bit–F Channels E9 = Open 1 FSK 0 0 – 31 E9 = A1 (FK1) 1 AM 0 0 – 31 E9 = A2 (FK2) 0 FSK 0 0 – 31* E9 = A3 (FK3) 1 FSK 1 32 – 61 E9 = A1 • A2 0 AM 0 0 – 31 E9 = A1 • A3 1 AM 1 32 – 61 E9 = A2 • A3 0 FSK 1 32 – 61* E9 = A1 • A2 • A3 0 AM 1 32 – 61 “0” AM f1 “1” Figure 1. AM Coding In the AM mode, f1 is a train of pulses at the modulating frequency of 31.25 kHz for a reference frequency of 500 kHz. In the FSK mode, two modulating frequencies are used as shown in Figure 2. BIT–n f2 f3 f3 f2 “0” FSK “1” Figure 2. FSK Coding In this mode, f3 is 50 kHz and f2 is 41.66 kHz for a reference frequency of 500 kHz. The keyboard can be a simple switch matrix using no external diodes, connected to the four scanner inputs (A1 – A4) and the eight row input (E1 – E8). Under these conditions, only the first 32 code words are available since bit–F is always at logical 0. However, a simple 2–pole changeover switch, in the manner of a typewriter “shift” key (switch FK3 in the Block Diagram) can be used to change the polarity of bit–F to give access to the next full set of 32 instructions. An alternative method of accessing more than 32 instructions is by the use of external diodes between the address inputs (see Figure 3). These have the effect of producing “phantom” address inputs by pulling two inputs low at the same time, which causes bit–F to go high (i.e., to logical 1). By interconnecting only certain address inputs it is possible MOTOROLA * Not allowed. One of the transmitter’s major features is its low power consumption (in the order of 10 µA in the idle state). For this reason, the battery is perpetually in circuit. It has in fact been found that a light discharge current is beneficial to battery life. In its active state, the transmitter efficiency is increased by the use of a low duty cycle which is less than 2.5% for the modulating pulse trains. While no key is pressed, the circuit is in its idle state and the reference oscillator is stopped. Also, the eight address input lines are held high through internal pull–up resistors. As soon as a key is pressed, this takes the appropriate address line low, signaling to the circuit that a key has been selected. The oscillator is now enabled. If the key is released before the code word has been sent, the circuit returns to its idle state. To account for accidental activation of the transmitter, the circuit has a built–in reactive time of approximately 20 ms, which also overcomes contact bounce. After this delay, the code word will be sent and repeated at 90 ms intervals for as long as the key is pressed. As soon as the key is released, the circuit automatically sends channel 62, the “End of Transmission” (EOT) code. The transmitter then returns to its idle state. The differences between the two modulation modes are illustrated in Figure 4. However, it should be noted that in the AM mode, each transmitted word is preceded by a burst of pulses lasting 512 µs. This is used to set up the AGC loop in the receiver’s preamp. In the FSK mode, the first frequency of the first bit is extended by 1.5 ms and the AGC burst is suppressed. In either mode, it is assumed that the normal start–bit is present. MC14497 3 PIN DESCRIPTIONS VSS E1 E1 – E8 Row Inputs (Pins 1, 2, 10, 11, 14, 15, 16, 17) 17 VDD 18 9 E1a Under idle conditions, these inputs are held high by internal pull–up resistors. As soon as a key is pressed, a logical 0 on that particular line signals to the circuit that a key has been selected. After a delay of 20 ms, the internal register is loaded with the code word for the key selected. E2 2 E2a E3 E9 Row Input (Pin 3) 1 E3a This is a special programming input and when connected to the appropriate scanner output via a diode, it will modify the transmitted output according to Table NO TAG. In Table NO TAG, the figures in brackets (FK1, etc.) refer to the switches shown in the Block Diagram and Figure 3. If only one option is required, the diode may be omitted. The connections shown in Table NO TAG may be made in any combination. Although E9 is a row input, forcing this line low will not activate the circuit. E4 16 E4a E5 15 E5a E6 A1 – A4 Scanner Outputs (Pins 4 – 7) 14 E6a Under idle conditions, these outputs are held low, logical 0. When a key is pressed, the circuit is activated and the oscillator will start and release the outputs (see Figure 5). E7 E7a OSCin, OSCout Oscillator Input and Oscillator Output (Pins 12, 13) E8 A1 7 A2 6 A3 5 A4 4 SIGNAL OUT Signal Output (Pin 8) FK2 3 FK1 13 12 E9 This output provides the modulating signal ready to drive the modulation amplifier. If required, the transmitter can be used as a keyboard encoder for direct use with a receiver. In this case, the AM option is selected, the output inverted, and fed directly to the receiver’s signal input pin. A 11 E8a These pins are designed to operate with a 500 kHz ceramic resonator or a tune LC circuit. It is important that a ceramic resonator and not a filter be used here, as the oscillator frequency cannot be guaranteed if a ceramic filter is used. START BIT 10 C1 NOTE: Maximum key contact resistance = 1 kΩ . C2 Figure 3. 64–Key Keyboard B C D E F INSTRUCTION FSK AM f3 f1 f2 f1 KEY WORD f3 f1 f2 f3 f2 f1 f3 f2 f1 f3 f1 ONE WORD DEBOUNCE 9 ms 20 ms 99 ms Figure 4. Transmitted Waveforms and Timing (Not Drawn to Scale) MC14497 4 MOTOROLA KEY DOWN KEY RELEASED DEBOUNCE A1 A2 A3 A4 Figure 5. Scanner Output Timing Diagram 1500 µF 100 Ω 9V 0.1 Ω 1N4001 100 Ω * 18 1 kΩ MC14497 KEYBOARD 9 12 8 13 * Visible Indicator C1 C2 C1 and C2 are sized per the ceramic resonator supplier’s recommendation. Ceramic Resonator Suppliers: 1. Morgan Matrox, Inc., Bedford, OH, 216/232–8600 2. Radio Materials Co., Attica, IN, 317/762–2491 Motorola cannot recommend one supplier over another and in no way suggests that this is a complete listing of ceramic resonator suppliers. Figure 6. Typical Application Circuit MOTOROLA MC14497 5 AGC BURST START BIT f4 A f4 2.84 ms 1.155 ms 540 µs B C D E f4 f4 f4 f4 1.1 ms 590 µs 590 µs 590 µs 540 µs 540 µs 540 µs F f4 1.16 ms 540 µs 540 µs NOTES: 1. f4 = 28.4 kHz. 2. Indicated time durations are approximated. Figure 7. AM Mode Transmitted Wavetrain with 455 kHz Oscillator Table 2. Transmitted Codes Code Word Keyboard Code Word Keyboard Channel F E D C B A In Out Channel F E D C B A In Out 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 0 0 0 1 0 1 1 0 0 1 1 1 1 1 0 1 1 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 Not Transmitted 0 1 A4 A4 A4 A4 A4 A4 A4 A4 A1 A1 A1 A1 A1 A1 A1 A1 A3 A3 A3 A3 A3 A3 A3 A3 A2 A2 A2 A2 A2 A2 A2 A2 1 0 E8 E1 E2 E3 E4 E5 E6 E7 E8 E1 E2 E3 E4 E5 E6 E7 E8 E1 E2 E3 E4 E5 E6 E7 E8 E1 E2 E3 E4 E5 E6 E7 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 E8a E1a E2a E3a E4a E5a E6a E7a E8a E1a E2a E3a E4a E5a E6a E7a E8a E1a E2a E3a E4a E5a E6a E7a E8a E1a E2a E3a E4a E5a E6a E7a A4 A4 A4 A4 A4 A4 A4 A4 A1 A1 A1 A1 A1 A1 A1 A1 A3 A3 A3 A3 A3 A3 A3 A3 A2 A2 A2 A2 A2 A2 A2 A2 NOTE: Although the “a” suffix applies to a phantom input when using a keyboard with up to 64 keys, the coding is identical with a 32–key keyboard when switch FK3 is closed. MC14497 6 MOTOROLA PACKAGE DIMENSIONS P SUFFIX PLASTIC DIP CASE 707–02 18 NOTES: 1. POSITIONAL TOLERANCE OF LEADS (D), SHALL BE WITHIN 0.25 (0.010) AT MAXIMUM MATERIAL CONDITION, IN RELATION TO SEATING PLANE AND EACH OTHER. 2. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 3. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 10 B 1 9 A L C N F H MOTOROLA D G SEATING PLANE K M J DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 22.22 23.24 6.10 6.60 3.56 4.57 0.36 0.56 1.27 1.78 2.54 BSC 1.02 1.52 0.20 0.30 2.92 3.43 7.62 BSC 15° 0° 0.51 1.02 INCHES MIN MAX 0.875 0.915 0.240 0.260 0.140 0.180 0.014 0.022 0.050 0.070 0.100 BSC 0.040 0.060 0.008 0.012 0.115 0.135 0.300 BSC 0° 15° 0.020 0.040 MC14497 7 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. “Typical” parameters can and do vary in different applications. All operating parameters, including “Typicals” 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 officers, employees, subsidiaries, affiliates, 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/Affirmative Action Employer. How to reach us: USA/EUROPE: Motorola Literature Distribution; P.O. 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 MC14497 8 ◊ *MC14497/D* MC14497/D MOTOROLA