SL490B HB3120 XXX01 XXX10 XXX11 111XX 110XX 101XX 000XX 001XX 010XX 011XX 100XX

PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS APRIL 1995 3056-1.3 SL490B REMOTE CONTROL TRANSMITTER (Supersedes version in

THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS APRIL 1995 3056-1.3 SL490B SL490B REMOTE CONTROL TRANSMITTER (Supersedes version in April 1994 Consumer IC Handbook, HB3120 HB3120 - 2.0) GPS has developed and produced a range of monolithic integrated circuits which give a wide variety of remote control facilities. As well as ultrasonic or infra-red transmission, cable, radio or telephone links may also be used. Pulse Position Modulation (PPM) is used with or without carrier and automatic error detection is incorporated. Initially designed with TV remote control in mind, the device is also suitable for use in radios, tuners, tape and record decks, lamps and lighting, toys and models, industrial control and monitoring. The SL490B SL490B is an easily extendable, 32-command PPM transmitter drawing negligible standby current. FEATURES s Ultrasonic or Infra-Red Transmission s Direct Drive or Ultrasonic Transducer s Direct Drive of Visible LED when using Infra-Red s Very Low Power Requirements s Pulse Position Modulation gives Excellent Immunity from Noise and Multipath Reflections s Single Pole Key Matrix s Switch Resistance up to 1k Tolerated s Low External Component Count s On-Chip Anti-Bounce Circuitry ABSOLUTE MAXIMUM RATINGS Supply voltage, VCC Total power dissipation Operating temperature range Storage temperature range SWITCH MATRIX CURRENT SOURCES SWITCH MATRIX CURRENT SINKS OUTPUT SELECTION MATRIX CURRENT SOURCES 18 CARRIER TIME CONSTANT 2 17 REGULATED VOLTAGE, VREG 3 16 PPM TIME CONSTANT 4 15 XXX01 XXX01 5 14 6 13 SELECTION MATRIX XXX10 XXX10 CURRENT SINKS XXX11 XXX11 7 12 111XX 111XX 8 11 110XX 110XX 9 10 101XX 101XX SL490B SL490B Fig. 1 Pin connections - top view QUICK REFERENCE DATA s Power Supply: 9V Standby 6µA, Operating 8mA s Modulation: Pulse Position with or without Carrier s Coding: 5-Bit Word giving a Primary Command Set of 32 Commands s Key Entry: 8 3 4 Single Pole Key Matrix s Data Rate: Selectable 1Bit/Sec to 10kBit/Sec. s Carrier Frequency: Selectable 0Hz (No Carrier) to 200kHz ORDERING INFORMATION SL490B SL490B NA DP 13 8 17 2 3 CODE REGISTER 11 VCC VREG PPM OUTPUT MULTIPLEX PULSE POSITION MODULATOR 12 COLUMN ENCODER 4 OUTPUT AMPLIFIER ROW ENCODER 10 SELECTION MATRIX CURRENT SOURCES DP18 SUPPLY SWITCH AND REGULATOR 7 14 000XX 000XX 001XX 001XX 010XX 010XX 011XX 011XX 100XX 100XX 1 SWITCH CURRENT SELECTOR 6 9 VCC (19V) 5 19·5V 600mW 210°C to 160°C 255°C to1150°C 0V AND XXX00 XXX00 16 PPM TIME CONSTANT 3-BIT COUNTER 15 1 CARRIER OSCILLATOR 0V Fig. 2 SL486 SL486 block diagram 18 CARRIER TIME CONSTANT SL490B SL490B ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = 125°C, VCC = 17V to 110·5V. Test circuit: Fig. 4. Timings are defined in Fig. 3. Value 4 4 17 17 2,3 2 3 5-15 18 16 2,3 9·5 2,3 2,3 2,3 2,3 2,3 t1 0 4·1 VCC21 VCC21 1 1 5 80 60 610 610 40 30 20 15 64 64 1·6 0·22t1 1·4 0·11t1 mA µA V mA V V V k k k % % 1 Unloaded I2 = 10mA I3 = 5mA peak value ,1ms C2 = 680pF, fC 50kHz; see Fig. 4 R1 = 15k t1 = 0·95C1R1 95C1R1, see R1 = 60k Fig. 4 DVCC = 3·5V (7V to 10·5V) Derived by counting tP 1 VCC = 9·5V % % 3t1 t0 1 16 10 4·9 1 Conditions Max. Operating supply current Standby supply current Regulated voltage, VREG Regulator output current, IREG Output voltage swing Output voltage Output voltage Keypad switch resistance Carrier time constant resistor, R2 PPM time constant resistor, R1 t1 deviation from calculated value, using fixed timing components Variation of t1 and t0 with VCC Dt1 Dt0 Ratio t0/t1 Pulse width, tP Interword gap, tg Units Typ. Min. Pin Characteristic tg 0 1 0 Fig. 3 PPM word notation and timing definitions BA BA BA BA 00 01 10 11 EDC 000 001 010 011 = 5k 100 101 10 9 110 11 8 111 12 7 6 13 14 SL490B SL490B 5 15 t1 0·95 C1 R1 1 - 0·7 C2 R2 fc 16 15k R1 R2 40k 100k 1 1µ 900 0·1µ TO SCOPE 0·1µ Fig. 4 Test circuit 2 1·8k 2 18 VCC 3 17 C1 0·22µ C2 680p 4 110V SL490B SL490B 834 KEYPAD 10 9 11 8 12 7 6 13 14 SL490B SL490B 5 15 R1 15k 47k 16 3 17 2 18 C1 0·22µ, 5% C2 4·7µ, 6V 4 1 C3 68n R3 100 150µ 10V 1 9V (PP3) TR1 BC327 BC327 TR2 BD437 BD437 R2 2·2k D1 D2 2 2 3 CQY99 CQY99 OR 1 3 CQX47 CQX47 Fig. 5 Infra-red application circuit OPERATING NOTES Fig. 5 shows the circuit for a simple infra-red transmitter where the PPM output pulses from pin 2 of the SL490B SL490B are differentated by C3 and R3 and amplified by TR1 to produce current pulses about 15µs wide.These pulses are further amplified by TR2 and applied to the infra-red diodes D1 and D2. The current in the diodes and the infra-red output is controlled by the quantity, type, and connection method of the diodes and also by the gain, at high currents, of the transistors. The most common solution where cost is important is to use two single-chip diodes, such as the CQY99 CQY99 connected in series. Improved output can be obtained by using four CQY99 CQY99 diodes in a series/parallel arrangement, but it is usually simpler to use two multi-chip diodes such as the CQX47 CQX47 connected in parallel or a single CQX19 CQX19, which gives similar results. A significant increase in range can be obtained by using diodes such as the CQY99 CQY99 in conjunction with a plated plastic parabolic reflector. When building the transmitter, care should be taken with the choice of the capacitor C4 and with the circuit layout, particularly when multi-chip diodes are being used, as the current pulses can be as high as 6 to 8A. Transistor choice is also important and any substitutes should have high current gain characteristics and switching speeds compatible with the application. An increase in output can be obtained by connecting TR2 in common emitter configuration, but care should be taken not to exceed the rating of the diodes. Choice of PPM Frequency When the transmitter is being used with an infra-red link, with high current pulses fed to the diodes as in Fig. 5, power consumption will increase with frequency. It is thus advisable that, with a battery power supply, the slowest PPM rate consistent with adequate response time should be chosen. 3 SL490B SL490B PACKAGE DETAILS Dimensions are shown thus: mm (in) 1 PIN 1 REF NOTCH 7·11 (0·28) MAX 7·62 (0·3) NOM CTRS 18 1·14/1·65 (0·045/0·065) 0·23/0·41 (0·009/0·016) 25·40 (1·000) MAX 5·08/(0·20) MAX SEATING PLANE 0·38/0·61 (0·015/0·24) 0·51 (0·02) 3·05 (0·120) MIN MIN 18 LEADS AT 2·54 (0·10) NOM. SPACING NOTES 1. Controlling dimensions are inches. 2. This package outline diagram is for guidance only. Please contact your GPS Customer Service Centre for further information. 18-LEAD 18-LEAD PLASTIC DIL DP18 HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (0793) 518000 Fax: (0793) 518411 GEC PLESSEY SEMICONDUCTORS P.O. Box 660017 1500 Green Hills Road, Scotts Valley, CA95067-0017 CA95067-0017 United States of America. 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