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THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
APRIL 1995
3056-1.3
SL490B
REMOTE CONTROL TRANSMITTER
(Supersedes version in April 1994 Consumer IC Handbook, 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 is an easily extendable, 32-command PPM transmitter drawing negligible standby current.
0V AND XXX00 OUTPUT 1 2 3 4 18 17 16 15
CARRIER TIME CONSTANT REGULATED VOLTAGE, VREG PPM TIME CONSTANT

VCC (19V)
SL490B
5 6 7 8 9 14 13 12 11 10
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 19*5V 600mW 210C to 160C 255C to1150C
SELECTION MATRIX CURRENT SOURCES
000XX 001XX 010XX 011XX 100XX
SELECTION MATRIX XXX10 CURRENT SINKS XXX11
XXX01 111XX 110XX 101XX
SELECTION MATRIX CURRENT SOURCES
DP18
Fig. 1 Pin connections - top view
QUICK REFERENCE DATA s Power Supply: 9V Standby 6A, 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 NA DP
SWITCH MATRIX CURRENT SOURCES

5 6 7 8 9 10 11 12 13 14 15 1
SWITCH CURRENT SELECTOR SUPPLY SWITCH AND REGULATOR OUTPUT AMPLIFIER
4
VCC
17 2
VREG
PPM OUTPUT
ROW ENCODER CODE REGISTER MULTIPLEX
3
PULSE POSITION MODULATOR COLUMN ENCODER 3-BIT COUNTER CARRIER OSCILLATOR
16
PPM TIME CONSTANT
SWITCH MATRIX CURRENT SINKS
18
0V
CARRIER TIME CONSTANT
Fig. 2 SL486 block diagram
SL490B
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = 125C, VCC = 17V to 110*5V. Test circuit: Fig. 4. Timings are defined in Fig. 3. Characteristic 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 Pin Min. 4 4 17 17 2,3 2 3 5-15 18 16 2,3 Value Typ. 9*5 4*1 VCC21 1 1 5 80 60 610 610 64 64 1*6 0*22t1 3t1 Max. 16 10 4*9 1 mA A V mA V V V k k k % % % % VCC = 9*5V Units Conditions
R1 = 15k t1 = 0*95C1R1, see R1 = 60k Fig. 4
2,3 2,3 2,3 2,3 2,3
DVCC = 3*5V (7V to 10*5V)
1*4 0*11t1
Derived by counting
t1
t0
tP
tg
1
0
1
1
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 100 101 110 111 10 11 12 13 14 15 C1 0*22 C2 680p 15k R1 R2 40k 100k 1 16 17 18 9 8 7 6 110V VCC 0*1 1*8k 900
SL490B
5 4 3 2
t1 0*95 C1 R1 fc
1 -- 0*7 C2 R2
0*1 1
Fig. 4 Test circuit
2

20 15
40 30
C2 = 680pF, fC 50kHz; see Fig. 4

Unloaded I2 = 10mA I3 = 5mA
peak value ,1ms
TO SCOPE
SL490B
834 KEYPAD
10 11 12 13 14 15 9 8 7 6
SL490B
5 4 3 2 1 TR1 BC327 TR2 BD437 D1 D2 2 3 CQY99 OR 1 3 CQX47 C3 68n R3 100 150 10V
1
9V (PP3)
R1
15k 47k
C1 0*22, 5% C2 4*7, 6V R2 2*2k
16 17 18
2
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 are differentated by C3 and R3 and amplified by TR1 to produce current pulses about 15s 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 connected in series. Improved output can be obtained by using four CQY99 diodes in a series/parallel arrangement, but it is usually simpler to use two multi-chip diodes such as the CQX47 connected in parallel or a single CQX19, which gives similar results. A significant increase in range can be obtained by using diodes such as the 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.
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SL490B
PACKAGE DETAILS
Dimensions are shown thus: mm (in)
1 7*11 (0*28) MAX 18 0*23/0*41 (0*009/0*016) PIN 1 REF NOTCH 7*62 (0*3) NOM CTRS
1*14/1*65 (0*045/0*065) 25*40 (1*000) MAX 5*08/(0*20) MAX SEATING PLANE
0*51 (0*02) 3*05 (0*120) MIN MIN
0*38/0*61 (0*015/0*24)
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 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 United States of America. Tel (408) 438 2900 Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES q FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Fax : (1) 64 46 06 07 q GERMANY Munich Tel: (089) 3609 06-0 Fax : (089) 3609 06-55 q ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 q JAPAN Tokyo Tel: (3) 5276-5501 Fax: (3) 5276-5510 q NORTH AMERICA Scotts Valley, USA Tel: (408) 438 2900 Fax: (408) 438 7023. q SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 q SWEDEN Stockholm Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 q UK, EIRE, DENMARK, FINLAND & NORWAY Swindon Tel: (0793) 518510 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) GEC Plessey Semiconductors 1994 Publication No. DS3056 Issue No. 1.3 April 1995
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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