(631) 271-0400 (631) 271-0405 Computer Systems, Inc. 1235 Walt Wh

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(631) 271-0400 (631) 271-0405 Computer Systems, Inc. 1235 Walt Wh

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LS7232NT
(631) 271-0400 (631) 271-0405
Computer Systems, Inc. 1235 Walt Whitman Road, Melville, 11747
A3800
PROXIMITY/TOUCH CONTROL HALOGEN LAMP DIMMER
FEATURES: Control incandescent transformer-coupled voltage halogen lamps. No-Touch lamp control through optical sensing synchronization wall switch application. Extension input remote control Safety-shutdown transformer malfunction. Pin-selectable operating modes Single power supply 50Hz/60Hz line frequency LS7232NT (DIP); LS7232NT-S (SOIC) Figure DESCRIPTION: LS7232NT CMOS integrated circuit designed brightness control incandescent lamps tranformer coupled voltage halogen lamps. brightness controlled controlling firing angle triac series with lamp triggered LS7232NT. Phase-Locked-Loop keeps LS7232NT phase pointer locked phase with line voltage. unique optical user interface provides smooth control lamp intensity without need touching sensor plate. mechanical switch interface dimming control also provided which used remote touch plate. includes features address problems associated with inductive loads such transformers voltage halogen lamp application. voltage current phase resulting from inductance prevent triac from shutting zero crossover and/or prevent triac from maintaining conduction following removal gate trigger. inductive load problems addressed LS7232NT follows: Compensation delayed triac cut-off. When trigger pulse occur conduction angle which coincides with on-state triac, trigger pulse delayed until triac turned off. This eliminates underlying cause half-waving. Compensation delayed triac turn-on. conduction angle, triac trigger pulse 130.2µs (60Hz) issued dimmer triac fails fire, second trigger pulse 260.4µs width issued later second attempt fire triac during same halfcycle. Safety-Shutdown. frequency occurrences delayed cut-off delayed turn-on exceeds preset threshold, shutdown initiated turning triac trigger pulses. safety-shutdown threshold value accumulated 4-bit Up/Down counter. count increments every occurrence delayed cut-off delayed turn-on decrements once every SYNC pulses line cycles). count will decrement below zero. count reaches safety-shut-down effected.
7232NT-012703-1
January 2003
ASSIGNMENT VIEW
SYNC ANODE CATHODE PHOTOUT SENS REMOTE LS7232NT (+V) LEDO TRIG/ (-V)
FIGURE
LS7232NT configured different modes dimming timing functions selected 3-state mode pins. INPUT/OUTPUT DESCRIPTION: (Pin filter capacitor input. 0.02µF capacitor required this input optimal operation PLL. SYNC (Pin phase pointer triac trigger signal synchronized with 50Hz/60Hz voltage applied SYNC input internal PLL. triac On/Off status information also derived from this input. ANODE (Pin CATHODE (Pin PHOTOUT (Pin These three pins constitute input/outputs transconductance voltage amplifier pair (See Fig. converting current from photo-diode voltage stimulus application SENS input. photo-signal used lieu touch plate touchless dimmer system. output PHOTOUT governed following equation: VOUT VDD/2 2IDRf Where Supply Voltage Current Photo-diode connected between ANODE CATHODE Feedback resistance between PHOTOUT CATHODE potentiometer used controlling sensitivity photo-amplifier system.
SENS (Pin positive signal applied SENS input controls turn-on, turn-off dimming function LS7232NT. SENS input designed operate with very levels signal, that directly interfaced with photoamplifier output. Signal SENS input amplified with gain photosensor used, SENS input easily adapted touch plate. Signals SENS input classified SHORT touch LONG touch. Signals between 50ms 350ms constitute SHORT touch, whereas signals longer than 350ms constitute LONG touch. functions these types touches explained mode description section. SENS input internal pull-down resistor 10k. REMOTE (Pin performing dimming operation from remote sites through wire extensions, REMOTE input used. This input sampled twice during both negative positive half cycles rendering more immune noise hence more suited carrying signals over extension wires. (Pin Supply voltage, negative terminal.
MODE Same effect Short Touch Mode Long Touch causes output sweep between conduction angles (Min) 155° (Max) increments 1.4°. sweep direction automatically reverses Max. Sweep direction also reverses every Long Touch. Trailing edge sensing Short Touch. (Change occurs upon removal touch.) MODE Same Mode except Short Touch output toggles between Memory. Memory updated with long touch. MODE Same Mode except operation with Short Touch delayed. termination Short Touch output level instantaneously drops amount indicate beginning turn-off delay, delay, output slews rate 56°/s. delay controlled resistorcapacitor pair (Pin input, according following expression: 63RC magnitude dependent pre-touch intensity from where turn-off delay initiated have values Table (See Fig. MODE Same Mode except Short Touch state switches output memory. MODE Same Mode except that there dimming function Mode Both Short Long touches operate Short Touch (leading edge touch sense). MODE Output switches from with either Short Long Touch (leading edge touch sense). After delay 63RC (See description Mode output drops angle according Table After another fixed delay 10sec output slews 2sec (td7) rate 56°/sec. touch during time effect. touch during timeouts aborts timeout restores output Max. TABLE OPERATING MODES
MODE DESCRIPTION DIMMER MEMORY DIMMER DELAYED_OFF DIMMER DELAYED_OFF MEMORY-DIMMER DELAYED_OFF AUTO_OFF_TIMER ALLOWED ALLOWED
TRIG/ (Pin
Trigger ouput driving gate triac. negative pulse nominally 130.2µs duration generated this output which varied between 19.7° 119.5° from zerocrossover during every half cycle. control conduction angle TRIG/ output effected Short Long touches SENSE REMOTE inputs. LEDO (Pin positive pulse 32µs generated this output during every negative half-cycle TRIG/ output Off, LEDO generated nominally 911µs after zerocrossover negative half-cycles. TRIG/ output LEDO tracks TRIG/ output signal generated 170µs ahead TRIG/ output, during every negative halfcycle LEDO used drive infra-red LED. When reflecting object, such human hand, brought close infrared LED, light reflected back Photo-diode, which mounted physical proximity infra-red LED. change intensity received light photo-diode results change photo-diode current which turn amplified transconductance amplifier described ANODE input section. (Pin resistor-capacitor pair connected externally input constitutes timing element delay generation Modes delay given expression, 63RC. (Pin Each these inputs 3-state inputs, namely (L), High Float (F). logic levels these inputs together, configures operating modes LS7232NT according Table MODE DESCRIPTIONS: Figures further explanations. MODE Touch causes TRIG/ output toggle between Max. transition slews 350ms(tr). Long Short Touch operate identical manner. Leading edge touch sense (change occurs upon initiation touch)
7232NT-012703-2
TABLE BRIGHTNESS DROP DELAY START,
PRE-TOUCH CONDUCTION ANGLE 155° 130° 129° 115° 114° -35° -25° -20° -10° Instantaneous
ABSOLUTE MAXIMUM RATINGS: PARAMETER SYMBOL Supply Voltage Input Voltage Operating Temperature Storage Temperature TSTG ELECTRICAL CHARACTERISTICS: PARAMETER Supply Voltage Supply Current Input Logic Levels: SYNC SYNC REMOTE REMOTE SENS SENS Output Current: LEDO Sink LEDO Source TRIG/ Sink Sink
VALUE +150
UNIT
25°C, +5V, voltages referenced Vss) UNIT CONDITION Output unloaded
SYMBOL
-1.0 10.0 -35.0 -3.0
-1.5 14.0 -4.0
0.5V 2.2V 3.5V 2.0V
TRANSIENT CHARACTERISTICS (See Figures time parameters based 60Hz SYNC. 50Hz multiplication factor should used. PARAMETER SYNC Frequency Short Touch Long Touch TRIG/ Pulse Width Conduction Range increments SYMBOL 130.2 infinite UNIT CONDITION
Short Touch: (Slew Time) Long Touch: Ramp Time between Ramp Time between 155° Dwell
2.27
7232NT-012703-3
PARAMETER Timer Resistor Timer Capacitor Timer Delay Slew Rate Slew Delay Pre-Off Delay (Mode Slew-Off Delay (Mode LEDO Pulse Width SYNC LEDO delay LEDO TRIG/ delay LEDO Strobe delay
SYMBOL
1e-3
10.0
1200
UNIT deg/sec deg/sec
CONDITION 63RC 60Hz 50Hz
SYNC (Idealized)
TRIG/
LEDO
SENS_STROBE (Internal) NOTE: Pulse associated sens_strobe occurs only when TRIG/ Pulse associated sens_strobe occurs only when TRIG/
FIGURE TRIG/ CONDUCTION ANGLE, DEFINITION LEDO PULSE
information included herein believed accurate reliable. However, Computer Systems, Inc. assumes responsibilities inaccuracies, infringements patent rights others which result from use.
7232NT-012703-4
SHORT SHORT
LONG
SHORT
SHORT
LONG
LONG
SHORT
LONG
SENS MODE
MODE
MEMORY
MEMORY
MODE
FIGURE MODES
SHORT SHORT SENS
SHORT SHORT
SHORT
LONG
SHORT
SHORT
MODE
MEMORY
MEMORY
MODE
FIGURE MODES
SHORT SHORT
SHORT
SHORT
SENS
MODE MODE
7232NT-012703-5
FIGURE MODES
SYNC
PHASE LOCK LOOP
CONTROL
PHASE MEMORY
TRIAC STATUS POINTER SENS
DIGITAL COMPARATOR
TRIGGER LOGIC
DRIVER
TRIG/
GAIN=30
PULSE LOGIC PHOTOUT
DRIVER
LEDO
CATHODE
ANODE
REMOTE
DECODER
TIMER
FIGURE LS7232NT BLOCK DIAGRAM
FIGURE PHOTO AMPLIFIER WITH PHOTO DIODE GAIN RESISTOR
VDD/2 100K
100K
VOUT VDD/2 2IDRf ANODE CATHODE PHOTOUT (VOUT
7232NT-012703-6
FIGURE TYPICAL DIMMER CIRCUIT WITH NO-TOUCH OPTICAL SENSING TOUCH PLATE OPTIONS
LEDO
TRIG/
NOTE
CATHODE
REMOTE
ANODE SYNC
PHOTOUT
115VAC 220VAC
TOUCH PLATE
LS7232NT
SENS
TOUCH PLATE
LOAD NOTES No-Touch system, infra-red transmit diode receive should placed physical proximity that when hand placed front reflected light from hand received receiver produce touch impulse. touchplate used following parts should infrared detector used following parts should remote sensing used following parts removed: R10, R11, R12, R13, remote sensing used these parts should connection between must broken. load either incandescent lamp primary step-down transformer voltage halogen lamp.
115V
0.1µF 10µF, 0.15µF, 200V 0.22µF, 200V 0.02µF, 0.002µF, 200µF, 0.1µF, 0.003µF, 0.1µF, 270, 1/2W 680k, 1/4W 1.5M, 1/4W 500k, 1/8W Pot. 1/4W 1/4W 1/4W 1/4W 2.7M, 1/4W R10, 2.7M, 1/4W 200k, 1/4W 1/4W 1/4W IN4148 SFH20S, Receiver diode LD271, Transmitter diode IN4148 5.6V, (Zener) Q2004L4 Triac (Typical) 100µF, Filter MPS8099, MPS8599
220V
components same 115V except listed below: 0.15µF, 400V 0.22µF, 400V 1.5M, 1/4W 4.7M, 1/4W Q4004L4 Triac (Typical) 200µF, Filter
7232NT-012703-7

(631) 271-0400 (631) 271-0405 Computer Systems, Inc. 1235 Walt Wh

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