LSI/CSI LS7232ND TOUCH CONTROL LAMP DIMMER. LSI Computer Systems, Inc Walt Whitman Road, Melville, NY (631) FAX (631)

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1 LSI/CSI UL LSI Computer Systems, Inc. 35 Walt Whitman Road, Melville, NY 747 (63) FAX (63) A3800 TOUCH CONTROL LAM DIMMER January 003 FEATURES: hase-lock loop synchronization allows use in Wall Switch applications. rovides brightness control of incandescent lamps with touch plates or pushbutton switches. Controls the duty cycle from 3% to 88% (conduction angles for AC half-cycles between 4 and 58, respectively.) Operates at 50Hz/60Hz line frequency. Extension input for remote activation. +V to +8V ower Supply voltage (VSS - VDD). (DI); -S (SOIC ) - See Figure DESCRITION: is a MOS integrated circuit designed to control brightness of incandescent lamps. The output of this IC controls the brightness of a lamp by controlling the firing angle of a triac connected in series with the lamp. All internal timings are synchronized with the line frequency by means of a built-in phaselock loop circuit. The output occurs once every half-cycle of the line frequency. Within the half-cycle, the output can be positioned anywhere between 58 conduction angle for maximum brightness and 4 conduction angle for minimum brightness in relation to the AC line frequency. The positioning of the output is controlled by applying a low level at the SENS input or a high level at the EXT input. These functions may be implemented with very few interface components, as shown in Figure 5. When implemented in this manner, touching of the Touch late causes the lamp brightness to change as follows:. If the Touch late is touched momentarily (4ms to 333ms), the lamp is: a) turned off if it was on, b) turned on if it was off. The brightness resulting is either full brightness or, depending on the mode, a previous brightness stored in the IC memory.. If the Touch late is touched for a prolonged time (more than 34ms) the light intensity changes slowly. As long as the touch is maintained, the change continues; the direction of change reverses whenever the maximum or minimum brightness is reached. INUT/OUTUT DESCRITION: VSS (in ) Supply voltage positive terminal. MODE (in ) The can operate in either of 3 modes, Mode 0, Mode or Mode. A full description of the operating modes is provided in Table. The MODE input level selects the operating mode as follows: VSS (+V) MODE IN ASSIGNMENT - TO VIEW CA LSI 3 4 FIGURE V DD (-V) EXT SENS MODE Input Mode Functional Equivalent* VDD 0 LS73 Vss LS73 Float LS733 *NOTE: The can replace LS73, LS73 and LS733 where the DOZE input is not used. The LS73 CB requires no change. The LS733 CB requires that the in connection be opened. The LS73 CB requires that the in connection be made to VDD instead of Vss. CA (in 3) The CA input is for the LL filter capacitor. A 0.047µF capacitor should be connected to this input. (in 4) The AC Line Frequency is applied to this input through an external RC circuit (See Figure 5). The hase-lock Loop in the IC synchronizes all internal timings to the AC signal at the input. SENS (in 5) A low level activates this input (See Table ) which controls the turn-on, turn-off and conduction angle, Ø (See Figure 3), of the signal with respect to the input. EXT (in 6) The EXT input is functionally identical to the SENS input except that a high level activates this input. It is recommended that the EXT input be used instead of the SENS input when long extension wires are employed between the IC and the Sensing Circuitry (See Figure 5 and Figure 6) because the EXT input is less susceptible to noise. 73ND-0703-

2 MODE 0 (LS73) (LS73) (LS733) The functional differences of the modes of the are explained in Table and the output conduction angle diagrams in Figure 4. SHORT (TS Duration) TABLE TOUCH TYE LONG (TS Duration) RE-TOUCH OST-TOUCH RE-TOUCH OST-TOUCH Ø Ø Ø Ø Off Max Off Starts varying at Min re-touch brightness Off Memory Off Starts varying at (Note ) Memory (Note ) re-touch brightness Off Max Off Starts varying at Min re-touch brightness DIMMING DIRECTION REVERSAL (Note 3) NO NOTE : "Memory" refers to the conduction angle, Ø, which existed prior to the current off-state. First time after power-up, the Memory value defaults to maximum conduction angle. NOTE : First time after power-up, LONG touch causes intensity to vary starting at minimum conduction angle. NOTE 3: NO = Dimming direction does not reverse from prior dimming direction. = Dimming direction does reverse from prior dimming direction. = Does not apply VDD (in 7) Supply voltage negative terminal. (in 8) The output is a low level pulse occurring once every halfcycle of the input. The conduction angle, Ø, of the output in relation to the signal controls the lamp brightness. In continuous dimming operation (i.e. when the SENS input is continuously held low) the conduction angle, Ø, sweeps up and down between 4 and 58 continuously. The time vs Ø curve is not linear (See Figure 4). Between two maxima on this curve, there are 4 discontinuous points labeled A, B, B, A. The discontinuities are as follows:. From maximum to A. In this region, Ø is changed by equal increments ( ø) for every clocks.. From A to B. In this region, the increments ( ø) take place for every 4 clocks. 3. From B to B. In this region Ø is held at a constant level ( ø = 0). 4. From B to A. Same as. 5. From A to Max. Same as. The slower rate of change in ø over ABBA region is to accommodate for eye adjustment at lower light intensity. CA 4 3 HASE LOCK LOO Ø MEMORY MODE DIGITAL COMARATOR OUTUT DRIVER 8 EXT 6 CONTROL LOGIC Ø OINTER SENS 5 VSS (+V) FIGURE BLOCK DIAGRAM VDD 7 (-V) 73ND-0703-

3 ABSOLUTE MAXIMUM RATINGS: ARAMETER SYMBOL VALUE UNIT DC Supply Voltage VSS +0 V Any Input Voltage VIN Vss - 0 to Vss V Operating Temperature TA 0 to +80 C Storage Temperature TSTG -65 to +50 C DC ELECTRICAL CHARACTERISTICS: (TA = 5 C, all voltages referenced to VDD) ARAMETER SYMBOL MIN TY MAX UNIT CONDITION Supply Voltage Vss + +8 V - Supply Current Iss.0.4 ma Vss = +5V, output off Input Voltages: Lo VIRL 0 Vss V - Hi VIRH Vss Vss V - SENS Lo VIOL 0 Vss - 8 V - SENS Hi VIOH Vss - Vss V - EXT Lo VIVL 0 Vss - 8 V - EXT Hi VIVH Vss - Vss V - Input Current:, SENS, EXT Hi IIH 0 µa With Series.5MΩ Resistor to AC Line, SENS, EXT Lo IIL 00 na - Hi Voltage VOH Vss V - Lo Voltage VOL Vss - 8 V Vss = +5V Sink Current IOS 5 ma Vss = +5V VOL = Vss - 4V TIMING CHARACTERISTICS (See Figures and 3): All timings are based on fs = 60Hz, unless otherwise specified. 50Hz timings are. times 60Hz timings. ARAMETER SYMBOL MIN TY MAX UNIT Frequency fs Hz SHORT TOUCH TS ms (ON/OFF Operation) LONG TOUCH TS 34 - infinite ms (Dimming Operation) ulse Width TW µs Conduction-Angle Ø 4-58 deg (See Note ) Ø eriod (Max to Max in sec continuous dimming) AB = BA duration ms BB Min. intensity dwell ms NOTE. In the circuit schematic shown in Figure 5, the input signal is delayed in phase with respect to the AC Line by about 7. This delay reduces the conduction angle, Ø, with respect to the AC Line by 7 from the values shown above. ø TW TW FIGURE 3. OUTUT CONDUCTION ANGLE, Ø 73ND

4 ALICATION EXAMLE: A typical implementation of a lamp dimmer circuit is shown in Fig. 5. Here the brightness of the lamp is set by touching the Touch late. The functions of different components are as follows: The 5V DC supply for the chip is provided by Z, D, R, C and C5. R and C4 generate the filtered signal for the input for synchronizing the internal LL with the line frequency. R3 and C7 act as a filter circuit for the electronic extension. If extensions are not used, the EXT input (in 6) should be tied to VDD (in 7). R4, R5, R6 set up the sensitivity of the SENS input. C6 provides noise filtering. C3 is the filter capacitor for the internal LL. R8 provides current limiting and isolation between the chip output and the triac gate. C and L are RF filter circuits. In the case of momentary power failure, the circuit state remains unchanged for a period of up to sec. For longer power interruptions, the output is shut off. EXTN FIGURE 6. KΩ,/4W MS8599 ELECTRONIC EXTENSION IN94 00K Ω,/4W TOUCH LATE *R *R *R = M Ω,/4W for 5VAC *R = 3.6M Ω,/4W for 0VAC EXTENSIONS: All switching and dimming functions can be implemented by utilizing the EXT input. This can be done by either a pushbutton switch or the electronic switch in conjunction with a Touch late, shown in Figure 6. When the plate is touched, a logic high level is generated at the EXT input of the IC for both half- cycles of the line frequency. (See Figure 5) FIGURE 5. A Typical Lamp Dimmer SEE NOTE MT MT G T R8 + C5 Z - C7 R3 SEE NOTE 5 R7 EXTN ELECTRONIC EXTENSION (FIG. 6) 5VAC OR 0VAC C L D C VDD EXT SENS R6 R5 TOUCH LATE LOAD A B R R SEE NOTE 3 SEE NOTE 4 VSS MODE CA 3 4 C3 C4 C6 R4 N NOTES ) All circuits connected by broken lines are optional. ) C7 is used only with electronic extension and R7 is used only with mechanical switch. 3) See I/O Description for MODE (in ) 4) Use Connection A when Neutral is not available. Use Connection B when Neutral is available. 5) Connection between in 6 & in 7 should be broken when EXT is used. 5V C = 0.5µF, 00V R4 = MΩ to 5MΩ, /4W () C = 0.33µF, 00V (Select for sensitivity) C3 = 0.047µF, 5V R5, R6 =.7MΩ, /4W C4 = 470pF, 5V R7 = 50kΩ, /4W C5 = 47µF, 5V R8 = 00Ω, /4W C6 = 680pF, 5V D = IN448 C7 = 0.µF, 5V Z = 5V, W (Zener) () R = 70Ω, W T = Q4006L4 Triac (Typical) R =.5MΩ, /4W L = 00µH (RFI Filter) R3 =.5MΩ, /4W () For Connection A. Use 0.µF for Connection B. () For Connection A. Use /4W for Connection B. 0V C = 0.5µF, 400V R4 = MΩ to 5MΩ, /4W (3) C = 0.µF, 400V (Select for sensitivity) C3 = 0.047µF, 5V R5, R6 = 4.7MΩ, /4W C4 = 470pF, 5V R7 = 50kΩ, /4W C5 = 47µF, 5V R8 = 00Ω, /4W C6 = 680pF, 5V D = N448 C7 = 0.µF, 5V Z = 5V, W (Zener) (4) R = kω, W T = Q5004L4 Triac (Typical) R =.5MΩ, /4W L = 00µH (RFI Filter) R3 =.5MΩ, /4W (3) For Connection A. Use 0.µF for Connection B. (4) For Connection A. Use /4W for Connection B. 73ND

5 FIGURE 7. A SWITCH-OERATED LAM DIMMER AC ON-OFF SWITCH G R3 MT MT T + C5 Z - USHBUTTON SWITCH C D 5VAC OR (SEE NOTE ) 0VAC L C V DD EXT SENS R R OUT TO LAM VSS MODE CA 3 4 C3 C4 (SEE NOTE ) R4 NOTE : Operation is independent of Line lug olarity NOTE : See I/O Description for MODE (in ) 5V 0V C = 0.5µF, 00V C = 0.5µF, 400V C = 0.µF, 00V C = 0.µF, 400V C3 = 0.047µF, 5V C3 = 0.047µF, 5V C4 = 470pF, 5V C4 = 470pF, 5V C5 = 47µF, 5V C5 = 47µF, 5V R = 70Ω, /4W R = kω, /4W R =.5MΩ, /4W R =.5MΩ, /4W R3 = 00Ω, /4W R3 = 00Ω, /4W R4 = MΩ, /4W R4 = MΩ, /4W D = IN448 D = IN448 Z = 5V, W (Zener) Z = 5V, W (Zener) T = Q4008L4 (Typical) T = Q5004L4 (Typical) L = 00µH (RFI Filter) L = 00µH (RFI Filter) ALICATIONS:. Foot-Switch Dimmer for large floor lamps.. Hand-Switch Dimmer for end-table lamps. The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. 73ND