LSI/CSI UL (R) LS7232ND LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 A3800 January 2003 TOUCH CONTROL LAMP DIMMER These functions may be implemented with very few interface components, as shown in Figure 5. When implemented in this manner, touching of the Touch Plate causes the lamp brightness to change as follows: 1. 2. If the Touch Plate is touched momentarily (42ms 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 Plate is touched for a prolonged time (more than 342ms) 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. INPUT/OUTPUT DESCRIPTION: VSS (Pin 1) Supply voltage positive terminal. MODE (Pin 2) The LS7232ND can operate in either of 3 modes, Mode 0, Mode 1 or Mode 2. A full description of the operating modes is provided in Table 1. The MODE input level selects the operating mode as follows: 7232ND-012703-1 1 8 TRIG MODE 2 7 V DD (-V) CAP 3 6 EXT SYNC 4 5 SENS V SS (+V) LS7232ND DESCRIPTION: LS7232ND 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 158conduction angle for maximum brightness and 41 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. PIN ASSIGNMENT - TOP VIEW LSI FEATURES: * Phase-lock loop synchronization allows use in Wall Switch applications. * Provides brightness control of incandescent lamps with touch plates or pushbutton switches. * Controls the duty cycle from 23% to 88% (conduction angles for AC half-cycles between 41 and 158, respectively.) * Operates at 50Hz/60Hz line frequency. * Extension input for remote activation. * +12V to +18V Power Supply voltage (VSS - VDD). * LS7232ND (DIP); LS7232ND-S (SOIC ) - See Figure 1 FIGURE 1 MODE Input VDD Vss Float Mode 0 1 2 Functional Equivalent* LS7231 LS7232 LS7233 *NOTE: The LS7232ND can replace LS7231, LS7232 and LS7233 where the DOZE input is not used. The LS7232 PCB requires no change. The LS7233 PCB requires that the Pin 2 connection be opened. The LS7231 PCB requires that the Pin 2 connection be made to VDD instead of Vss. CAP (Pin 3) The CAP input is for the PLL filter capacitor. A 0.047F capacitor should be connected to this input. SYNC (Pin 4) The AC Line Frequency is applied to this input through an external RC circuit (See Figure 5). The Phase-Lock Loop in the IC synchronizes all internal timings to the AC signal at the SYNC input. SENS (Pin 5) A low level activates this input (See Table 1) which controls the turn-on, turn-off and conduction angle, O (See Figure 3), of the TRIG signal with respect to the SYNC input. EXT (Pin 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. The functional differences of the modes of the LS7232ND are explained in Table 1 and the TRIG output conduction angle diagrams in Figure 4. TABLE 1 TOUCH TYPE MODE SHORT (TS1 Duration) (LS7231) PRE-TOUCH O Off Max Intermediate 1 Off 0 (LS7232) Max Intermediate 2 Off Max Intermediate (LS7233) DIMMING DIRECTION REVERSAL (Note 3) LONG (TS2 Duration) POST-TOUCH O Max Off Off Memory (Note 1) Off Off PRE-TOUCH O Off Max Intermediate Off Max Intermediate Max Off Off Off Max Intermediate POST-TOUCH O Starts varying at Min Starts varying at Max Starts varying at Pre-Touch brightness N/A N/A NO Starts varying at Memory (Note 2) Starts varying at Max Starts varying at Pre-Touch brightness YES Starts varying at Min Starts varying at Max Starts varying at Pre-Touch brightness N/A N/A YES N/A YES NOTE 1: "Memory" refers to the conduction angle, O, which existed prior to the current off-state. First time after power-up, the Memory value defaults to maximum conduction angle. NOTE 2: 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. YES = Dimming direction does reverse from prior dimming direction. N/A = Does not apply VDD (Pin 7) Supply voltage negative terminal. The discontinuities are as follows: TRIG (Pin 8) The TRIG output is a low level pulse occurring once every halfcycle of the SYNC input. The conduction angle, O, of the output in relation to the SYNC signal controls the lamp brightness. In continuous dimming operation (i.e. when the SENS input is continuously held low) the TRIG conduction angle, O, sweeps up and down between 41 and 158 continuously. The time vs O curve is not linear (See Figure 4). Between two maxima on this curve, there are 4 discontinuous points labeled A1, B1, B2, A2. SYNC 4 CAP 3 MODE 2 BUF PHASE LOCK LOOP The slower rate of change in o over A1B1B2A2 region is to accommodate for eye adjustment at lower light intensity. O MEMORY DIGITAL COMPARATOR CONTROL LOGIC EXT 6 BUF SENS 5 BUF V SS 1 (+V) V DD 7 (-V) 7232ND-012703-2 1. From maximum to A1. In this region, O is changed by equal increments (o) for every 2 SYNC clocks. 2. From A1 to B1. In this region, the increments (o) take place for every 4 SYNC clocks. 3. From B1 to B2. In this region O is held at a constant level (o = 0). 4. From B2 to A2. Same as 2. 5. From A2 to Max. Same as 1. O POINTER FIGURE 2 LS7232ND BLOCK DIAGRAM OUTPUT DRIVER 8 TRIG ABSOLUTE MAXIMUM RATINGS: PARAMETER SYMBOL DC Supply Voltage VSS Any Input Voltage VIN Operating Temperature TA Storage Temperature TSTG DC ELECTRICAL CHARACTERISTICS: VALUE +20 Vss - 20 to Vss + 0.5 0 to +80 -65 to +150 UNIT V V C C (TA = 25C, all voltages referenced to VDD) PARAMETER Supply Voltage Supply Current SYMBOL Vss Iss MIN +12 - TYP - 1.0 Input Voltages: SYNC Lo SYNC Hi SENS Lo SENS Hi EXT Lo EXT Hi VIRL VIRH VIOL VIOH VIVL VIVH 0 Vss - 5.5 0 Vss - 2 0 Vss - 2 - - - - - - MAX +18 1.4 Vss - 9.5 Vss Vss - 8 Vss Vss - 8 Vss UNIT V mA CONDITION Vss = +15V, output off V V V V V V - Input Current: SYNC, SENS, EXT Hi IIH - - 110 A SYNC, SENS, EXT Lo IIL - - 100 nA TRIG Hi Voltage TRIG Lo Voltage TRIG Sink Current VOH VOL IOS - - 25 Vss Vss - 8 - - - - V V mA With Series 1.5M Resistor to AC Line Vss = +15V Vss = +15V VOL = Vss - 4V TIMING CHARACTERISTICS (See Figures 2 and 3): All timings are based on fs = 60Hz, unless otherwise specified. 50Hz timings are 1.2 times 60Hz timings. PARAMETER SYMBOL MIN TYP MAX UNIT SYNC Frequency fs 40 70 Hz SHORT TOUCH TS1 42 333 ms (ON/OFF Operation) LONG TOUCH TS2 342 infinite ms (Dimming Operation) TRIG Pulse Width TW 33 s TRIG Conduction-Angle O 41 158 deg (See Note 1) O Period (Max to Max in 7.64 sec continuous dimming) A1B1 = B2A2 duration 934 ms B1B2 Min. intensity dwell 500 ms NOTE 1. In the circuit schematic shown in Figure 5, the SYNC input signal is delayed in phase with respect to the AC Line by about 7. This delay reduces the conduction angle, O, with respect to the AC Line by 7 from the values shown above. SYNC o TRIG TW TW FIGURE 3. TRIG OUTPUT CONDUCTION ANGLE, O 7232ND-012703-3 APPLICATION EXAMPLE: 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 Plate. The functions of different components are as follows: TOUCH PLATE FIGURE 6. ELECTRONIC EXTENSION *R 2K ,1/4W * The 15V DC supply for the chip is provided by Z, D1, R1, C2 and C5. R2 and C4 generate the filtered signal for the SYNC input for synchronizing the internal PLL with the line frequency. R3 and C7 act as a filter circuit for the electronic extension. If extensions are not used, the EXT input (Pin 6) should be tied to VDD (Pin 7). R4, R5, R6 set up the sensitivity of the SENS input. C6 provides noise filtering. C3 is the filter capacitor for the internal PLL. R8 provides current limiting and isolation between the chip output and the triac gate. C1 and L are RF filter circuits. * * * * * * IN914 EXTN *R MPS8599 200K ,1/4W *R = 2M ,1/4W for 115VAC *R = 3.6M ,1/4W for 220VAC P 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 Plate, 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) In the case of momentary power failure, the circuit state remains unchanged for a period of up to 1 sec. For longer power interruptions, the output is shut off. FIGURE 5. A Typical Lamp Dimmer P P SEE NOTE 2 C7 R8 G EXTN R7 MT1 T MT2 + Z - R3 C5 ELECTRONIC EXTENSION (FIG. 6) SEE NOTE 5 D1 L 115VAC OR 220VAC R6 C1 8 C2 7 6 TRIG V DD 5 R5 TOUCH PLATE EXT S E N S LS7232ND R1 R2 V SS MODE CAP SYNC 1 2 3 4 A SEE NOTE 3 B LOAD C4 C6 R4 SEE NOTE 4 NOTES N C3 1) All circuits connected by broken lines are optional. 2) C7 is used only with electronic extension and R7 is used only with mechanical switch. 3) See I/O Description for MODE (Pin 2) 4) Use Connection A when Neutral is not available. Use Connection B when Neutral is available. 5) Connection between Pin 6 & Pin 7 should be broken when EXT is used. 115V C1 = 0.15F, 200V (1) C2 = 0.33F, 200V C3 = 0.047F, 25V C4 = 470pF, 25V C5 = 47F, 25V C6 = 680pF, 25V C7 = 0.1F, 25V (2) R1 = 270, 1W R2 = 1.5M, 1/4W R3 = 1.5M, 1/4W 220V R4 = 1M to 5M, 1/4W (Select for sensitivity) R5, R6 = 2.7M, 1/4W R7 = 150k, 1/4W R8 = 100, 1/4W D1 = IN4148 Z = 15V, 1W (Zener) T = Q4006L4 Triac (Typical) L = 100H (RFI Filter) (1) For Connection A. Use 0.22F for Connection B. (2) For Connection A. Use 1/4W for Connection B. 7232ND-012703-4 C1 = 0.15F, 400V (3) C2 = 0.22F, 400V C3 = 0.047F, 25V C4 = 470pF, 25V C5 = 47F, 25V C6 = 680pF, 25V C7 = 0.1F, 25V (4) R1 = 1k, 2W R2 = 1.5M, 1/4W R3 = 1.5M, 1/4W R4 = 1M to 5M, 1/4W (Select for sensitivity) R5, R6 = 4.7M, 1/4W R7 = 150k, 1/4W R8 = 100, 1/4W D1 = 1N4148 Z = 15V, 1W (Zener) T = Q5004L4 Triac (Typical) L = 200H (RFI Filter) (3) For Connection A. Use 0.1F for Connection B. (4) For Connection A. Use 1/4W for Connection B. FIGURE 7. A SWITCH-OPERATED LAMP DIMMER AC ON-OFF SWITCH R3 G MT1 + T1 MT2 Z1 C5 PUSHBUTTON SWITCH - D1 C1 L 115VAC OR (SEE NOTE 1 ) 220VAC C2 8 7 6 5 TRIG V DD EXT S E N S LS7232ND R1 R2 V SS MODE CAP SYNC 1 2 3 4 C3 (SEE NOTE 2) C4 R4 OUT TO LAMP NOTE 1: Operation is independent of Line Plug Polarity NOTE 2: See I/O Description for MODE (Pin 2) 115V C1 = 0.15F, 200V C2 = 0.22F, 200V C3 = 0.047F, 25V C4 = 470pF, 25V C5 = 47F, 25V R1 = 270, 1/4W R2 = 1.5M, 1/4W R3 = 100, 1/4W R4 = 1M, 1/4W D1 = IN4148 Z1 = 15V, 1W (Zener) T1 = Q4008L4 (Typical) L = 100H (RFI Filter) APPLICATIONS: 1. Foot-Switch Dimmer for large floor lamps. 2. Hand-Switch Dimmer for end-table lamps. 7232ND-012703-5 220V C1 = 0.15F, 400V C2 = 0.1F, 400V C3 = 0.047F, 25V C4 = 470pF, 25V C5 = 47F, 25V R1 = 1k, 1/4W R2 = 1.5M, 1/4W R3 = 100, 1/4W R4 = 1M, 1/4W D1 = IN4148 Z1 = 15V, 1W (Zener) T1 = Q5004L4 (Typical) L = 200H (RFI Filter) 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.