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LS7534 Datasheet(PDF) 8 Page - LSI Computer Systems |
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LS7534 Datasheet(HTML) 8 Page - LSI Computer Systems |
8 / 8 page V SS UP DN DZ V DD FIGURE 6A. DOZE CIRCUIT FOR LS7534 Sense DOZE SWITCH 4093 4093 4093 10µF 330K 4093 MP58098 + - 3.3M 330K 3.3M NOTE: All Resistors 1/4W, all Capacitors 25V V SS VDD DOZE SWITCH 4093 4093 FIGURE 6B. DOZE CIRCUIT FOR LS7535 4093 4093 + - DZ Sense 3.3M UP DN IN914 IN914 3.3M 3.3M 10µF NOTE: All Resistors 1/4 W, all Capacitors 25V. DOZE CIRCUIT: (Figures 6A and 6B) The Doze circuits shown generate a slow clock (0.04Hz) at the DZ terminal. If the UP/DOWN inputs (Figures 5A and 5B) are not activated, the Sense node of the Doze circuit sits at a logic high level. A momentary pressing of the Doze switch sets the SR flip-flop, enabling the oscillator. Every negative transition of the clock (DZ terminal) causes the lamp brightness to be reduced by equal increments, un- til eventurally the lamp is shut- off. When the lamp is off, the oscillator has no further effect on the dimmer circuit. When the lamp is turned on again by activating the UP input, the SR flip-flop is reset and the DZ clock is turned off. When the Doze circuit is used, the connection between DOZE input (Pin 2) and Vss (Pin 1), as shown in Figures 5A and 5B, should be removed. FIGURE 7. OPERATING DESCRIPTION OF A FULL-FEATURE LS7535 WALL SWITCH See Application Note AN 705 for the Schematic DUAL CONTROL CONTINUOUS DIMMER WITH UNIQUE DELAYED OFF FEATURE INITIAL CONDITION ACTION RESULT Off SHORT PRESS On “Softly” turns On to memory intensity (1) Off LONG PRESS On Varies from min. intensity towards max. intensity (2) On LONG PRESS On Varies towards max. intensity (2) On LONG PRESS Off Varies towards min. intensity (3) On SHORT PRESS Off “Softly” turns Off On PRESS Auto-Dim Begins auto-dimming to off (4) Auto-Dimming SHORT PRESS On “Softly” returns to memory intensity (5) Auto-Dimming LONG PRESS On Varies towards max. intensity (2) Auto-Dimming SHORT PRESS Off “Softly “ turns off Auto-Dimming LONG PRESS Off Varies towards min. intensity (3) Auto-Dimming PRESS Auto-Dim No change Auto-Dimming None Auto-dims to Off (1) Last intensity achieved before turn off is stored as memory intensity. (2) On (Dim Up) varies intensity towards maximum and stops there. (3) Off (Dim Down) varies intensity towards minimum and stops there. (4) Auto-dimming period controlled by RC components and intensity level when Auto-Dim is activated. (5) Last intensity achieved before Auto-Dim started is stored as memory intensity. 7535-012703-8 ON DIM UP OFF DIM DOWN AUTO DIM |
Similar Part No. - LS7534_03 |
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Similar Description - LS7534_03 |
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