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LS7534 Datasheet(PDF) 2 Page - LSI Computer Systems |
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LS7534 Datasheet(HTML) 2 Page - LSI Computer Systems |
2 / 8 page UP/DOWN SIGNAL DURATION SHORT LONG INPUT 34ms to 325 ms More than 334ms UP DOWN PRE-ACTIVATION BRIGHTNESS Off Max. Intermediate Off Max. Intermediate POST-ACTIVATION BRIGHTNESS Memory ** (See Note 1) No Change No Change No Change Off * Off * PRE-ACTIVATION BRIGHTNESS Off Max. Intermediate Off Max. Intermediate POST-ACTIVATION BRIGHTNESS Increases from Min. No change Increases from pre- touch brightness No change Decreases from Max. Decreases from pre- touch brightness * 5.6 second ramp-down from max. to off. Ramp-down time from any other brightness is proportionally shorter. ** 2.8 second ramp-up from off to max. NOTE 1: "Memory" refers to the brightness stored in the memory. The brightness is stored in memory when the lamp is turned off by a short activation. First time after power-up, a short activation produces max. brightness. INPUT/OUTPUT DESCRIPTION: VSS (Pin 1) Supply voltage positive terminal. DOZE (Pin 2) A clock applied to this input causes the brightness to de- crease in equal increments with each negative transition of the clock. Eventually, when the lamp becomes off, this input has no further effect. The lamp can be turned on again by activating the UP input. For the transition from maximum brightness to off, a total of 83 clock pulses are needed at the DOZE input. When either the UP or the DOWN input is active, the DOZE input is disabled. CAP (Pin 3) The CAP input is for external component connection for the PLL filter capacitor. A capacitor of 0.047µF ± 20% should be used at this input. SYNC (Pin 4). The AC line frequency (50Hz/60Hz), when applied to this input, synchronizes all internal timings through a phase lock loop. The signal for this input may be obtained from the line voltage by employing the circuit arrangement shown in the application examples. UP (Pin 5). This input controls the turn-on and the conduction angle, ø , of the TRIG output. A description of this is provided in the DESCRIPTION and TABLE 1. For LS7534, a logic low level is the active level whereas for LS7535 a logic high level is the active level. LS7535 has an internal pull-down resistor of about 500K Ohms on this input. DOWN (Pin 6). This input controls the turn-off and the conduction angle, ø, of the TRIG output. A description of this is provided in the DESCRIPTION and TABLE 1. For LS7534, a logic low level is the active level, whereas for LS7535 a logic high level is the active level. LS7535 has an internal pull-down resistor of about 500K Ohms on this input. VDD (Pin 7). Supply voltage negative terminal. TRIG (Pin 8). The TRIG output provides a low level pulse occurring every half-cycle of the SYNC signal. The conduction angle, ø, of the TRIG output can be varied within the range of 41o to 159o by means of either the UP or the DOWN input. TABLE 1 7534/35-080796-2 |
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