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LS7233 Datasheet(PDF) 2 Page - LSI Computer Systems |
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LS7233 Datasheet(HTML) 2 Page - LSI Computer Systems |
2 / 8 page TABLE 1 TOUCH TYPE SHORT (TS1 Duration) LONG (TS2 Duration) PRE-TOUCH POST-TOUCH PRE-TOUCH POST-TOUCH Ø Ø Ø Ø Off Max Off Starts varying at Min Max Off Max Starts varying at Max Intermediate Off Intermediate Starts varying at Pre-Touch brightness Off Memory Off Starts varying at (Note 1) Memory (Note 2) Max Off Max Starts varying at Max Intermediate Off Intermediate Starts varying at Pre-Touch brightness Off Max Off Starts varying at Min Max Off Max Starts varying at Max Intermediate Off Intermediate Starts varying at Pre-Touch brightness Off Memory Off Starts varying at (Note 1) Memory (Note 2) Max Off Max Starts varying at Max Intermediate Off Intermediate Starts varying at Pre-Touch brightness 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 con- trols the turn-on, turn-off and conduction angle Ø (See- Figure 3) of the TRIG signal with respect to the SYNC in- put. EXT (Pin 6) The EXT input is functionally identical to the SENS input except that a high level activates this input. It is rec- ommended that the EXT input be used instead of the SENS input when long extension wires are employed be- tween the IC and the Sensing Circuitry (See Figure 5 and Figure 6) because the EXT input is less susceptible to “Noise”. VDD (Pin 4) Supply voltage negative terminal. TRIG (Pin 8) The TRIG output is a low level pulse occurring once every half-cycle of the SYNC input. The conduction angle, Ø, of the output in relation to the SYNC signal controls the lamp bright- ness. In continuous dimming operation (i.e. when the SENS input is continuously held low) the TRIG conduction angle, Ø, sweeps up and down between 41˚ and 158˚ continuously. The time vs Ø curve is not linear (See Figure 2). Between two maxima on this curve, there are 4 discontinuous points labeled A1, B1, B2, A2. The discontinuities are as follows: 1. From maximum to A1. In this region, Ø is changed by equal increments ( ∆ø) for every 2 SYNC clocks. 2. From A1 to B1. In this region, the increments ( ∆ø) take place for every 4 SYNC clocks. 3. From B1 to B2. In this region Ø is held at a constant level ( ∆ø = 0). 4. From B2 to A2. Same as 2. 5. From A2 to Max. Same as 1. The slower rate of change in ø over A1B1B2A2 region is to accommodate for eye adjustment at lower light intensity. The functional differences of different versions of the light dimmer ICs are explained in Table 1 and the TRIG output conduction angle diagrams in Figure 2. PART NUMBER LS7231 LS7232 LS7233 LS7234 DIMMING DIRECTION REVERSAL (Note 3) N/A N/A NO YES N/A YES N/A N/A YES NO N/A NO NOTE 1: "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 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 7231-34-033195-2 |
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