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LS7232 Datasheet(PDF) 7 Page - LSI Computer Systems |
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LS7232 Datasheet(HTML) 7 Page - LSI Computer Systems |
7 / 8 page EXTN 2K Ω ,1/4W IN914 TOUCH PLATE *R 200K Ω ,1/4W MPS8599 FIGURE 6. ELECTRONIC EXTENSION *R P *R = 2M Ω ,1/4W for 115VAC *R = 3.6M Ω ,1/4W for 220VAC VSS VDD DOZE SWITCH FIGURE 7. DOZE CIRCUIT 3.3M ,1/4W + - 3.3M ,1/4W 10µF SENS DZ U1-1 U1-2 U1-3 DZ U1 = CD4093 EXTENSIONS: All switching and dimming functions can also be implemented by utilizing the EXT input. This can be done by either a mechanical switch or the electronic switch in conjunction with a Touch Plate as 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) DOZE CIRCUIT: The DOZE circuit shown in Figure 7 generates a slow clock (0.04Hz) at the DZ terminal. If the Touch Plate (Figure 5) is not touched, the SENS terminal of the DOZE circuit of Figure 7 sits at a logic high level. A mo- mentary pressing of the DOZE switch sets the SR flip-flop, enabling the oscillator. Every negative transition of the clock (DZ terminal) causes the light intensity to be reduced by equal increments, until eventually the light is shut off. The oscillator has no further effect on the dimmer circuit. When the light is turned on again by touching theTouch Plate, 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 Figure 5, should be removed. . 7231-4-041195-7 |
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