LS7231 Просмотр технического описания (PDF) - LSI Corporation

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LS7231

TOUCH CONTROL LAMP DIMMER

LSI Corporation  

EXTN

P

2KΩ ,1/4W

MPS8599

TOUCH PLATE

*R

IN914

*R

*R = 2M Ω ,1/4W for 115VAC

*R = 3.6M Ω ,1/4W for 220VAC

200K Ω ,1/4W

FIGURE 6. ELECTRONIC EXTENSION

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)

VSS

SENS

DZ

VDD

3.3M ,1/4W

U1-1

DOZE

SWITCH

U1-2

3.3M ,1/4W

DZ

U1-3

+

10µF

-

U1 = CD4093

FIGURE 7. DOZE CIRCUIT

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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