LS7232 LSI Computer Systems, Inc., LS7232 Datasheet

LS7232

Manufacturer Part Number

LS7232

Description

DIP-8

Manufacturer

LSI Computer Systems, Inc.

Datasheets

1.LS7231.pdf (8 pages)

2.LS7232.pdf (5 pages)

Specifications of LS7232

Date_code

04+

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Download datasheet (217Kb)

7231-011708-1

DESCRIPTION:

LS7231 through LS7234 are MOS integrated circuits de-

signed for the control of brightness of incandescent

lamps. The outputs of these ICs control the brightness of

a lamp by controlling the firing angle of a triac connected

in series with the lamp. All internal timings are syn-

chronized with the line frequency by means of a built-in

phase-lock loop circuit. The output occurs once every

half-cycle of the line frequency. Within the half-cycle, the

output

158˚conduction angle for maximum brightness and 41˚

conduction angle for minimum brightness in relation to the

AC line frequency. The positioning of the output is con-

trolled by applying a low level at the SENS input or a high

level at the EXT input.

These functions may be implemented with very few inter-

face components, as shown in Figure 5. When imple-

mented in this manner, touching of the Touch Plate caus-

es the lamp brightness to change as follows:

2. If the Touch Plate is touched for a prolonged time

FEATURES:

• Phase-lock loop synchronization allows

• Provides brightness control of incandescent lamps

• Controls the "duty cycle" from 23% to 88%

• Operates at 50Hz/60Hz line frequency.

• Extension input for remote activation.

• Input for slow dimming.

• +12V to +18V operation (V

• LS7231 to LS7234 (DIP);

U L

A3800

use in Wall Switch applications.

with touch plates or pushbutton switches.

(conduction angles for AC half-cycles between 41˚ and

158˚, respectively.)

LS7231-S to LS7234-S (SOIC) - See Figure 1

If the Touch Plate is touched momentarily (42ms to

333ms), the lamp is:

a) turned off if it was on,

b) turned on if it was off.

The brightness resulting is either full brightness or

depending on the circuit type, a previous brightness

stored in the IC memory.

(more than 342ms) the light intensity changes slowly.

As long as the touch is maintained, the change con-

tinues; the direction of change reverses whenever the

maximum or minimum brightness is reached.

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

can

positioned

TOUCH CONTROL LAMP DIMMER

- V

anywhere

between

The IC also provides an input for slow dimming. By ap-

plying a slow clock to this input, the lamp can be dimmed

slowly until total turn off occurs. This fea- ture can be

useful at bedtime in a child’s room.

INPUT/OUTPUT DESCRIPTION:

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 turns off, this in-

put has no further effect. The lamp can be turned on

again by activating either the SENS input or the EXT in-

put. For the transition from maximum brightness to off, a

total of 83 clock pulses are needed at the DOZE input.

When either the SENS or the EXT input is active, the

DOZE input is disabled. (See Figure 7)

CAP (Pin 3)

The CAP input is for the PLL filter capacitor. A 0.047µF

capacitor should be connected to this input.

(Pin 1)

DOZE

SYNC

CAP

(+V )

PIN ASSIGNMENT - TOP VIEW

LS7231-7234

(631) 271-0400 FAX (631) 271-0405

FIGURE 1

SENS

TRIG

EXT

(-V )

January 2008

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