LS7232ND LSI Computer Systems, Inc., LS7232ND Datasheet

LS7232ND

Manufacturer Part Number

LS7232ND

Description

TOUCH CONTROL LAMP DIMMER

Manufacturer

LSI Computer Systems, Inc.

Datasheet

1.LS7232ND.pdf (5 pages)

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7232ND-012703-1

DESCRIPTION:

LS7232ND is a MOS integrated circuit designed to control

brightness of incandescent lamps. The output of this IC controls

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 can be posi-

tioned anywhere between 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

controlled 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 interface

components, as shown in Figure 5. When implemented in this

manner, touching of the Touch Plate causes the lamp brightness

to change as follows:

INPUT/OUTPUT DESCRIPTION:

Supply voltage positive terminal.

MODE (Pin 2)

The LS7232ND can operate in either of 3 modes, Mode 0,

Mode 1 or Mode 2. A full description of the operating modes is

provided in Table 1. The MODE input level selects the operating

mode as follows:

FEATURES:

• Phase-lock loop synchronization

• 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.

• +12V to +18V Power Supply voltage (V

• LS7232ND (DIP); LS7232ND-S (SOIC ) - See Figure 1

LSI/CSI

allows use in Wall Switch applications.

with touch plates or pushbutton switches.

(conduction angles for AC half-cycles

U L

A3800

between 41˚ and 158˚, respectively.)

(Pin 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 mode, a previous brightness stored in the

IC memory.

If the Touch Plate is touched

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

long as the touch is maintained, the change continues; the

direction of change reverses whenever the maximum or

minimum brightness is reached.

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

TOUCH CONTROL LAMP DIMMER

for a prolonged time

- V

MODE Input

*NOTE:

LS7233 where the DOZE input is not used. The LS7232 PCB

requires no change. The LS7233 PCB requires that the Pin 2

connection be opened. The LS7231 PCB requires that the Pin

2 connection be made to V

CAP (Pin 3)

The CAP input is for the PLL filter capacitor.

A 0.047µF capacitor should be connected to this input.

SYNC (Pin 4)

The AC Line Frequency is applied to this input through an ex-

ternal 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 controls the

turn-on, turn-off and conduction angle, Ø (See Figure 3), of the

TRIG signal with respect to the SYNC input.

EXT (Pin 6)

The EXT input is functionally identical to the SENS input except

that a high level activates this input. It is recommended that the

EXT input be used instead of the SENS input when long exten-

sion wires are employed between the IC and the Sensing Cir-

cuitry (See Figure 5 and Figure 6) because the EXT input is

less susceptible to noise.

Vss

Float

The LS7232ND can replace LS7231, LS7232 and

MODE

SYNC

CAP

(+V)

LS7232ND

PIN ASSIGNMENT - TOP VIEW

Mode

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

FIGURE 1

instead of Vss.

Functional Equivalent*

LS7231

LS7232

LS7233

TRIG

EXT

S E N S

(-V)

January 2003

Related parts for LS7232ND

LS7232ND Summary of contents

Page 1

... INPUT/OUTPUT DESCRIPTION: V (Pin 1) SS Supply voltage positive terminal. MODE (Pin 2) The LS7232ND can operate in either of 3 modes, Mode 0, Mode 1 or Mode 2. A full description of the operating modes is provided in Table 1. The MODE input level selects the operating mode as follows: 7232ND-012703 ...

Page 2

... The functional differences of the modes of the LS7232ND are explained in Table 1 and the TRIG output conduction angle diagrams in Figure 4. MODE SHORT (T PRE-TOUCH Ø Off 0 Max Intermediate (LS7231) Off 1 Max (LS7232) Intermediate Off 2 Max Intermediate (LS7233) NOTE 1: "Memory" refers to the conduction angle, Ø, which existed prior to the current off-state. ...

Page 3

ABSOLUTE MAXIMUM RATINGS: PARAMETER SYMBOL DC Supply Voltage Any Input Voltage Operating Temperature Storage Temperature DC ELECTRICAL CHARACTERISTICS: PARAMETER Supply Voltage Supply Current Input Voltages: SYNC Lo SYNC Hi SENS Lo SENS Hi EXT Lo EXT Hi Input Current: SYNC, ...

Page 4

APPLICATION EXAMPLE: A typical implementation of a lamp dimmer circuit is shown in Fig. 5. Here the brightness of the lamp is set by touching the Touch Plate. The functions of different components are as follows: • The 15V DC ...

Page 5

FIGURE 7. A SWITCH-OPERATED LAMP DIMMER AC ON-OFF SWITCH (SEE NOTE NOTE 1: Operation is independent of Line Plug Polarity NOTE 2: See I/O ...

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