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LS7538

TOUCH CONTROL STEP DIMMER LIGHT SWITCH WITH AUTOMATIC GAIN CONTROL (AGC)

LSI Corporation  

FIGURE 2. OUTPUT DELAY (Td)

SYNC (Pin 2)

TRIG(Pin 8)

Td

Td

INPUT/OUTPUT DESCRIPTION:

CLOCK Input (Pin 1)

An external resistor connected between this input and

VDD, along with an internal capacitor and oscillator stage,

generates a clock which is used for all timing functions.

The recommended value of this resistor for 50Hz and

60Hz operation is specified in the ELECTRICAL CHAR-

ACTERISTICS. The resistor value determines the Bright-

ness Levels produced. (See Table 2)

SYNC Input (Pin 2)

50 or 60Hz AC input for zero crossing detection.

VDD (Pin 3)

Supply voltage positive terminal.

TOUCH Input (Pin 4)

Input for sensing that a touch has been made on a lamp

surface or other touch plate.

CONTROL I/O (Pin 5)

An external R-C network connected between this pin

and VDD establishes the controlling feedback for the

AGC Loop.

MODE Input (Pin 6)

A three-state input used to select the desired Bright-

ness Step Sequence (See Table 1). The MODE Input

may be changed during operation.

VSS (Pin 7)

Supply voltage negative terminal.

TRIG (Pin 8)

The TRIG output produces a negative going pulse eve-

ry half-cycle of the SYNC input to trigger the triac. The

delay, Td, of the pulse with respect to the SYNC signal

determines the Brightness Level produced.

(See Table 2 & Figure 2)

ABSOLUTE MAXIMUM RATINGS:

PARAMETER

DC supply voltage

Any input voltage

Operating temperature

Storage temperature

SYMBOL

VDD - VSS

VIN

TA

TSTG

VALUE

+11

VSS - 0.5 to VDD + 0.5

-20 to +85

-65 to +150

UNIT

V

V

°C

°C

7538/39-041597-2

The information included herein is believed to be

accurate and reliable. However, LSI Computer Systems,

Inc. assumes no responsibilities for inaccuracies, nor for

any infringements of patent rights of others which may

result from its use.

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