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LS7538 Datasheet(PDF) 2 Page - LSI Computer Systems

Part No. LS7538
Description  TOUCH CONTROL STEP DIMMER LIGHT SWITCH WITH AUTOMATIC GAIN CONTROL (AGC)
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Maker  LSI [LSI Computer Systems]
Homepage  http://www.lsicsi.com
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LS7538 Datasheet(HTML) 2 Page - LSI Computer Systems

   
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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)
SYNC (Pin 2)
FIGURE 2. OUTPUT DELAY (Td)
Td
Td
TRIG(Pin 8)
ABSOLUTE MAXIMUM RATINGS:
PARAMETER
SYMBOL
VALUE
UNIT
DC supply voltage
VDD - VSS
+11
V
Any input voltage
VIN
VSS - 0.5 to VDD + 0.5
V
Operating temperature
TA
-20 to +85
°C
Storage temperature
TSTG
-65 to +150
°C
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.
7538/39-041597-2


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