FIGURE 2. OUTPUT DELAY (Td)
SYNC (Pin 2)
TRIG(Pin 8)
Td
Td
INPUT/OUTPUT DESCRIPTION:
CONTROL I/O (Pin 5)
CLOCK Input (Pin 1)
An external R-C network connected between this pin
and VDD establishes the controlling feedback for the
AGC Loop.
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)
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.
SYNC Input (Pin 2)
VSS (Pin 7)
50 or 60Hz AC input for zero crossing detection.
Supply voltage negative terminal.
VDD (Pin 3)
TRIG (Pin 8)
Supply voltage positive terminal.
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)
TOUCH Input (Pin 4)
Input for sensing that a touch has been made on a lamp
surface or other touch plate.
ABSOLUTE MAXIMUM RATINGS:
PARAMETER
SYMBOL
VALUE
UNIT
DC supply voltage
Any input voltage
Operating temperature
Storage temperature
VDD - VSS
VIN
TA
TSTG
+11
VSS - 0.5 to VDD + 0.5
-20 to +85
V
V
°C
°C
-65 to +150
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
LSI [ LSI COMPUTER SYSTEMS ]
