V
SS
3.3M
3.3M
V
SS
330K
Sense
UP
DN
3.3M
4093
4093
+
3.3M
IN914
4093
4093
IN914
UP
DN
4093
DZ
330K
4093
MP58098
4093
-
10µF
Sense
4093
+
-
10µF
DOZE
SWITCH
DZ
V
DD
NOTE: All Resistors 1/4W, all Capacitors 25V
3.3M
DOZE
SWITCH
V
DD
NOTE: All Resistors 1/4 W, all Capacitors 25V.
FIGURE 6A.
DOZE CIRCUIT FOR LS7534
FIGURE 6B.
DOZE CIRCUIT FOR LS7535
DOZE CIRCUIT: (Figures 6A and 6B)
The Doze circuits shown generate a slow clock (0.04Hz) at
the DZ terminal. If the UP/DOWN inputs (Figures 5A and
5B) are not activated, the Sense node of the Doze circuit
sits at a logic high level. A momentary pressing of the
Doze switch sets the SR flip-flop, enabling the oscillator.
Every negative transition of the clock (DZ terminal) causes
the lamp brightness to be reduced by equal increments, un-
til eventurally the lamp is shut- off.
When the lamp is off, the oscillator has no further effect on
the dimmer circuit. When the lamp is turned on again by
activating the UP input, the SR flip-flop is reset and the DZ
clock is turned off.
When the Doze circuit is used, the connection between
DOZE input (Pin 2) and Vss (Pin 1), as shown in Figures
5A and 5B, should be removed.
FIGURE 7. OPERATING DESCRIPTION OF A FULL-FEATURE LS7535 WALL SWITCH
ON
See Application Note
AN 705 for the Schematic
DIM UP
OFF
DIM DOWN
AUTO DIM
DUAL CONTROL CONTINUOUS
DIMMER WITH UNIQUE
DELAYED OFF FEATURE
INITIAL CONDITION
Off
Off
On
On
On
On
Auto-Dimming
Auto-Dimming
Auto-Dimming
Auto-Dimming
Auto-Dimming
Auto-Dimming
ACTION
SHORT PRESS On
LONG PRESS On
LONG PRESS On
LONG PRESS Off
SHORT PRESS Off
PRESS Auto-Dim
SHORT PRESS On
LONG PRESS On
SHORT PRESS Off
LONG PRESS Off
PRESS Auto-Dim
None
RESULT
“Softly” turns On to memory intensity (1)
Varies from min. intensity towards max. intensity (2)
Varies towards max. intensity (2)
Varies towards min. intensity (3)
“Softly” turns Off
Begins auto-dimming to off (4)
“Softly” returns to memory intensity (5)
Varies towards max. intensity (2)
“Softly “ turns off
Varies towards min. intensity (3)
No change
Auto-dims to Off
(1) Last intensity achieved before turn off is stored as memory intensty.
(2) On (Dim Up) varies intensity towards maximum and stops there.
(3) Off (Dim Down) varies intensity towards minimum and stops there.
(4) Auto-dimming period controlled by RC components and intensity level when Auto-Dim is activated.
(5) Last intensity achieved before Auto-Dim started is stored as memory intensity.
7534/35-080796-8
LSI [ LSI COMPUTER SYSTEMS ]
