CAT3616 Datasheet, PDF (11/14 Pages) Catalyst Semiconductor – 6-Channel Charge Pump LED Driver with EZDimTM

APPLICATION INFORMATION
Single wire Dimming Application
The dimming control can be achieved through a single
wire interface by connecting together all three logic
input signals EN, E¯N¯M¯ and E¯N¯¯S as shown on Figure 3.
The common enable signal is set high to enable the
driver. On the first negative going pulse, the LEDs turn
CAT3616
full on. The pulse low state duration (between the
falling and rising edges) must be shorter than
0.5msec. Any consecutives pulses reduce the LED
current by 1mA. The enable signal is kept low for
more than 1.5msec to turn off all the LED channels
and set the driver in shutdown mode, as shown on
Figures 4.
Figure 3. Single Wire Dimming Control
Figure 4. Single Enable Timing Diagram
© 2006 Catalyst Semiconductor, Inc.
11
Characteristics subject to change without notice
Doc. No. 5018 Rev. A