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CAT3637HV3-GT2 Datasheet(PDF) 10 Page - Catalyst Semiconductor

No. de pieza CAT3637HV3-GT2
Descripción Electrónicos  6-Channel Programmable High Efficiency Quad-Mode??LED Driver
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT3637HV3-GT2 Datasheet(HTML) 10 Page - Catalyst Semiconductor

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CAT3637
Doc. No. MD-5033 Rev. A
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
LED Current Setting
The current in each of the six LED channels is
programmed through the 1-wire EN/SET digital control
input. At the initial power-up and once the EN/SET is
set high, the LED current remains at zero in all
channels. On the first EN/SET pulse (positive edge),
the current is set to 2mA in all channels. On each
consecutive pulse, the current is incremented by 2mA.
On the 15
th pulse, the current is equal to the full scale
of 30mA. On the following pulse (16
th pulse), the
current goes back to zero and the previous sequence
can be repeated. The EN/SET pin can be pulsed at
high frequency 15 times to decrement the current by
2mA or to program the current from 0mA to 30mA.
The
maximum
EN/SET
signal
frequency
for
programming the LED current is 2.5MHz.
To power-down the device and turn-off all current
sources, the EN/SET input should be kept low for a
duration TOFF of 1.5ms or more. The driver typically
powers-down with a delay of about 1ms.
Figure 3. EN/SET One Wire Addressable Timing Diagram
TD
2mA 4mA
2mA
0mA
0mA
6mA
28mA 30mA
Shutdown
EN/SET
LED
Current
Shutdown
THI
TLO
TOFF
Figure 4. EN/SET Program Increasing / Decreasing LED Current by 2mA


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