CAT3637AEVB ON Semiconductor, CAT3637AEVB Datasheet - Page 11

• Manufacturer Part Number: CAT3637AEVB
• Description: Power Management IC Development Tools EVAL BOARD
• Manufacturer: ON Semiconductor
• Type: Charge Pumpsr

Specifications of CAT3637AEVB

• Product: Power Management Modules
• Tool Is For Evaluation Of: CAT3637A
• Output Current: 30 mA

LED Current Setting
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 2 mA
in all channels. On each consecutive pulse, the current is
incremented by 2 mA. On the 15
to the full scale of 30 mA. On the following pulse (16
pulse), the current goes back to zero and the previous
The current in each of the six LED channels is
EN/SET
Current
LED
Shutdown
Figure 25. EN/SET Program Increasing / Decreasing LED Current by 2 mA
Figure 24. EN/SET One Wire Addressable Timing Diagram
0 mA
th
T
D
pulse, the current is equal
T
HI
2 mA 4 mA
6 mA
http://onsemi.com
T
LO
th
28 mA 30 mA
11
sequence can be repeated. The EN/SET pin can be pulsed at
high frequency 15 times to decrement the current by 2 mA
or to program the current from 0 mA to 30 mA. The
maximum EN/SET signal frequency for programming the
LED current is 2.5 MHz.
sources, the EN/SET input should be kept low for a duration
T
with a delay of about 1 ms.
OFF
To power−down the device and turn−off all current
of 1.5 ms or more. The driver typically powers−down
0 mA
2 mA
T
OFF
Shutdown