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CAT3637HV3-GT2 Datasheet(PDF) 10 Page - Catalyst Semiconductor |
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CAT3637HV3-GT2 Datasheet(HTML) 10 Page - Catalyst Semiconductor |
10 / 14 page 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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