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Toshiba TB72725 16bit Led driver - Status at power up

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tb72725

Hi All,

I have a problem that is driving me nuts! I have a board that uses 3 constant current led drivers to drive some leds. At power up leds light randomly and only after I program the drivers to zero they go off. The output enable is active low and I have a pull up resistor (4k7) on OE pin, so at power up the driver outputs are disabled. Why the leds ligth up ? Is annoying that the leds light a power up. Any one knows a what I'm doing wrong ? This happens even when the board is not connected to the microcontroller.

TIA
 

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