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SX1508QBIULTRT Datasheet(PDF) 18 Page - Semtech Corporation |
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SX1508QBIULTRT Datasheet(HTML) 18 Page - Semtech Corporation |
18 / 37 page ADVANCED COMMUNICATIONS & SENSING Rev 4 – 26 th April 2011 18 www.semtech.com SX1508QB/SX1509QB World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine t t 1 0 Fade In ON Fade Out OFF 0 100% TRiseX TFallX TOnX TOffX IO[X] Intensity (PWM value) RegData[X] IOffX IOnX Figure 14 – LED Driver Overview Each IO[X] has its own set of programmable registers (Cf §5 for more detailed information): RegTOnX (blinking capable I/Os only): TOnX, ON time of IO[X] RegIOnX (all I/Os): IOnX, ON intensity of IO[X] RegOffX (blinking capable I/Os only): TOffX and IOffX, OFF time and intensity of IO[X] RegTRiseX(breathing capable I/Os only): TRiseX, fade in time of IO[X] RegTFallX(breathing capable I/Os only): TFallX, fade out time of IO[X] Please note that the LED driver mode is selectable for each IO bank between linear and logarithmic. (Cf §4.8.5) All the figures assume normal IO polarity, for inverse polarity RegData control must be inverted (does not invert the polarity of the IO signal itself). 4.8.2 Static Mode Only mode available for non blinking capable IOs (with Off intensity = 0), else invoked when TOnX = 0. If the I/O doesn’t support fading the LED intensity will step directly to the IOnX/IOffX value. RegData(X) IOLED(X) level Off intensity(min) determined by register RegIOffX On intensity(max) determined by register RegIOnX Fade in rate determined by register RegTRiseX Fade out rate determined by register RegTFallX Figure 15 – LED Driver Static Mode 4.8.3 Single Shot Mode Invoked when TOnX != 0 and TOffX = 0. If the I/O doesn’t support fading the LED intensity will step directly to the IOnX/IOffX value. |
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