How the I2C Bus Works - EEWeb
How the I2C Bus Works - EEWeb
How the I2C Bus Works - EEWeb
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Frequency<br />
Duty Cycle<br />
PWM 0<br />
256<br />
PCA953x I 2 C LED Dimmers<br />
0 (00 H ) 255 (FF H )<br />
160 Hz 1.6 s<br />
0 % 99.6 %<br />
ON OFF ON<br />
PWM 1<br />
256<br />
PSC 0 + 1<br />
160<br />
ON OFF ON OFF ON<br />
PSC 1 + 1<br />
160<br />
ON = LED ON<br />
OFF = LED OFF<br />
OFF<br />
State machine defaults to highest frequency<br />
at power on and duty cycle goes from 0%<br />
(off) to 99.6% (almost always on) for better<br />
dimming control.<br />
0 0 PWM0<br />
0 0 0 0<br />
0 0 PSC0 0PSC0 0 0 0<br />
0 0 PWM1<br />
0 0 0 0<br />
0 0 PSC1 0PSC1 0 0 0<br />
0 LED 0LED 0Selector<br />
Selector 0 0 0<br />
ON, ON,<br />
OFF, BR1, BR1,<br />
BR2<br />
Semiconductors 47
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