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PCA9533D01 Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCA9533D01 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 18 page Philips Semiconductors Product data sheet PCA9533 4-bit I2C LED dimmer 2004 Oct 01 10 Programming example The following example will show how to set LED0 and LED1 off. It will set LED2 to blink at 1 Hz, 50 % duty cycle. LED3 will be set to be dimmed at 25 % of their maximum brightness (duty cycle = 25 %). PCA9533/01 is used in this example. Table 1. I2C-bus Start S PCA9533 address C4h PSC0 subaddress + auto-increment 11h Set prescaler PSC0 to achieve a period of 1 second: Blink period + 1 + PSC0 ) 1 152 PSC0 = 151 97h Set PWM0 duty cycle to 50 %: PWM0 256 + 0.5 PWM0 = 128 80h Set prescaler PWM1 to dim at maximum frequency Blink period + maximum PSC1 = 0 00h Set PWM1 output duty cycle to 25 %: PWM1 256 + 0.25 PWM1 = 64 40h Set LED0 on, LED1 off, LED2 set to blink at PSC0, PWM0, LED3 set to blink at PCS1, PWM1 E1h Stop P |
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