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PCA9552D Datasheet(PDF) 11 Page - NXP Semiconductors |
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PCA9552D Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 21 page Philips Semiconductors Product data sheet PCA9552 16-bit I2C LED driver with programmable blink rates 2004 Oct 01 11 Programming example The following example will show how to set LED0 to LED3 on. It will then set LED4 and LED5 to blink at 1 Hz at a 50% duty cycle. LED6 and LED7 will be set to blink at 4 Hz and at a 25% duty cycle. LED8 to LED15 will be set to off. Table 1. I2C-bus Start S PCA9552 address with A0–A2 = low C0h PSC0 subaddress + auto-increment 12h Set prescaler PSC0 to achieve a period of 1 second: Blink period + 1 + PSC0 ) 1 44 PSC0 = 43 2Bh Set PWM0 duty cycle to 50%: 256 – PWM0 256 + 0.5 PWM0 = 128 80h Set prescaler PCS1 to achieve a period of 0.25 seconds: Blink period + 0.25 + PSC1 ) 1 44 PSC1 = 10 0Ah Set PWM1 output duty cycle to 25%: 256 – PWM1 256 + 0.25 PWM1 = 192 C0h Set LED0 to LED3 on 00h Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1 FAh Set LED8 to LED11 off 55h Set LED12 to LED15 off 55h Stop P |
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