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PCA9552BS Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9552BS Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 21 page Philips Semiconductors Product data sheet PCA9552 16-bit I2C LED driver with programmable blink rates 2004 Oct 01 6 PWM0 — PWM REGISTER 0 bit 7 6 5 4 3 2 1 0 default 1 0 0 0 0 0 0 0 The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED off) when the count is less than the value in PWM0 and HIGH when it is greater. If PWM0 is programmed with 00h, then the PWM0 output is always LOW. The duty cycle of BLINK0 is: 256 – PWM0 256 PSC1 — FREQUENCY PRESCALER 1 bit 7 6 5 4 3 2 1 0 default 1 1 1 1 1 1 1 1 PSC1 is used to program the period of PWM output. The period of BLINK1 + (PSC1 ) 1) 44 PWM1 — PWM REGISTER 1 bit 7 6 5 4 3 2 1 0 default 1 0 0 0 0 0 0 0 The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED off) when the count is less than the value in PWM1 and HIGH when it is greater. If PWM1 is programmed with 00h, then the PWM1 output is always LOW. The duty cycle of BLINK1 is: 256 – PWM1 256 LS0 — LED 0–3 SELECTOR LED 3 LED 2 LED 1 LED 0 bit 7 6 5 4 3 2 1 0 default 0 1 0 1 0 1 0 1 LS1 — LED 4–7 SELECTOR LED 7 LED 6 LED 5 LED 4 bit 7 6 5 4 3 2 1 0 default 0 1 0 1 0 1 0 1 LS2 — LED 8–11 SELECTOR LED 11 LED 10 LED 9 LED 8 bit 7 6 5 4 3 2 1 0 default 0 1 0 1 0 1 0 1 LS3 — LED 12–15 SELECTOR LED 15 LED 14 LED 13 LED 12 bit 7 6 5 4 3 2 1 0 default 0 1 0 1 0 1 0 1 The LSx LED select registers determine the source of the LED data. 00 = Output is set LOW (LED on) 01 = Output is set Hi-Z (LED off – default) 10 = Output blinks at PWM0 rate 11 = Output blinks at PWM1 rate PINS USED AS GENERAL PURPOSE I/Os LED pins not used to control LEDs can be used as general purpose I/Os. For use as input: Set LEDx to high-impedance (01) and then read the pin state via the input register. For use as output: Connect external pull-up resistor to the pin and size it according to the DC recommended operating characteristics. LED output pin is HIGH when the output is programmed as high-impedance, and LOW when the output is programmed LOW through the “LED selector” register. The output can be pulse-width controlled when PWM0 or PWM1 are used. POWER-ON RESET When power is applied to VDD, an internal Power-On Reset holds the PCA9552 in a reset condition until VDD has reached VPOR. At this point, the reset condition is released and the PCA9552 registers are initialized to their default states, all the outputs in the off state. Thereafter, VDD must be lowered below 0.2 V to reset the device. EXTERNAL RESET A reset can be accomplished by holding the RESET pin LOW for a minimum of tW. The PCA9552 registers and I2C state machine will be held in their default state until the RESET input is once again HIGH. This input requires a pull-up resistor to VDD if no active connection is used. |
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