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PCA9552 Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA9552 Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 28 page PCA9552_5 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 05 — 9 March 2006 9 of 28 Philips Semiconductors PCA9552 16-bit I2C-bus LED driver with programmable blink rates 6.4 Pins used as GPIOs LED pins not used to control LEDs can be used as general purpose I/Os (GPIOs). For use as input, set LEDn 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. 6.5 Power-on reset When power is applied to VDD, an internal Power-On Reset (POR) holds the PCA9552 in a reset condition until VDD has reached VPOR. At that point, the reset condition is released and the PCA9552 registers are initialized to their default states. Thereafter, VDD must be lowered below 0.2 V to reset the device. 6.6 External RESET A reset can be accomplished by holding the RESET pin LOW for a minimum of tw(rst). The PCA9552 registers and I2C-bus state machine will be held in their default states 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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