MaxTech NXP-16 Manual de usuario descargar pdf (Pagina 9)

Product data sheet Rev. 04 — 17 March 2009 9 of 29

NXP Semiconductors

PCA9532

16-bit I

C-bus LED dimmer

6.4 Pins used as GPIOs

LEDn pins not used to control LEDs can be used as General Purpose I/Os (GPIOs).

For use as input, set LEDn to high-impedance (00) and then read the pin state via the

INPUT0 or INPUT1 register.

For use as output, connect external pull-up resistor to the pin and size it according to the

DC recommended operating characteristics. LEDn 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 V

, an internal Power-On Reset (POR) holds the PCA9532 in

a reset condition until V

has reached V

POR

. At that point, the reset condition is released

and the PCA9532 registers are initialized to their default states, all the outputs in the

OFF state. Thereafter, V

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 t

w(rst)

. The

PCA9532 registers and I

C-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 V

if no active connection is used.

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MaxTech NXP-16 Manual de usuario Pagina 9