The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallelInput/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed toenhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvementsinclude higher drive capability, 5 V I/O tolerance, lower supply current, individual I/Oconfiguration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide asimple solution when additional I/O is needed for ACPI power switches, sensors,push buttons, LEDs, fans, etc.
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