PCA9539 port equivalent, 16-bit i2c and smbus low power i/o port.
* 16-bit I2C-bus GPIO with interrupt and reset
* Operating power supply voltage range of 2.3 V to 5.5 V (3.0 V to 5.5 V
for PCA9539PW/Q900 and PCA9539RPW/Q900)
and was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide a simple solu.
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