SX1501 gpio equivalent, 4 channel low voltage gpio.
* 4/8/16 channel of I/Os True bi-directional style I/O Programmable Pull-up/Pull-down Push/Pull outputs
* 1.2V to 5.5V independent operating voltage for all suppl.
The SX1501, SX1502 and SX1503 have the ability to generate mask-programmable interrupts based on falling/rising edge of.
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