GENERAL DESCRIPTION
GPIO devices can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial communication and control from a remote location is advantageous. The core is operating as low as 1.2V while the I/O banks can operate between 1.2V and 5.5V independent of the core voltage and each other. Each GPIO is programmable via 8-bit configuration registers. Data registers, direction registers, pullup/pull-down registers, interrupt mask registers and interrupt registers allow the system master to program and configure 4 or 8 or 16-GPIOs using a standard 400kHz I2C interface. The SX1501, SX1502 and SX1503 offer a unique fully programmable logic functions like a PLD to give more flexibility and reduce external logic gates used for standard applications. The SX1501, SX1502 and SX1503 have the ability to generate mask-programmable interrupts based on falling/rising edge of any of its GPIO lines. A dedicated pin indicates to a host controller that a state change occurred in one or more of the GPIO lines.
Semtech Corporation
