The XRA1202 is an 8-bit GPIO expander with an I2C/SMBus interface. After power-up, the XRA1202 has internal 100K ohm pull-up resistors on each I/O pin that can be individually enabled.
In addition, the GPIOs on the XRA1202 can individually be controlled and configured. As outputs, the GPIOs can be outputs that are high, low or in three-state mode. The three-state mode feature is useful for applications where the power is removed from the remote devices, but they may still be connected to the GPIO expander.
As inputs, the internal pull-up resistors can be enabled or disabled and the input polarity can be inverted. The interrupt can be programmed for different behaviors. The interrupts can be programmed to generate an interrupt on the rising edge, falling edge or on both edges. The interrupt can be cleared if the input changes back to its original state or by reading the current state of the inputs.
The XRA1202 is an enhanced version of the PCA9538. The XRA1202 is pin and software compatible with the PCA9538 (note: software registers are compatible to the PCA9538, but the I2C slave address is different).
The XRA1202 is available in 16-pin QFN and 16-pin TSSOP packages.
For technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.