XRA1405

XRA1405 16-BIT SPI GPIO EXPANDER WITH INTEGRATED LEVEL SHIFTERS SEPTEMBER 2011 REV. 1.0.0 GENERAL DESCRIPTION The XRA1405 is an 16-bit GPIO expander with an SPI interface. After power-up, the XRA1405 has internal 100K ohm pull-up resistors on each I/O pin that can be individually enabled. In addition, the GPIOs on the XRA1405 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 XRA1405 is available in 24-pin QFN and 24-pin TSSOP packages. FEATURES 1.65V to 3.6V operating voltage 16 General Purpose I/Os (GPIOs) Integrated Level Shifters 5V tolerant inputs Maximum stand-by current of 1uA at +1.8V SPI bus interface ■ SPI Clock Frequency up to 26MHz Individually programmable inputs ■ Internal pull-up resistors ■ Polarity inversion ■ Individual interrupt enable ■ Rising edge and/or Falling edge interrupt ■ Input filter Individually pr...