XRA1203 Datasheet | Exar

16-BIT I2C/SMBUS GPIO EXPANDER WITH RESET SEPTEMBER 2011 REV. 1.0.0 GENERAL DESCRIPTION The XRA1203 is a 16-bit GPIO expander with an I2C/ SMBus interface. After power-up, the XRA1203 has internal 100K ohm pull-up resistors on each I/O pin that can be individually enabled. In addition, the GPIOs on the XRA1203 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 XRA1203 is an enhanced version of the PCA9539 and TCA9539. The XRA1203 is pin and software patible with the PCA9539 and TCA9539 (note: software registers are patible to the PCA9539, but the I2C slave address is different). The XRA1203 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) - 5V tolerant inputs - Maximum stand-by current of 1u A at +1.8V - I2C/SMBus bus interface - I2C clock frequency up to 400k Hz - Noise filter on SDA and SCL inputs - Up to 16 I2C Slave Addresses - Individually programmable inputs - Internal pull-up resistors - Polarity inversion - Individual interrupt enable - Rising edge and/or Falling edge interrupt - Input filter - Individually programmable outputs - Output Level Control - Output Three-State Control - Open-drain active low interrupt output - Active-low reset input - Pin and software patible with PCA9539...