Analogue, Mixed Signal, LSI


GPIO expanders

23 November 2011 Analogue, Mixed Signal, LSI

New from Exar are the XRA120x I²C/SMBus and XRA140x SPI GPIO expander product families – a total of 12 device offerings. The GPIO (general purpose input/output) expander products enable straightforward serial expansion of I/O through an industry-standard I²C, SMBus or SPI interface. GPIO products can provide additional control and monitoring when the microcontroller or chipset has an insufficient number of I/O pins or in systems where serial communication and control from a remote location is advantageous.

The XRA120x and XRA140x can operate from 1,65 V to 3,6 V with 5 V tolerant inputs. Depending on the part number, there are eight or 16 GPIOs. When configured as an input, each GPIO has an internal pull-up resistor that can be enabled or disabled. The polarity of the input can also be inverted and there are filters on each input so that noise or glitches on the inputs will be ignored. The input filter feature can also be disabled.

The interrupt for the GPIO can be configured to generate an interrupt on the rising edge, falling edge or both edges. There are individual interrupt enable and interrupt statuses for all of the GPIOs so that the software can easily identify which input generated the interrupt. When configured as an output, the GPIO output levels can individually be controlled or tri-stated.

The XRA120x can operate with an I²C/SMBus frequency up to 400 kHz. There are noise filters on both of the SDA and SCL inputs and there can be up to 32 I²C slave addresses. The XRA140x can operate with an SPI clock frequency of up to 26 MHz, addressing applications that require higher GPIO switching rates.



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