AD-SWIO Click is a quad-channel software configurable input/output solution based on AD74412R. The AD74412R is a quad-channel software configurable input/output integrated circuit for building and process control applications. The device provides a fully integrated single chip solution for input and output operation. The AD-SWIO Click contains four 13-bit DACs, one per chanal, and 16-bit Σ-∆ ADC. These options give a lot of flexibility in choosing functionality for analog output, analog input, digital input, resistance temperature detector (RTD), and thermocouple measurements integrated into a single chip solution with a serial peripheral interface (SPI).
The AD-SWIO Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
The AD-SWIO Click features a 16-bit analog-to-digital converter (ADC), and 13-bit digital-to-analog converter (DAC) embed in AD74412R from Analog Devices. There are several modes related to the AD74412R. These modes are voltage output, current output, voltage input, externally powered current input, loop powered current input, external RTD measurement, digital input logic, and loop powered digital input.
The ADC can measure either the voltage across the 100 Ω RSENSE or the voltage at the I/OP_x screw terminal of each channel. In high impedance mode, the ADC, by default, measures the voltage across the screw terminals (I/OP_x to I/ON_x) in a 0 V to 10 V range. The ADC also provides diagnostic information on user-selectable inputs such as supplies, internal die temperature, reference, and regulators.
The AD-SWIO Click has four GPO-x pins, one per channel ( GPO-A, GPO-B, GPO-C, GPO-D). Each channel GPO-x pin can be configured to the logic outputs of the digital input functions or a logic high or low output. The GPO-x pins can be set via the GPO_SELECT bits within the GPO_CONFIGx registers. The Click board™ also contains LVIN ( Low Voltage Input) pin, the measurement voltage range on this pin is 0V to 2.5V.
The AD74412R contains four 13-bit DACs, one per channel. Each DAC core is a 13-bit string DAC. The architecture structure consists of a string of resistors, each with a value of R. The digital input code that is loaded to the DAC_CODEx registers determines which node on the string the voltage is tapped off from and fed into the output amplifier. This architecture is inherently monotonic and linear.
The AD74412R have short-circuit limit in voltage output mode is programmable per channel. The circuit minimizes glitching on the I/OP_x screw terminal when the AVDD supply is ramping or when the use case configuration is changed. This short-circuit limit, you can regulate with positive analog supply on AVDD pin, Output voltage on AD-SWIO Click is limited to +20V. The AD-SWIO Click is equipped with the ADP1613 step-up dc-to-dc switching converters with an integrated power switch capable of providing an output voltage as high as 20 V also from Analog Devices.
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