ADAC 2 Click Board™

Product Code: MIKROE-5475

How Does The ADAC 2 Click Board™ Work? The ADAC 2 Click Board™ is based on the MAX22000, an industrial-grade, software-configurable analogue input/output solution from Analog Devices. It provides a high-performance 18-bit DAC in the transmit path and a 24-bit delta-sigma ADC in the receive path. The transmit path (analogue output), and the receive path (analogue inputs) are entirely independent; thus, they can be programmed for different configurations and modes of operation. Thanks to its outstanding performance and features, this board is designed to support various industrial applications such as programmable logic controllers (PLCs), programmable automation controllers (PACs), and process control applications that require configurable analogue I/O. The ADAC 2 Click Board™ communicates with MCU through a standard SPI interface for all configuration and management information with a maximum frequency of 20MHz. The MAX22000 provides multiple voltages and current ranges for its inputs and outputs to maintain the best accuracy.

It sets the linear range at 105% of the nominal range and the full scale at 125% of the nominal range. For example, for a ±10V nominal range, the MAX22000 provides a linear range of ±10.5V and a full-scale range of ±12.5V. Achieving other ranges can be done by configuring the appropriate registers. The MAX22000 also offers one output marked as CIO, configured as voltage or current output, alongside three analogue inputs (AI4, AI5, and AI6) configurable as voltage or current inputs. Besides their use as general-purpose analogue inputs, the AI5 and AI6 pins can also be configured as differential programmable gain amplifiers (PGA) for either low-voltage or high-voltage inputs to support RTD and thermocouple measurements. A high-performance filter follows the ADC to provide 50Hz/60Hz normal mode rejection at selected ADC data rates. Current measurement using AI5 and AI6 pins relies on an external precision resistor to perform the current-to-voltage conversion. A GPIO pin on the additional GPIO header can control an external analogue switch to connect or disconnect the current sense resistor electronically for current measurements that do not use a differential sensor. In addition, it also uses several mikroBUS™ pins. An active-low reset signal routed on the RST pin of the mikroBUS™ socket activates a hardware reset of the system (all registers go to their power-on default states, analogue output goes high impedance, analogue inputs power down, and ADC conversion stops). In contrast, the INT pin on the mikroBUS™ socket represents a standard interrupt feature providing a user with feedback information. It also has an additional data-ready interrupt marked as RDY and routed on the AN pin of the mikroBUS™ socket, used to signal when a new ADC conversion result is available in the data register. The ADAC 2 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development. SPECIFICATIONS Type ADC-DAC Applications It can be used for industrial applications such as programmable logic controllers (PLCs), programmable automation controllers (PACs), and process control applications On-board modules MAX22000 - industrial-grade, software-configurable analog input/output solution from Analog Devices Key Features High accuracy, flexibility, software-configurable for voltage and current mode, high resolution, RTD and thermocouple measurements, SPI interface, additional GPIOs, protection features, and more Interface SPI Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the ADAC 2 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Data Ready RDY 1 AN PWM 16 NC Reset RST 2 RST INT 15 INT Interrupt SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13