HOW DOES IT WORK?

ADAC 2 Click is based on the MAX22000, an industrial-grade, software-configurable analog 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 (analog output) and the receive path (analog 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 analog I/O.

This Click board™ communicates with an 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. Other ranges can be achieved by configuring the appropriate registers.

The MAX22000 also offers one output marked as CIO, configured as voltage or current output, alongside three analog inputs (AI4, AI5, and AI6) configurable as voltage or current inputs. Besides their use as general-purpose analog inputs, the AI5 and AI6 pins can also be configured as a differential programmable gain amplifier (PGA) for either low-voltage or high-voltage inputs to support RTD and thermocouple measurements. A high-performance filter allows the ADC to provide 50Hz/60Hz normal mode rejection at selected ADC data rates.

Current measurement using the 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 analog switch to connect or disconnect the current sense resistor electronically for current measurements that do not use a differential sensor.

In addition, several mikroBUS™ pins are used. 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, analog output goes high impedance, analog inputs power down, and ADC conversion stops) while 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.

This Click board™ can only be operated 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