ADC 3 Click

How does it work?

ADC 3 Click is based on the MCP3428, a differential multi-channel low-power, 16-bit ΔΣ A/D converter from Microchip. The MCP3428 contains an input channel selection multiplexer (CH1, CH2, CH3, or CH4), an onboard voltage reference, and an internal oscillator. It performs conversions at rates of 15, 60, or 240 samples per second (12, 14, or 16 bits), depending on user-controllable configuration bit settings, and has a programmable gain amplifier (x1, x2, x4, or x8) which makes it an ideal choice for monitoring extremely low-voltage sensors. All four channels have differential inputs monitoring a full-scale range of 4.096VDC or ±2.048V differentially.

The MCP3428 has two conversion modes: Continuous and One-Shot mode. In the Continuous Conversion mode, the ADC converts the inputs continuously, while in the One-Shot Conversion mode, the MCP3428 converts the input one time and stays in the low-power Standby mode until it receives another command for a new conversion. The standby mode reduces current consumption significantly during idle periods. This ADDC can be used for various high-accuracy analog-to-digital data conversion applications where ease of use and low power consumption are significant considerations.

ADC 3 Click communicates with an MCU using the standard I2C 2-Wire interface to read data and configure settings, supporting High-Speed Mode up to 3.4MHz. It also has a 7-bit slave address with the first four MSBs fixed to 1101. The address pins, ADR0 and ADR1, are programmed by the user and determine the value of the last three LSBs of the slave address, allowing up to 8 devices to operate on the same bus segment. The value of these address pins can be set by positioning onboard SMD jumpers labeled as I2C ADR to an appropriate position marked as 0 or 1.

This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the PWR SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on ADC 3 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	NC
	NC	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

ADC 3 Click electrical specifications

Software Support

We provide a library for the ADC 3 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for ADC 3 Click driver.

Key functions

• This function is used to initiate general call reset.

• This function is used to read ADC value and calculate voltage.

Example Description

ADC 3 example code shows usage of analog-to-digital converter.

 void application_task ( void ) 
 { 
     read_volt = adc3_read_voltage( &adc3, ADC3_SELECT_CHANNEL_1, ADC3_SAMPLE_RATE_12, ADC3_PGA_GAIN_X1 ); 
     Delay_ms( 100 ); 
     log_printf( &logger, "Channel 1 : %0.2f  V rn", read_volt ); 

     read_volt = adc3_read_voltage( &adc3, ADC3_SELECT_CHANNEL_2, ADC3_SAMPLE_RATE_12, ADC3_PGA_GAIN_X1 ); 
     Delay_ms( 100 ); 
     log_printf( &logger, "Channel 2 : %0.2f  V rn", read_volt ); 

     read_volt = adc3_read_voltage( &adc3, ADC3_SELECT_CHANNEL_3, ADC3_SAMPLE_RATE_12, ADC3_PGA_GAIN_X1 ); 
     Delay_ms( 100 ); 
     log_printf( &logger, "Channel 3 : %0.2f  V rn", read_volt ); 

     read_volt = adc3_read_voltage( &adc3, ADC3_SELECT_CHANNEL_4, ADC3_SAMPLE_RATE_12, ADC3_PGA_GAIN_X1 ); 
     Delay_ms( 100 ); 
     log_printf( &logger, "Channel 4 : %0.2f  V rn", read_volt ); 

     log_printf( &logger, "--------------------------rn" ); 
     Delay_ms( 1000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Adc3

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK - Mikroe Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.