ADC Click

How does it work?

ADC Click is based on the MCP3204, a 4-channel 12-bit A/D converter with SPI serial interface from Microchip. The MCP3204 contains an input channel selection multiplexer (CH0, CH1, CH2, CH3) which for reference can use the VCC (3.3V or 5V) or a 4.096V of the MCP1541 voltage reference from Microchip. The voltage reference determines the analog voltage range and can be selected via REFERENCE onboard jumper. To connect the analog voltages to the ADC Click, utilize the four labeled terminals CH0-3 along with two GND terminals for referencing the ground. Each analog input pin goes through the MCP6284, a 5MHz rail-to-rail OpAmp from Microchip.

The ADC Click uses a standard 4-Wire SPI serial interface to communicate with the host MCU, supporting both 0 and 3 of the SPI modes and operating at clock rates of up to 2MHz. Communication with the ADC Click is initiated by bringing the CS line LOW.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the PWR SEL jumper. This way, both 3.3V and 5V capable MCUs can 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 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
SPI Chip Select	CS	3	CS	RX	14	NC
SPI Clock	SCK	4	SCK	TX	13	NC
SPI Data OUT	SDO	5	MISO	SCL	12	NC
SPI Data IN	SDI	6	MOSI	SDA	11	NC
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 Click electrical specifications

Software Support

We provide a library for the ADC 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 Click driver.

Key functions

• Get Single-Ended Channel function.

• Get Pseudo-Differential Pair function.

Example Description

This example demonstrates the use of ADC Click board. The all channels can be configured as single-ended or pseudo-differential pair.

 void application_task( void ) 
 { 
     adc_get_single_ended_ch( &adc, ADC_CH0_OR_CH01 ); 
     adc_get_single_ended_ch( &adc, ADC_CH1_OR_CH10 ); 
     adc_get_single_ended_ch( &adc, ADC_CH2_OR_CH23 ); 
     adc_get_single_ended_ch( &adc, ADC_CH3_OR_CH32 ); 
     adc_get_differential_ch( &adc, ADC_CH0_OR_CH01 ); 

     log_printf( &logger, "* CH0 = %u mVrn", adc.ch0 ); 
     log_printf( &logger, "* CH1 = %u mVrn", adc.ch1 ); 
     log_printf( &logger, "* CH2 = %u mVrn", adc.ch2 ); 
     log_printf( &logger, "* CH3 = %u mVrn", adc.ch3 ); 
     log_printf( &logger, "* CH0 - CH1 = %d mVrn", adc.ch01 ); 
     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.Adc

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.