DAC 17 Click

How does it work?

DAC 17 Click is based on the DAC7558, a 12-bit, octal-channel voltage output DAC from Texas Instruments, known for its exceptional linearity and monotonicity. Its proprietary architecture mitigates undesired transients, such as code-to-code glitches and channel-to-channel crosstalk. Operating within a voltage range of 2.7V to 5.5V, the DAC7558 offers versatility. The board provides the flexibility of powering the IC internally or externally by setting the VCC SEL jumper to either the VIO or VEXT position. The VIO option enables internal powering of the Click board™, providing a choice between 3.3V or 5V. On the other hand, the VEXT option allows users to externally supply power in the range of 2.7 to 5.5V (applied to VEXT pins), offering flexibility in power supply according to specific system requirements.

Featuring output amplifiers capable of driving a 2Ω, 200pF load rail-to-rail with a rapid settling time of 5µs, the DAC7558 ensures precise and efficient performance. Users can configure the output range of DAC channels (from CHA to CHH) by connecting an external voltage reference to one of the REFx terminals in a range from 0V to a value of the main IC supply, VCC. Additionally, the board offers a selection between internal and external voltage reference sources. This selection is made via the VREF SEL jumpers, allowing users to choose between internal or external voltage reference options.

The DAC7558 offers versatility in operation, with the ability to update outputs simultaneously or sequentially. Its integrated Power-on-Reset circuit guarantees that DAC outputs power up to zero volts during initialization. Furthermore, a Power-Down feature, controllable via the PD pin of the mikroBUS™ socket, reduces the device’s current consumption to under 2µA, enhancing efficiency and prolonging battery life.

Communication with the host MCU is achieved through the 4-wire SPI serial interface, supporting clock rates of up to 50MHz. This interface is compatible with SPI, QSPI, Microwire™, and DSP standards, ensuring easy integration into various systems. The DAC7558 also uses an active-low reset feature via the RST pin on the mikroBUS™ socket. When the RST pin is set to a LOW logic state, all DAC channels are reset to zero scale.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VIO SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this 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 DAC 17 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	PD	Power-Down
Reset / ID SEL	RST	2	RST	INT	15	NC
SPI Select / ID COMM	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

DAC 17 Click electrical specifications

Software Support

We provide a library for the DAC 17 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 DAC 17 Click driver.

Key functions

• dac17_send_command This function is used to send specific command of the DAC 17 click board.

• dac17_set_dac_output This function is used to set output level of the sellected channel of the DAC 17 click board.

• dac17_set_all_dac_output This function is used to set output level of the DAC 17 click board.

Example Description

This example demonstrates the use of DAC 17 Click board by changing the voltage level on the output channels.

void application_task ( void ) 
 { 
     #define DAC17_OUTPUT_ZERO           0x0000u 
     #define DAC17_OUTPUT_MID_SCALE      0x0800u 
     #define DAC17_OUTPUT_FULL_SCALE     0x0FFFu 

     log_printf( &logger, " Setting all channels to full scale output rn" ); 
     dac17_set_all_dac_output( &dac17, DAC17_OUTPUT_FULL_SCALE ); 
     Delay_ms( 2000 ); 

     log_printf( &logger, " Setting all channels outputs to zero rn" ); 
     dac17_set_all_dac_output( &dac17, DAC17_OUTPUT_ZERO ); 
     Delay_ms( 2000 ); 

     log_printf( &logger, " Setting all channels outputs to mid scale rn" ); 
     dac17_set_all_dac_output( &dac17, DAC17_OUTPUT_MID_SCALE ); 
     Delay_ms( 2000 ); 
 }

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.DAC17

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.