Bridge the gap between the digital and analog world with DAC80501 and PIC18F2455
Craft your analog path with DAC innovation
Published Dec 29, 2023
Click board™
DAC 9 Click
Dev Board
EasyPIC v7
Compiler
NECTO Studio
MCU
PIC18F2455
By translating binary codes into voltage levels, this solution amplifies data's voice, enabling systems to interpret, respond to, and leverage digital insights for various applications
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Hardware Overview
How does it work?
DAC 9 Click is based on the DAC80501, a single-channel, buffered, 16-bit resolution digital-to-analog converter from Texas Instruments. It includes a 2.5V, 5ppm/˚C internal reference, giving full-scale output voltage ranges of 1.25V, 2.5V, or 5V, and incorporates a Power-On Reset function. This function makes sure that the DAC80501 output powers up at zero scale or midscale and remains at that scale until a valid code is written to the device. High resolution and simple interface features make this Click board™ suitable for applications such as battery testers, communications equipment, factory automation, control, test and measurement, and more. The output channel, which DAC80501 routed to the VOUT terminal, consists of a rail-to-rail ladder
architecture with an output buffer amplifier that generates rail-to-rail voltages, giving a maximum output range of 0V to VDD. The full-scale output range of the DAC output is determined by the reference voltage on the VREFIO pin, the reference divider setting, and the gain configuration for that channel set by the corresponding BUFF-GAIN bit. When the DAC80501 uses an internal reference, this voltage is externally available at the VREF terminal and can source up to 5mA. Besides, the user can bring the external reference voltage on this terminal in the case of the DAC80501 external reference configuration. DAC 9 Click provides the possibility of using both I2C and SPI interfaces. The selection can be performed by positioning SMD jumpers labeled COMM SEL to an appropriate
position. Note that all jumpers must be placed on the same side, or the Click board™ may become unresponsive. In SPI mode, the DAC80501 uses a 3-Wire SPI serial interface that operates at clock rates of up to 50MHz, while in I2C mode, the DAC80501 can operate in Standard Mode (100 kbps), Fast Mode (400 kbps) and Fast-Plus Mode (1.0 Mbps). This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC 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.
Features overview
Development board
EasyPIC v7 is the seventh generation of PIC development boards specially designed to develop embedded applications rapidly. It supports a wide range of 8-bit PIC microcontrollers from Microchip and has a broad set of unique functions, such as a powerful onboard mikroProg programmer and In-Circuit debugger over USB-B. The development board is well organized and designed so that the end-user has all the necessary elements in one place, such as switches, buttons, indicators, connectors, and others. With four different connectors for each port, EasyPIC v7 allows you to connect accessory boards, sensors, and custom electronics more efficiently than ever. Each part of
the EasyPIC v7 development board contains the components necessary for the most efficient operation of the same board. An integrated mikroProg, a fast USB 2.0 programmer with mikroICD hardware In-Circuit Debugger, offers many valuable programming/debugging options and seamless integration with the Mikroe software environment. Besides it also includes a clean and regulated power supply block for the development board. It can use various external power sources, including an external 12V power supply, 7-23V AC or 9-32V DC via DC connector/screw terminals, and a power source via the USB Type-B (USB-B) connector. Communication options such as
USB-UART and RS-232 are also included, alongside the well-established mikroBUS™ standard, three display options (7-segment, graphical, and character-based LCD), and several different DIP sockets. These sockets cover a wide range of 8-bit PIC MCUs, from PIC10F, PIC12F, PIC16F, PIC16Enh, PIC18F, PIC18FJ, and PIC18FK families. EasyPIC v7 is an integral part of the Mikroe ecosystem for rapid development. Natively supported by Mikroe software tools, it covers many aspects of prototyping and development thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.
Microcontroller Overview
MCU Card / MCU
Architecture
PIC
MCU Memory (KB)
24
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
Used MCU Pins
mikroBUS™ mapper
Take a closer look
Click board™ Schematic
Step by step
Project assembly
Start by selecting your development board and Click board™. Begin with the EasyPIC v7 as your development board.
Track your results in real time
Application Output
This Click board can be interfaced and monitored in two ways:
Application Output- Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
UART Terminal- Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.
Software Support
Library Description
This library contains API for DAC 9 Click driver.
Key functions:
dac9_set_config- Set config functiondac9_set_gain- Set gain functiondac9_set_vout- Set Vout function
Open Source
Code example
The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.
/*!
* @file main.c
* @brief DAC9 Click example
*
* # Description
* This is an example that demonstrates the use of the DAC 9 Click board.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initalizes SPI or I2C driver and applies default settings.
*
* ## Application Task
* Demonstrates use of DAC 9 click board by changing output values every two seconds.
*
* @author Stefan Ilic
*
*/
#include "board.h"
#include "log.h"
#include "dac9.h"
static dac9_t dac9;
static log_t logger;
static uint16_t res = 2500;
void application_init ( void ) {
log_cfg_t log_cfg; /**< Logger config object. */
dac9_cfg_t dac9_cfg; /**< Click config object. */
/**
* Logger initialization.
* Default baud rate: 115200
* Default log level: LOG_LEVEL_DEBUG
* @note If USB_UART_RX and USB_UART_TX
* are defined as HAL_PIN_NC, you will
* need to define them manually for log to work.
* See @b LOG_MAP_USB_UART macro definition for detailed explanation.
*/
LOG_MAP_USB_UART( log_cfg );
log_init( &logger, &log_cfg );
log_info( &logger, " Application Init " );
// Click initialization.
dac9_cfg_setup( &dac9_cfg );
DAC9_MAP_MIKROBUS( dac9_cfg, MIKROBUS_1 );
err_t init_flag = dac9_init( &dac9, &dac9_cfg );
if ( ( I2C_MASTER_ERROR == init_flag ) || ( SPI_MASTER_ERROR == init_flag ) ) {
log_error( &logger, " Application Init Error. " );
log_info( &logger, " Please, run program again... " );
for ( ; ; );
}
log_printf( &logger, "---------------------\r\n" );
log_printf( &logger, " Soft reset \r\n" );
dac9_soft_reset( &dac9 );
Delay_ms( 200 );
log_printf( &logger, "---------------------\r\n" );
log_printf( &logger, " Vref divided by 2 \r\n" );
log_printf( &logger, " Set DAC gain of 2 \r\n" );
dac9_set_gain( &dac9, DAC9_GAIN_REF_DIV_2, DAC9_GAIN_BUFF_GAIN_2 );
Delay_ms( 100 );
log_printf( &logger, "---------------------\r\n" );
log_info( &logger, " Application Task " );
}
void application_task ( void ) {
uint16_t n_cnt;
for ( n_cnt = 0; n_cnt <= res; n_cnt += 500 ) {
log_printf( &logger, "Output Voltage : %d mV\r\n", ( uint16_t ) n_cnt );
dac9_set_vout( &dac9, n_cnt );
Delay_ms( 2000 );
}
}
void main ( void ) {
application_init( );
for ( ; ; ) {
application_task( );
}
}
// ------------------------------------------------------------------------ END
