Intermediate
30 min

Bipolar voltage booster made easy with LT3582 and PIC18F57Q43

Dual voltage dynamo

Boost-INV Click with Curiosity Nano with PIC18F57Q43

Published Feb 13, 2024

Click board™

Boost-INV Click

Dev Board

Curiosity Nano with PIC18F57Q43

Compiler

NECTO Studio

MCU

PIC18F57Q43

From positive to negative, we've got your voltage covered!

A

A

Hardware Overview

How does it work?

Boost-INV Click is based on the LT3582, a programmable boost and inverting DC/DC converter with OTP memory from Analog Devices. This IC is a dual circuit, offering a boost DC/DC converter and an inverter in one package. The boost converter can provide up to 12.78V on the output while driving the load with up to 350mA. The inverter can provide -13.95V, offering up to 600mA to the connected load, before the current limiting is activated. The boost converter uses an advanced switching scheme with the source-grounded NMOS as the main switching element, controlling the off-time and the peak current. The programmable voltage divider on the output provides the feedback voltage needed for the regulation. The inverter topology allows a single inductor to be used on the output, simplifying the design. As mentioned, the LT3582 features programmable parameters, which can be accessed via the I2C interface. These parameters include configuring the output voltages, power sequencing, and output voltage ramp rates. An onboard OTP non-volatile memory can be programmed with values that will be used at the startup. The command register (CMDR) is reset to 0x00h upon powering up, which turns off the outputs and sets the device to read parameters

stored in the OTP area. If the OTP memory area is empty, it is necessary to set up working parameters first (output voltage, power-up sequence, charging current for the ramp-up capacitors, and more) before using the device. It is worth mentioning that there are three bits in the CMDR register, referred to as RSEL0, RSEL1, and RSEL2 in the LT3582 datasheet, which redirects the device to use either registers or the OTP memory. When set to 0, the device uses parameters stored in the OTP memory. Note that 0x00h is the default value of the CMDR register, meaning settings stored in the OTP will be used by default after powering on. It is possible to dynamically change the values of the output voltages and other configurable working parameters. However, turning off the device (SWOFF bit of the CMDR register) is highly recommended before modifying working parameters since large output voltage changes can cause large current spikes on the switching circuitry if performed in real time while the switching circuit is running. Programming the OTP requires an external power source, which is fairly filtered (possibly with a filtering capacitor on the output). Voltage drop under 13V might trigger the FAULT bit and render the device unusable.

This voltage ranges from 13V to 15V. The Click board™ has the standard 2.54mm (100mil) header. Once the programming voltage is connected (VPP pad), the WOTP bit of the CMDR register initiates the programming. The complete algorithm with a detailed description of the OTP programming procedure can be found in the LT3582 datasheet. An onboard SMD jumper labeled as VSEL allows selection between the 3.3V and 5V power rail from mikroBUS™, routing it to the voltage input pin of the LT3582 IC. The I2C pull-up resistors are also connected to this voltage, allowing communication with both 3.3V and 5V MCUs. The Click board™ also offers the I2C address selection jumper, labeled as the I2C ADD. This jumper selects between two possible 7-bit addresses: the left position sets the I2C slave address to 0x49h, while the right position sets the address to 0x69h. Note that this is the 7-bit address only - to get the complete I2C address, an R/W bit needs to be added at the end. Input screw terminals allow secure connection for the load and are clearly labeled to avoid confusion: the V- pin offers the negative voltage, while the V+ pin outputs positive voltage. GND pins are connected to the common ground of the Click board™.

Boost-INV Click hardware overview image

Features overview

Development board

PIC18F57Q43 Curiosity Nano evaluation kit is a cutting-edge hardware platform designed to evaluate microcontrollers within the PIC18-Q43 family. Central to its design is the inclusion of the powerful PIC18F57Q43 microcontroller (MCU), offering advanced functionalities and robust performance. Key features of this evaluation kit include a yellow user LED and a responsive

mechanical user switch, providing seamless interaction and testing. The provision for a 32.768kHz crystal footprint ensures precision timing capabilities. With an onboard debugger boasting a green power and status LED, programming and debugging become intuitive and efficient. Further enhancing its utility is the Virtual serial port (CDC) and a debug GPIO channel (DGI

GPIO), offering extensive connectivity options. Powered via USB, this kit boasts an adjustable target voltage feature facilitated by the MIC5353 LDO regulator, ensuring stable operation with an output voltage ranging from 1.8V to 5.1V, with a maximum output current of 500mA, subject to ambient temperature and voltage constraints.

PIC18F57Q43 Curiosity Nano double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

PIC

MCU Memory (KB)

128

Silicon Vendor

Microchip

Pin count

48

RAM (Bytes)

8196

You complete me!

Accessories

Curiosity Nano Base for Click boards is a versatile hardware extension platform created to streamline the integration between Curiosity Nano kits and extension boards, tailored explicitly for the mikroBUS™-standardized Click boards and Xplained Pro extension boards. This innovative base board (shield) offers seamless connectivity and expansion possibilities, simplifying experimentation and development. Key features include USB power compatibility from the Curiosity Nano kit, alongside an alternative external power input option for enhanced flexibility. The onboard Li-Ion/LiPo charger and management circuit ensure smooth operation for battery-powered applications, simplifying usage and management. Moreover, the base incorporates a fixed 3.3V PSU dedicated to target and mikroBUS™ power rails, alongside a fixed 5.0V boost converter catering to 5V power rails of mikroBUS™ sockets, providing stable power delivery for various connected devices.

Curiosity Nano Base for Click boards accessories 1 image

Used MCU Pins

mikroBUS™ mapper

NC
NC
AN
Chip Enable
PA7
RST
NC
NC
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
NC
NC
PWM
NC
NC
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PB2
SCL
I2C Data
PB1
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

Boost-INV Click Schematic schematic

Step by step

Project assembly

Curiosity Nano Base for Click boards front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Curiosity Nano with PIC18F57Q43 as your development board.

Curiosity Nano Base for Click boards front image hardware assembly
Charger 27 Click front image hardware assembly
PIC18F47Q10 Curiosity Nano front image hardware assembly
Prog-cut hardware assembly
Charger 27 Click complete accessories setup image hardware assembly
Curiosity Nano with PICXXX Access MB 1 - upright/background hardware assembly
Necto image step 2 hardware assembly
Necto image step 3 hardware assembly
Necto image step 4 hardware assembly
Necto image step 5 hardware assembly
Necto image step 6 hardware assembly
PIC18F57Q43 Curiosity MCU Step hardware assembly
Necto No Display image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Debug Image Necto Step hardware assembly

Track your results in real time

Application Output via Debug Mode

1. Once the code example is loaded, pressing the "DEBUG" button initiates the build process, programs it on the created setup, and enters Debug mode.

2. After the programming is completed, a header with buttons for various actions within the IDE becomes visible. Clicking the green "PLAY" button starts reading the results achieved with the Click board™. The achieved results are displayed in the Application Output tab.

DEBUG_Application_Output

Software Support

Library Description

This library contains API for Boost-INV Click driver.

Key functions:

  • boostinv_enable - Functions for enable chip

  • boostinv_set_positive_voltage - Functions for set positive output voltage

  • boostinv_set_negative_voltage - Functions for set negative output voltage

Open Source

Code example

This example can be found in NECTO Studio. Feel free to download the code, or you can copy the code below.

/*!
 * \file 
 * \brief BoostInv Click example
 * 
 * # Description
 * Changes the positive and negative output voltage. Input Voltage 3.3V.
 * Positive output voltage goes from 3200mV, 7750mV, 12000mV and 7750mV.
 * Negative output voltage goes from -1450mV, -6700mV, -11050mV and -6700mV.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 * Initializes I2C module and sets EN ( RST ) pin as output.
 * 
 * ## Application Task  
 * Changes the positive and negative output voltage every 5 sec.
 * 
 * \author Luka FIlipovic
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "boostinv.h"

// ------------------------------------------------------------------ VARIABLES

static boostinv_t boostinv;
static log_t logger;

// ------------------------------------------------------ APPLICATION FUNCTIONS

void application_init ( void )
{
    log_cfg_t log_cfg;
    boostinv_cfg_t cfg;

    /** 
     * 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.

    boostinv_cfg_setup( &cfg );
    BOOSTINV_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    boostinv_init( &boostinv, &cfg );
    
    boostinv_default_cfg ( &boostinv );
    log_printf( &logger, "     Boost INV Click\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    Delay_ms( 100 );
}

void application_task ( void )
{
    // Sets Positive output voltage
    
    log_printf( &logger, " Positive output voltage \r\n" );
    log_printf( &logger, "- - - - - - - - - - - - -\r\n" );
    log_printf( &logger, "          3200 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_positive_voltage( &boostinv, BOOSTINV_VOLTAGE_POSITIVE_3200_mV );
    Delay_ms( 5000 );
    
    log_printf( &logger, "          7750 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_positive_voltage( &boostinv, BOOSTINV_VOLTAGE_POSITIVE_7750_mV );
    Delay_ms( 5000 );
    
    log_printf( &logger, "        12000 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_positive_voltage( &boostinv, BOOSTINV_VOLTAGE_POSITIVE_12000_mV );
    Delay_ms( 5000 );
    
    log_printf( &logger, "         7750 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_positive_voltage( &boostinv, BOOSTINV_VOLTAGE_POSITIVE_7750_mV );
    Delay_ms( 5000 );
    
    // Sets Negative output voltage
    
    log_printf( &logger, " Negative output voltage \r\n" );
    log_printf( &logger, "- - - - - - - - - - - - -\r\n" );
    log_printf( &logger, "        -1450 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_negative_voltage( &boostinv, BOOSTINV_VOLTAGE_NEGATIVE_1450_mV );
    Delay_ms( 5000 );
    
    log_printf( &logger, "       - 6700 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_negative_voltage( &boostinv, BOOSTINV_VOLTAGE_NEGATIVE_6700_mV );
    Delay_ms( 5000 );
    
    log_printf( &logger, "       - 11050 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_negative_voltage( &boostinv, BOOSTINV_VOLTAGE_NEGATIVE_11050_mV );
    Delay_ms( 5000 );
    
    log_printf( &logger, "       - 6700 mV\r\n" );
    log_printf( &logger, "-------------------------\r\n" );
    boostinv_set_negative_voltage( &boostinv, BOOSTINV_VOLTAGE_NEGATIVE_6700_mV );
    Delay_ms( 5000 );
}

void main ( void )
{
    application_init( );

    for ( ; ; )
    {
        application_task( );
    }
}


// ------------------------------------------------------------------------ END

Additional Support

Resources

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