Create USB management and charging solution with LTC3553 and ATmega328P
Recharge and thrive
Published Feb 14, 2024
Click board™
Charger 18 Click
Dev. board
Arduino UNO Rev3
Compiler
NECTO Studio
MCU
ATmega328P
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Hardware Overview
How does it work?
Charger 18 Click is based on the LTC3553, a micropower multifunction power management integrated circuit (PMIC) for portable Li-Ion/Polymer battery-based applications from Analog Devices. It combines a USB-compatible PowerPath manager with automatic load prioritization delivering up to 400mA battery charge current from a 5V USB input. The device’s ‘instant-on’ operation ensures immediate system load power when a USB supply is available, even with a fully discharged battery. Alongside a stand-alone battery charger, it has a high-efficiency synchronous 200mA buck regulator and a 150mA low dropout linear regulator available on the onboard connectors. This Click board™ has an input current limit selection allowing the user to select between 100mA and 500mA input current limit. The choice can be made by appropriately positioning the SMD jumper labeled ISET SEL. Besides ISET, it also possesses SEQ SEL jumper selection determining which regulator is enabled before the other. The first-regulator power-up selection is made by positioning this SMD jumper to an appropriate position
marked as BUCK or LDO. On the other hand, the BON and LDO pins routed to the AN and PWM pins on the mikroBUS™ socket enable the buck and LDO regulators by setting these pins to a high logic state. Alongside these pins, the LTC3553 also includes a pushbutton input to control the two regulators and system reset - an onboard pushbutton labeled ON, also routed to the RST pin on the mikroBUS™, representing the Regulator Ignition button. Pressing the button causes an STA interrupt, informing the MCU that this event has occurred. These regulators are also related to a Standby Mode, selectable through an SMD jumper labeled as ISET SEL. When this jumper is placed ON, the buck and the LDO regulator quiescent current is reduced to low levels while maintaining output voltage regulation. The buck regulator is limited to a 10mA maximum load current in this mode, and the LDO regulator’s response to line and load transients is slower. As already mentioned in the text, this Click board™ communicates with MCU using several GPIO pins. With the IEN pin routed to the CS pin on the
mikroBUS™ socket pulled high, the LTC3553 enters Suspend mode to comply with the USB specification. In this mode, the power path between USB and VOUT is put in a high impedance state to reduce the USB input current. This Click board™ also comes with a blue LED labeled CHARGING for the battery charging state. An NTC function is also available for temperature-qualified charging. The temperature monitoring feature is selectable via an NTC SEL jumper, where the user can choose between external or internal monitoring modes. A negative temperature coefficient (NTC) thermistor input for the battery temperature monitor is provided for the external mode. This Click board™ can only be operated with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used as a reference for further development.
Features overview
Development board
Arduino UNO is a versatile microcontroller board built around the ATmega328P chip. It offers extensive connectivity options for various projects, featuring 14 digital input/output pins, six of which are PWM-capable, along with six analog inputs. Its core components include a 16MHz ceramic resonator, a USB connection, a power jack, an
ICSP header, and a reset button, providing everything necessary to power and program the board. The Uno is ready to go, whether connected to a computer via USB or powered by an AC-to-DC adapter or battery. As the first USB Arduino board, it serves as the benchmark for the Arduino platform, with "Uno" symbolizing its status as the
first in a series. This name choice, meaning "one" in Italian, commemorates the launch of Arduino Software (IDE) 1.0. Initially introduced alongside version 1.0 of the Arduino Software (IDE), the Uno has since become the foundational model for subsequent Arduino releases, embodying the platform's evolution.
Microcontroller Overview
MCU Card / MCU
Architecture
AVR
MCU Memory (KB)
32
Silicon Vendor
Microchip
Pin count
28
RAM (Bytes)
2048
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Accessories
Click Shield for Arduino UNO has two proprietary mikroBUS™ sockets, allowing all the Click board™ devices to be interfaced with the Arduino UNO board without effort. The Arduino Uno, a microcontroller board based on the ATmega328P, provides an affordable and flexible way for users to try out new concepts and build prototypes with the ATmega328P microcontroller from various combinations of performance, power consumption, and features. The Arduino Uno has 14 digital input/output pins (of which six can be used as PWM outputs), six analog inputs, a 16 MHz ceramic resonator (CSTCE16M0V53-R0), a USB connection, a power jack, an ICSP header, and reset button. Most of the ATmega328P microcontroller pins are brought to the IO pins on the left and right edge of the board, which are then connected to two existing mikroBUS™ sockets. This Click Shield also has several switches that perform functions such as selecting the logic levels of analog signals on mikroBUS™ sockets and selecting logic voltage levels of the mikroBUS™ sockets themselves. Besides, the user is offered the possibility of using any Click board™ with the help of existing bidirectional level-shifting voltage translators, regardless of whether the Click board™ operates at a 3.3V or 5V logic voltage level. Once you connect the Arduino UNO board with our Click Shield for Arduino UNO, you can access hundreds of Click boards™, working with 3.3V or 5V logic voltage levels.
Li-Polymer Battery is the ideal solution for devices that demand a dependable and long-lasting power supply while emphasizing mobility. Its compatibility with mikromedia boards ensures easy integration without additional modifications. With a voltage output of 3.7V, the battery meets the standard requirements of many electronic devices. Additionally, boasting a capacity of 2000mAh, it can store a substantial amount of energy, providing sustained power for extended periods. This feature minimizes the need for frequent recharging or replacement. Overall, the Li-Polymer Battery is a reliable and autonomous power source, ideally suited for devices requiring a stable and enduring energy solution. You can find a more extensive choice of Li-Polymer batteries in our offer.
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 Arduino UNO Rev3 as your development board.
Track your results in real time
Application Output
1. Application Output - In Debug mode, the 'Application Output' window enables real-time data monitoring, offering direct insight into execution results. Ensure proper data display by configuring the environment correctly using the provided tutorial.
2. UART Terminal - Use the UART Terminal to monitor data transmission via a USB to UART converter, allowing direct communication between the Click board™ and your development system. Configure the baud rate and other serial settings according to your project's requirements to ensure proper functionality. For step-by-step setup instructions, refer to the provided tutorial.
3. Plot Output - The Plot feature offers a powerful way to visualize real-time sensor data, enabling trend analysis, debugging, and comparison of multiple data points. To set it up correctly, follow the provided tutorial, which includes a step-by-step example of using the Plot feature to display Click board™ readings. To use the Plot feature in your code, use the function: plot(*insert_graph_name*, variable_name);. This is a general format, and it is up to the user to replace 'insert_graph_name' with the actual graph name and 'variable_name' with the parameter to be displayed.
Software Support
Library Description
This library contains API for Charger 18 Click driver.
Key functions:
charger18_buck_controlThis function controls the buck regulator and enables the state of the Charger 18 Click board™.charger18_ldo_controlThis function controls the low dropout (LDO) regulator to enable the state of the Charger 18 Click board™.charger18_suspend_controlThis function controls the suspend charging mode state of the Charger 18 Click board™.
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 Charger 18 Click Example.
*
* # Description
* This example demonstrates the use of Charger 18 Click board by controlling
* the status of the charger as well as the LDO and BUCK regulators.
*
* The demo application is composed of two sections :
*
* ## Application Init
* Initializes the driver and enables the chip with the charger, LDO and BUCK regulators disabled.
*
* ## Application Task
* This function enables the charger, BUCK and LDO in the span of 25 seconds, and displays
* the status of each feature on the USB UART.
*
* @author Stefan Filipovic
*
*/
#include "board.h"
#include "log.h"
#include "charger18.h"
static charger18_t charger18; /**< Charger 18 Click driver object. */
static log_t logger; /**< Logger object. */
void application_init ( void )
{
log_cfg_t log_cfg; /**< Logger config object. */
charger18_cfg_t charger18_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.
charger18_cfg_setup( &charger18_cfg );
CHARGER18_MAP_MIKROBUS( charger18_cfg, MIKROBUS_1 );
if ( DIGITAL_OUT_UNSUPPORTED_PIN == charger18_init( &charger18, &charger18_cfg ) )
{
log_error( &logger, " Communication init." );
for ( ; ; );
}
charger18_power_control( &charger18, CHARGER18_CONTROL_ENABLE );
log_printf( &logger, " POWER : ON\r\n" );
charger18_suspend_control( &charger18, CHARGER18_CONTROL_ENABLE );
log_printf( &logger, " CHARGER : OFF\r\n" );
charger18_buck_control( &charger18, CHARGER18_CONTROL_DISABLE );
log_printf( &logger, " BUCK : OFF\r\n" );
charger18_ldo_control( &charger18, CHARGER18_CONTROL_DISABLE );
log_printf( &logger, " LDO : OFF\r\n" );
log_info( &logger, " Application Task " );
}
void application_task ( void )
{
charger18_suspend_control( &charger18, CHARGER18_CONTROL_DISABLE );
log_printf( &logger, " CHARGER : ON\r\n" );
// 10 seconds delay
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
charger18_suspend_control( &charger18, CHARGER18_CONTROL_ENABLE );
log_printf( &logger, " CHARGER : OFF\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
charger18_buck_control( &charger18, CHARGER18_CONTROL_ENABLE );
log_printf( &logger, " BUCK : ON\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
charger18_buck_control( &charger18, CHARGER18_CONTROL_DISABLE );
log_printf( &logger, " BUCK : OFF\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
charger18_ldo_control( &charger18, CHARGER18_CONTROL_ENABLE );
log_printf( &logger, " LDO : ON\r\n" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
charger18_ldo_control( &charger18, CHARGER18_CONTROL_DISABLE );
log_printf( &logger, " LDO : OFF\r\n\n" );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
Delay_ms ( 1000 );
}
int main ( void )
{
/* Do not remove this line or clock might not be set correctly. */
#ifdef PREINIT_SUPPORTED
preinit();
#endif
application_init( );
for ( ; ; )
{
application_task( );
}
return 0;
}
// ------------------------------------------------------------------------ END
Additional Support
Resources
Category:Battery charger
