Intermediate
20 min

Experience the future of wireless charging with P9025AC and PIC32MX795F512L

Power up without wires - Qi-ready and hassle-free!

Qi Receiver Click with Fusion for PIC v8

Published Nov 02, 2023

Click board™

Qi Receiver Click

Development board

Fusion for PIC v8

Compiler

NECTO Studio

MCU

PIC32MX795F512L

Our Qi-compliant wireless power receiver empowers you to charge your devices with ease, making everyday life more convenient and clutter-free.

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Hardware Overview

How does it work?

Qi Receiver Click is based on the P9025AC, a compact Qi-compliant wireless power receiver ideal for many portable applications looking to take advantage of wireless charging technology from Renesas. This Click board™ utilizes the principles of inductive coupling for wireless power transfer. It uses P9025AC's integrated synchronous full-bridge rectifier and LDO output stage to convert the harvested wireless power signal from the Wurth Electronik's 760308103205 wireless power coil into a regulated 5.3V/1A output (unpopulated OUT header) suitable to charge a battery or power a system directly. Its operation automatically initiates WPC AC modulation communication protocols with optimal efficiency. In addition, it employs advanced Foreign Object Detection (FOD) techniques to safeguard the system. This Click board™ relies on the wireless power transfer standard, developed by the Wireless Power Consortium (WPC), to provide and monitor current and voltage. This standard involves digital communication to transmit the information to the charging pad. Depending on the received information packets, the charging pad regulates the variable magnetic field's strength, generating more or less power on the receiver coil. The P9025AC includes control

circuitry to transmit WPC-compliant message packets to the base station. When Qi Receiver Click is placed on a WPS Qi-compliant charging pad, it responds to the transmitter's "ping" signal by rectifying the AC power from the transmitter. During the "ping" phase, the rectifier provides about 5V, and an internal linear voltage regulator provides the supply voltage for the digital section of the P9025AC, enabling the Qi protocol communication so that the receiver can synchronize with the charging pad. After the initial synchronization, the system enters the Power Transfer state, and the actual power transfer process is started, monitored via the ST pin routed to the CS pin of the mikroBUS™ socket and indicated by the red Status LED indicator. Termination of the charging process is indicated by the END pin routed to the PWM pin of the mikroBUS™ socket. To simplify the Power-up and usage of the Qi Receiver Click board™, place the Qi Receiver Click with the inductive coil facing down toward the transmitter and verify that the STAT LED is illuminated, which means that the power is being transferred. After that, connect the load to the output pads. One special feature of this device is the possibility to detect foreign metal objects in the charging field, which can be heated

up by the eddy currents generated inside, with heat translated into a power loss. This state can be especially problematic if the object is a part of the power harvesting device. To overcome this problem, the P9025AC employs advanced Foreign Object Detection (FOD) techniques to safeguard the system, accurately measure its received power, and compensate for its known losses. Qi Receiver Click communicates with MCU using the standard I2C 2-Wire interface. The P9025AC can be enabled/disabled through the EN pin routed to the RST pin of the mikroBUS™ socket, hence offering a switch operation to turn ON/OFF power delivery to the chip. Overvoltage, overcurrent, and thermal shutdown features are also supported. Suppose any of these conditions occur on the output terminal. In that case, the LDO gets shut down, the charging pad stops transmitting the power, and the host MCU is notified of this situation via an interrupt signal. This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via SMD 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.

Qi Receiver Click hardware overview image

Features overview

Development board

Fusion for PIC v8 is a development board specially designed for the needs of rapid development of embedded applications. It supports a wide range of microcontrollers, such as different PIC, dsPIC, PIC24, and PIC32 MCUs regardless of their number of pins, and a broad set of unique functions, such as the first-ever embedded debugger/programmer over WiFi. The development board is well organized and designed so that the end-user has all the necessary elements, such as switches, buttons, indicators, connectors, and others, in one place. Thanks to innovative manufacturing technology, Fusion for PIC v8 provides a fluid and immersive working experience, allowing access anywhere and under any

circumstances at any time. Each part of the Fusion for PIC v8 development board contains the components necessary for the most efficient operation of the same board. In addition to the advanced integrated CODEGRIP programmer/debugger module, which offers many valuable programming/debugging options and seamless integration with the Mikroe software environment, the board also includes a clean and regulated power supply module for the development board. It can use a wide range of external power sources, including a battery, an external 12V power supply, and a power source via the USB Type-C (USB-C) connector. Communication options such as USB-UART, USB

HOST/DEVICE, CAN (on the MCU card, if supported), and Ethernet are also included, including the well-established mikroBUS™ standard, a standardized socket for the MCU card (SiBRAIN standard), and two display options (graphical and character-based LCD). Fusion for PIC v8 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.

Fusion for PIC v8 horizontal image

Microcontroller Overview

MCU Card / MCU

default

Type

8th Generation

Architecture

PIC32

MCU Memory (KB)

512

Silicon Vendor

Microchip

Pin count

100

RAM (Bytes)

131072

Used MCU Pins

mikroBUS™ mapper

Overtemperature
PB8
AN
Enable
PB0
RST
Charge Selection
PD7
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Charge Termination
PD1
PWM
Interrupt
PE8
INT
NC
NC
TX
NC
NC
RX
I2C Clock
PA2
SCL
I2C Data
PA3
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

Qi Receiver Click Schematic schematic

Step by step

Project assembly

Fusion for PIC v8 front image hardware assembly

Start by selecting your development board and Click board™. Begin with the Fusion for PIC v8 as your development board.

Fusion for PIC v8 front image hardware assembly
Buck 22 Click front image hardware assembly
SiBRAIN for PIC32MZ1024EFK144 front image hardware assembly
v8 SiBRAIN 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 Compiler Selection Step Image hardware assembly
NECTO Output Selection Step Image hardware assembly
Necto image step 6 hardware assembly
Necto image step 7 hardware assembly
Necto image step 8 hardware assembly
Necto image step 9 hardware assembly
Necto image step 10 hardware assembly
Necto PreFlash Image hardware assembly

Track your results in real time

Application Output

After pressing the "FLASH" button on the left-side panel, it is necessary to open the UART terminal to display the achieved results. By clicking on the Tools icon in the right-hand panel, multiple different functions are displayed, among which is the UART Terminal. Click on the offered "UART Terminal" icon.

UART Application Output Step 1

Once the UART terminal is opened, the window takes on a new form. At the top of the tab are two buttons, one for adjusting the parameters of the UART terminal and the other for connecting the UART terminal. The tab's lower part is reserved for displaying the achieved results. Before connecting, the terminal has a Disconnected status, indicating that the terminal is not yet active. Before connecting, it is necessary to check the set parameters of the UART terminal. Click on the "OPTIONS" button.

UART Application Output Step 2

In the newly opened UART Terminal Options field, we check if the terminal settings are correct, such as the set port and the Baud rate of UART communication. If the data is not displayed properly, it is possible that the Baud rate value is not set correctly and needs to be adjusted to 115200. If all the parameters are set correctly, click on "CONFIGURE".

UART Application Output Step 3

The next step is to click on the "CONNECT" button, after which the terminal status changes from Disconnected to Connected in green, and the data is displayed in the Received data field.

UART Application Output Step 4

Software Support

Library Description

This library contains API for Qi Receiver Click driver.

Key functions:

  • qireceiver_read_voltage - Function is used to measure current voltage in volt.

  • qireceiver_read_current - Function is used to measure current amperage in mA.

  • qireceiver_read_freq - Function is used to measure current frequency in hertz.

  • qireceiver_dev_enable - Function is used to enable the device.

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 QiReceiver Click example
 * 
 * # Description
 * This application reads voltage, current and frequency.
 *
 * The demo application is composed of two sections :
 * 
 * ## Application Init 
 *  Initalizes I2C driver, enables the device and makes an initial log.
 * 
 * ## Application Task  
 * This is an example that shows the most important
 * functions that Qi Receiver click has, it mesures current voltage, amperage and frequency.
 * 
 * ## Note
 * Click board needs to have external power ( Qi transmitter ) in order to work, otherwise I2C communication won't work.
 * If Qi Transmitter is removed from click board it will stop working, if you return it you should restart your application.
 * You will now when Click board has power and is ready to start application when red STAT led is on, when it's off I2C communication won't work.
 * 
 * \author MikroE Team
 *
 */
// ------------------------------------------------------------------- INCLUDES

#include "board.h"
#include "log.h"
#include "qireceiver.h"

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

static qireceiver_t qireceiver;
static log_t logger;

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

void application_init ( void )
{
    log_cfg_t log_cfg;
    qireceiver_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.

    qireceiver_cfg_setup( &cfg );
    QIRECEIVER_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    qireceiver_init( &qireceiver, &cfg );
    
    Delay_ms( 100 );
    qireceiver_dev_enable( &qireceiver );
    log_printf( &logger, "-----------------\r\n" );
    log_printf( &logger, "Qi Receiver Click\r\n" );
    log_printf( &logger, "-----------------\r\n" );
    Delay_ms( 100 );
}

void application_task ( void )
{
    float voltage;
    float current;
    float freq;
    
    voltage = qireceiver_read_voltage( &qireceiver );
    log_printf( &logger, "Voltage : %.2f V\r\n", voltage );

    current = qireceiver_read_current( &qireceiver );
    log_printf( &logger, "Current : %.2f mA\r\n", current );

    freq = qireceiver_read_freq( &qireceiver );
    log_printf( &logger, "Frequency : %.2f Hz\r\n", freq );
    
    log_printf( &logger, "-----------------\r\n" );
    Delay_ms( 1000 );
}

void main ( void )
{
    application_init( );

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


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

Additional Support

Resources