Intermediate
20 min

Experience the future of wireless charging with P9025AC and PIC32MZ1024EFH064

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

Qi Receiver Click with PIC32MZ clicker

Published Nov 02, 2023

Click board™

Qi Receiver Click

Dev Board

PIC32MZ clicker

Compiler

NECTO Studio

MCU

PIC32MZ1024EFH064

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

PIC32MZ Clicker is a compact starter development board that brings the flexibility of add-on Click boards™ to your favorite microcontroller, making it a perfect starter kit for implementing your ideas. It comes with an onboard 32-bit PIC32MZ microcontroller with FPU from Microchip, a USB connector, LED indicators, buttons, a mikroProg connector, and a header for interfacing with external electronics. Thanks to its compact design with clear and easy-recognizable silkscreen markings, it provides a fluid and immersive working experience, allowing access anywhere and under

any circumstances. Each part of the PIC32MZ Clicker development kit contains the components necessary for the most efficient operation of the same board. In addition to the possibility of choosing the PIC32MZ Clicker programming method, using USB HID mikroBootloader, or through an external mikroProg connector for PIC, dsPIC, or PIC32 programmer, the Clicker board also includes a clean and regulated power supply module for the development kit. The USB Micro-B connection can provide up to 500mA of current, which is more than enough to operate all onboard

and additional modules. All communication methods that mikroBUS™ itself supports are on this board, including the well-established mikroBUS™ socket, reset button, and several buttons and LED indicators. PIC32MZ Clicker is an integral part of the Mikroe ecosystem, allowing you to create a new application in minutes. Natively supported by Mikroe software tools, it covers many aspects of prototyping thanks to a considerable number of different Click boards™ (over a thousand boards), the number of which is growing every day.

PIC32MZ clicker double side image

Microcontroller Overview

MCU Card / MCU

default

Architecture

PIC32

MCU Memory (KB)

1024

Silicon Vendor

Microchip

Pin count

64

RAM (Bytes)

524288

Used MCU Pins

mikroBUS™ mapper

Overtemperature
RE4
AN
Enable
RE5
RST
Charge Selection
RG9
CS
NC
NC
SCK
NC
NC
MISO
NC
NC
MOSI
Power Supply
3.3V
3.3V
Ground
GND
GND
Charge Termination
RB3
PWM
Interrupt
RB5
INT
NC
NC
TX
NC
NC
RX
I2C Clock
RD10
SCL
I2C Data
RD9
SDA
Power Supply
5V
5V
Ground
GND
GND
1

Take a closer look

Schematic

Qi Receiver Click Schematic schematic

Step by step

Project assembly

PIC32MZ clicker front image hardware assembly

Start by selecting your development board and Click board™. Begin with the PIC32MZ clicker as your development board.

PIC32MZ clicker front image hardware assembly
Thermo 26 Click front image hardware assembly
Prog-cut hardware assembly
Micro B Connector clicker - 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
Flip&Click PIC32MZ 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 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

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