USB-C Sink 2 Click

USB-C Sink 2 Click is a compact add-on board with a standalone autonomous USB power delivery controller. This board features the AP33772, a high-performance USB PD sink controller from Diodes Incorporated. It supports dead battery mode to allow a system to be powered from an external source directly, establishes a valid source-to-sink connection, and negotiates a USB power delivery (PD) contract with a PD-capable source device. It also supports a flexible PD3.0 and PPS for applications that require direct voltage and current requests, with fine-tuning capabilities.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : Jun 2023.
• Type : ADC/I2C type

Software Support

We provide a library for the USB-C Sink 2 Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for USB-C Sink 2 Click driver.

Standard key functions :

• usbcsink2_cfg_setup Config Object Initialization function.

  void usbcsink2_cfg_setup ( usbcsink2_cfg_t *cfg );

• usbcsink2_init Initialization function.

  err_t usbcsink2_init ( usbcsink2_t *ctx, usbcsink2_cfg_t *cfg );

• usbcsink2_default_cfg Click Default Configuration function.

  err_t usbcsink2_default_cfg ( usbcsink2_t *ctx );

Example key functions :

• usbcsink2_write_rdo USB-C Sink 2 write the RDO function.

  err_t usbcsink2_write_rdo ( usbcsink2_t *ctx, uint8_t *rdo );

• usbcsink2_get_pdo_voltage USB-C Sink 2 get the voltage function.

  err_t usbcsink2_get_pdo_voltage ( usbcsink2_t *ctx, float *voltage_mv );

• usbcsink2_get_pdo_current USB-C Sink 2 get the current function.

  err_t usbcsink2_get_pdo_current ( usbcsink2_t *ctx, float *current_ma );

Example Description

This example demonstrates the use of the USB-C Sink 2 Click board™ by setting DC power requests and control for Type-C connector-equipped devices (TCD).

The demo application is composed of two sections :

Application Init

Initializes I2C and ADC modules and log UART. After driver initialization the app set default settings.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    usbcsink2_cfg_t usbcsink2_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.
    usbcsink2_cfg_setup( &usbcsink2_cfg );
    USBCSINK2_MAP_MIKROBUS( usbcsink2_cfg, MIKROBUS_1 );
    err_t init_flag = usbcsink2_init( &usbcsink2, &usbcsink2_cfg );
    if ( ( ADC_ERROR == init_flag ) || ( I2C_MASTER_ERROR == init_flag ) )
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }

    if ( USBCSINK2_ERROR == usbcsink2_default_cfg ( &usbcsink2 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_info( &logger, " Application Task " );
    log_printf( &logger, "---------------------------\r\n" );
    Delay_ms ( 100 );
}

Application Task

In this example, the app configures Power Data Objects (PDO) highest priority profile and requests power from a standard USB PD source adapter. After connecting the PD source and USB-C Sink 2 Click with the Type-C cable, the app gets the total number of valid PDO's and switches all PDO configurations every 10 seconds. When the PD source accepts the request, the app displays information about VOUT Voltage [mV] and Current [mA] and the temperature [degree Celsius] of the USB-C connector.

void application_task ( void ) 
{
    static float voltage_mv = 0, current_ma = 0;
    static uint8_t temperature = 0;
    for ( uint8_t pdo_num = 0; pdo_num < usbcsink2.number_of_valid_pdo; pdo_num++ )
    {
        usbcsink2.pdo_data[ pdo_num * 4 + 3 ] = ( pdo_num + 1 ) << 4;
        if ( USBCSINK2_OK == usbcsink2_write_rdo( &usbcsink2, &usbcsink2.pdo_data[ pdo_num * 4 ] ) )
        {
            log_printf( &logger, " --- PDO[ %d ] ---\r\n", ( uint16_t ) pdo_num );
        }

        if ( USBCSINK2_OK == usbcsink2_wait_rdo_req_success( &usbcsink2 ) )
        {
            if ( USBCSINK2_OK == usbcsink2_get_pdo_voltage( &usbcsink2, &voltage_mv ) )
            {
                log_printf( &logger, " Voltage : %.2f mV\r\n", voltage_mv );
            }

            if ( USBCSINK2_OK == usbcsink2_get_pdo_current( &usbcsink2, &current_ma ) )
            {
                log_printf( &logger, " Current : %.2f mA\r\n", current_ma );
            }

            if ( USBCSINK2_OK == usbcsink2_get_temperature( &usbcsink2, &temperature ) )
            {
                log_printf( &logger, " Temperature : %d C\r\n", ( uint16_t ) temperature );
            }
            log_printf( &logger, "---------------------------\r\n" );
            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 );
        }
    }
}

Note

FAULT LED flickering notified of the system status:

• Charging: Breathing light (2 sec dimming), 1 cycle is 4 sec.
• Fully charged: Continuously lit Charging current < 500mA.
• Mismatch: 1s flicker Voltage or power mismatch. Non-PD power source, 1 cycle is 2sec.
• Fault: 300ms flicker OVP, 1 cycle is 600ms.

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.USBCSink2

Additional notes and informations

Depending on the development board you are using, you may need USB UART Click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.