USB-C Sink 2 Click

How does it work?

USB-C Sink 2 Click is based on the AP33772, a high-performance USB PD sink controller from Diodes Incorporated. The host MCU can control the PPS with 20mV/step voltage and 50mA/step current. The PD controller supports overtemperature protection (OTP), OVP with auto-restart, OCP with auto-restart, one-time programming (OTP), power-saving mode, and a system monitor and control status register. For OTP, this Click board™ comes with an NTC temperature sensor, with selectable temperature points (25°C, 50°C, 75°C, 100°C) as a temperature threshold. The onboard FAULT LED serves as a visual presentation of the negotiation mismatch. The Multi-time programming (MTP) is reserved for future configuration.

This USB Type-C power delivery sink controller requires power from a standard USB source adapter, in our case from the USB connector labeled USB-C PD-IN, and then delivers power to connected devices on the VSINK connector. Between USB and VSINK terminal stands a pair of MOSFETs, according to the AP33772’s driver for N-MOS VBUS power switch support. The PD controller can control the external NMOS switch ON or OFF (all control is done via the I2C interface). The USB C connector acts as a PD-IN discharge path terminal with a USB Type-C configuration channels 1 and 2. The presence of the power supply on the USB C is indicated over the VBUS LED.

The AP33772 is equipped with several GPIOs. The user-configurable GPIO1 and GPIO2 are available on the side header labeled GP1, and GP2, with additional GND. Also, this Click board™ has several test pads for testing purposes. The 5V and 3.3V LDO voltage output can be measured over the V5V and V3V pads, and voltage feedback over the VFB pad.

USB-C Sink 2 Click uses a standard 2-Wire I2C interface to communicate with the host MCU. The interrupts from AP33772 can be monitored over the INT pin. One of the additional features of the USB-C Sink 2 Click is the ability to track the VBUS voltage over the AN pin of the mikroBUS™ socket.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL 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.

Specifications

Pinout diagram

This table shows how the pinout on USB-C Sink 2 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Input	AN	1	AN	PWM	16	NC
	NC	2	RST	INT	15	INT	Interrupt
	NC	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

USB-C Sink 2 Click electrical specifications

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), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

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

Key functions

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

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

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

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).

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 ] ---rn", ( 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 mVrn", voltage_mv ); 
             } 

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

             if ( USBCSINK2_OK == usbcsink2_get_temperature( &usbcsink2, &temperature ) ) 
             { 
                 log_printf( &logger, " Temperature : %d Crn", ( uint16_t ) temperature ); 
             } 
             log_printf( &logger, "---------------------------rn" ); 
             Delay_ms( 10000 ); 
         } 
     } 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), 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.

mikroSDK

This Click board™ is supported with mikroSDK – MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.

For more information about mikroSDK, visit the official page.