HOW DOES IT WORK?

USB-C Sink 3 Click is based on the AP33771, a high-performance USB PD sink controller from Diodes Incorporated. It supports up to eight voltage selections alongside ten different power ranges selection. In addition to selected voltages, both fixed PDO and PPS APDO in the PD source adapter are supported in the AP33771 search algorithm. The PD controller supports OVP with auto-restart, one-time programming (OTP) ROM for main firmware, and power capability selection. The onboard FAULT LED serves as a visual presentation of the negotiation mismatch.

USB-C Sink 3 Click is equipped with a VSINK, an external power supply terminal that comes with a pair of MOSFETs, according to the AP33771's driver for N-MOS VBUS power switch support. The PD controller can control the external NMOS switch ON or OFF. 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 USB-C Sink 3 Click comes with a VSEL three 2-position jumpers labeled 0, 1, and 2 to select the desired target voltage. There are I/O and FIX(ed) sides which allow you to choose between hardware and software target voltage selection in eight positions and a target voltage range from 5V up to 17.2V. The VSEL is set to I/O by default, where you can set logic states to the three IO pins over the TCA9536, a remote 4-bit I2C, and SMBus I/O expander with configuration registers from Texas Instruments. The table of the combination of the positions and the resulting target voltages is printed at the bottom of the Click board™. You can use fixed jumper positions by setting the jumpers as you like, where I/O acts as a 0 and 3V3 as a 1 position. The 5V and 3.3V LDO voltage output can be measured over the V5V and V3V pads, and voltage feedback over the VFB pad.

To select the desired power, there is the MCP41100T, a digital potentiometer with an SPI interface from Microchip. By selecting the corresponding resistance value on the digital potentiometer, you can choose one of the current capabilities ranging from 12W to 100W. The table with the expected resistance and the resulting current is printed at the bottom of the Click board™. In addition, you can solder a standard resistor by soldering it on RES resistor pads. For that purpose, you should set the PSEL jumper to a RES position, as it is set to a POT position by default.

USB-C Sink 3 Click uses a standard 2-Wire I2C interface of the MCP41100T to communicate with the host MCU. One of the main features of the USB-C Sink 3 Click is the ability to track the VBUS voltage over the AN pin of the mikroBUS™ socket.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. Also, it comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

SPECIFICATIONS