1. Overview
1.1 Introduction
The UPD301C Basic Sink Application Example Evaluation Kit is a low-cost evaluation platform for Microchip’s UPD301C Standalone Programmable USB Power Delivery (PD) Controller. This RoHS-compliant evaluation platform comes in a small form factor and adheres to the USB Type-C™ Connector Specification and USB PD 3.0 specification.
Powered by Microchip's versatile USB Power Delivery Software Framework (PSF), this evaluation platform provides a quick and easy way of replacing the standard power connector (barrel plug) in any application with a small form factor, reversible Type-C connector. This bus-powered evaluation platform supports Dead Battery mode and can sink up to 100W from any standard USB PD power supply.
With the PSF stack, this platform supports up to six configurable Power Delivery Objects (PDOs), all of which are selectable through the onboard rotary switch. The platform can also support unique custom PDOs with the additional configuration of the PSF PD stack if required.
The UPD301C Basic Sink Application Example, powered by the PSF stack, reduces the overall time-to-market for a range of consumer and industrial applications by providing full control of the software to the end-user.
Some of the target application areas are:
- Point-of-Sale Terminals
- Charging Lockers
- IoT Products and Sensors
- Smart Speakers and Monitors
- Conference Systems
- Power Tools
The system block diagram of the Basic Sink Application Example is illustrated in Figure 1.
1.2 Kit Contents
The UPD301C Basic Sink Application Example Evaluation Kit includes:
- One UPD301C Basic Sink Application Example Board (EV11L78A)
1.3 Acronyms and Definitions
| Acronym | Definition |
|---|---|
| USB PD | USB Power Delivery |
| PSF | USB Power Delivery Software Framework |
| EVB | Evaluation Board |
| DFP | Downstream Facing Port |
| UFP | Upstream Facing Port |
| DAC | Digital to Analog Converter |
| Dead Battery | PD Sink/DRP mode use case in battery-powered applications where the UFP needs to derive power from VBUS for PD negotiation |
| Trace | Custom Debug mode over UART, can be used for data logging |
| PDO | Power Delivery Object, combination of voltage and current used broadcast the PD capabilities of the source/sink |
| RDO | Request Data Object, used by a Sink Port to negotiate a contact with a port partner |
| GPIO | General Purpose Input Output |
| SWD | Serial Wire Debug |
1.4 References
2 Getting Started
2.1 Quick Start
The UPD301C Basic Sink Application Example comes pre-programmed with the UPD301C_Basic_Sink_AE demo and is pre-configured in a single-port USB PD Sink mode. It can sink up to 100W (20V, 5A) out of the box and supports six configurations. For more information about these configurations, please refer to Section 2.2 Dynamic PDO Selection.
Following are the steps to get started with the UPD301C Basic Sink Application Example:
1
Rotate the PDO_SEL switch (SW1) to Position 1 to activate the sink application.
2
Plug a USB PD Source (e.g., Type-C Laptop power supply or phone charger) into the Type-C receptacle (J2) using a full-featured PD Type-C Cable. The board will power up and the PWR LED (D1) will turn on.
3
After powering up in a PD Sink mode, the board would negotiate a 5V PD contract with the PD source and the 5V LED (D2) will light up.
4
The negotiated voltage will be available on the PWR_OUT (J1) terminal block and can be used to power a load.
5
Rotating the PDO_SEL switch (SW1) further would result in a re-negotiation of the PD contract. For more information about the supported PDOs, please refer to Section 2.2 Dynamic PDO Selection.
| Reference Designator | Component Type | Label | Description |
|---|---|---|---|
| SW1 | Rotary Switch | PDO_SEL | PDO Selection Switch |
| J1 | 2-pin terminal block | PWR_OUT | Terminal block for negotiated voltage. Connects to external load (optional) |
| J2 | USB-C Receptacle | N/A | USB PD Sink-only port |
| J3 | 2x5 Header (1.27 mm) | DBG I/F | Atmel ICE Programming Interface |
| J4 | 2x3 Header (2.54 mm) | N/A | Debug/Status Interface |
The use of an external load attached to J1 is optional (not included)
| Reference Designator | Component Type | Label | Description |
|---|---|---|---|
| D1 | Green LED | PWR | 3V3 Board Power |
| D7 | Yellow LED | CAP MIS | Capabilities Mismatch |
| D8 | Green LED | EN SINK | Enable Sink status |
| Reference Designator | Component Type | Label | Description |
|---|---|---|---|
| TP13 | Test Point | CC2 | Type-C Configuration Channel 2 |
| TP14 | Test Point | CC1 | Type-C Configuration Channel 1 |
| TP15 | Test Point | DAC_I | DAC status output for negotiated current |
| TP16 | Test Point | FAULT_IN | Fault Status |
| TP17 | Test Point | ORIENT | Type-C Orientation status |
| TP18 | Test Point | 1.5A IND | 1.5A Current Indicator |
| TP19 | Test Point | 3.0A IND | 3A Current Indicator |
| TP20 | Test Point | PDO_SEL | PDO_SEL (SW1) switch voltage input to UPD301C |
| Reference Designator | Component Type | Label | Description |
|---|---|---|---|
| TP11 | Test Point | DP | UFP USB 2.0 Data Plus (D+) |
| TP12 | Test Point | DN | UFP USB 2.0 Data Minus (D-) |
2.2 Dynamic PDO Selection
Figure 5 shows the PDO_SEL switch (SW1) which enables the user to dynamically change the Sink PD contract. The PDO_SEL rotary switch has a total of seven positions and it supports six unique PD contract options as listed in the table.
| Switch 1 Position | PDO Select Voltage Value | Contract Voltage |
|---|---|---|
| 0 | 0.00V | Reserved. Do not use |
| 1 | 0.42V | 5V |
| 2 | 0.83V | 9V |
| 3 | 1.25V | 15V |
| 4 | 1.66V | 20V |
| 5 | 2.08V | Mode A: Highest Wattage at Highest Voltage |
| 6 | 2.50V | Mode B: Highest Wattage at Lowest Voltage |
| 7 | 0.00V | Reserved. Do not use |
Mode A and Mode B depend on the source capabilities offered.
The PDO associated with each position of the rotary switch can be changed by modifying the PSF PD stack or through the UART command terminal.
2.3 Voltage Meter LEDs
The LED Voltmeter provides a visual indication of the approximate VBUS voltage on the Type-C connector. The location of the voltmeter is shown in Figure 6.
| Reference Designator | Component Type | Label | Description |
|---|---|---|---|
| D2 | GREEN LED | 5V | 5V Sink PD Contract |
| D4 | YELLOW LED | 9V | 9V Sink PD Contract |
| D5 | ORANGE LED | 15V | 15V Sink PD Contract |
| D6 | RED LED | 20V | 20V Sink PD Contract |
When PDO_SEL (SW1) is set to position 1, the application would request a 5V, 3A PDO as seen in Figure 7.
When PDO_SEL (SW1) is set to position 2, the application would request a 9V, 3A PDO as seen in Figure 8. If the attached PD source cannot meet this requirement, then the application will try to establish a 5V, 3A contract, and the CAP_MIS (D7) LED will turn ON.
When PDO_SEL (SW1) is set to position 3, the application would request a 15V, 3A PDO as seen in Figure 9. If the attached PD source cannot meet this requirement, then the application will try to establish a 5V, 3A contract, and the CAP_MIS (D7) LED will turn ON.
When PDO_SEL (SW1) is set to position 4, the application would request a 20V, 3A PDO as seen in Figure 10. If the attached PD source cannot meet this requirement, then the application will try to establish a 5V, 3A contract, and the CAP_MIS (D7) LED will turn ON.
Results for PDO_SEL position 5 (Mode A) and position 6 (Mode B) may vary depending on the source capabilities offered by the port partner.
3 Advanced Features
3.1 Debug and Atmel ICE Program Headers
Figure 11 shows the locations of the Atmel ICE programming Interface (J3) and the Debug/Status Interface (J4).
Figure 12 shows the pinout of the Atmel ICE programming Interface (J3) and the Debug/Status Interface (J4).
3.2 Atmel ICE Programmer
The Atmel-ICE (sold separately) (shown in Figure 13) is a powerful development tool for programming and debugging the ARM® Cortex®-M based SAMD20 microcontroller within the UPD301C Type-C Standalone PD controller. The Atmel-ICE requires a software front-end like MPLAB X IDE or MPLAB X IPE installed on your computer.
3.3 Microchip's USB PSF
Microchip's USB PSF is a lightweight, full-featured USB PD 3.0 compliant software PD stack. The stack provides demos for various USB PD use cases which serve as a software starting point for your custom PD application.
PSF currently offers the following demo for the UPD301C Basic Sink Application Example :
| PSF Demo Name | Description |
|---|---|
| UPD301C_Basic_Sink_AE | Single port sink-only application example for UPD301C. Supports dynamic PDO configuration using a rotary switch and advanced control options through UART terminal |
All the software stack-related documentation and the source code can be accessed through the PSF GitHub repository linked below.
Download USB PSF
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