Why can this DRP solution be both simple and inexpensive, despite also being PD certified?

Background of the Solution:

When customers use ICs based on ASIC solutions for PD certification testing, failures often occur during protocol compliance tests, which are time-consuming and labor-intensive. Common causes include:

1. Frequent updates to test specifications

2. Susceptibility to VBUS MOS control timing issues

3. Delayed status inquiries and system power control timing problems

4. Complexity of the PD protocol, which can easily lead to chip misconfiguration during operation

Advantages of This Solution:

1. Adaptability to Protocol Updates: Firmware can be updated to accommodate specification changes

2. HUSB252 Uses NMOS Drive: High customer acceptance with low BOM costs

3. User-Friendly Interface: Simple and easy to operate, minimizing the risk of customer errors

   

   Figure 1: Overall Block Diagram of the HUSB252 Certification Solution

A simplified version of the HUSB252 certification-compliant solution, designed to reduce user involvement. The overall functionality of the solution is described as follows:

It supports DRP functionality (Sink: 5V/3A to 20V/5A, Source: 5V/3A).

The solution can complete full PD certification testing without MCU intervention once an external 5V power supply is connected.

HUSB252 does not control the system power; system power control is delegated to the MCU.

HUSB252 can independently control the switching of back-to-back N-MOSFETs.

As an I2C Slave, HUSB252 provides an I2C interface (SCL/SDA/INT) to offer a status query interface for the MCU.

Registers accessible to users allow querying of commonly used application information, such as:

The block diagram of the HUSB252 demo is as follows. It does not include the MCU or charger, can automatically run after being connected to an external 5V power supply, and is capable of completing PD certification tests.

Figure 2: HUSB252 Demo Block Diagram

Figure 3: HUSB252 Demo Board