onsemi FUSB302B01MPX

Overview

FUSB302B01MPX from onsemi is a USB Type-C port controller IC implementing BMC physical layer, CC detection, DRP toggle logic, VCONN switching, and USB Power Delivery 2.0 protocol engine. It supports 100 W power delivery, dual-role port (DRP) operation, and operates across −40°C to +85°C. Used in smartphones, laptops, and portable chargers for USB-C port negotiation and power role management.

For engineers reviewing the FUSB302B01MPX datasheet, pinout, applications, or equivalent options, key selection criteria include its I²C-configurable DRP behavior, integrated 48-byte Tx/Rx FIFO for PD messaging, programmable VCONN current limit (600–1000 mA), BMC timing compliance per USB PD 2.0, and support for USB Type-C 1.2 specification including audio/debug accessory detection.

Technical Context

The FUSB302B01MPX implements a full BMC physical layer with 4B5B encoding/decoding, CRC32 generation/checking, and automatic GoodCRC response when AUTO_CRC is enabled. Its dual CC channel interface supports real-time orientation detection, Ra/Rd termination sensing, and VBUS presence monitoring via internal DAC-based comparators.

It integrates a configurable DRP state machine with toggle timing (tTOG1 = 30–60 ms, tTOG2 = 20–40 ms), hardware-assisted PD packet retries, soft/hard reset handling, and interrupt-driven status reporting (I_VBUSOK, I_COMP, I_TOGDONE). The device uses I²C (up to 1 MHz Fast Mode Plus) for register access and policy engine coordination with host processor.

Key Specifications

Pinout & Package

Package: 14-lead MLP (2.5 mm × 2.5 mm, 0.5 mm pitch), Case 510BR, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB Type-C port controller applications.

Compared with STUSB4500QTR and TUSB320LAIRWTR, the FUSB302B01MPX delivers full USB PD 2.0 offload with integrated BMC PHY, 48/80-byte FIFOs, and on-die VCONN switch - reducing firmware overhead and PCB area while maintaining compatibility with USB Type-C 1.2 systems.

Availability

FUSB302B01MPX is available at Aetrix Electronics and suitable for smartphone charging ports, laptop docking stations, and portable power banks requiring stable component supply, industrial temperature range operation, and USB-C certification readiness.

Supply support for FUSB302B01MPX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi is a global semiconductor leader delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The FUSB302B01MPX belongs to onsemi's USB Type-C port controller product line, designed specifically to simplify USB-C implementation in space-constrained, high-reliability consumer and computing devices with minimal host processor involvement.

FAQ

What is the I²C slave address of the FUSB302B01MPX?

The FUSB302B01MPX has a fixed 7-bit I²C slave address of 0x46 (binary 01000110), as defined in Table 15 of the datasheet. This differs from base FUSB302BMPX (0x44) and other variants to enable multi-device I²C bus configurations without address conflict. All register reads/writes to the FUSB302B01MPX must use this address.

Does the FUSB302B01MPX support USB PD 3.0 or PPS?

No, the FUSB302B01MPX implements USB PD 2.0 only and does not support Programmable Power Supply (PPS) or extended message sets introduced in PD 3.0. Its BMC PHY, FIFO structure, and register set are optimized for PD 2.0 compliance, including SOP, SOP', SOP'', and Hard Reset sequences - but not PPS voltage stepping or Fast Role Swap.

How does the FUSB302B01MPX handle VCONN power delivery to USB-C cables?

The FUSB302B01MPX integrates a VCONN power switch that delivers regulated current to either CC1 or CC2 based on cable orientation detection. It features over-current protection (600–1000 mA), thermal shutdown at 145°C, and soft-start (1.5 ms). The switch is controlled via VCONN_CC1/VCONN_CC2 bits in Switches0 register (0x02), eliminating need for external components.

What is the function of the TOGGLE bit in Control2 register (0x08) for the FUSB302B01MPX?

The TOGGLE bit (bit 0) in Control2 register configures the FUSB302B01MPX for automatic DRP role swapping. When set to '1', it initiates a hardware-controlled sequence: first presents as SNK (tTOG1 = 30–60 ms), then as SRC (tTOG2 = 20–40 ms). This eliminates software polling and ensures deterministic USB-C port role negotiation per specification.

Can the FUSB302B01MPX operate without an external microcontroller?

No - the FUSB302B01MPX requires an external host processor for initialization, interrupt handling, and PD policy decisions. While it offloads BMC PHY, timing-critical PD packet transmission/reception, and CC detection, all register configuration (e.g., HOST_CUR, POWERROLE, SPECREV), interrupt clearing, and FIFO management must be performed via I²C by the host MCU.