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onsemi FUSB302UCX
- Part No.:
- FUSB302UCX
- Manufacturer:
- onsemi
- Category:
- Controllers
- Package:
- 9-UFBGA, WLCSP
- Datasheet:
-
FUSB302UCX.pdf
- Description:
- IC USB TYPE C CTLR PROGR 9WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,722
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Product details
Overview
FUSB302UCX from Fairchild Semiconductor is a programmable USB Type-C controller with integrated Power Delivery (PD) 2.0 v1.1 physical layer, supporting dual-role port (DRP), source (SRC), and sink (SNK) operation. It delivers autonomous DRP toggle, CC pin attach/detach/orientation detection, VCONN switching with 600–1000 mA OCP, and operates from 2.8 V to 5.5 V supply at -40°C to +85°C. It enables USB-C implementation in space-constrained portable devices requiring up to 100 W power negotiation.
For engineers reviewing the FUSB302UCX datasheet, pinout, applications, or equivalent options, key selection considerations include its 9-ball WLCSP package (1.215 mm × 1.260 mm, 0.4 mm pitch), 25 µA typical standby current, BMC PD packet handling via 48-byte TX/80-byte RX FIFOs, and I²C Fast Mode Plus interface up to 1 MHz.
Technical Context
The FUSB302UCX implements a full BMC (Biphase Mark Coding) physical layer for USB PD communication over CC pins, including automatic GoodCRC response, configurable retry logic (NRETRY), soft reset generation on CRC failure, and hard reset ordered set transmission. Its internal DAC and fixed-threshold comparators support precise CC voltage measurement (42 mV/step) and VBUS monitoring (420 mV/step) per USB Type-C 1.1 specification.
It integrates autonomous DRP toggle timing (tTOG1 = 30–60 ms, tTOG2 = 20–40 ms), programmable host current sourcing (80/180/330 µA), SNK pull-down resistance (4.6–5.6 kΩ), and VCONN switch with thermal shutdown (145°C) and hysteresis (10°C). All control and status registers are accessed exclusively via I²C slave interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VDD) | 2.8 V (functional min) to 5.5 V - supports direct connection to system 3.3 V or 5 V rails without LDO |
| Operating Temperature | -40°C to +85°C - qualified for consumer and industrial portable electronics environments |
| Standby Current (Itog) | 25 µA typical - enables battery-backed DRP detection during system sleep |
| CC Current Sourcing | 80/180/330 µA - configures USB-C default/1.5 A/3 A power roles per spec-defined thresholds |
| VCONN Switch OCP | 600–1000 mA - powers full-featured USB 3.1 cables while preventing thermal damage |
| I²C Interface | Fast Mode Plus, up to 1 MHz - allows high-speed register access without CPU polling overhead |
| PD FIFO Depth | 48-byte TX / 80-byte RX - buffers complete PD messages (e.g., SOP, SOP', SOP'') without host intervention |
Pinout & Package
Package: 9-Ball Wafer-Level Chip Scale Package (WLCSP), 1.215 mm × 1.260 mm, 0.4 mm pitch, top-through view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CC1 / CC2 | Config Channel I/O | Bidirectional BMC PD data path; used for attach/detach/orientation detection, Ra/Rd termination sensing, and accessory mode entry |
| VBUS | Input | OVP-protected input for VBUS presence detection (4.0–21.0 V range); triggers I_VBUSOK interrupt on valid threshold crossing |
| VDD | Power | Main supply input (2.8–5.5 V); powers all internal blocks including BMC PHY, DAC, comparators, and I²C interface |
| VCONN | Power Switch Output | Regulated output switched to CC1 or CC2 to power active USB-C cables; includes OCP and thermal shutdown |
| INT_N | Open-Drain Output | Active-low interrupt signaling CC state change (attach/detach), BMC activity (I_ACTIVITY), or PD event (I_CRC_CHK, I_RETRYFAIL) |
| SCL / SDA | I²C Interface | Standard I²C bus signals (SCL input, SDA open-drain I/O); enable full register read/write and FIFO access for PD messaging |
| GND | Ground | Reference return for all analog and digital circuits; must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous DRP Toggle | Hardware-controlled SRC/SNK role swap with configurable timing (tTOG1/tTOG2), eliminating software polling loops |
| Integrated VCONN Switch | On-chip 600–1000 mA OCP switch with thermal protection - removes need for external MOSFET and sense resistor |
| USB PD 2.0 v1.1 Compliance | Full BMC PHY with auto-GoodCRC, retry, soft/hard reset - reduces host firmware complexity for PD protocol stack |
| High-Accuracy CC Sensing | 6-bit DAC (42 mV/step) + fixed comparators - enables precise Ra/Rd identification and current capability detection per USB-C spec |
| Dead Battery Support | SNK mode functional with no VDD applied - allows charging initiation even when system battery is fully depleted |
Applications
| Smartphone Charging Port | Laptop Docking Interface |
|---|---|
|
Use Scenario: Dual-role USB-C port on smartphone enabling simultaneous charging and data/video output. IC Role / Device Role / Timing Role: FUSB302UCX detects cable orientation, negotiates 15–100 W PD power, and switches VCONN to enable DisplayPort Alt Mode. Use Value: Eliminates need for separate orientation-detection IC and discrete VCONN switch, reducing BOM count by ≥3 components. |
Use Scenario: Host-side USB-C receptacle on laptop docking station supporting multiple peripherals and power delivery. IC Role / Device Role / Timing Role: FUSB302UCX acts as SRC to negotiate up to 100 W to connected laptop while detecting accessory modes (Debug/ Audio). Use Value: Enables single-chip BMC PD handling for multi-role dock ports, avoiding external PD controller + level-shifter combinations. |
| USB-C Power Adapter | Mobile Dongle Hub |
|
Use Scenario: Compact wall charger implementing USB-C PD sink-to-source role reversal for bidirectional charging. IC Role / Device Role / Timing Role: FUSB302UCX operates as SNK to receive PD contract from device, then retransmits as SRC to downstream accessories. Use Value: Supports compact 28–100 W adapter designs with <1.6 mm² footprint and <30 µA quiescent current in standby. |
Use Scenario: Credit-card-sized dongle converting USB-C to HDMI/USB-A/SD card, powered solely from host port. IC Role / Device Role / Timing Role: FUSB302UCX functions as DRP to detect host attachment, enable VCONN for active cable, and manage PD negotiation. Use Value: Enables full-featured dongles with no external power source, leveraging VCONN power and BMC PD for seamless plug-and-play. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB Type-C controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STUSB4500QTR | Integrated BC1.2 charger detection; no autonomous DRP toggle; 16-pin QFN package | Preferred for legacy USB charging compatibility where BC1.2 detection is mandatory | Choose STUSB4500QTR if BC1.2 compliance is required and DRP autonomy is not needed |
| TUSB320LAIRTVR | Fixed SRC/SNK only (no DRP); no VCONN switch; 12-pin WQFN; lower PD feature set (no auto-retry/soft reset) | Targeted at cost-sensitive single-role applications like basic chargers or peripherals | Choose TUSB320LAIRTVR for non-DRP, non-VCONN use cases where minimal PD functionality suffices |
Compared with STUSB4500QTR and TUSB320LAIRTVR, the FUSB302UCX uniquely combines autonomous DRP toggle, integrated VCONN switching, and full USB PD 2.0 v1.1 BMC PHY in a 1.26 mm × 1.215 mm WLCSP - making it optimal for space-constrained dual-role portable devices requiring full PD feature parity.
Availability
FUSB302UCX is available at Aetrix Electronics and suitable for smartphones, laptops, and USB-C power adapters requiring stable component supply across high-volume production cycles.
Supply support for FUSB302UCX 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
Fairchild Semiconductor (acquired by ON Semiconductor in 2016) is a pioneer in power management and interface ICs, delivering high-performance analog and mixed-signal solutions since 1957.
The FUSB302UCX belongs to Fairchild's USB Type-C controller product line, engineered specifically for compact, low-power portable systems needing full USB-C 1.1 and PD 2.0 v1.1 compliance without external support components.
FAQ
What is the primary function of the FUSB302UCX in a USB-C design?
The FUSB302UCX serves as the dedicated USB Type-C configuration channel (CC) controller and BMC physical layer for Power Delivery. It handles attach/detach/orientation detection, DRP toggle, VCONN switching, and PD packet transmission/reception - enabling full USB-C 1.1 and PD 2.0 v1.1 compliance without external logic. The FUSB302UCX replaces discrete comparator, switch, and PD PHY circuitry in portable electronics.
Does the FUSB302UCX support dead battery operation, and how does it work?
Yes, the FUSB302UCX supports dead battery operation in SNK mode: when no voltage is applied to VDD, the chip remains functional as a sink using power drawn from the attached USB-C host's VBUS through internal charge pumps. This allows charging initiation even when the host system battery is fully depleted. The FUSB302UCX uses this capability to assert Rd termination and respond to PD requests before system power-up.
What package options exist for the FUSB302UCX, and is it pin-compatible with other variants?
The FUSB302UCX is exclusively offered in a 9-ball WLCSP (1.215 mm × 1.260 mm, 0.4 mm pitch). It is not pin-compatible with the FUSB302MPX (14-lead MLP, 2.5 mm × 2.5 mm), which has different pin count, layout, and ball/pad mapping. The FUSB302UCX pinout is defined in Figure 4 of the datasheet and validated for top-through view only - bottom-view routing requires separate mechanical documentation.
How does the FUSB302UCX handle USB Power Delivery retries and error recovery?
The FUSB302UCX implements hardware-assisted PD error recovery: when AUTO_RETRY is enabled, it automatically resends the last TX FIFO packet up to NRETRY times if no GoodCRC is received. If retries fail, it triggers I_RETRYFAIL and - if AUTO_SOFT_RESET is set - transmits a Soft Reset packet (MessageID=0). If that fails, and AUTO_HARD_RESET is enabled, it sends a Hard Reset ordered set (RESET1/RESET2). The FUSB302UCX manages all timing (tRetry, tHardReset) and CRC validation internally.
Can the FUSB302UCX be used without an external microcontroller?
No - the FUSB302UCX is a peripheral controller requiring an external host processor for full operation. It provides no embedded firmware or autonomous decision-making beyond DRP toggle timing and BMC PHY functions. All policy decisions (e.g., PD contract negotiation, role assignment, accessory mode entry) must be implemented in host software via I²C register reads/writes and interrupt handling. The FUSB302UCX does not contain a CPU, flash, or boot ROM.
FUSB302UCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 9-UFBGA, WLCSP
- Programmable:
- Not Verified
- Protocol:
- USB
- Function:
- Controller
- Interface:
- USB
- Standards:
- USB 3.1
- Voltage - Supply:
- 2.8V ~ 5.5V
- Current - Supply:
- 25µA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 9-WLCSP (1.22x1.22)
- Grade:
- -
- Qualification:
- -
FUSB302UCX FAQ
1.How can I place an order for FUSB302UCX through Aetrix?
Please submit a Request for Quotation (RFQ) for FUSB302UCX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for FUSB302UCX reliable?
The price and inventory of FUSB302UCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FUSB302UCX is usually 5 days.
3.What payment methods are accepted for FUSB302UCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FUSB302UCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FUSB302UCX?
FUSB302UCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FUSB302UCX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for FUSB302UCX?
For technical support, including FUSB302UCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FUSB302UCX requirements.
6.How does Aetrix verify that FUSB302UCX is sourced from the original manufacturer or authorized distributors?
All FUSB302UCX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that FUSB302UCX meets industry standards.
7.What is the process for return or replacement of FUSB302UCX?
All FUSB302UCX units undergo pre-shipment inspection (PSI). If there is an issue with FUSB302UCX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The FUSB302UCX part is unused and in its original packaging.
Return procedure for FUSB302UCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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