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Diodes Incorporated PI3USB9281GEEX
- Part No.:
- PI3USB9281GEEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Power Management - Specialized
- Package:
- 15-XFBGA, WLCSP
- Datasheet:
-
PI3USB9281GEEX.pdf
- Description:
- IC USB 2.0 PORT DETECT 15-CSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,229
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Product details
Overview
PI3USB9281 from Diodes Incorporated is a USB 2.0 port protection IC with integrated charger detection, USB On-The-Go (OTG) and Mobile HDMI Link (MHL) accessory identification, 1.7A over-current protection, 6.2–7.2V over-voltage protection, and I²C-programmable switch control. It operates from 3V to 5.5V supply and supports -40°C to +85°C ambient range in portable consumer devices.
For engineers reviewing the PI3USB9281 datasheet, PI3USB9281 pinout, PI3USB9281 application, or PI3USB9281 equivalent, key selection criteria include BC1.2-compliant DCP/CDP/SDP detection timing (≤200ms), VBUSIN tolerance up to 28V, 4.0pF USB switch capacitance, and I²C slave address 0x45 - all critical for USB-C dual-role port design in smartphones and tablets.
Technical Context
The PI3USB9281 implements a dual-path analog switch architecture: one path routes D+/D− signals between micro-USB connector and host transceiver (RON ≤ 3.1Ω, BW ≥ 1300MHz), while a second high-side power FET controls VBUSOUT (RONCHG ≤ 150mΩ, VOVP = 6.2–7.2V). Detection logic uses ID pin resistance thresholds (e.g., 1kΩ for OTG, 442kΩ for CEA-936 Car Kit Type 1) combined with D+/D− voltage sampling per BC1.2 and Apple charging protocols.
Interrupt-driven state reporting occurs via INTB (active-low CMOS) and CHG (open-drain) outputs, synchronized to I²C register updates (0x0A Device Type, 0x0E Charger Status). All detection events - including MHL, Samsung Fast Charge, and YD/T-1951 - are resolved within ≤130ms after VBUSIN valid, with no external components required for BC1.2 compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBUSIN Tolerance | Up to 28V - enables safe operation with USB 3.0 Power Delivery (20V max) without external clamping. |
| OCP Threshold | 1.5–1.9A - protects downstream USB ports against sustained short-circuit currents during charging. |
| OVP Threshold | 6.2–7.2V - latches off VBUSOUT if input exceeds safe Li-ion battery charging voltage. |
| USB Switch RON | ≤3.1Ω - maintains signal integrity for full-speed (480Mbps) USB 2.0 data with <30ps skew. |
| I²C Address | 0x45 (7-bit) - allows multi-device bus configuration without address conflict in smartphone baseband systems. |
| ID Pin Sensitivity | Detects 1kΩ (OTG), 200kΩ (MHL), 442kΩ (CEA-936 Car Kit Type 1) - eliminates need for external resistor networks. |
| Standby Current | ≤1µA - extends battery life in always-on USB accessory detection mode for mobile devices. |
Pinout & Package
PI3USB9281 is housed in a 15-ball CSP package (1.5mm × 2.0mm, 0.4mm pitch) optimized for space-constrained mobile PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DPH / DNH | USB Data Path Switch Output | Connects to host-side D+ and D− transceiver; enables/disables data path under I²C control. |
| D+ / D− | USB Connector Data Input | Direct interface to micro-USB receptacle; supports BC1.2 voltage-based charger classification. |
| ID | Accessory Identification Input | Senses pull-down resistance to GND for OTG/MHL/Car Kit detection without external biasing. |
| VBUSIN | Input Power Supply | Accepts up to 28V; feeds internal OVP circuit and charger FET gate driver. |
| VBUSOUT | Charger Output Power | Delivers regulated VBUS to external charger IC (e.g., BQ2419x) upon DCP/CDP detection. |
| CHG | Charger Detect Output | Open-drain active-low signal to notify charger IC of valid attachment (e.g., triggers fast-charge mode). |
| INTB | Interrupt Output | CMOS active-low interrupt to baseband processor indicating accessory change or OVP/OCP event. |
| ENB | Enable Input | Active-low enable; places device in low-power standby when deasserted. |
| SDA / SCL | I²C Interface | Standard-mode/fast-mode (400kHz) bidirectional communication for register read/write and configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BC1.2 & Apple Charging Detection | Eliminates need for discrete comparator networks and firmware polling - reduces BOM count by ≥4 passive components. |
| VBUSIN-Tolerant 28V Protection | Enables direct connection to USB PD sources without external TVS diodes or level shifters. |
| Programmable USB Switch Control | Allows dynamic reconfiguration of D+/D− routing via I²C registers (0x03, 0x13) for OTG role swapping. |
| CEA-936 Car Kit Compliance | Supports both Type 1 (442kΩ) and Type 2 (3MΩ) car chargers per ANSI/CEA-936-A specification. |
| Low-Leakage USB Signal Path | IOFF ≤ 10µA ensures minimal signal degradation and battery drain when switches are disabled. |
Applications
| Smartphone Charging Port Management | Tablet OTG Host Mode Enable |
|---|---|
Use Scenario: Dual-role USB port in Android smartphones supporting both charging and peripheral attachment. IC Role / Device Role / Timing Role: Acts as intelligent USB port manager detecting charger type (DCP/CDP/Apple/Samsung), enabling appropriate charge current and disabling data path during dedicated charging. Use Value: Reduces system-level firmware complexity by offloading BC1.2 and Apple protocol decoding to hardware with ≤200ms attach latency. |
Use Scenario: Tablet configured as USB host for keyboards, storage, or debug tools via micro-USB OTG cable. IC Role / Device Role / Timing Role: Identifies ID = GND condition and asserts INTB to trigger host-mode software stack; routes D+/D− to internal PHY. Use Value: Enables seamless OTG role switching without mechanical switches or user intervention, meeting USB-IF OTG compliance requirements. |
| MHL Audio/Video Docking | Automotive Infotainment Car Kit Interface |
Use Scenario: Smartphone connected to MHL-enabled display dock for HDMI video output. IC Role / Device Role / Timing Role: Detects 200kΩ ID-to-GND resistance and activates VBUSOUT to power MHL sink; isolates USB data lines to prevent interference. Use Value: Ensures reliable MHL link establishment while maintaining USB 2.0 compatibility on shared connector pins. |
Use Scenario: In-vehicle USB port supporting CEA-936 compliant car chargers and hands-free accessories. IC Role / Device Role / Timing Role: Discriminates between Car Kit Type 1 (442kΩ) and Type 2 (3MΩ) using ID pin, asserting CHG to initiate fast-charge or audio passthrough. Use Value: Delivers plug-and-play compatibility with certified automotive accessories without custom calibration or firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB port protection and charger detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TUSB211IRWBR | Lacks integrated charger detection; requires external BC1.2 IC or MCU firmware; no MHL/Car Kit support. | Used only for basic USB 2.0 signal switching with ESD protection - not suitable for smart charging systems. | Select when cost sensitivity outweighs charger intelligence needs and system MCU handles detection. |
| TPS65987D | USB-C PD controller with integrated policy engine; supports USB PD 3.0, but no BC1.2 or Apple legacy detection. | Targets USB-C ecosystems only; incompatible with micro-USB connectors and legacy chargers. | Choose for new USB-C designs requiring programmable power contracts, not for backward-compatible micro-USB ports. |
Compared with TUSB211IRWBR and TPS65987D, PI3USB9281 uniquely combines micro-USB physical layer compatibility, BC1.2/Apple/Samsung/CEA-936 detection in a single chip, and 28V VBUSIN tolerance - making it irreplaceable for cost-optimized, legacy-charger-supporting mobile designs.
Availability
PI3USB9281 is available at Aetrix Electronics and suitable for smartphone charging port management, tablet OTG host mode enable, MHL docking, and automotive infotainment car kit interface requiring stable component supply across high-volume production cycles.
Supply support for PI3USB9281 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for consumer, computing, communications, and industrial markets.
The PI3USB9281 belongs to Diodes' USB interface and protection product line, engineered specifically to simplify USB port intelligence in space-constrained mobile platforms while maintaining full BC1.2 and legacy charger interoperability.
FAQ
Does PI3USB9281 support USB 3.0 SuperSpeed data lines?
No. PI3USB9281 is designed exclusively for USB 2.0 full-speed (480Mbps) signal paths. Its D+/D− switch bandwidth is rated at 1300MHz, sufficient for USB 2.0 but not for USB 3.0's 5Gbps differential signaling. It does not connect to or manage USB 3.0 TX/RX pairs.
What is the minimum VBUSIN voltage required to initiate charger detection?
The PI3USB9281 requires VBUSIN ≥ 4.0V to begin charger detection and assert CHG/INTB. This threshold ensures reliable operation above standard USB 2.0 VBUS (4.4–5.25V) and avoids false triggers from noise or floating inputs.
Can PI3USB9281 be used with USB-C receptacles?
No. PI3USB9281 is pin-mapped for micro-USB connectors (ID, D+, D−, VBUSIN) and lacks CC pin handling, USB PD message parsing, or VCONN support required for USB-C. It is incompatible with USB-C physical layer requirements.
How does PI3USB9281 handle unknown USB accessories not listed in its detection table?
When an ID resistance falls outside defined ranges (e.g., non-standard OTG cables), PI3USB9281 reports "Unknown" via Device Type register (0x0A bit 6 = 1) and asserts INTB. The host processor then enables D+/D− switches to allow USB enumeration and protocol-level identification.
PI3USB9281GEEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 15-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Applications:
- Mobile Communications
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-CSP (1.5x2.0)
PI3USB9281GEEX FAQ
1.How can I place an order for PI3USB9281GEEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI3USB9281GEEX 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 PI3USB9281GEEX reliable?
The price and inventory of PI3USB9281GEEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI3USB9281GEEX is usually 5 days.
3.What payment methods are accepted for PI3USB9281GEEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI3USB9281GEEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI3USB9281GEEX?
PI3USB9281GEEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI3USB9281GEEX 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 PI3USB9281GEEX?
For technical support, including PI3USB9281GEEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI3USB9281GEEX requirements.
6.How does Aetrix verify that PI3USB9281GEEX is sourced from the original manufacturer or authorized distributors?
All PI3USB9281GEEX 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 PI3USB9281GEEX meets industry standards.
7.What is the process for return or replacement of PI3USB9281GEEX?
All PI3USB9281GEEX units undergo pre-shipment inspection (PSI). If there is an issue with PI3USB9281GEEX, 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 PI3USB9281GEEX part is unused and in its original packaging.
Return procedure for PI3USB9281GEEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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