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STMicroelectronics STOTG04EQTR
- Part No.:
- STOTG04EQTR
- Manufacturer:
- STMicroelectronics
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
STOTG04EQTR.pdf
- Description:
- IC TRANSCEIVER 1/1 24QFNEP
- Quantity:
- Payment:
- Shipping:
Inventory:21,391
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Product details
Overview
STOTG04EQTR from STMicroelectronics is a USB On-The-Go (OTG) full-speed transceiver providing complete PHY-layer functionality for dual-role USB devices. It integrates VBUS charge pump (35mA typical output), ID line detector, SRP/HNP protocol support, ±6kV ESD protection on USB pins, and configurable I²C interface. It operates across 1.6–3.6V digital supply and 2.7–5.5V analog supply, targeting battery-powered mobile peripherals.
For engineers reviewing the STOTG04EQTR datasheet, STOTG04EQTR pinout, STOTG04EQTR application, or STOTG04EQTR equivalent, key selection criteria include VBUS charge-pump capability, multi-mode configurability (USB/I²C/UART/Audio), low-power suspend mode (1µA), integrated pull-up/down resistors, and QFN24 package compatibility with space-constrained portable designs.
Technical Context
The STOTG04EQTR implements a fully configurable USB-OTG physical layer with independent control logic managing four operational modes via I²C registers. Its architecture includes a dual-capacitor charge pump (CAP1/CAP2), VBUS and session-valid comparators (VBUS_VLD = 4.40V, VSES_VLD = 0.8–2.0V), and an LDO voltage regulator (VTRM = 2.75V or 3.3V selectable).
It supports differential (D+/D−), single-ended (VP/VM), and bidirectional (DAT_VP/SE0_VM) signaling paths controlled by dat_se0, bidi_en, and speed bits. The driver features programmable impedance (8–24Ω), crossover voltage (1.3–2.0V), and rise/fall time matching (80–111% in low/full-speed modes), ensuring USB 2.0 compliance for both A- and B-device roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Speed Support | 12 Mbit/s full-speed and 1.5 Mbit/s low-speed - enables dual-speed interoperability with legacy and modern USB hosts/peripherals |
| VBUS Charge Pump Output | 35 mA typical at 3.3V supply - sufficient to power USB peripheral enumeration without external boost circuitry |
| ESD Protection | ±6 kV contact discharge on D+, D−, VBUS, ID - meets IEC 61000-4-2 Level 3 for robust field operation in handheld devices |
| Supply Voltage Ranges | +1.6V to +3.6V (VIF, digital); +2.7V to +5.5V (VBAT, analog) - supports wide-input Li-ion/Li-Po and regulated system rails |
| Power-Down Current | 1 µA - extends battery life in suspend state while retaining I²C accessibility and interrupt wake capability |
| Integrated Pull-Up Resistance | RPU_D+ = 900–1575 Ω (idle), RPU_D− = 900–1575 Ω - eliminates need for external 1.5kΩ resistors on D+ line for device enumeration |
| ID Line Detection | Distinguishes float (RID_FLOAT ≈ 800 kΩ), ground (RID_GND ≤ 10 Ω), and 140kΩ-biased states - enables automatic A/B role negotiation per OTG spec |
Pinout & Package
STOTG04EQTR is housed in a thermally enhanced QFN24 package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad (ExpPad, not connected electrically). The package supports reflow soldering and provides low thermal resistance (RthJA = 59°C/W) for sustained operation in compact portable enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ADR_PSW | I/O address bit / external charge pump enable | Latches LSB of I²C address at reset; drives external switch when higher VBUS current (>35mA) is required |
| 5 INT/ | Open-drain interrupt output | Signals ID change, VBUS status, or session events; requires external pull-up for host MCU edge detection |
| 8 SUSPEND | Hardware power-down input | Active-high assertion forces chip into 1µA sleep mode independent of register configuration |
| 15 D− / 16 D+ | USB differential data I/O | Full-speed/low-speed bidirectional bus lines; include internal 900–1575Ω pull-up on D+ for peripheral enumeration |
| 18 ID | USB role identification input | Detects floating, grounded, or resistor-biased state to determine A-device (host) or B-device (peripheral) role |
| 19 VBUS | USB bus voltage I/O | Monitors and supplies 4.4–5.25V to downstream port; integrates comparator for session valid (VSES_VLD) and VBUS valid (VBUS_VLD) |
| 21 CAP1 / 22 CAP2 | Charge pump capacitor terminals | Connect external 220nF ceramic capacitor; forms switched-capacitor doubler to generate VBUS from VBAT |
Key Features
| Feature | Design Value |
|---|---|
| Multi-protocol mode selection | Configurable via I²C to operate as USB transceiver, I²C bus extender, UART level shifter, or audio interface - reduces BOM count in converged portable SoCs |
| Integrated VBUS management | On-chip charge pump + VBUS/Session comparators eliminate discrete DC-DC and monitoring ICs for OTG host negotiation |
| SRP and HNP support | Hardware-accelerated Session Request Protocol and Host Negotiation Protocol handling - enables seamless role swap without firmware polling overhead |
| Low-power suspend with wake capability | 1µA quiescent current while maintaining I²C slave responsiveness and interrupt generation - ideal for always-on USB accessory detection |
| Single-ended and differential receiver flexibility | VP/VM outputs provide SE signaling for UART/I²C modes; RCV provides differential USB receive path - simplifies PCB routing in mixed-signal layouts |
Applications
| Mobile Phone USB Accessory Mode | MP3 Player OTG Host Mode |
|---|---|
|
Use Scenario: Smartphone acts as USB host to connect flash drives or keyboards using micro-AB receptacle. IC Role / Device Role / Timing Role: STOTG04EQTR serves as OTG PHY, detecting ID pin state, generating VBUS, and executing HNP to assume host role. Use Value: Enables dual-role operation without external VBUS switch or level translators; 35mA charge pump powers standard USB peripherals directly. |
Use Scenario: Portable MP3 player reads music files from USB mass storage device during playback. IC Role / Device Role / Timing Role: Provides full-speed USB 2.0 PHY layer with SRP initiation and session management for plug-and-play peripheral attachment. Use Value: Integrated pull-up resistors and 1µA suspend mode extend battery runtime between file transfers; ±6kV ESD protects against user-handling surges. |
| Digital Camera PC Connection | Printer USB Peripheral Mode |
|
Use Scenario: DSLR camera connects to laptop for direct photo transfer via USB cable. IC Role / Device Role / Timing Role: Functions as USB peripheral PHY, presenting device descriptor via D+/D−, managing VBUS detection, and responding to host requests. Use Value: Low-jitter differential driver (tR/tF = 4–20ns) ensures reliable high-speed data bursts; internal 1.5kΩ D+ pull-up satisfies USB enumeration timing. |
Use Scenario: Compact thermal printer receives print jobs from tablet via USB OTG cable. IC Role / Device Role / Timing Role: Acts as USB device endpoint with integrated VBUS regulation and ID line sensing for automatic peripheral/host fallback. Use Value: QFN24 footprint minimizes PCB area; 2.7–5.5V analog supply range accommodates unregulated battery inputs; ESD-hardened pins prevent field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB-OTG transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TUSB1210IRGET | Integrated 5V LDO (no external charge pump needed); no audio mode; 1.8–3.6V only supply range | Requires simpler power design but lacks analog supply flexibility (2.7–5.5V) and multi-mode versatility | Select when system uses fixed 3.3V rail and prioritizes simplified VBUS generation over multi-protocol configurability |
| ISP1301UK | Legacy Philips USB OTG transceiver; no I²C configurability; fixed USB-only operation; larger QFP48 package | Supports basic SRP/HNP but lacks UART/I²C/audio modes and modern ESD rating (±4kV vs ±6kV) | Consider only for drop-in replacement in legacy designs where footprint and feature set match existing layout |
Compared with TUSB1210IRGET and ISP1301UK, STOTG04EQTR uniquely combines wide analog supply range (2.7–5.5V), quad-mode configurability (USB/I²C/UART/Audio), and QFN24 compactness-making it optimal for next-generation battery-powered OTG peripherals requiring flexible signal routing and extended operating voltage margins.
Availability
STOTG04EQTR is available at Aetrix Electronics and suitable for mobile phones, digital cameras, MP3 players, and portable printers requiring stable component supply across automotive-temperature industrial programs and consumer electronics volume production.
Supply support for STOTG04EQTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
The STOTG04E belongs to ST's USB connectivity product line, engineered specifically for space- and power-constrained portable devices needing compliant, configurable OTG PHY functionality without external support components.
FAQ
What USB protocols and speeds does STOTG04EQTR support?
STOTG04EQTR supports USB 2.0 full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s) operation, plus On-The-Go supplemental protocols including Session Request Protocol (SRP) and Host Negotiation Protocol (HNP). It does not support high-speed (480 Mbit/s) or USB 3.x protocols. Speed selection is configurable via the SPEED pin or Control Register 1.
How is VBUS generated and monitored on STOTG04EQTR?
VBUS is generated internally using a switched-capacitor charge pump driven from VBAT, requiring external 220nF (CAP1–CAP2) and 4.7µF (VBUS decoupling) capacitors. Monitoring is performed by two dedicated comparators: VBUS_VLD triggers at 4.40V (valid), and VSES_VLD detects session presence at 0.8–2.0V. Both status signals are accessible via I²C registers and INT/ pin assertion.
Can STOTG04EQTR operate without an external microcontroller?
No - STOTG04EQTR requires an external host controller (e.g., ARM Cortex-M MCU) to configure its operating mode, speed, and power state via the I²C interface. It has no autonomous USB stack or firmware; all protocol decisions (e.g., HNP arbitration, SRP initiation) depend on register writes and interrupt-driven host firmware logic.
What are the thermal and packaging considerations for QFN24 layout?
The STOTG04EQTR QFN24 (4mm × 4mm) features an exposed thermal pad (ExpPad) that must be soldered to a solid copper pour connected to GND for optimal heat dissipation. Recommended PCB layout includes 9 thermal vias (0.3mm diameter) under the pad, connected to inner-layer ground planes. RthJA is 59°C/W; derating is required above 70°C ambient in sealed enclosures.
STOTG04EQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- USB 2.0
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- -
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 1.6V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN-EP (4x4)
STOTG04EQTR FAQ
1.How can I place an order for STOTG04EQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STOTG04EQTR 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 STOTG04EQTR reliable?
The price and inventory of STOTG04EQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STOTG04EQTR is usually 5 days.
3.What payment methods are accepted for STOTG04EQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STOTG04EQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STOTG04EQTR?
STOTG04EQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STOTG04EQTR 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 STOTG04EQTR?
For technical support, including STOTG04EQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STOTG04EQTR requirements.
6.How does Aetrix verify that STOTG04EQTR is sourced from the original manufacturer or authorized distributors?
All STOTG04EQTR 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 STOTG04EQTR meets industry standards.
7.What is the process for return or replacement of STOTG04EQTR?
All STOTG04EQTR units undergo pre-shipment inspection (PSI). If there is an issue with STOTG04EQTR, 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 STOTG04EQTR part is unused and in its original packaging.
Return procedure for STOTG04EQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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