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NXP Semiconductors TDA9950TT/C3,518
- Part No.:
- TDA9950TT/C3,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TDA9950TT/C3,518.pdf
- Description:
- IC INTERFACE SPECIALIZED 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
TDA9950TT/C3,518 from NXP Semiconductors is a single-chip CEC/I²C-bus translator IC designed for HDMI Consumer Electronics Control interface bridging. It operates from 3.0 V to 3.6 V, supports I²C-bus speeds up to 400 kbit/s, handles CEC messages up to 16 bytes, and features automatic Idle mode for power reduction in HDMI-CEC-enabled AV receivers and set-top boxes.
For engineers reviewing the TDA9950TT/C3,518 datasheet, TDA9950TT/C3,518 pinout, TDA9950TT/C3,518 application, or TDA9950TT/C3,518 equivalent, this device serves as a dedicated protocol translator between standard I²C-bus hosts and the HDMI CEC physical layer - requiring precise timing compliance, logical address configuration, and interrupt-driven message handling in consumer audio/video systems.
Technical Context
The TDA9950TT/C3,518 integrates an embedded processor with firmware to manage full CEC protocol stack translation, including arbitration, collision detection, Signal Free Time enforcement, and message buffering. Its internal 12 MHz oscillator drives timing-critical CEC signal generation and recovery without external clock components.
It implements a dual-interface architecture: I²C-bus slave (with hardware-configurable A0/A1 addressing) connects to host microcontrollers, while open-drain CEC_IN/CEC_OUT pins interface directly to the 1-wire HDMI CEC bus. The INT output signals message availability, with polarity selectable via INT_POL, enabling efficient host polling or interrupt-driven firmware design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 3.0 V to 3.6 V - Core digital supply compatible with 3.3 V system rails; brownout detection at 2.4–2.7 V ensures reliable reset behavior. |
| I²C Speed | Up to 400 kbit/s Fast Mode - Enables high-throughput register access and CEC data transfer without host timing bottlenecks. |
| CEC Message Length | Up to 16 bytes - Supports full HDMI CEC command sets including |
| Power Dissipation | 33 mW typical in operating mode; 16 mW in Idle - Reduces thermal load in space-constrained HDMI source/sink PCB layouts. |
| I/O Voltage Tolerance | 5 V tolerant on SDA/SCL - Allows direct interfacing with legacy 5 V microcontrollers without level-shifting circuitry. |
| Operating Temp | 0 °C to +70 °C - Qualified for industrial-grade consumer electronics environments including AV amplifiers and media players. |
| Crystal Support | 12 MHz crystal on XTAL1/XTAL2 - Provides stable, low-jitter timing reference essential for CEC bit timing compliance (±0.25% tolerance). |
Pinout & Package
TDA9950TT/C3,518 is housed in a 20-pin TSSOP package (SOT360-1), 4.4 mm body width, with exposed pad not electrically connected. Pin 1 index marked by notch; lead pitch 0.65 mm; RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RSVD1) | Reserved input | Must be tied to GND; unused internal function prevents floating node noise coupling. |
| 2 (INT) | Interrupt output | Active-HIGH or active-LOW per INT_POL setting; signals host when CEC message is ready in buffer. |
| 3 (CEC_OUT) | CEC bus driver | Open-drain output; requires external 27 kΩ pull-up to 3.3 V for HDMI CEC line compliance. |
| 4 (RST) | Reset input | Active-LOW with internal 10–30 kΩ pull-up; glitch suppression rejects <50 ns spikes for robust power-on sequencing. |
| 5 (VSS) | Ground | 0 V reference for all analog/digital circuits; must be low-impedance connection to minimize CEC signal distortion. |
| 6 (XTAL1) | Oscillator input | Drives internal 12 MHz crystal oscillator; requires 220 pF load capacitance for stable startup and jitter control. |
| 8 (CEC_IN) | CEC bus receiver | Schmitt-trigger input with hysteresis; recovers CEC logic levels from noisy HDMI cable runs. |
| 9 (SDA) | I²C data I/O | 5 V tolerant open-drain; interfaces directly to 3.3 V or 5 V I²C masters without level shifters. |
| 10 (SCL) | I²C clock input | 5 V tolerant; synchronizes register reads/writes and CEC data transfers with host controller. |
| 15 (VDD) | Power supply | 3.3 V core supply; decoupling capacitor (100 nF) required within 5 mm of pin for noise immunity. |
| 18 (INT_POL) | Interrupt polarity select | Configures INT output active state: tie to VSS for active-LOW, float or tie to VDD for active-HIGH. |
| 19 (A1), 20 (A0) | I²C address bits | Hardware-selectable slave address (0x65–0x68); enables up to four TDA9950 devices on same I²C bus. |
Key Features
| Feature | Design Value |
|---|---|
| CEC Protocol Compliance | Fully implements HDMI CEC 1.3a timing, arbitration, retry, and EOM handling - eliminates need for custom firmware CEC stack. |
| Integrated Oscillator | On-chip 12 MHz crystal oscillator reduces BOM count and PCB area versus external clock solutions. |
| Automatic Idle Mode | Enters low-power state when both CEC bus and I²C bus are idle - cuts current draw by >50% during standby. |
| Comprehensive Error Reporting | Dedicated CER register identifies watchdog resets, CEC overrun, and bit timing errors - accelerates field failure diagnostics. |
| Configurable Logical Addressing | ACKH/ACKL registers support multiple CEC logical addresses (e.g., TV, Tuner, Playback Device) - enables single IC to serve multi-role HDMI endpoints. |
Applications
| Home Theater Amplifier | HDMI Source Device |
|---|---|
|
Use Scenario: Integrated amplifier receives HDMI CEC commands (e.g., IC Role / Device Role / Timing Role: Translates I²C-based host MCU commands into compliant CEC physical-layer signaling with precise 0.25% bit timing. Use Value: Enables one-touch control of audio routing without external CEC transceiver ICs or timing-critical FPGA logic. |
Use Scenario: Blu-ray player sends IC Role / Device Role / Timing Role: Acts as CEC protocol engine - buffers outgoing messages, enforces Signal Free Time, and manages retries on arbitration loss. Use Value: Guarantees HDMI-CEC interoperability with certified TVs without host MCU real-time scheduling constraints. |
| Projector System | LCD/Plasma TV |
|
Use Scenario: Projector responds to IC Role / Device Role / Timing Role: Host MCU configures ACKH/ACKL to recognize projector logical address; TDA9950TT/C3,518 handles CEC message parsing and status reporting. Use Value: Offloads CEC state machine execution from main application processor, reducing firmware complexity and latency. |
Use Scenario: TV broadcasts IC Role / Device Role / Timing Role: Receives CEC broadcast on CEC_IN, stores payload in internal RAM, asserts INT to wake host MCU for processing. Use Value: Enables fast, deterministic response to HDMI topology changes without polling overhead or missed interrupts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CEC/I²C translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSB43AB22A | Dual-port IEEE 1394 PHY with optional CEC support; no integrated CEC protocol engine - requires external MCU firmware stack. | Targeted at FireWire-enabled AV equipment; lacks native CEC message buffering and automatic retry logic. | Select only if FireWire interface is primary requirement and CEC is secondary; adds firmware development burden. |
| CEC1001 | Standalone CEC transceiver (no I²C interface); requires external I²C-to-CEC bridge MCU or FPGA logic. | Used in legacy designs with discrete CEC PHY + custom controller; no register-level I²C abstraction layer. | Choose when redesigning for cost-sensitive, non-I²C host architectures; increases board area and validation effort. |
Compared with TSB43AB22A and CEC1001, the TDA9950TT/C3,518 delivers fully autonomous CEC protocol handling via integrated processor and register-mapped I²C interface - reducing host MCU firmware size by ~3.2 kB and eliminating timing-critical bit-banging code.
Availability
TDA9950TT/C3,518 is available at Aetrix Electronics and suitable for HDMI-equipped home theater amplifiers, Blu-ray players, projectors, and LCD/Plasma TVs requiring stable component supply across extended production lifecycles.
Supply support for TDA9950TT/C3,518 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and consumer markets, with deep expertise in interface and mixed-signal ICs.
The TDA9950TT/C3,518 belongs to NXP's HDMI interface product line, engineered specifically to simplify CEC implementation in HDMI source and sink devices - reducing time-to-market for certified consumer AV equipment.
FAQ
What is the primary function of the TDA9950TT/C3,518 in an HDMI system?
The TDA9950TT/C3,518 serves as a dedicated CEC/I²C-bus protocol translator, converting standard I²C register reads/writes from a host microcontroller into fully compliant HDMI Consumer Electronics Control signaling on the 1-wire CEC bus. It handles message buffering, arbitration, retry logic, and timing-critical Signal Free Time enforcement - enabling seamless one-touch control across HDMI-connected devices without host MCU firmware overhead. The TDA9950TT/C3,518 offloads the entire CEC protocol stack from the application processor.
Does the TDA9950TT/C3,518 require an external crystal oscillator?
Yes, the TDA9950TT/C3,518 requires a 12 MHz crystal connected between XTAL1 and XTAL2 pins to generate its internal timing reference. The datasheet specifies 220 pF load capacitance and recommends a fundamental-mode crystal with ±50 ppm stability for HDMI CEC bit timing compliance. No external oscillator IC is needed - the TDA9950TT/C3,518 integrates the oscillator amplifier and bias circuitry internally.
How does the TDA9950TT/C3,518 handle multiple CEC logical addresses?
The TDA9950TT/C3,518 supports multiple CEC logical addresses through programmable ACKH (Address ACK High) and ACKL (Address ACK Low) registers. Each bit corresponds to one of 16 possible CEC logical addresses (0–15); writing '1' to a bit enables acknowledgment and forwarding of messages targeting that address. This allows a single TDA9950TT/C3,518 to serve as TV, Tuner, and Playback Device simultaneously - a capability confirmed in Section 8.1 and Table 11–12 of the official datasheet.
What is the purpose of the INT and INT_POL pins on the TDA9950TT/C3,518?
The INT pin is an interrupt output that signals the host microcontroller when a CEC message is ready for reading via I²C. Its active polarity (HIGH or LOW) is configured by the INT_POL pin: connecting INT_POL to VSS yields active-LOW INT, while floating or tying to VDD yields active-HIGH. This flexibility allows direct compatibility with diverse host GPIO interrupt configurations without external inverters. The TDA9950TT/C3,518 status register also mirrors INT state for polling fallback.
Can the TDA9950TT/C3,518 operate with a 5 V I²C-bus master?
Yes, the TDA9950TT/C3,518 has 5 V tolerant SDA and SCL pins, allowing direct connection to 5 V I²C-bus masters without level-shifting circuitry. The device's VDD remains at 3.3 V (3.0–3.6 V range), but input thresholds on SDA/SCL are specified to accept 0.3VDD–5.5 V logic levels. This dual-voltage capability simplifies integration into mixed-voltage systems where legacy 5 V microcontrollers control modern 3.3 V HDMI subsystems.
TDA9950TT/C3,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- HDMI
- Interface:
- I2C
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 20-TSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TDA9950TT/C3,518 FAQ
1.How can I place an order for TDA9950TT/C3,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA9950TT/C3,518 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 TDA9950TT/C3,518 reliable?
The price and inventory of TDA9950TT/C3,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA9950TT/C3,518 is usually 5 days.
3.What payment methods are accepted for TDA9950TT/C3,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA9950TT/C3,518 transactions.
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4.How is shipping managed for TDA9950TT/C3,518?
TDA9950TT/C3,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA9950TT/C3,518 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 TDA9950TT/C3,518?
For technical support, including TDA9950TT/C3,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA9950TT/C3,518 requirements.
6.How does Aetrix verify that TDA9950TT/C3,518 is sourced from the original manufacturer or authorized distributors?
All TDA9950TT/C3,518 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 TDA9950TT/C3,518 meets industry standards.
7.What is the process for return or replacement of TDA9950TT/C3,518?
All TDA9950TT/C3,518 units undergo pre-shipment inspection (PSI). If there is an issue with TDA9950TT/C3,518, 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 TDA9950TT/C3,518 part is unused and in its original packaging.
Return procedure for TDA9950TT/C3,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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