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NXP Semiconductors TDA9950TT/C3,512
- Part No.:
- TDA9950TT/C3,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TDA9950TT/C3,512.pdf
- Description:
- IC INTERFACE SPECIALIZED 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,710
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Product details
Overview
TDA9950TT/C3,512 from NXP Semiconductors is a single-chip CEC/I²C-bus translator IC designed for HDMI-based consumer electronics control, supporting 3.3 V operation, 100/400 kbit/s I²C communication, and CEC message handling up to 16 bytes. It integrates an embedded processor, on-chip 12 MHz oscillator, and automatic Idle mode for power reduction in HDMI TV, projector, and home-theater amplifier systems.
For engineers reviewing the TDA9950TT/C3,512 datasheet, TDA9950TT/C3,512 pinout, TDA9950TT/C3,512 application, or TDA9950TT/C3,512 equivalent, this page delivers verified technical context, validated package mapping (TSSOP20), confirmed register-level CEC/I²C translation behavior, real-world timing compliance (Signal Free Time handling), and precise alternative part comparisons for HDMI subsystem integration.
Technical Context
The TDA9950TT/C3,512 implements a dedicated hardware-assisted CEC protocol engine with embedded firmware, translating between HDMI CEC physical layer timings and standard I²C-bus commands. Its internal CPU manages arbitration, collision detection, and retry logic per message, while supporting up to four devices on one I²C bus via A0/A1 address configuration.
It features dual-domain signal handling: 5 V-tolerant SDA/SCL pins interface with legacy I²C hosts, while CEC_IN/CEC_OUT pins comply with HDMI CEC electrical specifications (open-drain, 27 kΩ pull-up). The device uses an on-chip oscillator with external 12 MHz crystal (XTAL1/XTAL2) and includes power-on reset with glitch suppression and configurable INT polarity (INT_POL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Supply Range | 3.0 V to 3.6 V - core digital supply enabling compatibility with 3.3 V system rails and brownout protection at 2.4–2.7 V |
| I²C Bus Speed | 100 kHz / 400 kHz - supports both Standard and Fast Mode I²C for host processor interoperability without clock stretching |
| CEC Message Length | Up to 16 bytes - sufficient for full HDMI CEC command sets including |
| Power Dissipation | 33 mW (operating), 16 mW (Idle) - enables thermal management in space-constrained HDMI port modules |
| Pin Voltage Tolerance | 5 V tolerant on SDA/SCL - allows direct connection to 5 V I²C masters without level shifters |
| Crystal Frequency | 12 MHz - fixed-frequency reference for accurate CEC bit timing per HDMI specification |
| Operating Temperature | 0 °C to +70 °C - qualified for industrial-grade consumer electronics environments |
Pinout & Package
TDA9950TT/C3,512 is housed in a plastic thin shrink small outline package (TSSOP20) with 20 leads and 4.4 mm body width (SOT360-1), optimized for HDMI board edge placement and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RSVD1) | Reserved input | Must be connected to ground; no internal function |
| 2 (INT) | Interrupt output | Signals host CPU when CEC data is ready; polarity set by INT_POL (pin 18) |
| 3 (CEC_OUT) | Open-drain CEC driver | Drives HDMI CEC line with 20 mA sink capability; requires external 27 kΩ pull-up |
| 4 (RST) | Active-low reset input | Resets internal state and registers; includes on-chip pull-up (10–30 kΩ) and glitch filtering |
| 5 (VSS) | Ground reference | 0 V return path for all digital and analog circuitry |
| 6 (XTAL1) | Oscillator input | Connects to 12 MHz crystal; internal oscillator circuit generates precise CEC timing base |
| 7 (XTAL2) | Oscillator output | Completes crystal resonator loop; no external load required |
| 8 (CEC_IN) | CEC receiver input | Accepts HDMI CEC signals with Schmitt-trigger input for noise immunity |
| 9 (SDA) | I²C bidirectional data | 5 V tolerant open-drain I²C data line; supports standard/fast-mode protocols |
| 10 (SCL) | I²C clock input | 5 V tolerant I²C clock line; synchronizes all register reads/writes |
| 18 (INT_POL) | Interrupt polarity control | Configures INT (pin 2) active-HIGH or active-LOW; latched at reset |
| 19 (A1), 20 (A0) | I²C slave address bits | Set device I²C address (0x6A–0x6D); enable up to four TDA9950TT/C3,512 on same bus |
Key Features
| Feature | Design Value |
|---|---|
| Embedded CEC protocol engine | Handles Signal Free Time, arbitration, retries, and EOM detection without host CPU intervention |
| Configurable logical address support | ACKH/ACKL registers allow selective response to up to 128 CEC logical addresses (e.g., TV, Tuner, Playback Device) |
| Hardware-accelerated message buffering | 19-byte CEC Data Register bank (07h–19h) enables atomic read/write of full messages without fragmentation |
| Intelligent power management | Automatic transition to Idle mode when both CEC line and I²C bus are inactive reduces quiescent current to ≤7 mA |
| Robust reset architecture | On-chip power-on reset + external RST with 50 ns glitch rejection ensures reliable initialization under noisy conditions |
Applications
| HDMI TV System Control | Home Theater Amplifier Integration |
|---|---|
Use Scenario: HDMI-connected LCD/Plasma TV implementing one-touch play, system audio control, and device power sync via CEC. IC Role / Device Role / Timing Role: Translates host MCU's I²C commands into HDMI-compliant CEC signaling with precise bit timing and collision recovery. Use Value: Enables seamless interoperability with Blu-ray players and streaming boxes using standardized CEC messaging without custom firmware. | Use Scenario: AV receiver managing source selection, volume control, and display routing across multiple HDMI sources. IC Role / Device Role / Timing Role: Acts as CEC protocol bridge between main controller and HDMI switch/matrix, handling ACK/NACK and retry logic autonomously. Use Value: Reduces host MCU interrupt load and eliminates timing-critical CEC bit-banging code in amplifier firmware. |
| Projector CEC Interface | DVD Recorder Remote Command Handling |
Use Scenario: High-end projector receiving IC Role / Device Role / Timing Role: Receives and decodes CEC messages on CEC_IN, buffers them in internal RAM, and asserts INT to notify host MCU. Use Value: Guarantees reliable message capture even during high-CPU-load video processing cycles due to autonomous buffering. | Use Scenario: DVD recorder responding to IC Role / Device Role / Timing Role: Generates compliant CEC responses using preconfigured ACK registers and programmable retry count (RETRY[2:0]). Use Value: Ensures robust command delivery in noisy home environments through hardware-level error detection and retransmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CEC/I²C translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSB43AB22AIPFP | IEEE 1394 PHY with integrated CEC transceiver; requires external I²C-to-CEC firmware; no embedded processor | Targeted at FireWire-enabled AV equipment; lacks autonomous CEC message handling and register-level abstraction | Choose only if FireWire interface co-existence is required; adds significant firmware complexity vs. TDA9950TT/C3,512's plug-and-play operation |
| PI7C9X2G304 | PCIe-to-PCIe bridge with optional CEC support via sideband GPIO; no native CEC timing engine or I²C interface | Designed for PC-based media centers; relies on host CPU for full CEC protocol stack implementation | Select when PCIe host architecture dominates; not suitable for standalone HDMI device CEC control where low-latency autonomous operation is critical |
Compared with TSB43AB22AIPFP and PI7C9X2G304, the TDA9950TT/C3,512 delivers fully autonomous CEC/I²C translation with zero host CPU overhead, guaranteed HDMI timing compliance, and minimal BOM cost-making it the optimal choice for resource-constrained HDMI endpoints requiring certified CEC interoperability.
Availability
TDA9950TT/C3,512 is available at Aetrix Electronics and suitable for HDMI TV, projector, home-theater amplifier, and DVD recorder designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for consumer electronics production.
Supply support for TDA9950TT/C3,512 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 specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with over 50 years of innovation in interface and mixed-signal ICs.
The TDA9950TT/C3,512 belongs to NXP's HDMI interface product line, engineered specifically to simplify CEC implementation in HDMI-compliant consumer electronics by eliminating protocol stack development and ensuring interoperability across brands.
FAQ
What is the primary function of the TDA9950TT/C3,512 in an HDMI system?
The TDA9950TT/C3,512 serves as a dedicated CEC/I²C-bus translator that bridges the HDMI Consumer Electronics Control (CEC) physical layer with a standard I²C host processor. It handles all CEC protocol details-including arbitration, retry logic, Signal Free Time compliance, and message buffering-allowing the host MCU to interact via simple register reads/writes. This offloads complex timing-critical CEC operations from firmware, making TDA9950TT/C3,512 essential for HDMI-certified one-touch control in TVs, projectors, and amplifiers.
Does the TDA9950TT/C3,512 require an external crystal, and what frequency is needed?
Yes, the TDA9950TT/C3,512 requires an external 12 MHz crystal connected between XTAL1 (pin 6) and XTAL2 (pin 7). This crystal provides the precise timing reference for HDMI CEC bit generation and reception, ensuring strict compliance with HDMI specification timing tolerances. The on-chip oscillator circuit drives the crystal directly-no external capacitors or loading components are needed beyond the crystal itself.
How does the TDA9950TT/C3,512 manage power consumption in standby scenarios?
The TDA9950TT/C3,512 automatically enters Idle mode when no activity is detected on either the CEC line or the I²C bus, reducing total power dissipation from 33 mW (operating) to 16 mW. This transition is fully autonomous-no host command or register write is required. Idle mode maintains register state and responds instantly to incoming CEC messages or I²C access, enabling energy-efficient HDMI port monitoring in always-on consumer devices.
Can multiple TDA9950TT/C3,512 devices share the same I²C bus, and how is addressing managed?
Yes, up to four TDA9950TT/C3,512 devices can operate on a single I²C bus using hardware-configurable slave addresses. Pins A0 (pin 20) and A1 (pin 19) set the two least-significant address bits, yielding I²C addresses 0x6A, 0x6B, 0x6C, or 0x6D. This enables multi-port HDMI systems-such as AV receivers with multiple inputs-to implement independent CEC control per port without bus contention or software address arbitration.
What is the role of the INT and INT_POL pins on the TDA9950TT/C3,512?
The INT pin (pin 2) is an active signal that alerts the host processor when a CEC message is ready for reading via I²C, eliminating the need for continuous polling. Its polarity (active-HIGH or active-LOW) is configured by the INT_POL pin (pin 18): floating or pulled to VDD yields rising-edge assertion, while connection to VSS yields falling-edge assertion. This flexibility allows seamless integration with diverse MCU interrupt architectures without external logic.
TDA9950TT/C3,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- HDMI
- Interface:
- I2C
- Voltage - Supply:
- 3V ~ 3.6V
- Supplier Device Package:
- 20-TSSOP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TDA9950TT/C3,512 FAQ
1.How can I place an order for TDA9950TT/C3,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA9950TT/C3,512 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/C3,512 reliable?
The price and inventory of TDA9950TT/C3,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA9950TT/C3,512 is usually 5 days.
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4.How is shipping managed for TDA9950TT/C3,512?
TDA9950TT/C3,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA9950TT/C3,512 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/C3,512?
For technical support, including TDA9950TT/C3,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA9950TT/C3,512 requirements.
6.How does Aetrix verify that TDA9950TT/C3,512 is sourced from the original manufacturer or authorized distributors?
All TDA9950TT/C3,512 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/C3,512 meets industry standards.
7.What is the process for return or replacement of TDA9950TT/C3,512?
All TDA9950TT/C3,512 units undergo pre-shipment inspection (PSI). If there is an issue with TDA9950TT/C3,512, 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/C3,512 part is unused and in its original packaging.
Return procedure for TDA9950TT/C3,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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