STMicroelectronics HDMI2C1-6C1

Overview

HDMI2C1-6C1 from STMicroelectronics is an integrated ESD protection and signal conditioning IC for HDMI 1.4 source control interfaces, providing bidirectional DDC (I²C) level-shifting with dynamic pull-up, CEC wake-up capable level-shifting, HEAC/HPD line management, and 5V output short-circuit/over-temperature protection. It operates from –40 °C to +85 °C and supports ASIC supply voltages down to 1.8 V.

For engineers reviewing the HDMI2C1-6C1 datasheet, HDMI2C1-6C1 pinout, HDMI2C1-6C1 application, or HDMI2C1-6C1 equivalent, this device addresses HDMI CTS compliance challenges in consumer electronics - especially where long cable support, ultra-low standby power (<0.8 mW), robust ESD immunity (±8 kV contact), and independent CEC wake-up capability are critical selection criteria.

Technical Context

The HDMI2C1-6C1 implements three functionally isolated signal-conditioning blocks: a DDC buffer with synchronized dynamic pull-up enabling I²C rise-time compliance up to 750 pF load capacitance; a CEC block featuring backdrive protection, UVLO, and autonomous operation under VDD_CEC-only supply; and a combined HPD/HEAC utility block with current-source HPD pull-down and differential HEAC+/- outputs.

Its 5V_OUT stage integrates a low-dropout current limiter (typ. 50 mV drop at 55 mA), thermal shutdown (120–150 °C), and fault reporting via open-drain FAULT pin. All protected lines (SCL, SDA, CEC, HPD, 5V_OUT, HEAC±, UTILITY) meet IEC 61000-4-2 Level 4 (±8 kV contact).

Key Specifications

Pinout & Package

Delivered in a 3.5 × 3.5 mm, 0.5 mm pitch, 18-lead QFN package with exposed thermal pad (pin 17 = GND). Pin numbering follows top-view bump-side layout per DS9943 Rev 4 Figure 11.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar HDMI control-stage protection and signal conditioning applications.

Compared with TPD12S016 and PTN3366, the HDMI2C1-6C1 uniquely integrates HEAC management, dynamic DDC pull-up for 750 pF loads, and self-protected 5V_OUT - delivering full HDMI 1.4 source control-stage compliance in one QFN-18 package without supplemental ICs.

Availability

HDMI2C1-6C1 is available at Aetrix Electronics and suitable for HDMI 1.4 source designs in set-top boxes, game consoles, and Blu-ray players requiring stable component supply, full CTS compliance, and long-cable robustness.

Supply support for HDMI2C1-6C1 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 automotive, industrial, and consumer ICs with strong emphasis on system-level integration and reliability.

The HDMI2C1-6C1 belongs to ST's HDMI interface protection portfolio, designed specifically to simplify HDMI 1.4 source compliance by integrating ESD hardening, signal conditioning, and power management into a single chip for consumer electronics.

FAQ

What is the minimum ASIC supply voltage supported by HDMI2C1-6C1 for DDC and CEC level shifting?

The HDMI2C1-6C1 supports VDD_IC as low as 1.62 V, with confirmed operation at 1.8 V for both DDC (SCL_IC/SDA_IC) and CEC (CEC_IC) level-shifting functions. Input thresholds scale with VDD_IC (e.g., VIH_CEC_IC = 60% of VDD_IC), ensuring compatibility with modern low-voltage HDMI transmitters without external translators.

Does HDMI2C1-6C1 require external pull-up resistors on the DDC bus?

Yes - external 1.8 kΩ pull-ups (R2/R3 per DS9943 Figure 10) are required on the cable-side SCL/SDA lines per HDMI CTS, and 10 kΩ pull-ups (R4/R5) on the ASIC-side SCL_IC/SDA_IC lines to meet I²C voltage-level requirements. The internal dynamic pull-up is active only during signal transitions and does not replace DC pull-ups.

How does the CEC wake-up function operate when VDD_5V is powered off?

When VDD_5V = 0 V but VDD_CEC = 3.3 V, the CEC block remains fully functional: CEC_IC drives the cable-side CEC line, backdrive protection isolates the ASIC, and UVLO monitors VDD_CEC. Quiescent current drops to <40 µA, enabling wake-up commands to be received and relayed to the ASIC even during full system standby.

Can HEAC+ and HEAC− be left floating if HEAC functionality is not used?

Yes - STMicroelectronics explicitly states in DS9943 that HEAC+ and HEAC− must remain unconnected (not tied to GND or VDD) when HEAC is unused. Connecting them to ground risks unintended current paths and violates the functional block diagram (Figure 7), potentially compromising HPD integrity or ESD performance.