Diodes Incorporated


PI3AUX221 is an interface chip between the discrete Graphics Processing Unit (GPU) and the Display Port (DP) connector. The device is ideal for applications that require support of Dual-Mode Display Port. It integrates the support function for Display Data Channel (DDC) in HDMI mode and includes the functions of level translation, mux function, over-voltage protection, backdrive protection and inversion of Hot Plug Detect (HPD). The level translation function allows a wide range of voltage between 1V to 5V. The device eliminates the requirement of many discrete components, and it is available in a space-saving 12-pin ultrathin 0.65mm high 2x2 mm QFN package.


  • AC-coupling of AUX signal or DC-level translated Display Data Channel (DDC) signal controlled by the SEL pin
  • Bi-directional level translation of 100KHz DDC signals
  • Inverted level translation of HPD signal from DisplayPort Connector to GPU
  • Protection function to prevent signal propagation across AUX1 and AUX2A/B when either VREF1 or VREF2 voltage is invalid
  • Protection function to prevent signal propagation from HPD2 to HPD1 when VREF1 is invalid
  • Protection on AUX1 from over-voltage condition of AUX2A and AUX2B
  • Leakage current between VREF1 and VREF2 limited to 100nA 0MHz, -3dB Bandwidth for AUX switches
  • Complies with DisplayPort 2.0
  • Complies with HDMI 2.1
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
  • Packaging (Pb-free & Green):
    • 12-Pin UQFN 2x2mm


  • Dual Mode Display Port in graphics cards

Product Specifications

Product Parameters

Analog or Digital? Analog
Configuration SPDT
Differential Channels 1 Differential Channel 1:1
HotInsertion 0
Lanes 1
Signal Type Differential
Voltage 3.3 and 1.8
Ambient or Junction Temperature (°C) -40 to 85

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Additional Technical Documents are available upon request: 
Application information, Evaluation board, and Other technical documents

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