PTN3355 is a DisplayPort to VGA adapter with an integrated 1 : 2 VGA switch optimizedprimarily for motherboard applications, to convert a DisplayPort signal from the chip set toan analog video signal that directly connects to the VGA connector. PTN3355 integrates aDisplayPort receiver, a high-speed triple video digital-to-analog converter and 1 : 2 VGAswitch that supports a wide range of display resolutions, for example, VGA to WUXGA. PTN3355 supports either one or two DisplayPort lanes operating at either2.7 Gbit/s or 1.62 Gbit/s per lane.

PTN3355 supports I2C-bus over AUX per DisplayPort standard, and bridges theVESA DDC channel to the DisplayPort Interface.

PTN3355 is powered from a 3.3 V power supply and consumes approximately 200 mW ofpower for video streaming in WUXGA resolution and 410 μW of power in Low-powermode. The VGA output is powered down when there is no valid DisplayPort source databeing transmitted. PTN3355 also aids in monitor detection by performing load sensing onRGB lines and reporting sink connection status to the source.

VESA-compliant DisplayPort converter

• Main Link: 1-lane and 2-lane modes supported:
  • HBR (High Bit Rate) at 2.7 Gbit/s per lane
  • RBR (Reduced Bit Rate) at 1.62 Gbit/s per lane
  • BER (Bit Error Rate) better than 10-9
  • DisplayPort Link down-spreading supported
• 1 MHz AUX channel:
  • Supports native AUX CH syntax
  • Supports I2C-bus over AUX CH syntax
• Active HIGH Hot Plug Detect (HPD) signal to the source

VESA-compliant eDP extensions

• Supports Alternate Scrambler Seed Reset (ASSR)
• Supports Alternate Enhanced Framing mode - Enhanced Framing

DDC channel output

• I2C-Over-AUX feature facilitates support of MCCS, DDC/CI, and DDC protocols

Analog video output

• VSIS 1.2 compliance for supported video output modes
• Analog RGB current-source outputs
• 3.3 V VSYNC and HSYNC outputs
• Pixel clock up to 240 MHz
• Triple 8-bit Digital-to-Analog Converter (DAC)
• Direct drive of double terminated 75 ? load with standard 700 mV (peak-to-peak)signals
• Integrated 1 : 2 VGA switch

General features

• Supports firmware upgradability through ‘Flash-over-AUX’ scheme for Windows
• Supports firmware upgradability through I2C-bus interface
• Monitor presence detection through load detection scheme. Connection/disconnectionreported via HPD IRQ and DPCD update
• Wide set of display resolutions are supported:
  • 1920 x 1440, 60 Hz, 18 bpp, 234 MHz pixel clock rate
  • 2048 x 1152, 60 Hz (reduced blanking), 24 bpp, 162 MHz pixel clock rate
  • 2048 x 1536, 50 Hz (reduced blanking), 24 bpp, 167.2 MHz pixel clock rate
  • WUXGA: 1920 x 1200, 60 Hz, 18 bpp, 193 MHz pixel clock rate
  • WUXGA: 1920 x 1200, 60 Hz (reduced blanking), 24 bpp, 154 MHz pixel clock rate
  • UXGA: 1600 x 1200, 60 Hz, 162 MHz pixel clock rate
  • SXGA: 1280 x 1024, 60 Hz, 108 MHz pixel clock rate
  • XGA: 1024 x 768, 60 Hz, 65 MHz pixel clock rate
  • SVGA: 800 x 600, 60 Hz, 40 MHz pixel clock rate
  • VGA: 640 x 480, 60 Hz, 25 MHz pixel clock rate
  • Any resolution and refresh rates are supported from 25 MHz up to 180 MHz pixelclock rate at 24 bpp, or up to 240 MHz pixel clock rate at 18 bpp
• Bits per color (bpc) supported:
  • 6, 8 bits supported
  • 10, 12, 16 bits supported by truncation to 8 MSBs
• All VGA colorimetry formats (RGB) supported
• Power modes:
  • Active-mode power consumption: ~200 mW at WUXGA, 1920 x 1200, 60 Hz(18 bpc)
  • 410 μW at Low-power mode
• Supports slave I2C-bus interface for host debugging and configuration
• Supports flexible choice of timing reference:
  • On-board oscillator with external crystal, ceramic resonator
  • Different frequencies supported: 25 MHz, 27 MHz, 33 MHz
• ESD protection: 7.5 kV HBM
• Single power supply (3.3 V) for easy integration in the platforms
• Commercial temperature range: 0 °C to 85 °C
• 40-pin HVQFN, 6 mm x 6 mm x 0.85 mm (nominal); 0.5 mm pitch; lead-free package

• Notebook computers, tablets and desktop PCs
  • Dongles, adapters, docking stations