Low Power DisplayPort to VGA Adapter with Integrated 1-2 VGA Switch

Overview

PTN3355 is a DisplayPort to VGA adapter with an integrated 1 : 2 VGA switch optimized primarily for motherboard applications, to convert a DisplayPort signal from the chip set to an analog video signal that directly connects to the VGA connector. PTN3355 integrates a DisplayPort receiver, a high-speed triple video digital-to-analog converter and 1 : 2 VGA switch that supports a wide range of display resolutions, for example, VGA to WUXGA. PTN3355 supports either one or two DisplayPort lanes operating at either 2.7 Gbit/s or 1.62 Gbit/s per lane.

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

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

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Features

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/disconnection reported 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 pixel clock 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 target 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

Target Applications

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