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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 (see Table 9). 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 (Ref. 1), 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 ?W 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.

2.1 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

2.2 VESA-compliant eDP extensions

? Supports Alternate Scrambler Seed Reset (ASSR)

? Supports Alternate Enhanced Framing mode - Enhanced Framing