ST STDP3100 VGA信号格式转换方案

ST公司的STDP3100是DisplayPort到VGA的信号格式转换器,具有DisplayPort接收器,视频DAC,时钟形成发生器,测试图发生器以及吸检测区块.此外还包括EDID和MCCS直通特性,以便在PC和显示器形成全透明的操作.162 MSPS 吞吐量.主要用在新一带基于DisplayPort的PC和笔记本电脑与通常的VGA显示器间接口.本文介绍了STDP3100的主要特性和优势,方框图以及STDP3100系统框图.

STDP3100 DisplayPort to VGA converter
STDP3100 is a DisplayPort to VGA signal format converter for interfacing next generation
DisplayPort based PC and notebook computers with conventional VGA displays, such as
CRT, LCD monitors, and projectors. DisplayPort offers a unified, scalable, and cost effective interface for embedded and external display applications. As desktop and notebook PCs are increasingly transitioning from conventional analog type interfaces to DisplayPort, STDP3100 facilitates the transition by offering seamless connectivity between new DisplayPort PC and notebooks and the installed base VGA monitors and projectors.
STDP3100 is a highly integrated converter featuring a DisplayPort receiver, video DAC,
clock form generator, test pattern generator, and sink detection block. In addition,

STDP3100 includes EDID and MCCS pass-through features, forming a fully transparent
operation between the PC and display. Active power consumption of this device is as low as 400mW, and thus it can be powered by the DisplayPort source when used in dongle
application. The device has a built in sink detection feature that determines the active and
standby state. The device enters into standby (low power) state whenever the VGA cable is disconnected and returns to normal operation when the cable is connected back.
STDP3100 supports video resolutions from VGA through WUXGA. The input DisplayPort
interface consists of two main lanes, AUX channel, and HPD signal that maps directly to a
standard DisplayPort connector via two layers PCB. The output interface consists of analog R, G, B video, Hsync, Vsync, and DDC signals. Analog video signal amplitude ranges from 0 to 700mV from a 10 bit video DAC with maximum sampling frequency of 162 MHz. The VGA output signal interface conforms to the VSIS standards with separate Hsync and Vsync control signals. The DDC_SDA and DDC_CLK signals are driven from an I2C master, which controls I2C traffic between the DisplayPort AUX channel and external slave device.

STDP3100主要特性:
■Two lane DisplayPort 1.1a receiver
■Triple 10-bit video DAC
–162 MSPS throughput rate
–VSIS compatible
–RGB output with 0 to 700mV range
■3.3V HSYNC, VSYNC
■Resolution through WUXGA
■EDID, MCCS pass-through support
■3.3V DDC output signals
■Sink detection logic
■Low power operation – Active 400mW, standby mode 15mW
■Package: 64-pin LQFP, 10 x 10 mm
STDP3100优势:
●Production-proven DisplayPort receiver from the DisplayPort leader
●Comprehensive feature set for DisplayPort to VGA dongle and for notebook embedded application
●Proven interoperability with DisplayPort sources from all major graphics vendors
●Cost savings due to optimized BOM, low power, low EMI, and small form factor
●DisplayPort CTS compliant
STDP3100应用:
■DisplayPort to VGA dongle as an attachment to Notebook and Desktop PCs
■DisplayPort to VGA conversion for Notebook and Desktop PC motherboard applications



图1. STDP3100方框图



图2.STDP3100系统框图