ST STDP4028 User Manual
STDP4028
DisplayPort transmitter
Data brief
Features
■ Enhanced DisplayPort® (DP) transmitter
– DP 1.1a compliant
– Embedded DisplayPort (eDP) compliant
– 1, 2, or 4 lanes
■ Higher bandwidth “Turbo mode” (3.24 Gbps)
per lane, supports:
– 1920 x 1080 (FHD) 120 Hz/10-bit color
video standard timings and 7.1 Ch audio
– 2560 x 1600 (WQXGA), 2560 x 2048
(QSXGA) 60 Hz/10-bit color graphics and
7.1 Ch audio
■ Interface compatibility with wide range of
display controller ICs
– LVTTL (60 wide) and LVDS (quad bus)
video interface
– 8-Ch I2S and SPDIF audio interface
■ Robust AUX channel
– Link service, maintenance
– I2C-over-AUX (MCCS, DDC)
– IR, full duplex UART protocol
■ Configurable through I2C host interface
■ Supports HDCP 1.3 with on-chip keys
■ HDCP repeater capability
– Acts as downstream transmitter
■ Spread spectrum on DisplayPort, LVDS, and
TTL interfaces for EMI reduction
■ Supports deep color and color format
conversion
– RGB/YCC (4:4:4) – 10-bit color
– YCC (4:2:2/4:2:0) – 12-bit color
– RGB (4:4:4) to YCC (4:4:4) conversion and
vice-versa
■ Low power operation; 20 mW standby
■ I2C to AUX bridge for EDID, MCCS pass
through
■ Supports HBR/“Turbo” speed over HBR/RBR-
rated long cables (15 m and more)
■ Package
– 164 LFBGA (12 x 12 mm / 0.8 mm)
■ Power supply voltages
– 3.3 V I/O; 1.2 V core
Applications
■ Digital TV, docking station, STB, game
console, etc.
QLVDS/
TTL (60)
Video
I2S/SPDIF
Audio
LVDS/TTL
I2S/SPDIF
I2C Host
Interface
Receiver
Receiver
Oscillator
Crystal
DisplayPort
Transmitter
GPIO
DP Output
I2C
Master
September 2010 Doc ID 15886 Rev 1 1/7
For further information contact your local STMicroelectronics sales office.
www.st.com
7
Description STDP4028
1 Description
The STDP4028 is a DisplayPort transmitter IC for the secure transmission of highbandwidth, uncompressed digital audio-video signals targeted for applications such as DTV,
LCD monitor, docking station, and other types of display systems. STDP4028 is a VESA DP
1.1a and eDP compliant device, implementing a single link DisplayPort output port
comprising four main lanes, auxiliary channel and HPD. In addition to the standard HBR (2.7
Gbps) and RBR (1.62 Gbps) speeds, this device supports “turbo” speed of 3.24 Gbps per
lane with a total link bandwidth of 12.96 Gbps. The higher bandwidth provides unique
benefits to users over other commercial DP transmitters for embedded applications by
offering additional margin to support higher color depth, resolution, and refresh rate. For
example, STDP4028 supports FHD non-reduced blanking video (1080p 30-bit color per
pixel) at 120 Hz, plus 7.1 Ch audio in two-box TV applications. The high-speed auxiliary
channel in STDP4028 acts as a bidirectional communication link, supporting applicationspecific protocols such as MCCS, DDC, UART, IR, as well as, the dedicated DisplayPort link
training and device management functions.
The STDP4028 supports RGB and YCC video color formats with color depth of 12 (YCC
4:2:2 only), 10, and 8 bits. This device offers LVDS and LVTTL input interface configurable to
map a wide range of display controller products. The Quad LVDS interface supports video
signals up to 400 MHz pixel rate with flexible channel and lane swapping options. The 60-bit
LVTTL input ports on STDP4028 can be mapped to transfer video data either in two pixels
per clock or single pixel per clock of a chosen color depth. The STDP4028 also supports
both compressed and uncompressed audio formats. This device comprises four I2S audio
inputs, supporting up to 8 channels LPCM audio and a single wire SPDIF input for encoded
audio. The STDP4028 features HDCP 1.3 content protection scheme with an embedded key
option for secure transmission of digital audio-video content. In addition, it supports the
HDCP repeater function and, thus acts as a downstream transmitter suitable for two-box TV
and HDMI/DVI to DP converter applications.
The STDP4028 can be configured by an external host through the I2C host interface. This
IC also includes general purpose inputs/outputs that can be used for controlling system
components. The STDP4028 features a color space converter (RGB to YCC and YCC to
RGB) for flexible interface with external video processing devices.
Figure 1. System diagram
LVDSx4
TTL (60 bits)
Video/Audio
Processor
2/7 Doc ID 15886 Rev 1
I2S (8 CH)/
SPDIF
STDP4028
STDP4028
I2C for Host
Interface and
I2C-over-AUX
DisplayPort
27 MHz
crystal
STDP4028 Benefits
2 Benefits
● ST DP transmitter offers proven interoperability with commercial DP monitors
● 20% higher link bandwidth compared to other commercial DP transmitters, supports
FHD 120 Hz/10-bit non-reduced blank timing for embedded applications
● Supports both external (DP) and embedded (eDP) applications
● HDCP repeater capability, applicable for two-box TV and HDMI/DVI to DP converters
● Embedded HDCP keys
● On-chip microprocessor enables stand-alone operation for customized applications
● Flexible interface to ease system design – DP 1, 2, 4 lane configuration, LVDS/LVTTL
port, YCC/RGB color format
● Low EMI
● Low power
Doc ID 15886 Rev 1 3/7
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