The National Highway Traffic Safety Administration (NHTSA) has developed new automotive safety regulations that require rear-end video cameras and displays to be standard on all cars in 2014. Reversing accidents cause hundreds of deaths and thousands of injuries every year. The regulation aims to reduce the number of casualties. This will undoubtedly improve safety and enhance the driving experience, but the addition of all these cameras will also bring new challenges to automotive system designers.
Link to transmit high speed video
A dedicated high speed video link connects each display or camera in the car to the control (head end) unit. The easiest is to use a single coaxial cable to display the NTSC (CVBS) signal from the rear camera on the center console's screen. However, the current trend is clearly to use megapixel digital cameras to improve the picture clarity and quality displayed on high-resolution LCD panels.
The high-speed serial digital link connects the video components to provide a seamless connection between the camera's digital imager and the digital LCD display. The most common and reliable high-speed digital interface technology deployed in automotive video links is based on the ANSI/TIA/EIA-644-A Low Voltage Differential Signaling (LVDS) standard. LVDS provides a robust data transmission standard that supports long range, low power, high noise rejection and low EMI . LVDS implements the required link properties in a differential manner (rather than a single-ended signal referenced by ground).
Reduce the cost of interconnection by deploying smaller connectors and cables to reduce system size and weight (two important features in automotive applications). As shown in Figure 1, the serializer receives data from a video source (such as a camera image sensor) and then converts the RGB color parallel bus signals and control signals into LVDS serialized data streams for single twisted pair alignment. Cable transmission. The companion deserializer at the other end of the cable extends the video signal back to the parallel interface, which is connected to the display or host.
Texas Instruments' FPD-Link III Serial Serializer product line offers advanced features that address the challenges of high-speed system design. A single serial data stream transmitted over a single differential pair avoids data delay differences. These devices encode serial data to include embedded clocks that can be recovered without a reference clock, allowing fast initialization of connections without special training sequences. Carefully randomized and descrambled video data not only minimizes electromagnetic interference (EMI), but also DC balance, helping to transmit and recover signals over twisted pairs or single coaxial lines over 10 meters long .
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