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Serial interface decoder targets tiny cameras

Posted: 20 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:STMicroelectronics? ST? video de-serializer? decoder? MIPI?

STMicroelectronics (ST) has introduced the first video de-serializer interface for use with MIPI CSI-1 and SMIA CCP2 class 0 serial interfaces. The CSI-1 interface is part of the Mobile Industry Processor Interface (MIPI) standard and CCP2 class 0 is part of the Standard Mobile Imaging Architecture (SMIA), the open standard for miniature camera modules.

The new interface IC, called the STCCP27A, connects a mobile phone's camera module with its multimedia or baseband processor. Specifically, the device allows multimedia processors that have a legacy parallel interface to take advantage of the range of new attractive SMIA-compliant camera modules, which provide an output via the CCP serial interface, explained ST.

The device converts the serial data stream from a mobile phone's camera into parallel data for its baseband processor. In addition, the device provides the necessary level shifting for the bidirectional I2C control lines, allowing the connection of 2.8V and 1.8V I2C busses without the need for external components.

The lowVage high-speed serial interface decoder is capable of streaming full-resolution image data up to 416Mbps, ST said. It consists of Sub-LVDS receivers accepting serial data from the camera sensor, coupled with a shift-register-based internal decoder, which converts the pixel information to parallel data for the standard bus.

According to ST, the CSI-1 and CCP2 class 0 high-speed serial video interface have only four wires and can be engineered to minimize EMI, enabling camera and receiver placement even close to radio areas. In clamshell mobile phone designs in particular, the new chip links the camera to the processor with the minimum number of wires across the hinge, while minimizing noise generation caused by data moving through the parallel bus.

The device facilitates the straightforward integration of these serial interfaces into a mobile application and can lead to system cost savings as EMI safeguards and flex circuit designs are simplified, ST said. Low pin count and the 3-by-3mm micro-TFBGA25 package comply with mobile-phone design constraints; power consumption in standby mode is only 10A maximum, leading to improved phone battery life, the company added.

ST said it also plans to introduce a higher-frequency SMIA CCP2 Class 2 de-serializer interface covering up to a 650Mbps data rate. Using configurable clock/strobe de-codification, it will cover all published SMIA classes, including 208Mbps (CSI-1 / CCP2 Class 0) supported by the STCCP27A, the 416Mbps (CCP2 Class 1) and 650Mbps (CCP2 Class 2).

Both devices are manufactured using ST's advanced sub-micron technology, the company said, which minimizes static and dynamic power consumption and is ideal for portable applications such as high-end mobile phones, PDAs, tablet PC, and other portable terminals.

Product is available in final sample form in RoHS-compliant Pb-free micro-TFBGA25 package needing just 9mm of printed wiring board area. Available now in volume production, the STCCP27A is priced at $1 each in quantities of 1,000 pieces.

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