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  • Automotive 1.3Mpx Camera Module

  • Created: Aug 13, 2017

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Summary

Car accidents are the most common events that happens in the streets, and who to blame is the hardest part to prove. Mostly, to address this problem, drivers or private car owners put dashboard cameras or also known as “dash-cam” or rear cameras to record road activities. The reference design is a very small solution size for a 1.3Megapixel automotive camera. The DS90UB913A-Q1, which is the main component, is a chipset that offers an FPD-Link III interface with a high-speed forward channel and a bidirectional control channel for data transmission over a single coaxial cable or differential pair. The design uses OV10640 imager with a high dynamic range (HDR) and supports images with 1280x1080 resolution, VGA, QVGA and any cropped size. The TPS62170-Q1, which is a synchronous step-down DC-DC converter, which optimized for applications with high power density. This design also uses TLV70215/18-Q1, a low-dropout (LDO) linear regulator that has a low quiescent current, excellent line and load transient performance.


To start the circuit functionality, a combined signal containing the DC power and the FPD-Link front and back channels enters the board through the FAKRA coaxial connector. Thus, the DC portion is connected to the input of the adjustable buck converter TPS62170-Q1. To provide the power rails that is needed by the serializer and the imager, the TLV70215/18-Q1 cater both 1.5v and 1.8V output. The high frequency portion of the signal is connected directly to the DS90UB913A-Q1. This is the path where the video data and control backchannel will take between the serializer and deserializer. The output of the imager, a 10-bit or 12-bit video data (with 2 sync signals) is connected via digital video port to the serializer and converted to a single high-speed serial stream and that is transmitted over a single coax cable to the deserializer. On the same coaxial cable, there is a separate low latency bidirectional control channel that transmits control data from I2C port that is being use by the system MCU to configure and control the imager.


The reference design can also be applied to advanced driver assistance systems (ADAS) and surround view systems



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