The ADAS system is built by combining equipment with different sensing methods and sensing distances such as Lidar, sonar, and cameras, and the car camera plays an important role in eliminating the nearby blind spots. The latest car is equipped with approximately 10 cameras, this undoubtedly gives a higher request to the camera.

due tobatteryThe supply of power and the installation camera are limited, in the vehicle camera module, further reductionCircuit boardThe demand for dimensions and reduced power consumption is increasing. Here,Roma(RoHM) recently developed a very suitable Serdes IC "BU18XMXX-C" and the camera for the car modulePMIC "BD86852MUF-C". These issues are solved by combining new products with PMICs with the SERDES IC and the camera.

Mr. Li Chunhua, deputy general manager of Romhem Semiconductor (Shanghai) Co., Ltd., said, "Serdes IC is called serial subsequators. A function of serializer is to convert the original parallel signal to the serial signal required for high-speed transmission. The deserializer in the rear end is the parallel signal required to convert the serial signal into the SOC of the backend ECU, so the SerDES IC (serial deserializer) is a sanctuary to organize the parallel signal and convert it to a string The IC of the line signal. "

Product 1: Serdes IC "BU18XMXX-C" Features

Serdes IC "Bu18XMXX-C" used to transmit images can optimize the transmission rate based on resolution, so power consumption can be reduced by 27% compared to ordinary products. In addition, the EMI peak can be reduced by about 20 dB by transmitting rate optimization functions and extension functions. Not only that, the IC also has a frozen detection function that can detect the freezing state of the image, thereby improving the reliability of the entire ADAS system.

Features 1. Optimize the transmission rate, help to reduce the power consumption of the vehicle camera module

Ordinary Serdes ICs set a fixed transfer rate for each band. However, since this method cannot be set to more finely, the power loss is generated. "BU18XMXX-C" is equipped with a function of optimizing transmission rates based on resolution rather than frequency bands. Since it is possible to make a more fine transmission rate setting than ordinary products, the work efficiency is higher, which helps further reduce the power consumption of the vehicle camera module.

Features 2. Built-in transmission rate optimization functions and extension functions to help reduce EMI countermeasures design workers

Using the above-described transmission rate optimization function, this product is subjected to the transmission rate of each path, dispersed the EMI peak, and reduces EMI to about 10 dB. In addition, by equipped with the extension function in both ICs of the serializer and the deserializer, the EMI can also reduce the 10 dB.

Features 3. Equipped with freezing detection, help improve reliability

This product is also equipped with a function of detecting image freezing state. In addition to comparing from CMOSImage SensorTo the deserializerMiPi The CRC value confirms whether the image is accurately transmitted, and can also be compared by always comparing the data frame CRC value of the camera image in the serializer.monitorImage freeze problem. If the data frame CRC value continues to consistent, the IC can be notified by outputting the error flag, which will help improve the reliability of the ADAS system.

Features 4. Complete product lineup, support various CMOS image sensors and SOC

This product has 3 product models, including a serializer and two demobilizer products. Since three products support three major communicationcableTherefore, various CMOS image sensors and SOCs can be supported.

Product 2: Features of PMIC "BD86852MUF-C" for the camera

PMIC for the cameraPower managementIC) "BD86852MUF-C" can provide better management functions for power systems of the main manufacturer's CMOS image sensor. Since voltage settings and timing control can be performed only through a single IC, the mounting area can be reduced by about 41%, thereby helping the vehicle camera module miniaturization. In addition, due toCircuitThe structure can be dispersed in the heat of the camera on the PMIC, thus achieving 78.6% high conversion efficiency by suppressing heat generation, which helps further reduce power consumption.

Features 1. Optimize the function for the CMOS image sensor, the board area is smaller

The CMOS image sensor is the main device of the car camera. The manufacturer is different, and its drive voltage setting and timing control are also different, and many external components are required. "BD86852MUF-C" is equipped with a pin that can be used for driving voltages and timing-controlled pins of primary CMOS image sensors, thereby eliminating external components for driving voltage settings and timing control. Therefore, the number of components and installation area is significantly reduced compared to previous products, which will help the small-scale in the vehicle camera module.

Features 2. High conversion efficiency, help to reduce power consumption

This product is outsideLDO Powering to the CMOS image sensor so that the heat concentrated in the IC can be dispersed. By suppressing the heat of the entire circuit, the conversion efficiency of up to 78.6% is achieved, which is more than 4% higher than the ordinary product, which helps further reduce the power consumption of the vehicle camera module. Further, the distance between the CMOS image sensor and the LDO can be shortened, thereby reducing the interference noise of the power supply line, and is stabilizing the CMOS image sensor.

Features 3. Have spread frequency, help to reduce EMI countermeasures

Features 4. Built-in power systems that are very suitable for camera modules, ensuring high reliability

This product has a built-in DC / DC converter as a power supply system required to camera modules. In addition, this product is also equipped with various protection functions, in addition to the timing control functions of the number of external components, there are also many functions such as monitoring voltage state, which can implement camera modules while ensuring high reliability. Low EMI and high efficiency power circuit.

summary:A trend in the development trend of the car camera module is a high-resolution development. Now we may see the mainstream seen in the market is 1 million lounge. Rear view, then we can also see a higher resolution of a camera, there is a domestic EV new forces, released 11 An 8 million HD camera module configuration, and a high-definition camera module is a development direction.