【应用】单个引脚高达1600Mbps传输速率 DDR3，助力ADAS系统数据传输

时间： 2019-07-27 来源：世强作者：潇湘子

技术问答

【摘要】为保证汽车ADAS的顺利运行，系统对DDR SDRAM提出了高速高容量且低功耗的要求。ALLIANCE AS4C512M8D3L内部配有8个存储块，单片容量高达512M×8bit；I/O引脚速率达1600Mbps；相比于同等性能和负载比下的标准版DDR3内存，能够降低至少15%的功耗。

先进驾驶辅助系统（Advanced Driver Assistant System），简称ADAS，是利用安装于车上的各式各样的传感器，在第一时间收集车内外的环境数据，进行静、动态物体的辨识、侦测与追踪等技术上的处理，从而能够让驾驶者在最快的时间内察觉可能发生的危险，以引起注意和提高安全性的主动安全技术。

下图1是前后摄像头ADAS的结构框图，此系统可提供车道偏离警告（LDW）、自动车道保持辅助（LKA）、远光灯/近光灯控制和交通标志识别（TSR）等功能。系统应用中，前后摄像头把车前后的路况图片信息传递给处理器分析处理，系统自动地识别路况，并显示在LCD显示屏上。路况信息的数据量非常大，处理算法也很复杂，因此需要运算能力强大的处理器，同时外挂高速高容量的DDR SDRAM，才能让系统运行顺畅。而且为降低整体能耗，选择低功耗产品也具有重要意义。

图1：前后摄像头ADAS结构框图

Alliance Memory是全球性的专业RAM 供应商。Alliance的Memory产品整体特点是不停产、不改版、不缩Die、货期稳定。Alliance的DDR3 SDRAM在同行业中有功耗低、数据传输快等优势。

AS4C512M8D3L内存芯片内部配有8个存储块，单片容量高达512M×8bit。其通过采用双倍数据率结构来实现内存的高速，每个I/O引脚能够提供高达1600Mbps的传输速率，其自动预充电功能在每一次突发读写序列之后都会进行初始化并自动进行预充电。AS4C512M8D3L型低电压版内存芯片支持DC 1.35V压供电，相比于同等性能和负载比下的标准版DDR3内存，该款内存能够降低至少15%的功耗，相比于1.8V的DDR2内存则可降低40%左右。这对于ADAS系统来说能降低整体功耗，相对提高了产品竞争力。

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【应用】4G/1600MHz DDR3，助力高清摄像机数据高速稳定存储

Alliance的存储器AS4C256M16D3LA-12BIN。采用1.35V低电压供电的存储器（若系统是1.5V供电，可选用AS4C256M16D3-12BIN），256M x 16位数据宽度，800MHz时钟频率，封装为96-ball FBGA，工业级温度范围-40~95℃。

新应用发布时间 : 2019-07-27

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型号- AT24C16,AT24C16D

数据手册 - 英锐芯 - 2022年5月 PDF 中文下载

ATP Electronics（华腾国际）是高性能，高质量和耐用NAND闪存和DRAM存储器模块的领先解决方案提供商。25年来，一直在通过高性能和高耐用性的NAND闪存产品和DRAM内存模块来改变工业和企业计算领域。拥有先进的系统级包装（SiP）以及独特的PowerProtector、安全擦除等技术。

工业SD卡工业microSD卡 SD卡 microSD卡工业闪存卡工业CFast卡 M.2 固态模块 M.2 串行 ATA (SATA) 固态模块 2.5"SSD SSD mSATA SSD ATP eUSB模块工业级U盘 eMMC嵌入式存储器 DRAM模块

授权代理商 - 世强控股有限公司线上商城技术资料

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ALLIANCE 存储器选型表

提供存储器、存储芯片、SRAM、SDRAM、DDR1、DDR2、DDR3、DDR4选型，VCC(V)：0.6-5，MSL LEVEL：0-5，CLOCK(MHz)：133-1866，可支持商业级/工业级/汽车级。

产品型号	品类	Product Family	DENSITY	ORGANISATION	VCC(V)	TEMPERATURE RANGE(°C)	PACKAGE	MSL LEVEL
AS7C164A-15JCN	存储器	FAST-Asynch	64K Fast	8K x 8	5V	Commercial (0 ~ 70°C)	28pin SOJ(300mil)	3