如何解释IC上的日期代码或fab代码？

我们注意到最近L6390D电机驱动器威廉希尔官方网站 的运行已经改变，该威廉希尔官方网站 已经使用了3 - 4年。我看到数据表在2012年7月更新了VBO_thON和VBO_thOFF以及其他参数。任何人都可以告诉我：1）该IC自其原始设计以来发生了哪些变化？ 2）所有与此IC相关的PCN（我在网上找不到它们）是什么？3）如何解释IC上的日期代码或fab代码？ （例如，“91H3102”在IC pkg的第二行是什么意思？）

＃l6390-PCN-vbo_thon-vbo_thoff



以下为原文




We have noticed a recent change in the operation of our L6390D motor driver circuit that has been in use for 3-4 years.  I see that the data sheet was updated in July 2012 with respect to VBO_thON and VBO_thOFF as well as other parameters. Can anyone tell me: 1) what has changed in this IC since its original design? 2) What are all of the PCNs that pertain to this IC (I can't find them on the web) 3) How do I interpret the date code or fab code on the ICs?  (for example, what does ''91H3102'' mean on the 2nd line of the IC pkg?)
  
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