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我有一个非常旧的电路使用UL634 H256 NVSRAM的,已经铺设使用硬件商店,并为VCAP有一个68 UF电容器。如果ISTART使用断电信号的软件商店IAM导致EDATA的损坏。 如果IVONTER VCAP线路,它永远不会从3.3伏电源断开,所以迅速下降。芯片没有时间完成。参阅范围图。粉红色的痕迹落在商店的起点。蓝色是供应,绿色是Vcap 这是正确的,如果要执行硬件存储,或者每次VCC低于VSWOT,VCAP只与电源断开连接? 我已经在一些电路板上测试过,有些电路板坏了,但是有些信号并不是所有的信号都是相同的。想想为什么有些人可以。 柯林 964失效NV存储器1.BMP 301.1 K 以上来自于百度翻译 以下为原文 Hi I have a very old circuit using UL634H256 nvSRAM's that has been laid out to use the hardware store and has a 68uf capacitor for Vcap. If I start a software store using a power fail signal I am getting corruption of the EEdata. If I monitor the Vcap line it never gets disconnected from the 3.3 volt supply so drops quickly. The chip does not get the time to complete. See scope plot. The pink trace falls at the start of the store. Blue is supply and green is Vcap Is this correct that Vcap only gets disconnected from the supply if a hardware store is going to be performed or every time Vcc drops below Vswitch? I have tested this on a few boards and some corrupt and some do not but all the signal timings look identical. Any thoughts on why some could be ok. Colin
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嗨,柯林,
在传统部件中已经看到,如果在正在进行的商店(软件或硬件商店)中电源失效,则VCAP充电电路不会从VCC断开,从而跟踪VCC。这将导致VCAP放电,因此,在不完整的存储。这就是你所看到的。因此,您应该允许设备执行AutoSt店,而不是基于电源故障检测来启动存储。 或者,您可以切换到CyPress NVSRAM在130nm技术正在生产中。256KB部分,CY14B256LA是引脚与遗留部分兼容。 在这些部件中,正在进行的商店将从VCC供电,如果电源故障,从VCAP -当VccClinux低于VSwitter,VCAP从VCC断开,并为正在进行的商店完成存储电路供电。 从旧技术部件转换为CY14B256LA时,请参阅APP注释AN56662 问候Ravi 以上来自于百度翻译 以下为原文 Hi Colin, It has been seen in the legacy parts that if power fails during an ongoing store (software or hardware store) the VCAP charging circuit does not get disconnected from VCC and thus tracks VCC. This would result in VCAP getting discharged and consequently, in incomplete store. This is what you are seeing. Hence, you should allow the device to perform autostore instead of initiating a store based on power fail detect. Alternatively, you can change over to the Cypress nvSRAMs in 130nm technology which are in production. The 256Kb part, CY14B256LA is pin compatible with the legacy part. In these parts, an ongoing store will be powered from VCC and if power fails, from VCAP - when VCC crosses below VSWITCH, VCAP gets disconnected from VCC and powers the store circuit for completion of the ongoing store. Please refer to App note AN55662 when converting from old technology parts to CY14B256LA Regards Ravi |
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