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我的工具箱没有安装24兆赫的水晶。这是有原因的吗?我可以自己安装一个水晶,还是有一个振荡器勘误表? 以上来自于百度翻译 以下为原文 Hello, My kit did not come with the 24 MHz crystal installed. Is there a reason that this is the case? Can I install a crystal myself, or is there an oscillator errata? |
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7个回答
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是的,在ES1中有启动问题。这是记录在勘误表中的。
这就是勘误表的内容: 当Vdda低于2.0V时,MHz外部晶体振荡器电压ω问题定义为用于驱动外部MHz晶体的MHz外部晶体振荡器(MHC-ECO)不起作用。参数影响纳秒触发条件(S)VDDA和LT;2.0V具有外部晶体振荡器使能。这一问题导致的MHZ振荡器仅作用于VDDA & Gt;2.0V。如果可能的话,在VDDA上运行2.0V。A)直接将VDDA电源增加到2.0V.B),使用感应升压泵将VDDA电源增加到超过2.0V。2。如果在2.0V以下的VDDA中需要MHz的晶体精度,则外部晶体和振荡器可用于通过PSoC Creator的数字时钟源将数字时钟路由到设备。三。使用IMO(如果需要的话,PLL),精度为1%。固定状态硅修订版可在ES2中使用。 当做, DASG 以上来自于百度翻译 以下为原文 Yes, there was start-up issue observed in ES1. This is documented in the errata. This is what the errata reads: "MHz External Crystal Oscillator Voltage ■ PROBLEM DEFINITION The MHz External Crystal Oscillator (MHz ECO) used to drive an external MHz crystal does not function when Vdda is below 2.0V. ■ PARAMETERS AFFECTED NA ■ TRIGGER CONDITION(S) Vdda < 2.0V with External Crystal Oscillator enabled. ■ SCOPE OF IMPACT This issue results in the MHz oscillator only functioning for Vdda > 2.0V. ■ WORKAROUND 1. If possible run the device at Vdda ≥ 2.0V. a) Directly increase the Vdda supply to ≥ 2.0V. b) Use the Inductive Boost Pump to increase the Vdda supply to ≥ 2.0V. 2. If MHz crystal accuracy is required with Vdda below 2.0V an external crystal and oscillator can be used to route a digital clock into the device through the Digital Clock Source in PSoC Creator. 3. Use the IMO (and PLL if required) with 1% accuracy. ■ FIX STATUS Silicon revision fix available in ES2." Regards, dasg |
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从这里我了解到,只要我工作在3.3V或5.5V,外部振荡器应该是好的。
塞浦路斯建议从另一种方法(如外部数字信号)添加晶体或时钟吗? 以上来自于百度翻译 以下为原文 From what I understand here, as long as I am operating at 3.3V or 5.5V, the external oscillator should be okay. Does Cypress suggest adding a crystal, or clocking from another method (such as an external digital signal)? |
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嗨,狄噢德丹,
有什么特殊的理由坚持使用外部晶体振荡器或外部数字信号来计时吗? 如果不需要极高的精度,那么IMO和PLL的组合可以用来产生总线时钟的时钟。 IMO可以设置为3MHz,PLL设置为所需频率(例如24MHz)。 如果使用晶体是不可避免的,那么可以使用外部晶体(因为你在2V以上的操作)。 当做, DASG 以上来自于百度翻译 以下为原文 Hi Diode Dan, Is there any specific reason for insisting on the use of external crystal oscillator or external digital signal for clocking? If extremely high precision is not required, then combination of IMO and PLL can be used to generate clock for Bus Clock. IMO can be set to 3MHz and PLL set to the required frequency (say 24MHz). If use of Crystal is inevitable, then external crystal can be used (as you are operating above 2V). Regards, dasg |
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狄噢德丹
我刚读了P5勘误想出不同的东西。不知道为什么这个信息与DASG的信息冲突。从今天的外观来看,DOC是Rev“H”。这个医生说,有可能是一个问题的时候vdaa大于1.8V。现在,我从12MHz外部振荡器运行,这是好的。记住关闭输入引脚上的同步。否则,请看应用笔记。凯利克 CY8C55系列勘误表硅修订版ES1 问题定义 MHz振荡器包含一个设计缺陷,使其在数据表规格功能 VDDA大于1.8 V.这个弱点是不能立即出现在新设备。问题体现 过了一段时间从几个月到几年。故障的准确时间随设备而异。 设备。 触发条件(S) VDDA大于1.8 V时,生态兆赫振荡器是启用 以上来自于百度翻译 以下为原文 Diode Dan, I was just reading the P5 errata and came up with something different. Not sure why this info is conflicting with dasg's info. The doc is at Rev "H" from today's look. This doc says that there is a possible issue when VDAA is GREATER than 1.8V. For now, I am running from a 12MHz external oscillator, which is working well. Remember to turn-off sync on the input pin. Otherwise, see the app note. KellyC CY8C55 Family Errata Silicon Revision ES1 ■ PROBLEM DEFINITION The MHz oscillator contains a design weakness that causes it to function outside datasheet specifications if VDDA is greater than 1.8 V. This weakness is not immediately present on new devices. The issue manifests over a period of time ranging from a few months to several years. The exact time to failure varies from device to device. ■ TRIGGER CONDITION(S) VDDA greater then 1.8 V when the ECO MHz oscillator is enabled |
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实际上,再看一遍,这个勘误表可以应用于内部振荡器。干杯,Kelly C.
以上来自于百度翻译 以下为原文 Actually in looking at this again, this errata may apply to the internal oscillator. Cheers, Kelly C. |
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您好,
您指出的勘误适用于与外部晶体一起使用的MHz振荡器。 然而,如勘误表中提到的,这种弱点在新设备中是不可见的。它可以在数月/年的老化中可见。 这从设备到设备各不相同。 很高兴听到你正在使用12MHz外部科瑞斯特尔并让它工作。 当做, DASG 以上来自于百度翻译 以下为原文 Hi dspGuru, The errata which you have pointed out is applicable to MHz oscillator which is used in conjunction with the external Crystal. However, as mentioned in the errata this weakness is not visible in new devices. It may be visible with ageing in months / years. This varies from device to device. It is good to hear that you are using 12MHz external Crystal and got it working. Regards, dasg |
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