[问答]

CR95HF校准问题

1147 CR95HF

问答对人有帮助，内容完整，我也想知道答案 0 嗨，我有两个用于CR95HF校准的应用程序和一个用于Tag检测的应用程序。在运行标签检测应用程序之前，完成校准并将获得的DAC参考值保存在文件中。标签检测应用程序使用DAC ref值并将CR95HF设备置于IDLE模式，并将唤醒事件配置为标签检测。当TAG放置在邻近区域时，设备唤醒并且应用程序读取UID。大多数时候一切都很好。但有时，即使TAG放置在附近区域，设备也不会从IDLE模式唤醒。在一些电路板复位后，它可能会工作一段时间。我无法找到这个问题，因为它不会经常出现。但问题是重复的问题。我观察到的一件事是，我在连接天线并且没有连接天线的同一块电路板上获得不同的DAC Ref值。比如说0x03和0x07。天线在校准过程中的作用是什么？此外，当Tag检测应用程序失败时，我已经看到获得的DAC Ref值是没有天线的值，即0x03。当Tag检测成功时，获得的Ref值为0x07。请帮我找到问题。提前致谢 Geethu ＃cr95hf #dac #idle 以上来自于谷歌翻译以下为原文 Hi, I have two applications one for the Calibration of CR95HF and one for Tag detection. Before running the Tag detection application Calibration is done and the DAC ref value obtained is saved in a file. The Tag detection application uses the DAC ref value and puts the CR95HF device into IDLE mode with the wakeup event configured as Tag Detection. When a TAG is placed in the proximity area, device wakes up and the application reads the UID. Most of the time everything is working fine. But sometimes, the device is not waking up from IDLE mode, even if TAG is placed in the vicinity area. It may work after some time after some board resets and all. I couldnt find the issue as its not coming regularly. But the issue is a repeating one. One thing I observed is I am getting different DAC Ref value for the same board with antenna connected and without antenna connected. say 0x03 and 0x07. What is the part that antenna does during the calibration procedure.? Also when the Tag detetion application fails, I have seen that the DAC Ref value obtained is the value without antenna, ie 0x03. And When the Tag detection is successful, the Ref value obtained is 0x07. Please help me in finding the issue. Thanks in advance Geethu #cr95hf #dac #idle 0
2019-7-30 07:30:35　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × wang21cj 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 41 个回答。邀请回答 chm5 该类别下有 39 个回答。邀请回答 hgimtk 该类别下有 33 个回答。邀请回答 HengDu 该类别下有 30 个回答。邀请回答 hwp0415229 该类别下有 28 个回答。邀请回答 jghgfdssas 该类别下有 28 个回答。邀请回答可口可甜该类别下有 26 个回答。邀请回答 kingnet6688 该类别下有 26 个回答。邀请回答颜刚YanG 该类别下有 26 个回答。邀请回答 zyh34997 该类别下有 25 个回答。邀请回答柱子图宁该类别下有 25 个回答。邀请回答 jenny042 该类别下有 25 个回答。邀请回答 kingnet9999 该类别下有 25 个回答。邀请回答 andyfly7 该类别下有 25 个回答。邀请回答麻酱该类别下有 25 个回答。邀请回答成长的小师弟该类别下有 24 个回答。邀请回答 gXDhn 该类别下有 24 个回答。邀请回答 jiangwenwen 该类别下有 24 个回答。邀请回答哼小曲该类别下有 24 个回答。邀请回答举报丁冬芹相关推荐 • CR95HF具有哪些特性参数应用？ 1776 • 如何使用CR95HF模拟NDEF？ 320 • 哪里可以找到CR95HF启动序列 922 • 用CR95HF与Android系统终端能建立点对点通信吗？ 1459 • ST25DV可以替换MB1054B CR95HF吗？ 341 • CR95HF不响应任何命令 1319 • 请问哪里可以下载CR95HF和STM8L-Discovery板固件？ 1307 • 如何解决帮助CR95HF设计的原理图捕获的部分问题？ 819 • 有哪位大神可以分享CR95HF的PCB指南吗？ 232 • CR95HF怎么读取多个寄存器 922 1个回答

答案对人有帮助，有参考价值 0 嗨，关于Dac（参见DS的5.6.5部分），用户可以保留这些DacData L和DacDataH值，或者在更改IDLE参数中更改它们。如果DacData L和DacDataH之间的差异被消除，则标签检测范围增加。缺点是CR95HF可以从标签检测模式唤醒而在RF场中没有标签。 DacData L和DacDataH值之间的差异的选择是标签检测范围和标签检测的可靠性之间的折衷。这是用户的选择。 CR95HF的最低功耗是休眠状态。在标签检测状态中，您可以通过增加WU周期值来减少电流消耗。 WU周期值增加了两次RF突发之间的时间。 AN3433详细介绍了标签检测模式。您可以在上找到更多信息 http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00025644.pdf （ http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00025644.pdf ）和 http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00034250.pdf （ http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00034250.pdf ）我希望这有帮助，祝你今天愉快， ST NFC / RFID动态标签支持以上来自于谷歌翻译以下为原文 Hi, Concerning the Dac , (see part 5.6.5 of the DS) the user can keep these DacData L and DacDataH values or change them in the change IDLE parameters. If the difference between DacData L and DacDataH is decrased , the tag detection range is increased. The cons point is that the CR95HF can wake up from the tag detection mode without a tag in the RF field. The choice of the difference between DacData L and DacDataH values is a trade off between the tag detection range and the reliability of the tag detection. This a user choice. The lowest power consumption of the CR95HF is the hibernate state. In the tag detection state you can decrease the current consumption by increasing the WU period value. The WU period value increases the time between two RF bursts. The AN3433 details the tag detection mode. You can find more information on the http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00025644.pdf ( http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/DM00025644.pdf ) and http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00034250.pdf ( http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/DM00034250.pdf ) I hope this is helping, Have a nice day, ST NFC /RFID Dynamic tag support

2019-7-30 07:37:49 评论举报陈秀英