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我购买了 ST25R3911B-Disco 板用于概念验证。
我需要能够从 ~50 厘米的距离读取标签以进行识别。 目前我有 ST25TA 标签,我可以从 ~3cm 读取它。 我知道我需要购买带 NFC 类型 5 的标签 ST25TV。 你能指导我如何让 ST25R3911B-Disco 远距离工作吗? 我需要买什么样的标签? 我需要更改寄存器映射中的设置以获得长距离吗? 迪斯科能提供远距离读数吗? 如果不是什么阅读器/评估板可以完成这项工作? |
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Yes i am confident that this can be achieved. Likely due to the bad coupling between reader antenna and tag antenna additional circuitry (amplifier, filter) might be required.
Internal receiver signals: You need to connect to P301 (CSO) and P302 (CSI) on the bottom side of the board. There is a footprint for UFL connectors foreseen where a UFL to BNC or SMA cable could be plugged. You can also directly solder a cable to the pads. To capture a good signal, i recommend to remove / cut the traces leading to the capacitive patches (they could pick up some field). You should then use a high impedance probe to feed the signals into the oscilloscope. Referring to chapter "1.2.15 Test access" of the datasheet DS11793 - Rev 5: By setting the registers as described in this section, you can e.g. output the analog signal of the AM channel and see how the digitizer decodes it. several other combinations are possible as mentioned in Table 13. Below you can see a Type A response showing: Yellow: H-Field Blue: Analog output of AM channel (before digitizer) Green: Digital output of AM channel (after digitizer) he screenshot shows a quite strong signal. After the first sub carrier pulses the AGC reduced the signal to a optimum level. You can now alter filter and gain settings and instantly see their impact. |
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