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michaelfortner9
Visitor II
July 10, 2013
Solved

Help with schematic capture portion of CR95HF design...

  • July 10, 2013
  • 3 replies
  • 1992 views
Posted on July 10, 2013 at 20:28

Hello,

I am working with a local customer on a new CR95HF design and was hoping your team could provide feedback on some of the questions they submitted today related to schematic capture:

1. The RF output of CR95HF (TX1, TX2) is first connected to an EMC filter (L1, L3, C1, C4), do you have recommended component values for this EMC filter? (Note that their product will be first launched in US.)

2. Within the CR95HF demo board schematic (please see attached), it is not clear to them how the two resistors (circled in picture) are mounted. Could you provide some guidance here?

3. We noticed that CR95HF supports two VPS_TX range: 2.7V � 3.3V, 4.5V � 5.5V. What, if any are the performance tradeoffs between these two operating conditions? For example, if they drive a higher VPS_TX, will the NFC range be larger compared to a lower VPS_TX?

Thanks in advance for your help.

#schematic-capture-cr95hf
    This topic has been closed for replies.
    Best answer by Tesla DeLorean
    Posted on July 13, 2013 at 02:58

    NX2520SA, a 27.12-MHz EXS00A-CS01206 crystal oscillator for CR95HF transceiver

    http://www.st.com/st-web-ui/static/active/jp/resource/technical/document/user_manual/DM00068980.pdf

    3 replies

    M
    michaelfortner9Author
    Visitor II
    July 10, 2013
    Posted on July 11, 2013 at 01:15

    The customer came to me this afternoon with one addition question.  Essentially, on the demo board (CR95HF) schematic, it seems that the 27.12MHz crystal used is from NDK (NX2520SA). Could you help identify the detailed manufacturer part number used (As you know, the last digit of part number could affect some parameters such as ESR and load capacitance)?

    I looked on the eval board BOM and the part number on that document is identical to the schematic.

    Thanks again for the help.

    Hello,

    I am working with a local customer on a new CR95HF design and was hoping your team could provide feedback on some of the questions they submitted today related to schematic capture:

    1. The RF output of CR95HF (TX1, TX2) is first connected to an EMC filter (L1, L3, C1, C4), do you have recommended component values for this EMC filter? (Note that their product will be first launched in US.)

    2. Within the CR95HF demo board schematic (please see attached), it is not clear to them how the two resistors (circled in picture) are mounted. Could you provide some guidance here?

    3. We noticed that CR95HF supports two VPS_TX range: 2.7V – 3.3V, 4.5V – 5.5V. What, if any are the performance tradeoffs between these two operating conditions? For example, if they drive a higher VPS_TX, will the NFC range be larger compared to a lower VPS_TX?

    Thanks in advance for your help.
    T
    Tesla DeLoreanAnswer
    Graduate II
    July 13, 2013
    Posted on July 13, 2013 at 02:58

    NX2520SA, a 27.12-MHz EXS00A-CS01206 crystal oscillator for CR95HF transceiver

    http://www.st.com/st-web-ui/static/active/jp/resource/technical/document/user_manual/DM00068980.pdf

    A
    Anais GALLIGANI
    Visitor II
    July 15, 2013
    Posted on July 15, 2013 at 15:51

    Dear customer,

    Might you send us your email address please?

    Thanks a lot,

    Have a nice day,

    All the best,

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